Document
UNISONIC TECHNOLOGIES CO., LTD
CXA1191
LINEAR INTEGRATED CIRCUIT
FM/AM Radio
DESCRIPTION
The UTC CXA1191 is a one-chip FM/AM radio IC designed for radio-cassette tape recorders and headphone tape recorders.
FEATURES
*Small number of peripheral components *Low current consumption (Vcc=3V) –FM: lD=5.3mA (Typ.) –AM: lD=3.4mA (Typ.) *Built-in FM/AM select switch *Large current of AF amplifier
FUNCTIONS
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
Structure Bipolar silicon monolithic IC
ORDERING INFORMATION
Ordering Number CXA1191G-D28-T CXA1191G-S28-R CXA1191G-S28-T
Package DIP-28 SOP-28 SOP-28
Packing Tube
Tape Reel Tube
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QW- R110-014.C
CXA1191
MARKING
PACKAGE DIP-28
SOP-28
LINEAR INTEGRATED CIRCUIT
MARKING
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QW- R110-014.C
CXA1191
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATIONS
PIN DESCRIPTION SYMBOL 1 MUTE
VOLTAGE(V)
VCC=3V
VCC=6V
FM AM FM AM
0000
EQUIVALENT CIRCUIT
2 Phase-shift circuit, Connect FM DISCRI 2.18 2.7 4.88 5.43 ceramic discriminator.
3 Negative feedback pin
NF 1.5 1.5 3.0 3.0
27 Power amplifier output pin
AF OUT 1.5 1.5 3.0 3.0
4 Connect variable resistor for VOL CONT 1.25 1.25 1.25 1.25 electronic volume control.
5 AM local oscillation circuit
AM OSC 1.25 1.25 1.25 1.25
6 AFC variable capacitor pin 8 Regulator pin 1.25V (Typ.)
AFC
1.25 Note 1.25 Note
REG OUT 1.25 1.25 1.25 1.25
7 FM local oscillation circuit
FM OSC 1.25 1.25 1.25 1.25
9 Connect FM RF tuning coil. FM RF 1.25 1.25 1.25 1.25
12 FM RF input pin
FM RF IN 0.3 0 0.3 0
10 AM RF input
11 13
10
AM RF IN 1.25 1.25 1.25 1.25
Vcc
NC 0 0 0 0
GND (FE GND)
0
0
0
0
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QW- R110-014.C
CXA1191
PIN CONFIGURATIONS(Cont.)
PIN DESCRIPTION SYMBOL
LINEAR INTEGRATED CIRCUIT
VOLTAGE(V)
VCC=3V
VCC=6V
FM AM FM AM
EQUIVALENT CIRCUIT
IF output pin of FM and AM, FM/AM
14 Connect IF filter
FE OUT 0.36 0.2 0.36 0.2
FM and AM bands selection
switch pin.
BAND
15 During GND it becomes AM and during open it becomes
SELECT
0.84
0
0.88
0
FM.
16 Input pin of AM IF
AM IF IN
0
0
0
0
Vcc
10K 15
GND
16 2K
17 Input pin of FM IF
FM IF IN 0.34 0 0.88 0
18
19
Meter drive circuit (For tuning indicator)
NC 0 0 0 0
1.25V
METER 1.6 1.6 4.5 4.5
20 AFC pin of W band.
21 During AM, it determines time constant of AGC. AFC pin of J band.
22 During AM, it determines time constant of AGC.
23 Detection output pin
24 Power amplifier input pin
GND
0000
AFC/AGC 1.25 1.49 1.25 1.49
22
AFC/AGC 1.25 1.25 1.25 1.25
DET OUT 1.25 1.0 1.25 1.0
11K 24
AF IN 0 0 0 0
19 N
GND
21 GND
GND
25 Ripple filter
RIPPLE FILTER
2.71 2.71
5.4
5.4
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4 of 8
QW- R110-014.C
CXA1191
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATIONS(Cont.)
VOLTAGE(V)
PIN
DESCRIPTION
SYMBOL
VCC=3V
VCC=6V
EQUIVALENT CIRCUIT
FM AM FM AM
6 Power supply pin
VCC 3.0 3.0 6.0 6.0
28 Power GND
GND
0000
Note: The pin voltage of pin 6 during AM, it is the same pin voltage of pin22 (23) during J BAND and is the same pin
voltage of pin 21 (22) during W BAND.
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5 of 8
QW- R110-014.C
CXA1191
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
GND 28
AF OUT
27
Vcc
RIPPLE FILTER
AF IN
26 25 24
DET OUT
23
AFC AQC
22
AFC AQC
21
IF END
METER
20 19
NC 18
FM IF IN
17
AM IF IN
16
FM/AM BAND SELECT
15
AF POWER AMP
AM IF DET AGC AM FE
TUNING METER
FM IF
FM DISCRIMINATOR FM FE
1 23
MUTE
FM DISCRI
NF
4 VOL
5
AM OSC
6 AFC
7
FM OSC
8
RUG OUT
9 10
FM AM RF RF IN
11 NC
12
FW RF IN
13 14
FM FM/AM GND IF OUT
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QW- R110-014.C
CXA1191
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Ta =25C)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC 9 V
Power Dissipation
DIP-28 SOP-28
PD
1000 700
mW mW
Junction Temperature
TJ
+150
C
Operating Temperature
TOPR
0 ~ +70
C
Storage Temperature
TSTG
-40 ~ +150
C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
RECOMMENDED OPERATING CONDITIONS
Supply Voltage
PARAMETER
DIP-28 SOP-28
SYMBOL VCC
RATINGS 2 ~ 8.5 2 ~ 7.5
UNIT V V
ELECTRICAL CHARACTERISTICS (Ta=25C, Vcc=6V)
PARAMETER
SW TEST SYMBOL CONDITIONS POINT
123456
CONDITIONS
MIN TYP MAX UNIT
AM Circuit Current
ID1 A B A A A A IA No signal, AM
- 3.5 10.0 mA
FM Circuit Current
ID2 A B A A B A IA No signal, FM
- 7.0 14.0 mA
FM Front End Voltage Gain
GV1 A B A.