CXA1691BS (Sony Corporation)
FM/AM Radio

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CXA1691BM/BS
FM/AM Radio
For the availability of this product, please contact the sales office.
Description
CXA1691BM/BS is a one-chip FM/AM radio IC
designed for radio-cassette tape recorders.
CXA1691BM
28 pin SOP (Plastic)
CXA1691BS
30 pin SDIP (Plastic)
Features
Small number of peripheral components.
Low current consumption (VCC=3 V)
For FM : ID=5.8 mA (Typ.)
For AM : ID=4.7 mA (Typ.)
Built-in FM/AM select switch.
Large output of AF amplifier.
VCC=6 V, EIAJ output=500 mW (Typ.)
when load impedance 8
Function
FM section
RF amplifier, Mixer and OSC
(incorporating AFC variable capacitor).
IF amplifier
Quadrature detection
Tuning LED driver
AM section
RF amplifier, Mixer and OSC (with RF AGC)
IF amplifier (with IF AGC)
Detector
Tuning LED driver
AF section
Electronic volume control
FM muting
Absolute Maximum Ratings (Ta=25 °C)
Supply voltage
VCC 14 V
Operating temperature Topr –10 to +60 °C
Storage temperature Tstg –50 to +125 °C
Allowable power dissipation
PD 700 mW
(CXA1691BM)
PD 1000 mW
(CXA1691BS)
Recommended Operating Conditions
Supply voltage
VCC 2 to 7.5 V
(CXA1691BM)
VCC 2 to 8.5 V
(CXA1691BS)
Structure
Bipolar monolithic IC
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—
E99215-TE


CXA1691BS (Sony Corporation)
FM/AM Radio

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Block Diagram
CXA1691BM
CXA1691BM/BS
AF
GND OUT
28 27
Ripple AF
VCC FILTER IN
26 25 24
DET AFC AFC IF
OUT AGC AGC GND METER NC
23 22 21 20 19 18
FM
IF IN
17
FM/AM
AM BAND
IF IN SELECT
16 15
AF POWER AMP
AM IF DET AGC
TUNING METER
AM FE
FM
DISCRIMINATOR
FM FE
FM IF
1 2 3 4 5 6 7 8 9 10 11 12 13 14
MUTE FM NF VOL AM AFC FM Reg FM AM NC FM FE FM/AM
DISCRI
OSC
OSC OUT RF RF IN
RF IN GND FE OUT
CXA1691BS
AF
GND GND OUT
30 29 28
Ripple AF
VCC FILTER IN
27 26 25
DET AFC AFC IF
OUT AGC AGC GND METER NC
24 23 22 21 20 19
FM/AM
FM AM BAND
IF IN IF IN SELECT
18 17 16
AF POWER AMP
AM IF DET AGC
TUNING METER
AM FE
FM
DISCRIMINATOR
FM FE
FM IF
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
MUTE NC FM NF VOL AM AFC FM Reg FM AM NC FM FE FM/AM
DISCRI
OSC
OSC OUT RF RF IN
RF IN GND FE OUT
—2—


CXA1691BS (Sony Corporation)
FM/AM Radio

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CXA1691BM/BS
Standard Circuit Design Data
No. Symbol
1
MUTE
(1, 2)
Voltage (V)
VCC=3 V VCC=6 V
FM AM FM AM
0000
2 (3) FM DISCRI 2.18 2.70 4.88 5.43
(The pin numbers in the parenthesis are for CXA1691BS.)
Equivalent circuit
Description
2
1k
1.2k
Phase-shift circuit Connect
ceramic discriminator
3 (4) NF
1.5 1.5 3.0 3.0
27 (28) AF OUT
1.5 1.5 3.0 3.0
4 (5) VOL CONT 1.25 1.25 1.25 1.25
5 (6) AM OSC
1.25 1.25 1.25 1.25
VCC
×100
Negative feedback pin
27
×100
GND Power amplifier output pin
3
4
20k
80k
5
3.6k
Connect variable resistor for
electronic volume control.
GND
AM local oscillation circuit
6 (7) AFC
8 (9) REG OUT
1.25 1.25
1.25 1.25 1.25 1.25
6
7 (8) FM OSC
1.25 1.25 1.25 1.25
7
AFC variable capacitor pin
8
1.25V
(REG) Regulator pin 1.25 V (Typ.)
FM local oscillation circuit
—3—


CXA1691BS (Sony Corporation)
FM/AM Radio

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CXA1691BM/BS
Voltage (V)
No.
Symbol
VCC=3 V VCC=6 V
FM AM FM AM
9 (10) FM RF
1.25 1.25 1.25 1.25
12 (13) FM RF IN
0.3 0 0.3 0
Equivalent circuit
3p
9
8k
12
1k
10 (11) AM RF IN
1.25 1.25 1.25 1.25
VCC
10
Description
Connect FM RF tuning coil
FM RF input pin
AM RF input pin
11 (12) NC
GND
13 (14)
(FE GND)
0000
0000
FM/AM
14 (15)
FE OUT
0.36 0.2 0.36 0.2
AM FM
IF output pin of FM and AM.
220 Connect IF filter.
14
BAND
15 (16)
SELECT
0.84 0 0.88 0
15
VCC
FM and AM bands selection
switch pin. During GND it
becomes AM and during
open it becomes FM.
GND
16 (17) AM IF IN
0000
16
2k
Input pin of AM IF.
17 (18) FM IF IN
1.30 0 1.30 0
17
360
18 (19) NC
0000
—4—
Input pin of FM IF.
GND


CXA1691BS (Sony Corporation)
FM/AM Radio

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CXA1691BM/BS
No. Symbol
19 (20) METER
20 (21) GND
21 (22) AFC/AGC
22 (23) AFC/AGC
23 (24) DET OUT
Voltage (V)
VCC=3 V VCC=6 V
FM AM FM AM
1.6 1.6 4.5 4.5
Equivalent circuit
1.25V
19
×3
N
GND
Description
Meter drive circuit
(For tuning indicator)
0000
1.25 1.49 1.25 1.49
22
1.25 1.25 1.25 1.25
1.25 1.0 1.25 1.0
33k 39k
23
AFC pin of W band.
During AM, it determines
time constant of AGC
AFC pin of J band.
21 During AM, it determines
time constant of AGC.
GND
Detection output pin
24 (25) AF IN
0000
11k
24
×4 ×4
82k
Power amplifier input pin
GND
RIPPLE
25 (26)
FILTER
2.71 2.71 5.4 5.4
25
VCC
17k
Ripple filter
73k
90k
26 (27) VCC
28
GND
(29, 30)
3.0 3.0 6.0 6.0
0000
Power supply pin
Power GND
The pin voltage of pin 6 during AM, it is the same pin voltage of pin 22 (23) during J BAND and is the same
pin voltage of pin 21 (22) during W BAND.
—5—


CXA1691BS (Sony Corporation)
FM/AM Radio

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CXA1691BM/BS
—6—


CXA1691BS (Sony Corporation)
FM/AM Radio

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CXA1691BM/BS
—7—


CXA1691BS (Sony Corporation)
FM/AM Radio

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CXA1691BM/BS
—8—


CXA1691BS (Sony Corporation)
FM/AM Radio

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CXA1691BM/BS
—9—


CXA1691BS (Sony Corporation)
FM/AM Radio

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CXA1691BM/BS
Coil data
AM OSC
3
2
1
S
4
5
6
AM IFT
3
2
1
S
4
5
6
FM RF
Core diameter ø 0.06 mm 2UEW
f (kHz)
796
L (µH)
1 to 3
270
QO
1 to 3
125
Number of widings (t)
1 to 3
4 to 6
107 29
Equivalent to L-5K7-H5 R12-1684X. Mitsumi Electric Co., Ltd.
or 7TRS-8441X TOKO Co., Ltd.
Core diameter ø 0.07 mm UEW
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
Equivalent to 21K7-H5 R12-8558A. Mitsumi Electric Co., Ltd.
or 7MC-7789N TOKO Co., Ltd.
φ 4mm
φ 0.6mm 4.5t
FM OSC
φ 4mm
φ 0.6mm 3.5t
AM bar antenna
Primary
Secondary
f (kHz)
796
L (µH)
650
Primary
91 t
Secondary
20 t
BPF PFWE8
(88 to 108 MHz) Soshin Electric Co., Ltd.
CF1 SFU-455B Murata Mfg. Co., Ltd. Or BFCFL-455 TOKO Co., Ltd.
CF2 SFE10.7MA5 Murata Mfg. Co., Ltd.
CF3 CDA10.7MC1 Murata Mfg. Co., Ltd.
—10—


CXA1691BS (Sony Corporation)
FM/AM Radio

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Package Outline Unit : mm
CXA1691BM
28
28PIN SOP (PLASTIC)
+ 0.4
18.8 – 0.1
15
+ 0.4
2.3 – 0.15
0.15
+ 0.2
0.1 – 0.05
1
0.45 ± 0.1
14
1.27
+ 0.1
0.2 – 0.05
CXA1691BM/BS
CXA1691BS
0.24 M
SONY CODE
EIAJ CODE
JEDEC CODE
SOP-28P-L04
SOP028-P-0375
PACKAGE STRUCTURE
PACKAGE MATERIAL
LEAD TREATMENT
LEAD MATERIAL
PACKAGE MASS
EPOXY RESIN
SOLDER PLATING
42/COPPER ALLOY
0.7g
30PIN SDIP (PLASTIC)
+ 0.4
26.9 – 0.1
30 16
1 15
1.778
0° to 15°
0.5 ± 0.1
0.9 ± 0.15
SONY CODE
EIAJ CODE
JEDEC CODE
SDIP-30P-01
SDIP030-P-0400
Two kinds of package surface:
1.All mat surface type.
2.All mirror surface type.
PACKAGE STRUCTURE
MOLDING COMPOUND EPOXY RESIN
LEAD TREATMENT
SOLDER/PALLADIUM
PLATING
LEAD MATERIAL
COPPER ALLOY
PACKAGE MASS
1.8g
NOTE : PALLADIUM PLATING
This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).
—11—




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