CXA1538M/N/S
FM Stereo/AM Radio
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Description
CXA1538M
CXA1538S
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.
30 pin SOP (Plastic)
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)
CXA1538N
• 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
30 pin SSOP (Plastic)
Absolute Maximum Ratings (Ta=25 °C)
• Supply voltage
VCC
14
V
• Operating temperature Topr
–10 to +60
°C
• Storage temperature
• Junction temperature
Tstg –55 to +150 °C
Tjmax
125
°C
Recommended Operating Conditions
• Allowable power dissipation
CXA1538M
Supply voltage
VCC
2 to 9
V
PD
500
410
1050
mW
mW
mW
CXA1538N
CXA1538S
Structure
Bipolar silicon monolithic IC
Block Diagram
PLL
MPX
FM
AM
FM
FM
RF
AM RF FM RF
FE
FM/AM
GND LPF 2 REG
VCO DISCRI MUTE OSC
AFC
23
OSC
REG
21
IN
IN
GND FE OUT
30 29 28
27
26
25
24
22
20
19
18
17 16
MULTIPLEX
REGULATOR
FM FE
AM FE
VCO
REGULATOR
PD 1
PD 2
MUTING
1/2 COUNTER
DC
AMP
FM IF/
DISCRI
AUTO
BLEND
BU
AMP
BU
AMP
AM IF/DET
DECODE AMP
M/ST
SW
DETUNE
MUTING
CONTROL
ST
IND
RIPPLE FILTER
TUNING IND
13
DC
AMP
1
2
3
4
5
6
7
8
9
10
11
12
14
15
PLL PILOT PILOT
ST
Rch
OUT
Lch
OUT
VCC RIPPLE AGC
AGC
GND TUNE FM IF AM IF BAND
IND IN IN SELECT
LPF1
DET
DET
IND
FILTER AFC 1 AFC 2
LPF2
LPF2
VCO
CHECK
PD : PHASE DETECTOR
BU : BUFFER
DET : DETECTOR
IND : INDICATOR
FE : FRONT END
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.
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