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CXA1538M/N/S
FM Stereo/AM Radio
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. 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 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 CXA1538M 30 pin SOP (Plastic) CXA1538S 30 pin SDIP (Plastic)
CXA1538N 30 pin SSOP (Plastic)
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 VCO 27 FM DISCRI MUTE 26 25 AM OSC 24 AFC 23 FM OSC 22 REG 21 FM RF 20 AM RF FM RF IN IN 19 18 FM/AM FE GND FE OUT 17 16
VCO
MULTIPLEX REGULATOR REGULATOR
FM FE
AM FE PD 1 MUTING 1/2 COUNTER PD 2 AUTO BLEND
BU AMP BU AMP DC AMP
FM IF/ DISCRI
AM IF/DET
DECODE AMP M/ST SW
ST IND
RIPPLE FILTER
DC AMP
DETUNE MUTING CONTROL
TUNING IND
1 PLL LPF1
2 PILOT DET LPF2
3 PILOT DET LPF2
4 ST IND VCO CHECK
5 Rch OUT
6 Lch OUT
7 VCC
8
9
10 AGC AFC 2
11 GND
12 TUNE IND
13 FM IF IN
14
15
RIPPLE AGC FILTER AFC 1
AM IF BAND IN SELECT DET : DETECTOR IND : INDICATOR
PD : PHASE DETECTOR BU : BUFFER 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.
--1--
E93313D8X
CXA1538M/N/S
Pin Description and Equivalent Circuit No. Symbol Pin Voltage (V) VCC=3 V VCC=6 V FM AM FM AM Equivalent circuit Description
1
PLL LPF1
26k
MPX REG 26k
0.97 0.97 0.97 0.97 29 PLL LPF2
29 1
LPF for PLL
2
PILOT DET LPF1 PILOT DET LPF2
0.95 0.95 0.95 0.95
3 2
LPF's C (1F) for PILOT DET inserted between pins 2 and 3
3
0.95 0.95 0.95 0.95
MPX REG
4
ST IND VCO CHECK
1.6 1.6 4.5 4.5
6k
4
Stereo indicator drive circuit and output for VCO check
VCO
5
Rch OUT
0.66 0.66 1.5 1.5
5 6
Stereo Rch output pin
6 7
Lch OUT VCC
0.66 0.66 1.5 1.5 3.0 3.0 6.0 6.0
17k
Stereo Lch output pin Supply pin
17k 140k 33k
8
Ripple FILTER
2.7 2.7 4.0 4.0
8
Ripple filter
9
AGC/AFC1
1.32 1.15 1.32 1.15
9 22k 3.25k 50k
10
AGC/AFC2
1.15 1.47 1.15 1.47
25k
10
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--
CXA1538M/N/S
No.
Symbol
Pin Voltage (V) VCC=3 V VCC=6 V FM AM FM AM 0 0 0 0
Equivalent circuit
Description
11
GND
25
GND of FM/AM IF and DET stage Time constant for muting provided
25
MUTE
0.05 0.01 0.05 0.01
11
12
12
TUNE IND
1.6 1.6 4.5 4.5
FM/AM tuning indicator drive circuit
13
FM IF IN 1.35 0 1.35 0
15
33C 13 3k
FM IF input pin
15
BAND SELECT
FM/AM band switching pin : AM at GND and FM at OPEN
1k
14
AM IF IN
0
0
0
0
14 2k
AM IF input pin
AM Block
FM Block
16
FM/AM FE OUIT
0.57 0.2 0.8 0.2
16 220
AM/FM IF output pin to connect with IF filter
17 18 20
FE GND FM RF IN FM RF
0 0.3
0 0
0 0.3
0
20
3p
GND of FM/AM front end FM RF amplifier circuit for FM RF input FM RF amplifier circuit to connect to RF tank circuit
FE REG
0
18 1k 17
1.25 1.25 1.25 1.25
19
AM RF IN
1.25 1.25 1.25 1.25
19
AM RF input to connect to bar antenna
GND
--3--
CXA1538M/N/S
No.
Symbol
Pin Voltage (V) VCC=3 V VCC=6 V FM AM FM AM
Equivalent circuit
Description
21
REG
21
Regulator output 1.25 1.25 1.25 1.25
23 1.25V REG
23
AFC
Variable capacitance for AFC
22
22
FM OSC
1.25 1.25 1.25 1.25
REG
FM local oscillation circuit
24
24
AM OSC
1.25 1.25 1.25 1.25
REG
AM local oscillation circuit
26
26
FM DISCRI
2.30 2.70 3.60 4.00
1k
Phase shift circuit to connect to ceramic discriminator
27
VCO
27 28 MPX REG
VCO control pin for stereo demodulation
28
MPX REG
1.65 1.65 1.65 1.65
Regulator for MPX
30
GND
0
0
0
0
30
GND of MPX block
--4--
CXA1538M/N/S
Electrical Characteristics
Item Circuit current (1) Circuit current (2) Symbol ID1 ID2 Test Point ID ID Output waveform and Test method AM no signal FM no signal V1 to V5 input short 1 A 2 A 3 A SW condition 4 B A A B / B ON A A / OFF OFF B 5 A 6 B 8 OFF 9 A 10 OFF
(Ta=25 C, VCC=6 V)
Min. 5.0 7.0 Typ. 8.5 11.0 Max. 12.0 15.0 Unit mA mA
Separation when VIN3= Separation SEP VD 50 dBV, 10.7 MHz, 1 kHz, 22.5 kHz dev input Attenuation of noise level FM MUTE A1 VD When VIN3=no signal, S8 ON/OFF STEREO indicator output FM front end voltage gain (1) Is Is VIN3=60 dBV, 10.7 MHz CW Pilot ON VIN1=40 dBV, 100 MHz CW VA=10.7 MHz CW
30
40
--
dB
16
23
30
dB
1.8
3.0
5.0
mA
GV1
VA
A
28
35
42
dB
FM detection (MONO/STEREO) output level L, R VD1 VD
VIN3=90 dBV, 10.7 MHz 1 kHz 22.5 kHz dev VD=1 kHz sine wave
A / B B 35.0 77.5 138 mVrms
FM-IF knee level
VIN3=90 dBV, 10.7 MHz VD2 VIN3 Input level at -3 dB of 1 kHz 22.5 kHz dev output A THD1 VD VIN3=90 dBV, 10.7 MHz 1 kHz 75 kHz dev / B -- 0.1 2.0 % A -- 25 31 dBV
FM-IF distortion L, R (MONO)
FM-IF distortion L, R (STEREO)
VD=1 kHz sine wave
0.1
2.0
%
FM-IF center frequency deviation FM meter current (1) F1 VF VIN3=90 dBV, 10.7 MHz CW A -50 0 +50 kHz
IB1
IB
VIN3=60 dBV, 10.7 MHz CW
1.8 MST
3.5
7.0
mA
M/ST switching level by IF input
VI1
Is
VIN3=10.7 MHz
38 STM 35
43
48
dBV
41 10 24
46 41 28
dBV dB dB
Auto blend AM front end voltage gain (2) AM-IF voltage gain (4) AM detection output level (L, R) AM meter current (2) AM detection output distortion (L, R)
VI2 GV2
VIN3 VB VIN2=60 dBV, 1660 kHz CW VB=455 kHz CW VIN4 level at output of 15.5 mVrms VIN4=85 dBV 455 kHz A / B A B B B A
1 19
GV3
VIN4
A
15
21
29
dBV
VD3
VD
(1 kHz 30 % MOD) VD=1 kHz sine wave
35.0
77.5
138
mVrms
IB2
IB
VIN4=85 dBV, 455 kHz CW VIN2=95 dBV, 1660 kHz
1.3
3.0
7.0
mA
THD2
VD
(1 kHz 30 % MOD) VD=1 kHz sine wave
A
--
0.6
2.0
%
0 dBV=1 V --5--
Electrical Characteristics Test Circuit
VIN 2 AM 1660kHz
100 150 43p VH S8 20p 18p 15p 100k 2k 25 MUTE AM OSC AFC FM OSC REG FM RF AM RF IN FM RF IN 24 23 22 21 20 19 18 17 FE GND 3.3 10p 10p 10p 10p 16 FM/AM FE OUT 2200p 30p 2k 330 10p 0.01F S6 10 A 5k 27 VCO FM DISCRI 26 B 100 S9 CF1 25 150H VIN 1 FM 100MHz 0.01
VF
VO
VA
30
29
28
GND
PLL LPF
MPX REG
30p
--6--
Rch OUT VCC 7 100 B 33
0.01
0.47
2.2k
4.7 Lch OUT RIPPLE FILTER 8 1 4.7 9 10 AGC/ AFC 1 AGC/ AFC 2 S2 A 7.5k 7.5k
S10
PLL LPF 4 S1 B A
0.01
PILOT DET LPF1 5 6
PILOT ST IND DET VCO LPF2 CHECK
GND 11
TUNE IND 12
FM IF IN 13
AM IF BAND IN SELECT 14 S4 0.01 IB S3 A B 0.01 A 15 S5 B 2k VS
1
2
3
1 VM 30k 7.5k 15kHz LPF 19kHz notch filter VD IS ID
VIN 3 FM 10.7MHz
VIN 4 AM 455kHz
CXA1538M/N/S
Application Circuit
C5 C6 0.001 10 BPF CF3 RV 22k R3 10k 27 VCO FM MUTE AM DISCRI OSC AFC FM OSC REG FM RF AM RF FM RF GND FM/AM IN IN FE OUT 26 25 24 23 22 21 20 19 18 17 16 IFT CF1 C8 3.3 R9 100 C1 7p R2 2.2k C7 3p C2 2.0p C3 18p L3 L4 L1 L2 C4 4PF
C9 10
R4 2.2k
30
29
28
GND
PLL LPF
MPX REG
C11 4.7 Lch OUT 6 C18 4.7 C16 33 C17 1 R8 2.2k R10 330 C19 0.01 C20 0.01 7 8 9 10 11 12 13 14 15 RIPPLE AGC/ AGC/ TUNE FM IF AM IF BAND IN IN SELECT VCC FILTER AFC 1 AFC 2 GND IND
C10 0.47
PLL LPF 4 R5 2.2k 5
PILOT PILOT ST IND/ DET DET VCO Rch LPF1 LPF2 CHECK OUT
--7--
R6 3.3k R7 3.3k VCC=3V C15 100 CF2
1
2
3
R1 100k
C12 1
R ch OUT
S1
C13 0.022
L ch OUT
C14 0.022
Capacitor unit : F
BPF CF1 CF2 CF3 IFT
: FM BAND PASS FILTER : AM 455kHz CF : FM 10.7MHz CF : FM DISCRIMINATOR : AM 455kHz IFT
Note) This circuit is an application example and is not guaranteed for all applications. For C, R (C13, C14, R6, R7) marked, refer to "2. MPX circuit" of "Notes on Usage."
CXA1538M/N/S
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
CXA1538M/N/S
FM I/O characteristics 0 SIGNAL (STEREO) -10 Separation/response (dB) VCC FREO MODE DEV 3V 98MHz 400Hz 22.5kHz SIGNAL (MONO)
-20
-30 Distortion THD1 (%) Distortion THD2 (%) 60 LR RL
-40
SEPARATION
5 4
-50 NOISE(MONO) -60 10 20 30 NOISE(STEREO) (WITH LPF)
3 2 1 60 70 80 90 100 110
DISTORTION(MONO)
40
50
Input signal level (dBV) AM I/O characteristics 0 SIGNAL -10
VCC 3V FREO 1000kHz MOD 400Hz, 30%
Response (dB)
-20
-30
-40
NOISE
5 4
-50 DISTORTION -60 10 20 30 40 50 60 70 80 Input signal level (dBm) 79 VCO - free-running frequency (kHz) 45 90 100 110
3 2 1
Vin3=90dBV 10.7MHz CW 78
Separation (dB)
77
40 Vin3=90dBV 10.7MHz
76
75
fmod = 1kHz 22.5kHz dev Pilot ON 73 74 75 76 77 78 79 0 20 40 80
VCO - free-running frequency (kHz)
Ta - Ambient temperarure (C)
--8--
CXA1538M/N/S
Coil data AM OSC
S 3 2 1
Core diameter o 0.06 mm 2 UEW
4 5 6
f (kHz) 796
L (H) 1 to 3 270
QO 1 to 3 125
Number of widings (t) 1 to 3 4 to 6 107 29
FM RF
5mm 6mm3.5t
Equivalent to L-5K7H5 R12-1684X, Mitsumi Electric Co., Ltd. or 7TRS-8441 TOKO Co., Ltd.
AM IFT
3 2 1 S
Core diameter o 0.07 mm UEW
4 5 6
CO (pF) 1 to 3 180
QO 1 to 3 90
Number of widings (t) 1 to 2 2 to 3 4 to 6 111 35 7
FM OSC
4mm 0.6mm3.5t
Equivalent to 21K7H5 R12-8558A, Mitsumi Electric Co., Ltd. or 7MC-7789N TOKO Co., Ltd.
FM Discriminator Core diameter o 0.1 mm 2 UEW
3 2 1 4 5 6
CO (pF) 1 to 3 82
QO 1 to 3 95
Number of widings (t) 1 to 3 111
Equivalent to 119ASC-12200Z, TOKO Co., Ltd. AM Bar Antenna f (kHz) 796
SECONDARY
PRIMARY
L (H) 650
Primary 91 t
Secondary 20 t
BPF CF1 CF2 CF3 VC VC (Rear Mount)
PFWE8 (88 to 108 MHz) SFU-455B SFE10.7MA5 CDA10.7MG1 PVC2LXT16L HU22124N700 PVC2LXT16B
Soshin Electric Co., Ltd. Murata Mfg. Co., Ltd. or BFCFL-455 Murata Mfg. Co., Ltd. Murata Mfg. Co., Ltd. Mitsumi Electric Co., Ltd. TOKO Co., Ltd. Mitsumi Electric Co., Ltd. --9-- TOKO Co., Ltd.
CXA1538M/N/S
Notes on Usage 1. VCO free run frequency adjustment method As this IC has built-in oscillation capacitance, the oscillation frequency can be controlled with an external resistor.
27 10k Capacitor for decoupling 22k 28
1) VCO Adjustment Method Pin 4 is the stereo indicator and VCO check pin. Therefore, in stereo mode (when stereo indicator drive Tr Q2 is switched on), pin 4 voltage lowers down, Q1 is cut off and VCO oscillation waveform can not be seen. In AM mode as well, the oscillation waveform can not be seen as VCO turns off. Adjust the free run frequency at 76 kHz 50 Hz.
33k 4 Q1 Q2 about 180mVp-p VCC
In this IC, tuner and MPX sections are directly connected. Therefore, free run frequency is not stable, being affected by noise except in reception mode. For free run adjustment, input signals from either RF or IF. (Input signal should be RF [Tuning frequency] or fo of the discriminator using IF (10.7 MHz) and input more than 60 dB.) 2) How to Deal with pin 4 After Adjustment. With the use of a stereo indicator.
When VCC is 3 V or more, insert a bypass resistance R to prevent LED malfunction.
2.2k 4 R VCC>3V
2.2k 4
VCC=3V
Without the use of a stereo indicator.
4
OPEN
4
Turn pin 4 to open or connect to GND.
3) Control Resistor of VCO Oscillation Frequency For the VCO control resistor of this iC, a carbon film resistor suffices. For easier adjustment of temperature characteristics and VCO free run frequency, the following combination is recommended.
27 10k 28
22k
--10--
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 k to 6.8 k. 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. 3.3 k 0.015 F 0.022 F 6.8 k 0.0082 F 0.012 F R6, R7 C13, C14
50 s 75 s
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 1
10 150k 4.7 1
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 dB. When the electric field strength turns below 10 to 15 dB, MONO operation is automatically activated. To switch MONO mode on externally, ground pin 3 with 33 k.
2 3
33k MONO SW
--11--
CXA1538M/N/S
5. FM discriminator For FM detection, the quadrature detection system is adopted. As a phase shifter, a ceramic resonator (CF 3 discriminator) applies to achieve adjustment-free detection. Though the sensitivity and selectability will be slightly affected, the discriminator can be replaced by a coil as shown below. Combining CF2 (FMIF) and CF3 (PM discriminator) poses problems with the distortion factor when deviation with the IF band central frequency fo occurs. To this effect, use pairs of the same rank as indicated in the chart. fO of CF2 and CF3 10.70 MHz 10.67 MHz 10.73 MHz 10.64 MHz 10.76 MHz
A B C D E
Red Blue Orange Black White
26 22pF DISCRI COIL
6. FM muting circuit This IC has a built-in soft muting circuit. As shown in the following I/O characteristics diagram, 23 dB (Typ.) muting is applied and noise level reduced during weak electric field and out of tune instances.
Conventional IC RESPONSE (dB) 3 -23 S+N IC with built-in soft MUTE
N
INPUT LEVEL (dB)
7. Notes on patterns 1) Positions of FM ANT and OSC coils Locate those at right angles to each others to avoid inductance M through coupling. Further, insert a pin 21 pattern between patterns of pins 22, 20 and coils. 2) Tuning circuit As the capacitances C1 to C4, L2 and L3 are the constants on the standard circuit board, check the constants when a new circuit board is used. 3) Grounding pins Pin 17 is a grounding pin for AM, FM and FE ; pin 11 for IF ; and pin 30 for MPX. Use as thick as possible a pattern since the grounding between ANT IN, BPF and pin 17 significantly stability, NF and characteristics affects.
BPF ANT IN
18
17
16
4) Ground bypass capacitors C5 (0.001 F) and C6 (10 F) connected to pin 21 as close as possible to pin 17. --12--
CXA1538M/N/S
CXA1538M
CXA1538S
--13--
CXA1538M/N/S
Package Outline CXA1538M
Unit : mm
30PIN SOP(PLASTIC)
+ 0.4 2.3 - 0.15 0.1 16
+ 0.4 18.8 - 0.1 30
10.3 0.4
+ 0.3 7.6 - 0.1
+ 0.2 0.1 - 0.05
(9.3)
15 1 0.45 0.1 1.27 0.2 M + 0.1 0.2 - 0.05
0 to 10
DETAIL A
PACKAGE STRUCTURE
PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE SOP-30P-L03 SOP030-P-0375 LEAD TREATMENT LEAD MATERIAL PACKAGE MASS EPOXY RESIN SOLDER PLATING COPPER ALLOY 0.7g
CXA1538N
9.7 0.1
30PIN SSOP (PLASTIC)
+ 0.2 1.25 - 0.1
0.5 0.2
0.10 0.1 0.1
EPOXY RESIN SOLDER/PALLADIUM PLATING 42/COPPER ALLOY 0.1g
A
30
16
5.6 0.1
A
1 + 0.1 0.22 - 0.05 0.13 M
15 0.65 + 0.05 0.15 - 0.02
0 to 10 NOTE: Dimension "" does not include mold protrusion. DETAIL A
PACKAGE STRUCTURE
PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE SSOP-30P-L01 SSOP030-P-0056 LEAD TREATMENT LEAD MATERIAL PACKAGE MASS
NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). --14--
0.5 0.2
7.6 0.2
CXA1538M/N/S
CXA1538S
30PIN SDIP (PLASTIC)
+ 0.4 26.9 - 0.1
30
16
+ 0.3 8.5 - 0.1
+ 0.1 05 0.25 - 0.
1 1.778
15
0.5 MIN
+ 0.4 3.7 - 0.1
10.16
0 to 15
Two kinds of package surface: 1.All mat surface type. 2.All mirror surface type.
0.5 0.1 0.9 0.15
PACKAGE STRUCTURE
MOLDING COMPOUND SONY CODE EIAJ CODE JEDEC CODE SDIP-30P-01 SDIP030-P-0400 LEAD TREATMENT LEAD MATERIAL PACKAGE MASS EPOXY RESIN SOLDER/PALLADIUM PLATING COPPER ALLOY 1.8g
NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).
--15--
3.0 MIN

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