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ILA1238NS
AM/FM MONO RECEIVER
ILA1238NS (analog of CXA1238S, SONY) - high-quality one-chip stereoreceiver designed for receipt of AM/FM signals of broadcasting stations. The receiver contains: high-frequency amplifiers and AM and FM mixers, AM and FM intermediate frequency amplifiers, AM and FM detectors, output decoder of stereosignal for coding system with pilot tone. * Low consumption current (in FM mode Icc=12.5 mA, in mode Icc=9.5 mA at Ucc=6 V) * LED indication of tuning * LED indication of "STEREO" mode * Switching-off noiseless FM tuning * Small number of peripheral components
PACKAGE 30-pin mini-DIP TA = -10...+70 C
BLOCK DIAGRAM
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
VCO
MULTIPLEX REGULATOR 1/2 COUNTER PD1 PD2
FM FE REGULATOR
MUTING AUTO BLEND DC AMP BU AMP DETUNE MUTING CONTROL 11 12
AM FE FM IF DISCRI AM IF DET
TUNING IND
DECODE AMP M/ST SW DC AMP
BU AMP RIPPLE FILTER
DC AMP 9 10
1
2
3
4
5
6
7
8
13
14
15
Note: VCO - voltage controlled oscillator, REGULATOR - reference voltage source, MULTIPLEX REGULATOR - reference voltage source for stereodecoder, FM FE - heterodyne oscillator, high frequency amplifier and FM path mixer, AM FE - heterodyne oscillator, high frequency amplifier and AM path mixer, FM IF DISCRI - intermediate frequency amplifier and FM path demodulator, AM IF DET - intermediate frequency amplifier and AM path detector , TUNING IND - tuning indicator driver, DETUNE MUTING CONTROL - muting control block, DC AMP - DC amplifier, BU AMP - buffer amplifier, M/ST SW - "MONO"-"STEREO" switch, DECODE AMP - decoder and LF signal amplifier,
1
ILA1238NS
RIPPLE FILTER - internal stress source with ripple filter, 1/2 COUNTER - VCO frequency devider, PD1,PD2 - phase detectors of VCO frequency tuning AUTO BLEND - signal level block for VCO frequency tuning, MUTING - "MONO" and "STEREO" modes control block. ABSOLUTE MAXIMUM RATINGS Symbol Parameter Ucc Supply voltage Topr Operation temperature Tstg Storage temperature Tjmax Junction maximum temperature Pd Allowable power dissipation RECOMMENDED OPERATION CONDITIONS Symbol Parameter Ucc Supply voltage PINS DESCRIPTION Symbol Voltage, V Ucc=3V Ucc=6V FM FM 0.86 0.86 0.86 0.86 0.86 0.86 0.86 0.86 Equivalent electrical circuit Description Value 10 -10 ... +70 -55 ... +150 125 500 Unit V C C C mW
Value 2.0 ... 9.0
Unit V
1 29
PLL LPF1 PLL LPF2
26K
MPX REG 26K
Low frequency filter for VCO phase selftuning circuit
29
2 3 PILOT DET LPF1 (c) PILOT DET LPF2 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95
1
Pins for connecting capacitance of low frequency filter of pilot tone detector
3 2
MPX REG
4 ST IND VCO CHECK 1.6 1.6 4.5 4.5
13K
4 VCO
Pin of indicator of "STEREO" mode and frequency control 76 kHz
2
ILA1238NS
PINS DESCRIPTION (CONTINUED) Voltage, V Symbol Ucc=3V Ucc=6V FM FM 5 6 Rch OUT Lch OUT 1.25 1.25 1.45 1.45 1.35 1.35 2.0 Equivalent circuit Description
Right channel pin
5
2.0
6
Left channel pin
7
Ucc
3.0
3.0
6.0
6.0
Supply
17K
8 Ripple FILTER 2.5 2.5 4.0 4.0
17K
Internal voltage source filter
8 130K 33K
9 10
AGC/AFC1 AGC/AFC2
1.47 1.15
1.15 1.47
1.47 1.15
1.15 1.47
22K 5.3K 25K
9
50K
50K 10
Pins of heterodyne AFC filter for FM path and AGC for AM path
11
GND
0
0
0
0
25
Common output of paths IF FM, IF AM and detectors Connection pin of muting time constant capacitance
25
MUTE
0.05
0.1
0.05
0.1
11
3
ILA1238NS
PINS DESCRIPTION (CONTINUED) Voltage, V Symbol Ucc=3V Ucc=6V FM FM 12 TUNE IND 1.6 1.6 4.5 4.5 Equivalent circuit Description
REG 28K 12
Signal level indicator in FM and AM modes
13 15
FM IF IN BAND SELECT
1.28 1.28
0 0
1.28 1.28
0
330 15 13 3K
0
FM IF input Bands switching output: for AM to be connected to commom output, for FM in free state
1K
14 AM IF IN 0 0 0 0
14 2K
input pin of AM IF
16
FM/AM FE OUT
0.4
0.35
0.8
0.35
Output pin of FM IF and AM IF mixers
16 220
17 18 20 FE GND FM RF IN FM RF 0 0.4 1.28 0 0 1.28 0 0.4 1.28 0 0 1.28
20 18 1K 17
3p
Common output of AM RF and FM RF Input of FM RF amplifier Output of FM RF amplifier
FE REG
19 AM RF IN 1.28 1.28 1.28 1.28 Input of AM RF
19 GND
4
ILA1238NS
PINS DESCRIPTION (CONTINUED) Voltage, V Symbol Ucc=3V Ucc=6V FM FM 21 23 REG AFC 1.28 1.28 1.28 1.28 Equivalent circuit Description
21 23 1.28B REG
Output of reference voltage source Output of AFC vericap FM heterodyne output
22
22 FM OSC 1.28 1.28 1.28 1.28
REG
24
24 AM OSC 1.28 1.28 1.28 1.28
REG
AM heterodyne output
1K
26 FM DISCRI 2.0 2.70 3.08 3.80
26
Discriminator connection output
27
VCO
27 28
VCO control output for stereodecoder Reference voltage output for stereo-decoder Common output for stereodecoder
28
MPX REG
1.65
1.65
1.65
1.65
MPX REG
30
GND
0
0
0
0
30
5
ILA1238NS
ELECTRICAL CHARACTERISTICS (Ta=25C, Ucc=6 V) Parameter, Symbol unit 1 Consumption current in AM mode, ICC1 mA 2 Consumption current in FM mode, ICC2 mA 3 FM RF block voltage gain, dB AU1 4 FM IF sensitivity, dBmkV S1 Value Min. 5.0 7.0 28 Max. 12 15 42 31 Test conditions Ucc=6.0 V Ucc=6.0 V Ucc=6.0 V UI=40 dBmkV fI=100 MHz Ucc=6.0 V UI=*1 fI=10.7 MHz Df=22.5 kHz fm=1 kHz UI=*2 fI=10.7 MHz fm=1 kHz UI=*3 fI=10.7 MHz fm=1 kHz fI=10.7 MHz fm=1 kHz UI=90 dBmkV fI=(10.7+0.05) MHz fm=1 kHz UI=60 dBmkV fI=10.7 MHz Ucc=6.0 V UI=245 mV fI=10.7 MHz fm=1 kHz UI=245 mV MONO fm=1 kHz Ucc=6.0 V UI=90 dBmkV fI=10.7 MHz Df=22.5 kHz fm=1 kHz Modulation on R and L channels Ucc=6.0 V UI=90 dBmkV fI=10.7 MHz Df=22.5 kHz fm=1 kHz Ucc=6.0 V UI=90 dBmkV fI=10.7 MHz Df=22.5 kHz fm=1 kHz
5 6 7 8 9 10
FM IF input signal level when switching over "MONO" "STEREO", dBmkV FM IF input signal level when switching over "STEREO" "MONO", dBmkV Automixing, dBmkV FM IF frequency deviation of standard (*4), kHz Output current on tuning indicator output in FM mode, mA Output current on "STEREO" mode indicator output, mA
VI1 VI3 VI2 DF1 IO2 IO1
38 35 1 -50 1.8 1.8
48 46 41 50 7.0 5.0
11 12
Output signal attenuation factor in MUTE mode, dB Channel separation ratio, dB
A1 CdNC
16 30
30 -
13
Output voltage in FM "MONO" mode, mV
UO1
35
138
14
Output voltage in FM "STEREO" mode, mV
UO2
20
138
6
ILA1238NS
ELECTRICAL CHARACTERISTICS (Ta=25C, Ucc=6 V) (continued) Parameter, Symbol Value unit Min. Max. 15 Harmonic factor in FM "MONO" Kh1 2.0 mode, % Test conditions Ucc=6.0 V UI=90 dBmkV fI=10.7 MHz Df=75 kHz fm=1 kHz Ucc=6.0 V UI=90 dBmkV fI=10.7 MHz Df=75 kHz fm=1 kHz UI=60 dBmkV fI=1660 kHz Ucc=6.0 V U=15.5 mV fI=465 kHz fm=1 kHz 30% MOD UI=85 dBmkV fI=465 kHz Ucc=6.0 V UI=85 dBmkV fI=465 kHz fm=1 kHz 30% MOD Ucc=6.0 V UI=95 dBmkV f=1660 kHz fm= 1kHz 30% MOD
16
Harmonic factor in FM "STEREO" mode, %
Kh2
-
2.0
17 18
AM RF voltage gain, dB Sensitivity (*5) of AM IF, dBmkV
AU2 S2
19 15
28 29
19 20
Output current on tuning indicator output in AM mode, mA Output voltage in AM mode, mV
IO3 UO3
1.3 35
7.0 138
21
Harmonic factor in AM mode, %
Kh3
-
2.0
Notes: *1 - Input signal level must be within the limits, that the signal on output makes minus 3 dB of output signal at UI=31.6 . *2 - Input signal level is set equal to 0 mkV and then is raised up to the moment when "STEREO" mode indicator switches on. *3 - Input signal level is set equal to 1 mV and then is reduced to the moment when "STEREO" mode indicator switches off. *4 - Frequency deviation at which voltage constant on output 10 (AGC/AFC2) is equal to the voltage on output 21 (REG), of path central frequency (10.7 MHz). *5 - Sensitivity means that signal level on AM IF input at which voltage on channel outputs is set equal to 15.5 mV (active value)
7
ILA1238NS
TYPICAL APPLICATION CIRCUIT
0.001 C5 L1 R12 220K C10 0.47 C9 10.0 R3 10K 29 PLL LPF 28 MPX REG 27 VCO 26 RV 22K R9* 100 25 24 C1 CF3 C8 3.3 7p C7 L2 C2 2p
C6 10.0 L4 C4 L3 C3 4p R2 2.2K
3p
18p
30 GND R4 2.2K C11 4.7
23 AFC
22 FM OSC
21 REG
20 FM RF
19 AM RF IN
18 FM RF IN
17
16
FM MUTE AM DISCRI OSC
GND FM/AM FE OUT R1
ILA1238NS
ST PILOT PILOT IND PLL DET DET VCO Rch LPF LPF1 LPF2 CHECK OUT 1 R11 220K 2 3 R5 2.2K 4 5 Lch RIPPLE AGC AGC OUT Ucc FILTER AFC1 AFC2 6 7 8 C16 33.0 9 C17 1.0 10 C18 4.7 R8 2.2K C13* 0.022 R6* 3.3K C19 0.01 CF2 GND 11 TUNE IND 12 FM IF IN 13 AM IF BAND IN SELECT 14 C20 0.01 15
150K
C12 1.0
S1 BAND
Rch OUT
R10 330 CF1 IFT
Lch OUT
C14* 0.022
R7* 3.3K
Ucc=3V
C15 100.0
CF1 - filter 465 kHz, CF2 - filter 10.7 MHz, CF3 - piezoelectric discriminator, IFT - matching transformer for 465 kHz (parameters are given above). Fig.10
8

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