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Ordering number : ENN8085
SANYO Semiconductors
DATA SHEET
LA1776M
Overview Functions
* * * * * * * FM front end FM IF Noise canceller Multiplex AM up-conversion FM/AM switch MRC
Monolithic Linear IC
Single-Chip Tuner IC for Car Radios
The LA1776M integrates all six blocks required in a car radio tuner on a single chip.
Feature
* * * * * * * * * * * * Reduced noise in the mixer and amplifier blocks for improved performance Increased FM front end mixer dynamic range for improved three signal characteristics Improved AM practical sensitivity and saturated signal-to-noise ratio S-meter sample-to-sample variations can be improved by using the FM S-meter shift function (Fixed resistors can be used for the SD, keyed AGC, muting on adjustment, muting attenuation, SNC, and HCC.) High-speed searching can be implemented using the FM band mute time constant switching function. Superb listenability provided by improved medium and weak field noise canceller characteristics. Improved separation temperature dependency characteristics Excellent FM S-meter voltage linearity Noise rejection improved by modifications to the NC circuit Sample-to-sample variation correction circuit (zapping) in the FM IF circuit Stopping at stations with heavy interference is prevented by increasing the AM wide AGC sensitivity by 10 dB during seek operations Built-in anti-birdie filter
Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
40706 MS OT B8-7756 No.8085-1/41
LA1776M
Specifications
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC1 max VCC2 max Pd max Topr Tstg Pins 5, 40, and 61 Pins 9, 46, 54, 59, and 60 Ta 85C Conditions Ratings 9 12 950 -40 to +85 -40 to +150 Unit V V mW C C
Recommended Operating Conditions at Ta = 25C
Parameter Maximum Recommended supply voltage Operating supply voltage range Symbol VCC VCCST IND VCC op Conditions Pins 5, 9, 40, 46, 54, 59, 60, and 61 Pin 39 Ratings 8 5 7.5 to 8.5 Unit V V V
Function List FM Front End (Equivalent to the Sanyo LA1193) * Double input type double balanced mixer, base injection * Pin diode drive AGC output * MOSFET second gate drive AGC output * Keyed AGC adjustment pin * Differential IF amplifier * Wide band AGC sensitivity setting pin, and narrow band AGC sensitivity setting pin FM IF * IF limiter amplifier * S-meter output (also used for AM) 6-stage pickup * Multipath detection pin (shared FM signal meter) * Quadrature detection * AF preamplifier * AGC output * Band muting * Soft muting adjustment pin * Muting attenuation adjustment pin * IF counter buffer output (also used for AM) * SD (IF counter buffer on level) adjustment pin * SD output (active high) (also used for AM) * Time constant switching during band muting * S-meter shifter Noise Canceller * High-pass filter (first order) * Delay circuit based low-pass filter (fourth order) * Noise AGC * Pilot signal compensation circuit * Noise sensitivity setting pin * Function for disabling the noise canceller in AM mode Multiplex Functions * Adjustment-free VCO circuit * Level follower type pilot canceller circuit * HCC (high cut control) * Automatic stereo/mono switching * VCO oscillation stop function (AM mode) * Forced monaural function * SNC (stereo noise controller)
No.8085-2/41
LA1776M
* Stereo display pin * Anti-birdie filter AM * Double balanced mixer * IF amplifier * Detection * RF AGC (narrow/wide) * Pin diode drive pin * IF AGC * Signal meter output (also used for FM) * Local oscillator circuits (first and second) * Local oscillator buffer output * IF counter buffer output (also used by the FM IF) * SD (IF counter buffer on level) adjustment pin * SD output (active high) (also used for AM) * Wide AGC * Detection output frequency characteristics adjustment pin (low cut, high deemphasis) * AM stereo buffer MRC (multipath noise rejection circuit) AM/FM switching output (linked to the FM VCC)
No.8085-3/41
LA1776M
Operating Characteristics at Ta = 25C, VCC= 8.0V, with the specified test circuit and for standards other than Sanyo's for the FM IF input
Ratings Parameter Symbol Conditions min 78 205 190 -1 typ 93 310 295 0 0.3 68 55 5 16 26 30 2.3 0.6 76 68 10 21 31 40 3.5 1.6 0.3 20 4 2 7 35 45 72 72 150 30 8 6 11 42 53 80 80 230 0.1 0.6 2.0 4.5 150 1.8 0 1.2 2.7 5.2 220 2.5 0.1 12 10 15 49 61 88 80 300 0.3 1.8 3.5 5.9 290 3.3 0.2 1.2 5.5 15 26 36 max 112 415 380 +1 1 [FM Characteristics] At the FM IF input Current drain Demodulation output Pin 31 demodulation output Channel balance Total harmonic distortion Signal-to-noise ratio: IF AM suppression ratio: IF ICCO-AM VO-FM VO-31 CB THD-FM mono S/N-FM IF AMR IF Att-1 Muting attenuation Att-2 Att-3 Separation Stereo on level Stereo off level Main total harmonic distortion Pilot cancellation SNC output attenuation Separation ST-ON ST-OFF THD-Main L PCAN AttSNC AttHCC-1 HCC output attenuation AttHCC-2 Input limiting voltage Muting sensitivity SD sensitivity IF counter buffer output Vi-lim Vi-mute SD-sen1 FM SD-sen2 FM VIFBUFF-FM VSM FM-1 Signal meter output VSM FM-2 VSM FM-3 VSM FM-4 Muting bandwidth Mute drive output BW-mute VMUTE-0 VMUTE-100 [FM FE Mixer Input N-AGC on input W-AGC on input Conversion gain Oscillator buffer output VN-AGC VWAGC A.V VOSCBUFFFM VMRC MRC-ON 83 MHz, unmodulated. The input such that the pin 2 voltage is 2.0 V or below 83 MHz, unmodulated. The input such that the pin 2 voltage is 2.0 V or below. (When the keyed AGC is set to 4.0 V.) 83 MHz, 80 dB, unmodulated. The FE CF output No input 83 98 90 85 90 104 140 110 97 110 220 165 dB dB mVrms mVrms No input, I9 + I40 + I46 + I54 + I59 + I60 + I61 10.7 MHz, 100dB, 1 kHz, 100%mod, The pin 15 output 10.7 MHz, 100dB, 1 kHz, 100%mod, The pin 31 output The ratio between pins 15 and 16 at 10.7 MHz, 100 dB, 1 kHz 10.7 MHz, 100 dB, 1 kHz, 100% mod, pin 15 10.7 MHz, 100 dB, 1 kHz, 100% mod, pin 15 10.7 MHz, 100 dB, 1 kHz, fm = 1 kHz, 30% AM, pin 15 10.7 MHz, 100 dB, 1 kHz. The pin 15 attenuation when V33 goes from 0 to 2 V 10.7 MHz, 100 dB, 1 kHz. The pin 15 attenuation when V33 goes from 0 to 2 V*1 10.7 MHz, 100 dB, 1 kHz. The pin 15 attenuation when V33 goes from 0 to 2 V*2 10.7 MHz, 100 dB, L+R = 90%, pilot = 10%. The pin 15 output ratio The pilot modulation such that V39< 0.5 V The pilot modulation such that V39> 3.5 V 10.7 MHz, 100 dB, L+R = 90%, pilot = 10%. The pin 15 signal 10.7 MHz, 100 dB, pilot = 10%. The pin 15 signal/the pilot level leakage. DIN audio 10.7 MHz, 100 dB, L-R = 90%, pilot = 10%. V28 = 3 V 0.6 V, pin 15 10.7 MHz, 100 dB, 10 kHz, L+R = 90%, pilot = 10%. V29 = 3 V 0.6 V, pin 15 10.7 MHz, 100 dB, 10 kHz, L+R = 90%, pilot = 10%. V29 = 3 V 0.1 V, pin 15 100 dB, 10.7 MHz, 30% modulation. The IF input such that the input reference output goes down by 3 dB The IF input level (unmodulated) when V33 = 2 V The IF input level (unmodulated) (over 100 mV rms) such that the IF counter buffer output goes on Unmodulated IF input such that the SD pin goes to the on state 10.7 MHz, 100 dB, unmodulated. The pin 23 output No input. The pin 24 DC output, unmodulated 60 dB. The pin 24 DC output, unmodulated 80 dB. The pin 24 DC output, unmodulated 110 dB. The pin 24 DC output, unmodulated 100 dB. The bandwidth when V33 = 2 V, unmodulated No input. The pin 33 DC output, unmodulated 100 dB, 0 dB. The pin 33 DC output, unmodulated mA mVrms mVrms dB % dB dB dB dB dB dB % % % dB dB dB dB dB dB dB dB mVrms V V V V kHz V V unit
[Multipath Rejection Circuit] MRC input (pin 27) MRC output MRC operating level V24 = 5 V The pin 26 input level at f = 70 kHz such that pin 24 goes to 5 V and pin 27 goes to 2 V 2.9 35 3.0 55 3.1 70 V mVrms
Continued on next page.
No.8085-4/41
LA1776M
Continued from preceding page. Ratings Parameter Symbol Conditions min typ max unit
[AM Characteristics] AM ANT input Practical sensitivity Detector output Pin 31 detector output AGC F.O.M. Signal-to-noise ratio Total harmonic distortion Signal meter output Oscillator buffer output Wide band AGC sensitivity S/N-30 VO-AM VO-AM31 VAGC-FOM S/N-AM THD-AM VSM AM-1 VSM AM-2 VOSCBUFF AM W-AGCsen1 W-AGCsen2 SD sensitivity IF buffer output SD-sen1 AM SD-sen2 AM VIFBUFF-AM 1 MHz, 30 dB, fm = 1 kHz, 30% modulation, pin 15 1 MHz, 74 dB, fm = 1 kHz, 30% modulation, pin 15 1 MHz, 74 dB, fm = 1 kHz, 30% modulation, pin 31 1 MHz, 74 dB, referenced to the output, the input amplitude such that the output falls by 10 dB. Pin 15 1 MHz, 74 dB, fm = 1 kHz, 30% modulation 1 MHz, 74 dB, fm = 1 kHz, 80% modulation No input 1 MHz, 130 dB, unmodulated No input, the pin 15 output 1.4 MHz, the input when V48 = 0.7 V 1.4 MHz, the input when V48 = 0.7 V (seek mode) 1 MHz, the ANT input level such that the IF counter output turns on. 1 MHz, the ANT input level such that the SD pin goes to the on state. 1 MHz, 74 dB, unmodulated. The pin 23 output 0.0 3.9 185 89 80 24 24 180 20 140 130 51 50 210 190 56 56 0.3 0.1 4.9 230 95 86 30 30 220 101 92 36 36 1 0.5 6.8 280 260 61 dB mVrms mVms dB dB % V V mVrms dB dB dB dB mVrms
Note: These measurements must be made using the either the IC-51-0644-692 IC socket (manufactured by Yamaichi Electronics). * 1. When the resistor between pin 58 and ground is 200 k. * 2. When the resistor between pin 58 and ground is 30 k.
Package Dimensions
Unit:mm 3159A Mounted on a 40 x 18 x 1.3 mm3 glass epoxy printed circuit board
Allowable power dissipation, Pdmax - mW
Ambient temperature, Ta - C
No.8085-5/41
KETED AGC VD2
SD/ST IND
0.1F
2.2F 0.022F
5V
+
22k 1k 1F
+
4.3k SW10
10k
39k
100F
3.3F
VA6 56k 46 45 44 43 42 41 40 39 38 37 36 35 34 33 Mute D FMS SW3 48 SW2 49 32 MUTE drive 31
+
+ + +
3.3F 68k
1F
CF OUT
+
0.022F VD5 9pF Vcc2
47
AC3 1000pF 8200pF 0.22F 30 SW4
FM AFC MUTE AMP. H det IF AMP s mut IF AMP FM Vsm Zap MRC noise amp REG BUFF REG AM FM/AM SD ST IND time const Mute ATT control REG FM IF IF count SW
+
50
300 50
0.022F 100k
LA1776M AC Test Circuit
DET OUT VA11
13k 50 51 0.022F 52
IF AMP REG NC.MPX IF count AMP IF AMP IF AMP
330
AN Vcc 29 100k 28 100k
+
AM IF2 Q.DET
AMDET AMLC
IF AMP
MUTE
MUTE
REG 2.7V
022F
PG1 AC1
VA6
AM IF2
0.022F
75
AMIF AGC
HCC SNC 022F VD4 Vcc3
0.022F 53
AM MIX AM
MRC out2
50 54 100k 55 18k 56 57 100H 58 LEVEL DET
W-AGC KEYED AGC REG FE AM/FM SW
ANT D AM RF AGC drive 27
+
1MH
30 AM X OSC
620
AC4 Vsm
FC18G
65pF
15pF
AM W AGC AM N AGC
26 25 24 23 22
MRC OUT 10F 1k MRC IN
100H
47F
1st IF AMP
+
30MH
100k
LA1776M
15pF
+
0.22F
Vsm
0.022F
15pF 60
N-AGC
59 NC HPF ECL + ECL ECL
AM OSC FM RF AGC FM OSC BUFF FM OSC AM OSC BUFF SNC FF 38K FF 19K
8V 2SK212
+
50k 5V
phase comp
+
50k 1k SW5 SW6 0.022F
470 30 61 62 3pF ECL ECL
NC AGC TRIG GATE
0.022F
NC LPF
HCC
VCO stop
tri ger pilot det
21 20 VR1
pilot can FF VCO
0.022F
AM/FM MIX
30k 200k
CSB 912JF108 19 20k 18
Main HC
VA2 IF Buffer 0.047F VR2 100k
Sub De coder MATRIX
SW8 63 1000pF 64
ANT D
SW7
AC2
50
SW9 17 0.01F
50
VA8 0.01F VCO OUT
1
2
3
4
5
6
7 2M
8
9 300pF
10
11
12
13
14 , X TAL
+
15
16
FM RF AGC 4pF 470 470 1F
+
SVC208 18pF
0.022F
20pF 25pF 0.01F 3k
30k
VA1 30k
+
2SC536 2SC536 OSC Buffer SW1 10F FM 8V AM 0V VA9
+
0.022F
10F VA3 VA10 FM Vt HPF OUT AM Vt LPF OUT L-ch R-ch GND VCC VA4
No.8085-6/41
FE Vcc
GND
0.015F
0.015F
VD 1
6800pF 0.01F 10.25MHz
5V ST IND AM/FM SD
0.022F
RF AGC BYPASS
3.3F MUTE ON ADJ
10k
100k
56k
+
0.022F
100F
1F
FM SD ADJ
AFC IN
KEYED AGC
AM IFT
75
0.022F
0.022F
48 AM 2nd MIX IN 1000pF 49 MUTE drive 3 AMDET AMLC 1 2 MUTE
Q.DET SW IF AMP
+
AM ANT D AM WAGC IN 1F
47 FM VSM 32 DET OUT 31 0.22F
+
46
45
AM IF AGC
44
43
42
PILOT DET AM LC
41
40
AM/FM SD ST IND
39
38
37
36
35
34
VREF 2.7V
33
100k min:5k AM IF IN2 50 220
IF AMP
620
1MH
100
51 30 NC IN HCC 29 0.022F AM IF IN 52
AM IF1 IF AMP H det IF AMP s mute IF AMP FM Vsm Zap REG BUFF REG AM FM/AM SD ST IND Mute ATT control REG FM IF IF COUNT SW time const MRC out2 MUTE AMP. IF AMP FM AFC REG NC.MPX IF COUNT AMP
MUTE DRIVE
+ + +
1F
+
1.3k
30k
9pF
2.2F 0.022F
VCC 8V
+
AM IF2
REG 2.7V
8200pF 68k 0.22F 30k
LA1776M Application Circuit Example
100H AM MIX OUT Vsm
AM MIX AM
AM IF OUT FM IF OUT 53
AMIF AGC
ANT D AM RF AGC drive
SNC 28
15pF 15pF
100H 100k 100k AF AGC 56
REG FE FM/AM SW
FC18G
54 FM WB AGC AM SD ADJ 55 AM X OSC AM W AGC AM N AGC
30MH
+
MRC OUT 3.3F 27 MRC GAD ADJ 26 3.3F 51k
MRC noise amp
100k
100H
25 24 23
GND 0.22F AM/FM VSM
+
200
AM IF IN1 FM IF IN1 57
1st IF AMP KEYED AGC
+
+
0.022F
LA1776M
470 59 NC HPF ECL ECL ECL
AM OSC FM RF AGC AM OSC BUFF FM OSC AM OSC BUFF
47pF IN FM NB AGC MUTE ATT 58 LEVEL DET
W-AGC
IF COUNT BUFFER PHASE COM 22
+
0.022F IF Buffer 47k
phase comp HCC VCO stop tri ger
+
0.022F
0.022F
MIX OUT MIX OUT 60
N-AGC
NC LPF
5/2.5/0V 21
SNC pilot det FF 38K FF 19K
12pF
33
AM/FM MIX FE VCC 61 62 ECL ECL
NC AGC TRIG
PHASE COM 20 VCO
+
0.022F
22F
30
1000pF AM MIX IN SVC208 63 10pF 64 10pF MIX IN 1 2 3 4 5
ANT D
- +
pilot can FF GATE Main HC VOC Sub De coder MATRIX
MIX IN
1000pF
100k
CSB 912kHz SEP ADJ 19 20k 0.047F 100k 18 PI CAN OUT 17 PI CAN 0.01F IN 6 7 8 9 10 11 12 13 14 15 16
SVC208
100k
180
1000pF
100k
100k
15pF
+
HOLD
+
NOISE AGC SEN 150k AGC
0.47F AM/FM OSC BUFF 300pF FE GND
FM ANT D
6800pF
LPF OUT
FM RF1F AGC
FM OSC
NC,MPX GND AGC ADJ 0.01F PLL IN 10.25M IN
220k 100 0.1F 0.001F
MPX OUT L
100k
SVC208 18pF
30k
AM OSC
1000pF
65k
8pF
33pF 22pF 1000pF 33k
1000pF
No.8085-7/41
AM/FM VT FE VCC
AM VCC 8V
AM ANT
AM/FM ANT IN
FE GND
AM/FM SW
AM/FM OSC BUFF
10.25kHz IN
L-ch
0.015F MPX OUT R R-ch
0.015F GND
VCC
FM/AM VSM
LA1776M
Pin Descriptions
Pin No. Pin Description Equivalent circuit
VCC ANT 62 pin
RF AGC 1000 pF
1
FM antenna damping drive pin
An antenna damping current flows when the RF AGC voltage (pin 1) reaches VCC - VD.
100 1 1000 pF
500
VCC (61pin)
FET 2ND GATE + 2
12 k
ANT DAMPING
Used to control the FET second gate voltage. 2 RF AGC In AM mode, forcibly set the pin 2 voltage to the low level and apply AGC to the FM RF system.
N AGC DET KEYED AGC W AGC DET
VCC-VD
3
EF. GND
VCC VCC (5 pin)
10 k
Oscillator connection 4 FM OSC This pin is designed to drive an external oscillator circuit that uses external transistors and capacitors.
VT 25 pF 2 k 20 pF
4
Continued on next page.
No.8085-8/41
LA1776M
Continued from preceding page.
Pin No. Pin Description Equivalent circuit
The pin 5 input voltage state (high or low) switches between AM and FM modes. V5 = high (8 V): FM 5 AM/FM SW V5 = low (0 V): AM This level is also used as the FM oscillator circuit VCC.
VCC 5 + FM OSC 8V 3 GND
+ -
AM/FM switching circuit
4V
3 k 3 k 15 k 1 k
6 7
Noise AGC sensitivity AGC adjustment
After setting up the medium field (about 50 dB) sensitivity with the noise sensitivity setting pin (pin 6), set the weak field (about 20 to 30 dB) sensitivity with the AGC adjustment pin (pin 7)
6
200
7
3 k 0.01 F 2 M
+
0.022 F
FM OSC
AM OSC
8
AM/FM oscillator buffer output
This pin is shared by the AM and FM systems.
8
9 VCC (16 pin)
AM system first oscillator 9 AM OSC This oscillator can provide frequencies for use up to the shortwave band. This pin includes an ALC circuit.
ALC
Continued on next page.
No.8085-9/41
LA1776M
Continued from preceding page.
Pin No. Pin Description
0.01F
Equivalent circuit
6800 pF
12
11
VCC
10
10 11
Memory circuit connection
Recording circuit used during noise canceller operation.
Differential amp
Gate circuit
LPF
VCC
30 k
PLL
12
Pilot input
Pin 12 is the PLL circuit input pin.
N.C 11 12
0.01 F
10 k
5.6 V
20 pF
to 2nd MIX
Crystal oscillator circuit 13 AM 2nd OSC Use the HC-49/U-S manufactured by Kinseki, Ltd. CL = 20 pF
33 pF
13 X tal 10.26 MHz
14
N. C, MPX, MRC, GND
Ground for the N, C, MPX, and MRC circuits
Continued on next page.
No.8085-10/41
LA1776M
Continued from preceding page.
Pin No. Pin Description Equivalent circuit
VCC
AM output FM multiplex output 15 16 MPX output (left) MPX output (right) For deemphasis, use the following capacitors: 50 S: 0.015 F 75 S: 0.022 F
15 0.015 F 16 0.015 F 3.3 k 3.3 k
VCC
50 k
17
Pilot canceller signal input
Adjustment is required since the pilot signal level varies with the sample-to-sample variations in the IF output level and other parameters.
10 k
6.7 k
17 0.01 F 50 k
18
VCC
18
Pilot canceller signal output
Pin 18 is the output pin for the pilot canceller signal.
300 330
17 0.01 F 50 k
18
Continued on next page.
No.8085-11/41
LA1776M
Continued from preceding page.
Pin No. Pin Description Equivalent circuit
DECODER 10 k
Composite signal
19
Separation adjustment pin
Use a trimmer to adjust the subdecoder input level. (The output level is not modified in mono and main modes.)
19 20 k 0.01 F
CSB 912 JF108 20 VREF
20
VCO
The oscillator frequency is 912 Hz. JF108
VREF
21 22
PHASE COMP
6 k
+
6 k
19 kHz 90 21 + + 22
Continued on next page.
No.8085-12/41
LA1776M
Continued from preceding page.
Pin No. Pin Description Equivalent circuit
FM SD
+ - 3.3 V
+ - 3.3 V
AM SD
This pin functions both as the IF counter buffer (AC output) and as the seek/stop switch pin.
FM SD
FM mode 23 IF counter buffer seek/stop switching 5 V (high): Seek mode 2.5 V: High-speed SD mode 0 V (low): Reception mode AM mode 5 V (high): Seek mode 0 V (low): Reception mode
+ - 1.3 V
23
51 k
STOP
2.5 V/5V
VCC
24
AM/FM signal meter Fixed-current drive signal meter output
FM S-meter 32 10 k 24 10 k
32
Dedicated FM signal meter
AM S-meter
AM/FM SW
The LA1776M supports two methods: detecting IF Smeter wideband components and detecting the noise canceller high-pass filter noise output. 26 MRC AC input The noise amplifier gain is determined by R2 and the internal 30 k resistor as shown in the figure. Note that the frequency characteristics are determined by C1.
30 k C1 R2 26 + - Dedicated MRC S-meter voltage
VCC 7 A C2 +
VCC
27
MRC output
The MRC detector time constant is determined by a 100 resistor and C2 when discharging and by the 7-A current and C2 when charging.
27 100 28 pin
Continued on next page.
No.8085-13/41
LA1776M
Continued from preceding page.
Pin No. Pin Description Equivalent circuit
VCC
28
SNC control input
The sub-output is controlled by a 0 to 1-V input.
28
VCC
29
HCC control input
The high-frequency output is controlled by an input in the 0 to 1 V range.
32 + 1000 pF 1 F
29
VCC
30
Noise canceller input
The input impedance is about 50 k.
31
+
0.22 F 30 50 k
4.2 V
Continued on next page.
No.8085-14/41
LA1776M
Continued from preceding page.
Pin No. Pin Description
VCC FM detector output 31
Equivalent circuit
Pin 30 is the noise canceller input. The input impedance is 50 k
VCC
10 k
R
30
Noise canceller input Pin 31 is the AM and FM detector output In FM mode, this is a low-impedance output. In AM mode, the output impedance is 10 k. The AM detection output can be modified by adjusting the value of R.
+ AM detector output
0.22 F
31
AM/FM detector output
30 Noise canceller 50 k
VCC
VSM 32
32
IF S-meter output
FM S-meter output block
10 k 29
1000 pF
C1 0.022 F
* The muting time constant is determined by an external RC circuit as described below. Attack time: TA = 10 k x C1 Release time: TR = 50 k x C1 * Noise convergence adjustment The noise convergence when V33 is 2 V will be about 40 dB. (The basis can be varied from 5 to 35 dB for a 1 kHz 22.5 kHz deviation output.) *: There is no hole detection function. * Muting off function The muting function is turned off by a 4 k resistor between pin 33 and ground.
SOFT MUTE
33 VCC MUTE AMP.
33
Mute drive output
SEEK OFF
10 k
50 k
Band muting
SD circuit
Continued on next page.
No.8085-15/41
LA1776M
Continued from preceding page.
Pin No. Pin Description Equivalent circuit
VCC
37 VCC
R2
36
35
34
VCC VCC VCC
Null voltage 34 35 36 Vref: 2.7 V QD output When tuned, the voltage between pins 34 and 37, V34 - 37, will be 0 V. The band muting function turns on when |V34 - 37| 0.7 V.
Quadrature detector
IF limitter amplifier
R1: Resistor that determines the width of the band muting function When R1 is larger ... The band becomes narrower When R1 is smaller ... The band becomes wider The band muting time constants are determined by the following components. During reception: R1, C34, and C38 During seek: R1 and C34
During FM reception: on 38 500 37 + C38
R1 C34
34
38
Band muting time constant switching
Band muting
The band muting time constant can be made smaller by reducing the value of C34. Degradation of total harmonic distortion characteristics at low temperatures can be prevented by make C38 larger.
V23 is switched by the voltage mode as described below. FM mode 5 V: V23 operates in conjunction with the SD pin and IF counter buffer. 2.5 V: V23 operates as the forcible SD mode pin. 0 V: Reception mode AM mode (There are two modes: 0 V or 5 V.) 5 V: Linked operation with the seek SD pin. 2.5 V: Reception mode, no function. 0 V: Reception mode
5V 19 AM/FM SD Stereo indicator
39
AM/FM SD pin Stereo indicator
Seek/stop switching 39
Continued on next page.
No.8085-16/41
LA1776M
Continued from preceding page.
Pin No. 40 VCC Pin IF, NC, MPX, VCC
R
Description
Equivalent circuit
SD Adj 38 4V 20 k + - Comparator SD 24 Vsm S-meter
41
FM SD
The comparison voltage is controlled by an external resistor. In seek mode, the seek operation will stop when V41 < Vsm.
VCC
19 kHz0 BIAS
This pin us used for both FM pilot detection and AM low-cut filter.
30 k
30 k
Pilot detection The system is forced to mono mode when a 1 M resistor is inserted between pin 42 and ground. In AM mode, the frequency characteristics of the unneeded audio band below 100 Hz are modified producing a clear audio signal.
+ 30 k
42
Pilot detector AM L.C
VCC
AM low-cut filter The cutoff frequency fC can be determined from the following formula. FC = 1/2 x 3.3 k x C
DET
3.3 k
1 k + -
3.3 k
1k
42 +C 1 F
Vsm
Dedicated keyed AGC S-meter 43 Keyed AGC The keyed AGC function starts operation when V43 becomes less than or equal to 0.8 V. (Narrow AGC off mode.)
N-AGC + - 1 k 0.8 V
1 k 43
Continued on next page.
No.8085-17/41
LA1776M
Continued from preceding page.
Pin No. Pin Description Equivalent circuit
100 k
44
44
FM muting on level adjust
Modify the value of the external resistor to adjust the muting on level.
soft mute MUTE 2.7 V 30 k
+ C
VCC 3.3 F
48
45 VCC
TR1: Seek mode time constant switching diode Discharge diode * Reception = 3.3 F x 300 k 45 IF AGC * Seek = 3.3 F x 10 The external capacitors are connected to VCC. This is because the IF amplifier operates referenced to VCC.
TR1 SEEK ON 10 3.3 k 500 DET 3.3 k
IF AGC
300 k
40 pin VCC
46 40 pin VCC
46
IF output
The IF amplifier load
DET
Continued on next page.
No.8085-18/41
LA1776M
Continued from preceding page.
Pin No. Pin Description
VCC
Equivalent circuit
RF AGC rectification capacitor The low frequency distortion is determined as follows: Increasing C47 and C56 improves the distortion but makes the response slower. 47 56 RF AGC bypass RF AGC Reducing C47 and C56 aggravates the distortion but makes the response faster. *:If the audio is disturbed due to the RF AGC when there are rapid changes in the reception field strength (on the order of off to 80 dB), the combination of the time constants due to C56 and C47 must be changed.
47 + 3.3 F
5.8 V
10 k
- +
Antenna damping
For AGC use 56 + 47 F
5.7 V 10 k 10 k
50 51
FM IF input IF bypass
Due to the high gain of the limiter amplifer, care must be taken when choosing the grounding point for the limiter amplifer input capacitor to prevent oscillation.
50 330 51
0.022 F
2 k
100
52
IF input
The input impedance is 2 k.
52
IF OUT 53 61 pin VCC
53
IF amplifier output (AM/FM)
* First IF amplifier input pin * Inverted output amplifier The gain is switched between AM and FM modes
IF IN 57
200 300
57
IF amplifier input (AM/FM)
3.75 V
Continued on next page.
No.8085-19/41
LA1776M
Continued from preceding page.
Pin No. Pin Description
40 pin VCC
Equivalent circuit
VCC 40 pin 54
OSC
54 49
AM MIX OUT AM MIX IN
The mixer coil connected to the pin 54 mixer output must be wired to VCC (pin 40). The pin 49 mixer input impedance is 10
49
10.7 M
10.7 M
10 k
62 pin VCC
W-AGC
N-AGC
Pins 55 and 58 include built-in DC cut capacitors. The AGC on level is determined by the values of the capacitors C1 and C2. Pin 55 functions as the SD sensitivity adjustment pin in AM mode. V55 is changed by the value of the external resistor. N-AGC IN SD is operated by comparing V55 with the S-meter voltage. Seek mode stop condition: V55 < Vsm
30 pF 55 C1 50 pF 1.5 k MIX IN 58 C2 20 k MIX OUT + - S-meter AM SD
W-AGC IN 58 AM-SD Adj
FM Vsm 50 pF 48 100 0.022 F I48 VCC
VCC
AM antenna damping drive output 48 Wideband AGC input FM S-meter voltage shift
I48 = 6 mA Antenna damping current Resistor values under 5 k cannot be used for the FM S-meter shift resistor.
20 k
W.AGC AMP. ANT DAMPING DRIVER
Continued on next page.
No.8085-20/41
LA1776M
Continued from preceding page.
Pin No. Pin Description Equivalent circuit
59 60
Y-type mixer circuit 59 60 62 FM/AM MIX output AM MIX input Pins 59 and 60 are the mixer outputs 10.7 MHz (10.71 MHz) Input impedance: 10 k V62 = 2.3 V
62 10 k
OSC
1ST.IF
OSC
59
Double balanced mixer Pins 59 and 60 are the mixer 10.7-MHz output 59 60 63 64 Mixer output Mixer input Pins 63 and 64 are the mixer inputs These are base injection type inputs.
VCC 63 10 pF RF AMP 64 10 pF 30 60
Note: The lines for pins 63 and 64 must be kept separated from the lines for pins 59 and 60.
No.8085-21/41
LA1776M
Test Conditions
Parameter Current drain Demodulation output Pin 31 demodulation output Channel balance Total harmonic distortion (FM) Signal-to-noise ratio: IF AM suppression ratio: IF Symbol ICCO-AM VO-FM VO-31 CB THD-FM mono S/N-FM IF AMR IF Att-1 Muting attenuation Att-2 Att-3 Separation Stereo on level Stereo off level Main total harmonic distortion Pilot cancellation SNC output attenuation HCC output attenuation 1 HCC output attenuation 2 Input limiting voltage Muting sensitivity SD sensitivity 1 SD sensitivity 2 IF counter Buffer output Separation ST-ON ST-OFF THD-Main L PCAN AttSNC AttHCC-1 AttHCC-2 VIN-LIM VIN-MUTE SD-sen1 FM SD-sen2 FM VIFBUFF-FM VSM FM-1 Signal meter output (FM) VSM FM-2 VSM FM-3 VSM FM-4 Muting Bandwidth Mute drive output N-AGC on input W-AGC on input Conversion gain Oscillator buffer output MRC output MRC operating level Practical sensitivity Detection output Pin 31 detection output AGC F.O.M. Signal-to-noise ratio Total harmonic distortion (AM) Signal meter output (AM) Oscillator buffer output Wide band AGC sensitivity BW-mute VMUTE-0 VMUTE-100 VNAGC VWAGC A.V VOSCBUFF-FM VMRC MRC-ON S/N-30 VO-AM VO-AM31 VAGC-FOM S/N-AM THD-AM VSM AM-1 VSM AM-2 VOSCBUFF-AM W-AGCsen 1 W-AGCsen 2 SD-sen1 AM SD-sen2 AM VIFBUFF-AM SW1 OFF ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF SW2 B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B A A A A -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- SW3 OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF ON ON ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF SW4 B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B SW5 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- OFF ON OFF -- -- -- -- -- -- -- -- -- -- -- -- -- ON ON ON ON ON ON ON ON ON ON ON OFF OFF OFF SW6 ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON OFF OFF OFF ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON OFF OFF OFF SW7 OFF OFF OFF OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF -- -- -- -- -- -- -- -- -- -- -- -- -- -- SW8 OFF OFF OFF OFF OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF -- -- -- -- -- -- -- -- -- -- -- -- -- -- SW9 ON ON ON ON ON ON ON ON ON ON ON ON ON ON OFF/ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- SW10 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- ON -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
SD sensitivity IF buffer output
No.8085-22/41
LA1776M
Usage Notes 1.AM/FM Switching Pin 5 is used for switching between AM and FM (dedicated FM oscillator VCC) FM mode: When the pin 5 voltage is greater than 4 V. AM mode: When the pin 5 voltage is less than 4 V.
FM OSC
FM/AM SW
V5 VCC
3 FE GND FM OSC
4
5
2.Pin 39: AM/FM SD and Stereo Indicator Pin 39 is used both for AM and FM station detection and as a stereo indicator. FM mode 5 V: Operates as the SD pin, coupled to the IF counter buffer. 2.5 V: Operates in forced SD mode. 0 V: Reception mode AM mode (two modes: 0 V and 5 V) 5 V: Operates coupled as the seek SD pin 2.5 V: Reception mode, no function 0 V: Reception mode
AM/FM SW
3.Front End Notes on interface characteristics Like the previous Sanyo products, the LA1776M includes the 3 D (triple dimension) AGC circuit. This circuit allow the LA1776M to achieve at the same time both good three-signal interference characteristics (intermodulation characteristics) and two-signal sensitivity suppression characteristics. 3-1. Intermodulation characteristics The LA1776M prevents intermodulation from occurring by applying dual high-band AGC.
110
100
AGC on sensitivity
90 Wide AGC (47 p) 80 Keyed AGC (10 K) 70 Narrow AGC (47 p) 60
Center frequency: 98.1 MHz Keyed AGC (43 pin) = 10 K
50 -5 -4 -3 -2 -1 0 f [MHz] 1 2 3 4 5
No.8085-23/41
FM 8V/
LA1776M
3-2. Two-Signal Sensitivity Suppression Like the earlier Sanyo products, the LA1776M's 3D AGC determines the amount of wide-band AGC applied using the information acquired from three frequency characteristics. RF and antenna circuit information: Mixer input AGC Mixer circuit information: Mixer output AGC <- Three dimensions CF selectivity: S-meter output 3-3. FE Block AGC Like the earlier Sanyo products, the LA1776M uses the follow two functions (1) PIN diode antenna input control (2) FET second gate control The AGC input pins are pin 58 (narrow AGC) and pin 55 (wide AGC). Applying AGC The PIN diode drive circuit is turned on when (roughly) (VCC - V2) is 1 V or higher. In application circuits, there will be about 30 to 40 dB of attenuation. When an adequate current flows in the antenna attenuator PIN diode and the impedance falls, the FET second gate voltage falls, the FET gm falls, and the AGC operates. The recommended FET is the Sanyo 3SK263, which is an enhanced type MOSFET, and thus the full AGC will be applied when the voltage between the second gate and the source (G2-S) is 0. Note that if a depletion type MOSFET were used, AGC would not be applied unless VG2-S were lower than 0 V.
9 Pin 2 voltage 8 7 Region where the AGC does not operate AGC amount due to the PIN diode AGC amount due to the MOSFET's second gate.
AGC voltage - V
6 5 4 3 2 1 0 -20 -10
PIN diode voltage 10 20 30 40 50 60 70 80 90 100 110 120 130
0
Field strength - dB
3-4. Mixer The LA1776M's mixer circuit is a double balanced mixer that used balanced signals for both the input and output. Input type: base input Input impedance: 2 k
59 60
OSC 2 k 2 k
63
64
No.8085-24/41
LA1776M
3-5. Mixer Pin 4: The FM oscillator circuit is formed from external components. Pin 8: AM/FM oscillator buffer
VCC
VCC
VCC
BUFF 4
AM OSC
VT
8 FM/AM OSC BUFF
3-6. FM: First IF Amplifier (10.7 MHz) Input impedance: 330 (pin 57) Output impedance: 330 (pin 53)
No.8085-25/41
LA1776M
4. FM IF 4-1. Notes on FM SD and SD Adjustment The FM station detection and IF counter buffer operate with the following elements.
38
37 AFC VCC SEEK = OFF ST IND + AFC _ 1 2 + _ 1 2 13 12
FM S-meter 2.7 + 0.6 V -0.6 V 4V 2.7 V mute AMP 20 k + SD _ 30 k SEEK = OF + _ Soft mute mute ATT 41 FM SD adj 44 mute on mute d 33 58 IF conut 23 VCC
+ _ 2 3 1
FM IF IF conut 39 SD/ST
IF conut
200 k 30 k 5V 2.5 V 5V
The following conditions must be met for the station detection and IF counter buffer to operate. (1) V24 > V41 - The S-meter voltage must be higher than the pin 41 voltage (2) V33 < 0.7 V (Vbe) - The band muting function must not be operating. (3) V23 = high - A high level (VDD) must be applied to pin 23 from a 51 k resistor. The figure below shows the relationships between the FM station detection, the IF counter buffer output, the Smeter voltage, and the muting operation output.
Larger values of R33 S-meter
V24 V38 V33
Smaller values of R33
V33 over 0.7 V V26 5V SD as an SD signal V23AC OFF V23DC IF count buffer 5V OFF SD ON
V33 over 0.7 V
SD ON
Mono Stereo
IF counter output off
2.5 V
0V
RDS and other types of SD detection can be used by switching these modes.
No.8085-26/41
LA1776M
4-2. Transient Response Characteristics During Automatic Selection The transient response characteristics when the SD or IF counter buffer are turned on or off are determined by the time constant at the pins shown below. (1) AFC time constant - Pin 37 VCC (2) Muting time constant - Pin 33 (3) S-meter time constant - Pin 24 (1) Station detection time constant due to the pin 37 AFC voltage time constant Since there is a function for switching the AFC time constant, it is possible to set the time constants so that there are no harmful effects. For reception mode, if the pin 38 capacitor value is not made comparatively large, the total harmonic distortion may be made worse. * Reception mode time constant: Make the time constant longer with R34_37, C37, and C38. * Seek mode time constant: A high-speed response can be achieved with R34_37 and C37, since the seek mode time constant is independent of C38. * The following values are recommended. C37: About 0.022 F C38: About 1 F (2) Station detection time constant due to the pin 33 muting voltage time constant The volume changes due to fluctuations in the field during weak field reception can be made smoother by setting the soft muting operation attack and release times appropriately.
1 k AFC + - FM STOP: ON FM SEEK: OFF
Vref
34 R34-37
37
38
+ + C34 C37
C38
MUTE DRIVE 10 k Attack 33 C33 50 k Release
MUTE AMP
(3) Station detection time constant due to S-meter time constant Since the pin 24 current (I24) changes with the field strength, the time constant also changes. There is no hysteresis in the comparator circuit. Note that if a smaller value is used for C24, the MRF frequency characteristics setting will need to be changed as well.
FM S-meter
AM S-meter
10 k
24
No.8085-27/41
LA1776M
4-3. FM Muting Function Control (pin 44: soft muting) and Attenuation Setting (pin 58) The -3 dB limiting sensitivity can be adjusted by changing the value of R44. The muting attenuation can be switched between three levels (-10, -20, and -30 dB) with R58.
Output level R58:OPEN R58:200K R58:30K Output level
When R44 is small
When R44 is large V33
R58 OPEN 200 K 30 K
Mute ATT -10 dB -20 dB -30 dB
5.AM Block The LA1776M adopts an upconversion method. 5-1. AM AGC System The RF AGC pickup operates according to the input level on pins 48 and 49. Pin 48: AGC based on the components in the 10.7 MHz CF band. Pin 49: Wideband AGC (The level at which the wideband AGC turns on can be adjusted with Rw.) (The seek mode wideband AGC on level is increased by 10 dB.)
VCC RW 1st MIX RF 62 10.7 MHz CF 57 IF Amp. 57 10.7 MHz 49 2nd MIX 450 kHz CF IF Amp. 52 DET 31
AM AGC SYSTEM
42 1st OSC Middle AGC IN 49 Wide AGC IN IF AGC 45 X'tal
+
1 F VCC
+ 1 F
ANT DUMPING 56 +
RF AGC
47 22 F + 3.3 F
The RF AGC is picked up from two places. 1. The wideband AGC determined by RW. 2. Midband AGC picked up from the second mixer at pin 49. Operating bandwidth: 150 to 180 kHz (the 10.7 MHz CF bandwidth)
No.8085-28/41
LA1776M
5-2. AM SD Pin (pin 39) and the AM SD Adjustment Pin The LA1776M compares V24 and the reference voltage V55 to operate SD and the IF counter.
S-meter
VCC
Comparator + -
AM IF
IF Buff Amp. 50 A 50 pF
55 100 k
24 0.47 F
23
39 100 k
51 k
0.022 F
5V
IF BUFER SEEK 5V
SD
V24PIN V55 V39
Larger values of R55
S-meter
Smaller values of R55
SD ON V23AC OFF V23DC 5V Pin 55: AM SD adjustment pin 0V IF Buffer ON
5-3. AM Wideband Cut and Detection Output Adjustment Methods The AM/FM detection output (pin 31) has an output impedance of 10 k in AM mode, and an impedance of a few tens of ohms in FM mode. Therefore the AM detection output level is lowered by R31 and the AM wideband frequency characteristics are determined by C31.
VCC FM detector 31 R31 C31
VCC AM detector 10 k
+
Noise canceller input 50 k
30
No.8085-29/41
LA1776M
5-4. AM Low Region Cut Adjustment The AM low frequency region frequency characteristics can be adjusted with capacitor C42, which is inserted between pin 42 and ground. Since this capacitor is shared with the FM pilot detector, it is connected to ground. To prevent incorrect operation of the pilot detector, C42 must have a value of 0.33 F or higher.
Detector Output - f [dB]
5
1 k AM detector 1 k Output [dB] Pilot det 42 C42
-15 C42 = 0.47u -20 0.01 0.1 C42 = 1u 1 10 -5
+ -
10 k To 31PIN
0
-10
Modulation frequency [kHz]
6.Noise Canceller Block 6-1. The noise canceller input (pin 30) has an input impedance of about 50 k. The low band frequency characteristics require care when determining the value for the coupling capacitor. Note that fC will be about 3 Hz in an application that uses a 1 F capacitor. 6-2. The noise detection sensitivity and the noise AGC are set with pins 8 and 9. Good settings can be acquired by first setting the medium field strength (corresponding to an antenna input of about 50 dB) sensitivity with the noise sensitivity setting pin (pin 8) and then setting the weak field (20 to 30 dB) with the AGC adjustment pin (pin 9). Note that if the noise detection sensitivity is increased, the effect of the AGC will be improved, but that inversely the weak field sensitivity will be decreased. The problem of incorrect operation of the noise canceller for 10 kHz overmodulation occurs when an overmodulated signal is input and the noise canceller responds to that signal even though it should not. The cause of this is the IF detector output taking on the sort of waveform shown in the figure due to the band of the IF ceramic filter as shown below. (150 kHz x 1, 180 kHz (r) 2, f = 10 kHz, 180 kHz deviation) The noise canceller responds to the whisker components generated by this overmodulation, resulting in distortion of the audio output. (The whisker components due to the overmodulation are generated by the band of the ceramic filter in the tuner.) This can be prevented as follows. The incorrect operation due to the overmodulation can be eliminated by removing the whisker components due to the overmodulation as described above with the lowpass filter consisting of a 1 k resistor and 220 pF capacitor as shown in the figure. Note, however, that the FM separation characteristics in the high band and the AM frequency characteristics will change.
H1 W1 2.5OU
IF audio output f = 10 kHz, 180 kHz dev
IF output 31
1 k
2200 pF
Noise canceller input +- 30 1 F
-2.5OU -19.00 s
981.00 s
No.8085-30/41
LA1776M
7.Multiplex Block 7-1. Pilot Canceller The pin 18 pilot canceller signal waveform is a 19 kHz signal in which the third harmonic is not present. Since this signal has the same phase as the pilot signal, no capacitor is required between pin 18 and ground. Since the third harmonic is not present, excellent pilot cancellation in both the left and right channels can be acquired by adjusting the circuit with a variable resistor.
Noise canceller 30 input To the multiplexer
-
GATE PILOT CANCEL 10 6800 pF 11 17 18
0.01 F 50 k
7-2. Separation Adjustment (pin 19)
5 k 19 20 k 0.047 F C
To the subdecoder Larger
The separation is adjusted by adjusting the sub-decoder input level with the pin 19 variable resistor VR. Adjusting VR only changes the sub-channel modulation. It does not change the monaural (main) output level. Degradation of high band separation in the decoder can be avoided if the impedance of the external capacitor value (C) is made enough smaller than the impedance of VR in the sub-channel signal frequency band (23 to 53 kHz).
8. MRC Block
7 A 100 5.5 k 5.5 k FM/AM Vsm FM Vsm 10 k 1 k HPF: C26, 30K LPF: C32 Gain: R26 24 C24 0.22 F + C32 1000 pF 100 k 32 26 C26 3.3 F R26 51 k 27 + 30 k DC BUFFER MRC
C27
*: When the AC component is removed with C24.
No.8085-31/41
LA1776M
8-1. The S-meter DC input voltage is set by the variable resistor R1 connected to pin 32. While it is often said that a curve such as that shown in figure 59 is ideal for separation control when multipath interference occurs, if the pin 32 voltage is too high, separation control in strong field reception, as shown in figure 60, will become impossible. Thus it is desirable to adjust the circuit so that the pin 32 voltage remains under 2 V when saturated.
ACo% SEP (dB) SEP (dB) AC 30% ACo%
AC 30%
AC 60% AC 100%
AC 60% AC 100%
Field strength
Field strength
8-2. The time constant with which the MRC circuit controls the separation is determined by an internal 100 resistor and C2 during charge and by a constant current of 7 A and C2 during discharge.
VCC 7 F 41 100
+
VCC
C2
No.8085-32/41
LA1776M
Crystal Oscillator Element Kinseki, Ltd. Frequency: 10.26 MHz CL: 20 pF Model No.: HC-49/U-S Coil Specifications Sumida Electronics, Ltd. [AM Block] AM FILTER (SA-1051)
1 2 3
AM OSC (SA-359)
S
3 2 4
6
4
1
6
AM IF1 (SA-264)
3 4
AM IF2 (SA-1063)
3 2 4
S2
1 6
1
6
S
S
S
AM loading (SA-1062)
3 2 1 6 4
AM ANT IN (SA-1048)
3 2 1 6 4
S
S
AM RF amplifier (RC875-222J)
0.1o2UEW
[FM Block] FM RF (SA-1060)
S
3 2 1 6 4
FM ANT (SA-1061)
3 2 1 6 4
S
S
FM OSC (SA-1052)
3 2 1 6 4
FM MIX (SA-266)
S
3 2 1 C1 4
8
7 C2
6
S
S
FM DET (SA-208)
S
3 2 1 6
S
4
No.8085-33/41
LA1776M
The Toko Electric Corporation [AM Block] AM FILTER (A2861BIS-15327)
1 2 3
AM OSC (V666SNS-214BY)
3 2 4
6
4
1
6 0.1o2UEW
AM IF1 (7PSGTC-5001A)
3 2 1 6 0.05o3UEW 4
AM IF2 (7PSGTC-5002Y)
3 2 1 6 0.05o3UEW 4
AM loading (269ANS-0720Z)
3 2 1 6 0.05o3UEW 4
AM ANT IN (385BNS-027Z)
S
3 2 1 6 4
S
AM RF amplifier (187LY-222)
0.1o2UEW
[FM Block] FM RF (V666SNS-208AQ)
S3
2 1 4
FM ANT (V666SNS-209BS)
3 2 4
o0.1 - 2UEW 6S
o0.1 - 2UEW
1 6S
FM OSC (V666SNS-205APZ)
3 2 1 4
FM MIX (371DH-1108FYH)
S3
2 4 5
o0.12 - 2UEW 6S
o0.07 - 2UEW
1 6S
FM DET (DM600DEAS-8407GLF)
3 2 1 6 0.07o2MUEW 4
No.8085-34/41
LA1776M
Sagami Elec Co., Ltd. [AM Block] AM FILTER (000021055)
1 2 3
AM OSC (000021056)
S
3 2 4
5.1 H
6
4
1
6
AM IF1 (000021057)
3 2 4
AM IF2 (000021059)
3 4
180 pF
2 6S 1 6
180 pF
S1
S
AM loading (000021061)
3 2 1 6 4
AM ANT IN (000021062)
3 4
30 mH
2 1 6
100 H
S
S
AM RF amplifier (000021063)
2.2 mH
[FM Block] FM RF (000021064)
S
3 2 1 6 4
FM ANT (000021065)
3 2 1 6 4
105.5 nH
S
S
FM OSC (000021066)
3 2 1 6 4
FM MIX (000021067)
S
3 4 5 6
62.7 nH
2 1
1-2:100 pF 2-3:100 pF
S
S
FM DET (010021075)
S3
2 1 6 4S
1-3:20 H 3-4:120 pF
No.8085-35/41
LA1776M
FM Input/Output Characteristics
10 0 -10 8 7 6 9
FM Input/Output Characteristics
Total harmonic distortion, THD - % S-meter voltage, Vsm - V Total harmonic distortion, THD - % S-meter voltage, Vsm - V
8 7 6 5 4 3 2 1 0
S
RF AGC
Output - dB
-20 -30 -40 -50 -60 -70 -20 -10
Vsm
5 4 3
AMR(1K,30%)
2
ANT D THD (100%)
10 20 30 40 50 60 70 80
N
0 10 20 30 40 50 60 70 80
1 0 90 100 110 120 130
THD (30%)
90 100 110 120 130
0 -20 -10
Field strength - dB
Field strength - dB
FM Separation Input/Output Characteristics
10 0 -10 -20 -30 -40 -50 -60 -70 -20 -10 0 90 100 110 120 130 3 4 10 0 -10
AM Input/Output Characteristics
8
S
7 6
Output - dB
-20 -30 -40 -50 -60 -70 -20 -10
Vsm
5 4 3 2
SEP(R) SEP(L)
2
Vsnc
1
N
1 0 90 100 110 120 130
0
10 20 30 40 50 60 70
80
0
10 20 30 40 50 60 70
80
Field strength - dB
Field strength - dB
AM Input/Output Characteristics
8 2
AM Frequency Characteristics
6
AGC - V Total harmonic distortion, THD - %
7 0 6 5 4
5
Output - dB
RF AGC
-2
THD (80%)
4
-4
3
THD (80%)
3 2
THD (30%)
-6
2
THD (30%) ANT D
-8 1
1 0 -20 -10 -10 10 0 7 10k
0
10
20
30
40
50
60
70
80
90 100 110 120
2
3
5
Field strength - dB
10
7 100
2
3
5
7 1k
2
3
5
Frequency, fm - Hz
10
AM Two-Signal Interference Suppression Characteristics ( 40 kHz)
S(80 dB)
AM Two-Signal Interference Suppression Characteristics ( 400 kHz)
S (80 dB) S(40 dB) S(60 dB)
0
0
-10
S (40 dB)
S (60 dB)
-10
-20
-20
-30
N (40 dB) N (60 dB) N (60 dB) N (80 dB) N (80 dB)
60 80 100 120 140
-30
N(40 dB) N(60 dB) N(60 dB) N(80 dB)
60 80 100 120 140
-40
-40
-50 -60 40
-50 -60 40
N(80 dB)
fu input level - dB
fud input level - dB
No.8085-36/41
Total harmonic distortion, THD - %
output
S-meter voltage, Vsm - V
Separation, Sep - dB Vsnc - V
LA1776M
FM Temperature Characteristics
400 80
FM Temperature Characteristics
output
350 70
S/N S/N, AMR - dB
Output - mV rms
300
60
AMR (80 dB) AMR (50 dB)
250
50
200 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
40 -40
-30 -20 -10
0
10
20
30
40
50
60
70
80
90
Ambient temperature, Ta - C
Ambient temperature, Ta - C
FM Temperature Characteristics
Q.S., U.S., Noise convergence - dB, dB
20 40
FM Temperature Characteristics
15
30
Q.S (S/N = 50)
-3dB L.S - dB
10
5
B (m -3d
o ute
n)
20
Noise convergence
0
-3dB (mute off)
10
U.S (S/N = 30)
-5 -40
-30 -20
-10
0
10
20
30
40
50
60
70
80
90
0 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
Ambient temperature, Ta - C
Ambient temperature, Ta - C
FM Temperature Characteristics
100 50
FM Temperature Characteristics
N-AGC, W-AGC on level - dB
90
W-AGC Separation, Sep - dB
40
SEP (80 dB)
30
80
70
20
60
N-AGC
SEP (35 dB)
10
50 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
0 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
Ambient temperature, Ta - C
Ambient temperature, Ta - C
FM Temperature Characteristics
3 3
FM Temperature Characteristics
Total harmonic distortion, THD - %
2.9
Va
fc
Vafc,Vref - V
2
2.8
2.7
Vref
2.6
1
THD (mono)
2.5
THD (main)
0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 2.4 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
Ambient temperature, Ta - C
Ambient temperature, Ta - C
No.8085-37/41
LA1776M
FM Temperature Characteristics
0.5 0.4 0.3 0.2 120 130
FM Temperature Characteristics
Vnull - V
0.1
SD bandwidth - kHz
110
Vnull
0 -0.1 -0.2 -0.3 -0.4 -0.5 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
SD bandwidth
100
90
80 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
Ambient temperature, Ta - C
Ambient temperature, Ta - C
FM Temperature Characteristics
80 60 40 20 0 -20 -40 -60 -80 -40 -30 -20 -10 40
FM Temperature Characteristics
SD bandwidth (+)
35
SD bandwidth - kHz
SD on level - dB
30
SD bandwidth (-)
25
SD o
20 -40 -30 -20 -10
n lev
el
0
10
20
30
40
50
60
70
80
90
0
10
20
30
40
50
60
70
80
90
Ambient temperature, Ta - C
Ambient temperature, Ta - C
FM Temperature Characteristics
70 6
FM Temperature Characteristics
Vsm (80 dB)
5
Signal-to-noise ratio with IF beating - dB
S-meter voltage, Vsm - V
Vsm (70 dB)
4
60
Vsm (60 dB) Vsm (50 dB) Vsm (40 dB)
96.3 MHz beating worst case
3
50
M 107
40 -40 -30 -20 -10
Hz
be
atin
t ors gw
cas
e
2
Vsm (30 dB)
1
0
10
20
30
40
50
60
70
80
90
0 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
Ambient temperature, Ta - C
Ambient temperature, Ta - C
FM Temperature Characteristics
400 80
FM Temperature Characteristics
S/N
350
output S/N, AMR - dB
70
AMR (60 dB)
60
output - mVrms
300
50
250 40
200 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
30 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
Ambient temperature, Ta - C
Ambient temperature, Ta - C
No.8085-38/41
LA1776M
FM Temperature Characteristics
80 60
FM Temperature Characteristics
70
ST S/N (15 kHz)
60
50
-3 dB L.S - dB
ST S/N - dB
ST S/N (OFF)
50
40
30 40
-3 dB (mute on)
30 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
20 -40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
Ambient temperature, Ta - C
Ambient temperature, Ta - C
FM Temperature Characteristics
90 60
FM Temperature Characteristics
N-AGC on LEVEL - dB
N-AGC on
80
SD on LEVEL - dB
85
55
50
SD on le
45
vel
75
70 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
40 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
Ambient temperature, Ta - C
Ambient temperature, Ta - C
FM Temperature Characteristics
3 6
FM Temperature Characteristics
IF count BUFF LEVEL - mVrms
Total harmonic distortion, THD - %
5
2
4
3
IF co
2
unt b
uff
1
THD (mono) THD (main)
0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
1
0 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
Ambient temperature, Ta - C
Ambient temperature, Ta - C
FM Temperature Characteristics
6
Vsm (8
S-meter voltage, Vsm - V
0 dB) 0 dB) 0 dB)
Vsm (90
dB)
Vsm (7
4
Vsm (6
Vsm (50 dB)
Vsm (40 dB)
2
Vsm (30 dB)
0 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
Ambient temperature, Ta - C
No.8085-39/41
LA1776M
AM Temperature Characteristics
70 40
AM Temperature Characteristics
Practical sensitivity - dB, SD on - dB
S/N, AGC FOM - dB
35
60
SD
S/N
30
AG
50
CF
OM
sitivit al sen ractic P
y
25
40 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
20 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
Ambient temperature, Ta - C
Ambient temperature, Ta - C
AM Temperature Characteristics
6 60
AM Temperature Characteristics
N-AGC, W-AGC on LEVEL - dB W-AGC
55
Vsm (74 dB)
5
Vsm (130 dB)
4
W-AGC (SEEK)
Vsm - V
3
50
Vsm (30 dB)
2
N-AGC
45
1
Vsm (-20
0 -40 -30 -20 -10
dB)
0 10 20 30 40 50 60 70 80 90 40 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
Ambient temperature, Ta - C
Ambient temperature, Ta - C
AM Temperature Characteristics
5 0
AM Temperature Characteristics
Total harmonic distortion, THD - %
4
-1
AM LC (100 Hz) - dB
3
-2
THD (0.1 k, 80 %)
2
-3
TH
1
D
(1
k, 8
0%
THD (0.1 k, 30 %)
)
100 Hz attenuation
-4
0 -40 -30 -20 -10
THD (1 k, 30 %)
0 10 20 30 40 50 60 70 80 90
-5 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
Ambient temperature, Ta - C
Ambient temperature, Ta - C
No.8085-40/41
LA1776M
Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO products(including technical data,services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be expor ted without obtaining the expor t license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only ; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of July, 2005. Specifications and information herein are subject to change without notice.
PS No.8085-41/41

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