UTC CXA1191
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
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: l
D
=5.3mA (Typ.)
AM: l
D
=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
DIP-28
SOP-28
ABSOLUTE MAXIMUM RATINGS
(Ta=25
C)
PARAMETER
SYMBOL
VALUE
UNIT
Supply voltage
Vcc
9
V
Operating temperature
Topr
-10 ~ +60
C
Storage temperature
Tstg
-50 ~ +125
C
Allowable power dissipation
P
D
700 (SOP-28)
1000 (DIP-28)
mW
UTC CXA1191
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
VALUE
UNIT
Supply voltage
Vcc
2 ~ 7.5 (SOP-28)
V
Vcc
2 ~ 8.5 (DIP-28)
V
BLOCK DIAGRAM
28
27
26
25
24
23
20
18
22
21
19
17
16
15
1
2
3
4
5
6
9
11
7
8
10
12
13
14
AF POWER AMP
AM IF DET AGC
TUNING METER
AM FE
FM DISCRIMINATOR
FM FE
FM IF
MUTE
FM
DISCRI
NF
VOL
AM
OSC
AFC
FM
OSC
RUG
OUT
FM
RF
AM
RF IN
NC
FW
RF IN
FM
GND
FM/AM
IF OUT
GND
AF
OUT
Vcc
RIPPLE
FILTER
AF
IN
DET
OUT
AFC
AQC
AFC
AQC
IF
END
METER
NC
FM
IF IN
AM
IF IN
FM/AM
BAND
SELECT
UTC CXA1191
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
PIN CONFIGURATIONS
VOLTAGE(V)
Vcc=3V
Vcc=6V
PIN
SYMBOL
FM
AM
FM
AM
EQUIVALENT CIRCUIT
DESCRIPTION
1
MUTE
0
0
0
0
2
FM DISCRI
2.18
2.7
4.88
5.43
2
1K
2K
Phase-shift circuit,
Connect ceramic
discriminator.
3
NF
1.5
1.5
3.0
3.0
Negative feedback pin
27
AF OUT
1.5
1.5
3.0
3.0
3
27
X100
X100
GND
Vcc
Power amplifier output pin
4
VOL CONT
1.25
1.25
1.25
1.25
4
GND
20K
80K
Connect variable resistor
for electronic volume
control.
5
AM OSC
1.25
1.25
1.25
1.25
5
3.6K
AM local oscillation circuit
6
AFC
1.25
*
1.25
*
AFC variable capacitor
pin
8
REG OUT
1.25
1.25
1.25
1.25
6
8
1.25V
REG
Regulator pin 1.25V
(Typ.)
7
FM OSC
1.25
1.25
1.25
1.25
7
FM local oscillation circuit
UTC CXA1191
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
4
9
FM RF
1.25
1.25
1.25
1.25
Connect FM RF tuning
coil.
12
FM RF IN
0.3
0
0.3
0
9
12
1.25V
BK
1K
FM RF input pin
10
AM RF IN
1.25
1.25
1.25
1.25
10
Vcc
AM RF input
11
NC
0
0
0
0
13
GND (FE GND)
0
0
0
0
14
FM/AM FE
OUT
0.36
0.2
0.36
0.2
AM
FM
14
220
IF output pin of FM and
AM, Connect IF filter
15
BAND SELECT
0.84
0
0.88
0
15
10K
Vcc
GND
FM and AM bands
selection switch pin.
During GND it becomes
AM and during open it
becomes FM.
16
AM IF IN
0
0
0
0
16
2K
Input pin of AM IF
17
FM IF IN
0.34
0
0.88
0
17
5.6K
GND
24K
24K
360
10
Input pin of FM IF
18
NC
0
0
0
0
UTC CXA1191
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
5
19
METER
1.6
1.6
4.5
4.5
19
GND
N
1.25V
Meter drive circuit
(For tuning indicator)
20
GND
0
0
0
0
21
AFC/AGC
1.25
1.49
1.25
1.49
AFC pin of W band.
During AM, it determines
time constant of AGC.
22
AFC/AGC
1.25
1.25
1.25
1.25
AFC pin of J band.
During AM, it determines
time constant of AGC.
23
DET OUT
1.25
1.0
1.25
1.0
22
GND
21
Detection output pin
24
AF IN
0
0
0
0
24
GND
11K
Power amplifier input pin
25
RIPPLE
FILTER
2.71
2.71
5.4
5.4
25
Vcc
17K
73K
90K
Ripple filter
26
Vcc
3.0
3.0
6.0
6.0
Power supply pin
28
GND
0
0
0
0
Power GND
*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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