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PDF CXA1538S Data sheet ( Hoja de datos )
| Número de pieza | CXA1538S | |
| Descripción | FM STEREO/AM RADIO | |
| Fabricantes | Sony Corporation | |
| Logotipo |  |
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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
1 page  
CXA1538M/N/S
Electrical Characteristics
Item
Circuit current (1)
Circuit current (2)
Separation
FM MUTE
STEREO
indicator output
FM front end
voltage gain (1)
Symbol
ID1
ID2
SEP
A1
Is
GV1
Test
Point
ID
ID
VD
VD
Is
VA
Output waveform
and Test method
AM no signal V1 to
V5 input
FM no signal short
Separation when VIN3=
50 dBµV, 10.7 MHz, 1 kHz,
22.5 kHz dev input
Attenuation of noise level
When VIN3=no signal,
S8 ON/OFF
VIN3=60 dBµV, 10.7 MHz CW
Pilot ON
VIN1=40 dBµV, 100 MHz CW
VA=10.7 MHz CW
(Ta=25 °C, VCC=6 V)
SW condition
Min. Typ. Max. Unit
1 2 3 4 5 6 8 9 10
A A A B A B OFF A OFF 5.0 8.5 12.0 mA
A 7.0 11.0 15.0 mA
A
B/
B 30 40 — dB
B
ON
AA
/ 16 23 30 dB
OFF
OFF
1.8 3.0 5.0 mA
A 28 35 42 dB
FM detection
(MONO/STEREO)
output level L, R
VD1
VIN3=90 dBµV, 10.7 MHz
VD 1 kHz 22.5 kHz dev
VD=1 kHz sine wave
A
/
B
B
35.0 77.5 138 mVrms
FM-IF
knee level
FM-IF distortion
L, R (MONO)
FM-IF distortion
L, R (STEREO)
VIN3=90 dBµV, 10.7 MHz
VD2 VIN3 Input level at –3 dB of 1 kHz
22.5 kHz dev output
THD1
VD
VIN3=90 dBµV, 10.7 MHz
1 kHz 75 kHz dev
VD=1 kHz sine wave
FM-IF center
frequency
deviation
FM meter
current (1)
∆F1 VF VIN3=90 dBµV, 10.7 MHz CW
IB1 IB VIN3=60 dBµV, 10.7 MHz CW
M/ST switching
VI1 Is VIN3=10.7 MHz
level by IF input
Auto blend
AM front end
voltage gain (2)
AM-IF
voltage gain (4)
VI2
GV2
GV3
AM detection
output level (L, R)
VD3
AM meter
current (2)
AM detection
output distortion
(L, R)
IB2
THD2
VIN3
VIN2=60 dBµV, 1660 kHz CW
VB
VB=455 kHz CW
VIN4 level at output of
VIN4
15.5 mVrms
VIN4=85 dBµV 455 kHz
VD (1 kHz 30 % MOD)
VD=1 kHz sine wave
IB VIN4=85 dBµV, 455 kHz CW
VIN2=95 dBµV, 1660 kHz
VD (1 kHz 30 % MOD)
VD=1 kHz sine wave
A
A
/
B
A
BB
B
A
/
B
A
A
A
—5—
— 25 31 dBµV
— 0.1 2.0 %
0.1 2.0 %
–50 0 +50 kHz
1.8 3.5 7.0 mA
M→ST
38
ST→M
35
1
43
41
10
48 dBµV
46 dBµV
41 dB
A 19 24 28 dB
15 21 29 dBµV
35.0 77.5 138 mVrms
1.3 3.0 7.0 mA
— 0.6 2.0 %
0 dBµV=1 µV
5 Page 
CXA1538M/N/S
2. MPX circuit
1) MPX load resistance
When power supply voltage is over 3 V, change the MPX load resistor R6, R7 from 3.3 kΩ to 6.8 kΩ.
In this case, the output level is increased by about 6 dB.
2) Time constant of de-emphasis
Refer to the following table as the time constant is determined at C13, C14, R6 and R7.
50 µs
75 µs
3.3 kΩ
0.015 µF
0.022 µF
6.8 kΩ
0.0082 µF
0.012 µF
R6, R7
C13, C14
3. AFC circuit
1) This IC has a built-in variable capacitances.
Change to the following circuit when designing J band, because the standard circuit is for W band.
3pF
23 22
9 10
1µ
150k
4.7µ
1µ
2) AFC pull-in range is expanded by increasing the capacitance of standard circuit C7 3 pF.
Adjust the value of capacitance according to the set specification.
4. Auto blend circuit
This IC has a built-in auto blend circuit and a MONO switch is not required as a rule. This circuit controls
the separation in proportion to the signal level and reduces noise automatically for stereo reception below
the mid electric field when the electric field strength reaches lower than about 40 dBµ. When the electric
field strength turns below 10 to 15 dBµ, MONO operation is automatically activated.
To switch MONO mode on externally, ground pin 3 with 33 kΩ.
23
33k
MONO
SW
—11—
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet CXA1538S.PDF ] | |
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