Document
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 АМ 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
BLOCK DIAGRAM
PACKAGE 30-pin mini-DIP TA = -10°...+70° C
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
VCO
MULTIPLEX REGULATOR
1/2
PD1
COUNTER PD2
DECODE AMP
REGULATOR
FM FE AM FE
MUTING
BU AMP
AUTO BLEND
DC AMP
BU AMP
FM IF DISCRI
AM IF DET
M/ST DC SW AMP
RIPPLE FILTER
DC AMP
DETUNE TUNING IND MUTING CONTROL
1 2 3 4 5 6 7 8 9 10 11 12 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
Value
Unit
10
V
-10 ... +70
°C
-55 ... +150
°C
125
°C
500
mW
RECOMMENDED OPERATION CONDITIONS
Symbol
Parameter
Ucc
Supply voltage
Value
Unit
2.0 ... 9.0
V
PINS DESCRIPTION
Voltage, V
№ Symbol
Ucc=3V
Ucc=6V
FM АМ FM АМ
1 PLL LPF1 0.86 0.86 0.86 0.86
29 PLL LPF2 0.86 0.86 0.86 0.86
Equivalent electrical circuit
Description
26K 29
MPX REG 26K
Low frequency filter for VCO phase selftuning
circuit
1
2 PILOT DET 0.95 0.95 0.95 0.95
LPF1
©
3
3 PILOT DET 0.95 0.95 0.95 0.95
LPF2
2
Pins for connecting capacitance of low frequency filter of pilot tone
detector
4
ST IND
1.6 1.6 4.5 4.5
VCO CHECK
MPX REG
Pin of indicator of
13K
4
"STEREO" mode
and frequency
control 76 kHz
VCO
2
ILA1238NS
PINS DESCRIPTION (CONTINUED)
Voltage, V
№ Symbol
Ucc=3V
Ucc=6V
FM АМ FM АМ
Equivalent circuit
5 Rch OUT 1.25 1.45 1.35 2.0
5
6
6 Lch OUT 1.25 1.45 1.35 2.0
Description
Right channel pin Left channel pin
7
Ucc
3.0 3.0 6.0 6.0
Supply
17K
8
Ripple
2.5 2.5 4.0 4.0
FILTER
8
17K
130K 33K
Internal voltage source filter
9 AGC/AFC1 1.47 1.15 1.47 1.15 10 AGC/AFC2 1.15 1.47 1.15 1.47
22K 9 50K 5.3K 25K
50K 10
Pins of heterodyne AFC filter for FM path and AGC for AM
path
11
GND
0
0
0
0
25
MUTE
0.05 0.1 0.05 0.1
11
Common output
of paths IF FM,
25
IF AM and
detectors
Connection pin of muting time constant capacitance
3
ILA1238NS
PINS DESCRIPTION (CONTINUED)
Voltage, V
№ Symbol
Ucc=3V
Ucc=6V
FM АМ FM АМ
Equivalent circuit
12 TUNE IND 1.6 1.6 4.5 4.5
REG 28K
12
Description
Signal level indicator in FM and AM modes
13 FM IF IN 1.28 0 1.28 0
15
BAND
1.28 0 1.28 0
SELECT
14 AM IF IN
0
0
0
0
330
15
13
3K
1K 14
2K
FM IF input Bands switching output: for AM to be connected
to commom output, for FM -
in free state
input pin of AM IF
16
FM/AM
FE OUT
0.4 0.35 0.8 0.35
17 FE GND
0
0
0
0
20
18 FM RF IN 0.4 0 0.4 0 18
20
FM RF
1.28 1.28 1.28 1.28
17
19 AM RF IN 1.28 1.28 1.28 1.28 19
220 3p
1K
Output pin of FM IF and AM IF mixers
16
Common output of AM RF and
FM RF Input of FM RF
amplifier Output of FM RF
amplifier
FE REG
Input of AM RF
GND
4
ILA1238NS
PINS DESCRIPTION (CONTINUED)
Voltage, V
№ Symbol
Ucc=3V
Ucc=6V
FM АМ FM АМ
21
REG
1.28 1.28 1.28 1.28
23
AFC
Equivalent circuit
21
23
1.28B REG
Description
Output of reference voltage
source Output of AFC
vericap
22
22 FM OSC 1.28 1.28 1.28 1.28
REG
FM heterodyne output
24
24 AM OSC 1.28 1.28 1.28 1.28
REG
AM heterodyne output
26 FM DISCRI 2.0 2.70 3.08 3.80
1K 26
Discriminator connection output
27
VCO
28 MPX REG 1.65 1.65 1.65 1.65
30
GND
0
0
0
0
27 28 MPX REG
30
VCO control output for stereo-
decoder
Reference voltage output for stereo-decoder
Common output for stereodecoder
5
ILA1238NS
ELECTRICAL CHARACTERISTICS (Ta=25°C, Ucc=6 V)
.