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Sony Semiconductor Electronic Components Datasheet

CXA1538M Datasheet

FM STEREO/AM RADIO

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CXA1538M pdf
CXA1538M/N/S
FM Stereo/AM Radio
For the availability of this product, please contact the sales office.
Description
The CXA1538M/N/S is high performance one-chip
bipolar ICs designed for FM stereo/AM radios.
These include an FM/AM front end, FM/AM IF
amplifier, FM/AM detection output and FM stereo
demodulator output.
CXA1538M
30 pin SOP (Plastic)
CXA1538S
30 pin SDIP (Plastic)
Features
Low current consumption
(In FM mode ID=11.0 mA, in AM mode 8.5 mA,
VCC=6.0 V)
Built-in LED drive circuit for tuning
Built-in LED drive circuit for stereo indicator
Built-in muting circuit for the FM band
Few external parts
CXA1538N
30 pin SSOP (Plastic)
Absolute Maximum Ratings (Ta=25 °C)
Supply voltage
VCC 14 V
Operating temperature Topr –10 to +60 °C
Storage temperature Tstg –55 to +150 °C
Junction temperature Tjmax
125
°C
Allowable power dissipation
PD CXA1538M 500
mW
CXA1538N 410 mW
CXA1538S 1050 mW
Recommended Operating Conditions
Supply voltage
VCC 2 to 9
Structure
Bipolar silicon monolithic IC
V
Block Diagram
GND
30
PLL
LPF 2
29
MPX
REG
28
FM
VCO DISCRI MUTE
27 26 25
AM
OSC
24
AFC
23
FM
OSC
22
REG
21
FM AM RF FM RF FE FM/AM
RF IN IN GND FE OUT
20 19 18 17 16
VCO
M/ST
SW
ST
IND
MULTIPLEX
REGULATOR
REGULATOR
FM FE
AM FE
1/2 COUNTER
PD 1
PD 2
DECODE AMP
MUTING
AUTO
BLEND
BU
AMP
DC
AMP
BU
AMP
FM IF/
DISCRI
AM IF/DET
RIPPLE FILTER
DETUNE
DC
AMP
MUTING
CONTROL
TUNING IND
12345
PLL
LPF1
PILOT
DET
LPF2
PILOT ST
DET IND
LPF2 VCO
CHECK
Rch
OUT
6
Lch
OUT
7 8 9 10 11 12 13 14 15
VCC RIPPLE AGC AGC GND TUNE FM IF AM IF BAND
FILTER AFC 1 AFC 2
IND IN
IN SELECT
PD : PHASE DETECTOR
BU : BUFFER
FE : FRONT END
DET : DETECTOR
IND : INDICATOR
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—
E93313D8X


Sony Semiconductor Electronic Components Datasheet

CXA1538M Datasheet

FM STEREO/AM RADIO

No Preview Available !

CXA1538M pdf
CXA1538M/N/S
Pin Description and Equivalent Circuit
Pin Voltage (V)
No.
Symbol
VCC=3 V VCC=6 V
FM AM FM AM
Equivalent circuit
Description
1 PLL LPF1
29 PLL LPF2
26k
0.97 0.97 0.97 0.97
29
MPX REG
26k
LPF for PLL
1
PILOT
2
DET LPF1
PILOT
3
DET LPF2
0.95 0.95 0.95 0.95
0.95 0.95 0.95 0.95
3
2
LPF’s C (1µF) for PILOT DET
inserted between pins 2 and 3
ST IND
4 1.6 1.6 4.5 4.5
VCO CHECK
MPX REG
6k 4 Stereo indicator drive circuit
and output for VCO check
VCO
5 Rch OUT
0.66 0.66 1.5 1.5
6 Lch OUT
7 VCC
0.66 0.66 1.5 1.5
3.0 3.0 6.0 6.0
Ripple
8
FILTER
2.7 2.7 4.0 4.0
9 AGC/AFC1 1.32 1.15 1.32 1.15
10 AGC/AFC2 1.15 1.47 1.15 1.47
56
17k 17k
8
140k
33k
9
22k 50k
3.25k
25k 10
Stereo Rch output pin
Stereo Lch output pin
Supply pin
Ripple filter
AFC pin in J band, determines time
constant of AGC in AM (depending on
external capacitor).
AFC pin in W band, determines time
constant of AGC in AM (depending
on external capacitor).
—2—


Part Number CXA1538M
Description FM STEREO/AM RADIO
Maker Sony Corporation
Total Page 15 Pages
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