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CXA1991N
FM Pager/FM Multiplex Tuner For the availability of this product, please contact the sales office.
Description The CXA1991N is a tuner IC designed for use in FM pagers and FM multiplex broadcasting. A receiver system can be configured by using the digital data output, in combination with a decoder. It has a battery save function and ultra-low power consumption. Features * Ultra-low power consumption (ID = 1.2 mA for FM; ID = 0.8 mA for AM; VCC = 3 V) * LED drive circuit for tuning * Battery save function * Few external parts Applications * Tuners for FM multiplex broadcasting * FM pagers 20 pin SSOP (Plastic)
Absolute Maximum Ratings (Ta=25 C) * Supply voltage VCC 14 V * Operating temperature Topr -20 to +75 C * Storage temperature Tstg -65 to +150 C * Allowable power dissipation 400 mW PD Operating Conditions Supply voltage
VCC
1.8 to 4.5
V
Block Diagram
FM MIX AM OSC GND 1 FM RF FM OSC FE OUT AM IN FM IN REG TUNE
11
20
19
18
17
16
15
14
13
12
FM FRONT END
REG
METER
AM FRONT END
AGC BUFF
AM IF, IF DET AGC
FM IF DET
BATTERY SAVE CONT
1
2
3
4
5
6
7
8
9
10
FM IF
BAND
GND 2
DISCRI
AM IF
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
--1--
DET OUT
AGC
AFC
E95925B8Y
VCC
B.S
CXA1991N
Pin Description Pin No. Symbol Pin voltage (V) FM AM Equivalent circuit
(VCC=3 V, Ta=25 C) Description
220k
1
AM IF IN
1.1
1.1
1
AM IF input pin.
2
AGC
0.3
0.4
2
130 100k
130
Connected to a capacitor.
9
9
DET OUT
0.9
0.7
Detection output pin.
3
FM IF IN
1.1
0
VCC
VCC
FM IF input pin.
330
3
4
4
BAND
1.1
0
AM/FM band switching pin. AM when grounded, FM when open. IF system ground.
5
GND2
0
0
VCC
6
DISCRI
2.0
2.4
2k
6
1.1k
Connected to phase shift circuit and ceramic discriminator.
7
VCC
3.0
3.0
--2--
CXA1991N
Pin No.
Symbol
Pin voltage (V) FM AM
Equivalent circuit
Description
8
160k
8
BS
550k
Controls battery save via microcomputer. High = Active, Low = Save
10
AFC
1.0
0.7
10 200k
REG
AFC varicap pin.
13
13
FM OSC
1.1
1.1
FM local oscillation circuit.
11
TUNE
1.1
1.1
11
VCC
AM/FM tuning indicator drive circuit.
REG
12
AM OSC
1.1
1.1
12
AM local oscillation circuit.
VCC
14
REG
1.1
1.1
14
Regulator output pin.
--3--
CXA1991N
Pin No.
Symbol
Pin voltage (V) FM AM
Equivalent circuit
VCC REG 11p 10k
Description
15
FM MIX
1.1
1.1
15
Load for mixer which resonates at 10.7 MHz from internal capacitance and external coil.
VCC
16
FM RF
1.1
1.1
50k 18 5k
FM RF amplifier circuit which is connected to RF tank circuit
REG
16
18
FM RF IN
2.2
2.4
FM RF amplifier circuit which is FM RF input.
VCC
17
AM RF IN
1.1
1.1
17
AM RF input which is connected to bar antenna.
19
GND1
0
0
VCC
Front-end ground.
15 20 FM Block
20
FE OUT
0.6
1.5
3k AM Block
AM/FM IF output pin which is connected to IF filter.
--4--
Electrical Characteristics
Bias and SW conditions MIN Limit Min. Typ. Max. Input Input waveform and bias description point measurement method description BS TUNE FEOUT point Measurement Output waveform and Unit S3 S4 S5
VCC=3 V, Ta=25 C
S1
S2
Measurement
Standard Bias Conditions OFF -- A1 AM no signal OFF OFF FM no signal 0.60 1.25 1.90 mA
Functional block
Measurement No.
1
Current consumption
for FM no signal -- ON -- Vin=40 dBV, 100 MHz CW Vin=90 dBV, 10.7 MHz 22.5 kHz DIV Vin=90 dBV, 10.7 MHz 22.5 kHz DIV Vin=90 dBV, 10.7 MHz 75 kHz DIV Vin=90 dBV, 10.7 MHz CW ON Vin=60 dBV, 10.7 MHz CW ON V1 Vin=75 dB V, 1660 kHz CW Vin=455 kHz, 30 %mod Vin=80 dBV, 455 kHz, 30 % ON Vin=80 dBV, 455 kHz V1 Vin=100 dBV, 1660 kHz, 30 % 9 pin14 pin A2 VB VD V3 level when VB level for input of V3 = 90 dBV drops by -3 dB. VA
OFF
OVER
OFF
2
Current consumption
for AM no signal
ON
BAND
item
0.30 0.75 1.20
mA
3 OFF V2
Current consumption
for battery save
OFF
-- 10.7 MHz
--
1.00
A
4 FM front-end gain
ON
OFF
10
20
30
dB
5
FM detection V3
output level
39.0 73.5 123.5 mVrms
6 FM IF knee level
22.5 33.0 43.5 dBV
--5--
OFF VA V4 VD VD A2 OFF VB
7
FM detection
output distortion
-- Frequency offset from 10.7 MHz when Pin 9-Pin 14 DC potential difference is 0 mV.
0.3
1.0
%
8
IF center
frequency offset
-50
0
50
kHz
9 FM meter current
1.25 2.90 4.45 455 kHz
mA
10 AM front-end gain
ON
25
28
31
dB VIN level for -40 dBm output. 25.0 29.0 33.0 dBV
11 AM IF gain
12
AM detection
output level
43.5 65.5 98.0 mVrms
13 AM meter current
1.50
2.9
4.30
mA
14
AM detection
output distortion
OFF
--
0.60 3.00
%
CXA1991N
Electrical Characteristics Measurement Circuit
150 43p 100 0.1 0.01 150H
V1
V2 10 33p 12H S4
BPF
39p
30p
VC
20
REG FM IN AM IN FM MIX GND 1 FM RF FM OSC FE OUT AM OSC
19
18
17
16
15
14
13
12
11 A2
TUNE
--6--
VCC DISCRI GND 2 BAND AM IF FM IF AGC
CF1
CF2
AFC
DET OUT
B.S
330
S1
1
2
3
4
5
6
7
8
S3
9
180k 1 DISCRI 20k
10
VA
S5
3k
S1
0.47
V3 1 S2 0.1
0.1
V4
0.1
0.1
100 A1 VB 10k 0.01 CF1 : FFE1070NA CF2 : PFB455JR DISCRI : CDA10.7MG1 Switch mode ON OFF VD
CXA1991N
CXA1991N
DET OUT1 (AF) LED1 10 0.47 C11 12 C4
AM OSC DET OUT
9
VC
7P
L5
C12
13
14
12H
L3
15
FM MIX
DISCRI
6
16
C2
FM RF
GND 2
7P
L2
5
DISCRI
C10
0.1
17
C1
AM IN
BAND
4
AM
0.1
C8
VCC
REG
VCC
7
OFF
L4
C9
100
C3
FM OSC
B.S
8
S2
ON
180k 1 R5 20k
R4 C13
7P
TUNE
AFC
10k 0.01
11
10
C5
R3
FM IN
FM IF
GND 1
AGC
C7
20
FE OUT
AM IF
Application Circuit
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
CF1
--7--
CF2
1
1
CF1 : FFE1070NA CF2 : PFB455JR DISCRI : CDA10.7MG1
0.1
C6
L1
FM
18
19
2
3
S1
DET OUT2 (DF)
BPF
CXA1991N
FM I/O characteristics (DET OUT 1) 0 S+N -10
Output level ratio [dB]
-20 -30 -40 N -50 -60
fc=100MHz fs=1kHz, 22.5kHz dev. VCC=3.0V -4 -3 -2 -1
T.H.D 0 10 20 30 40 50 60 70 80 90 100
-10
110
Input level [dBV]
AM I/O characteristics (DET OUT 1) 0 S+N -10 -20 -30 -40 N -50 -60 T.H.D -2 -1
-4 -3
-10
0
10
20
30
40 50 60 Input level [dBV]
70
80
90
100
110
DET OUT 2 frequency response 0 -10 VCC=3V fC=10.7MHz 22.5kHz dev. VIN=80dBV
Output level ratio [dB]
-20 -30 -40 -50
100
500 1k
5k 10k fs [Hz]
50k 100k
--8--
T.H.D.-Total harmonic distortion [%]
Output level ratio [dB]
fc=1660kHz fs=1kHz, 30% mod. VCC=3.0V
T.H.D.-Total harmonic distortion [%]
CXA1991N
Coil Data
AM OSC
Core diameter o 0.06 2UEW f [MHz] 1 to 3 2. 11 C [pF] 1 to 3 33 Q 1 to 3 40 Number of windings [t] 1 to 3 1 to 2 2 to 3 56 14 42
3 2 1
4
6
S
Equivalent to L7BRCS-1726Y TOKO Co., Ltd.
FM OSC 4mm 0.6mm 3.5t
FM RF 5mm 0.6mm 3.5t
AM bar antenna
Core diameter o 0.09 USTC
PRIMARY
f [kHz] 796
SECONDARY
L [H] 650
Primary Secondary 121t 22t
Q 120
CF1 CF2 DISCRI VC VC (Rear Mount)
FFE1070NA PFB455JR CDA10.7MG1 PVC2LXT16L HU22124N700 PVC2LXT16B
TDK Co., Ltd. Murata Mfg. Co., Ltd. Murata Mfg. Co., Ltd. Mitsumi Electric Co., Ltd. TOKO Co., Ltd. Mitsumi Electric Co., Ltd.
--9--
CXA1991N
Notes on Operation 1.De-emphasis time constant Time constants are determined by R4, R5 and C13. The calculation formula is as follows. {R4 * R5/(R4 + R5)} * C13 2.FM discriminator Quadrature detection is used for FM detection. A ceramic resonator is used in the phase shifter so that no adjustment is required. In order to eliminate problems of distortion and offset with IF band center frequency, the CF1 (FM * IF) and FM discrete pair combination should be of the same level. A red B blue C orange D black E white CF1 and Discrete fo 10.70 MHz 10.67 MHz 10.73 MHz 10.64 MHz 10.76 MHz
3.Battery save function The battery save function operates when Pin 8 is grounded. Current consumption is 1 A or less during battery save. To switch from battery save mode to normal mode, Pin 8 is connected to VCC. At this time the DET OUT (Pin 9) rise time is affected by the rise time of Pins 4, 10 and 14. For faster rise time, lower the capacitance values of bias capacitors C5, C6 and C8, taking care that characteristics do not deteriorate. Also, decrease or eliminate R3 and C11 time constants and control Pin 10 directly with DC voltage of approximately 1.1 V to improve rise time. 4.Notes on pattern preparation i) FM antenna, OSC coil configuration Change the direction 90 degrees in order to avoid M coupling. Also, insert Pin 14 pattern between Pins 13 and 16 and the pattern between the coils. (See "Standard Board Diagram".) ii) Tuning circuit The capacitance value of the tuning circuit varies according to the board; investigate the time constants for new boards. iii) GND pins Pin 5 is the ground pin for IF and Pin 19 is the ground pin for FE. Use as thick a pattern as possible for the antenna input, BPF and Pin 19 grounds, as they have a significant effect on stability and NF characteristics. iv) The ground point for by-pass capacitors C5 and C6 connected to Pin 14 should be as close to Pin 14 as possible. v) When the tuning indicator is not used, connect Pin 11 to ground. This will put the tuning indicator drive circuit into low power consumption mode and current ceases to flow to the indicator. Also, the current consumption ICC is eliminated. vi) Use the BPF for FM. --10--
CXA1991N
Standard Board Diagram
Component side symbols
Solder pattern side
Component pattern side
--11--
CXA1991N
Package Outline
Unit : mm
20PIN SSOP (PLASTIC)
6.5 0.1 + 0.2 1.25 - 0.1 0.1 20 11 A
4.4 0.1
1
10 0.65
b
0.13 M
+ 0.05 0.15 - 0.02
(0.22) 0.1 0.1
b=0.22 0.03
0.5 0.2
DETAIL B : SOLDER
(0.15)
DETAIL B : PALLADIUM
NOTE: Dimension "" does not include mold protrusion. 0 to 10
PACKAGE STRUCTURE
DETAIL A
PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE SSOP-20P-L01 SSOP020-P-0044 LEAD TREATMENT LEAD MATERIAL PACKAGE MASS EPOXY RESIN SOLDER / PALLADIUM PLATING 42/COPPER ALLOY 0.1g
NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).
--12--
+ 0.03 0.15 - 0.01
+ 0.1 b=0.22 - 0.05
6.4 0.2

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