UNISONIC TECHNOLOGIES CO., LTD
CXA1191
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.
LINEAR INTEGRATED CIRCUIT
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
Lead-free:
CXA1191L
Halogen-free:CXA1191G
ORDERING INFORMATION
Normal
CXA1191-D28-T
CXA1191-S28-R
CXA1191-S28-T
Ordering Number
Lead Free Plating
CXA1191L-D28-T
CXA1191L-S28-R
CXA1191L-S28-T
Halogen Free
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.B
CXA1191
PIN CONFIGURATIONS
PIN
1
DESCRIPTION
SYMBOL
MUTE
LINEAR INTEGRATED CIRCUIT
VOLTAGE(V)
V
CC
=3V
V
CC
=6V
FM
AM
FM
AM
0
0
0
0
EQUIVALENT CIRCUIT
2
Phase-shift circuit, Connect
ceramic discriminator.
FM DISCRI
2.18
2.7
4.88
5.43
3
Negative feedback pin
NF
1.5
1.5
3.0
3.0
Vcc
X100
27
X100
27
Power amplifier output pin
AF OUT
1.5
1.5
3.0
3.0
GND
3
4
Connect variable resistor for
VOL CONT
electronic volume control.
1.25
1.25
1.25
1.25
5
AM local oscillation circuit
AM OSC
1.25
1.25
1.25
1.25
6
8
AFC variable capacitor pin
Regulator pin 1.25V (Typ.)
AFC
REG OUT
1.25
1.25
Note
1.25
1.25
1.25
Note
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
11
13
AM RF input
AM RF IN
NC
GND
(FE GND)
1.25
0
0
1.25
0
0
1.25
0
0
1.25
0
0
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QW- R110-014.B
CXA1191
PIN CONFIGURATIONS(Cont.)
PIN
DESCRIPTION
SYMBOL
LINEAR INTEGRATED CIRCUIT
VOLTAGE(V)
V
CC
=3V
V
CC
=6V
FM
AM
FM
AM
EQUIVALENT CIRCUIT
14
IF output pin of FM and AM,
Connect IF filter
FM/AM
FE OUT
0.36
0.2
0.36
0.2
Vcc
15
FM and AM bands selection
switch pin.
During GND it becomes AM
and during open it becomes
FM.
BAND
SELECT
0.84
0
0.88
0
15
10K
GND
16
16
Input pin of AM IF
AM IF IN
0
0
0
0
2K
17
Input pin of FM IF
FM IF IN
0.34
0
0.88
0
18
NC
0
0
0
0
19
19
Meter drive circuit
(For tuning indicator)
1.25V
METER
1.6
1.6
4.5
4.5
N
GND
20
21
AFC pin of W band.
During AM, it determines
time constant of AGC.
AFC pin of J band.
During AM, it determines
time constant of AGC.
Detection output pin
GND
AFC/AGC
0
1.25
0
1.49
0
1.25
0
22
1.49
22
23
AFC/AGC
DET OUT
1.25
1.25
1.25
1.0
1.25
1.25
1.25
1.0
24
11K
21
GND
24
Power amplifier input pin
AF IN
0
0
0
0
GND
25
Ripple filter
RIPPLE
FILTER
2.71
2.71
5.4
5.4
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QW- R110-014.B
CXA1191
PIN CONFIGURATIONS(Cont.)
PIN
6
28
Note:
LINEAR INTEGRATED CIRCUIT
VOLTAGE(V)
DESCRIPTION
SYMBOL
EQUIVALENT CIRCUIT
V
CC
=3V
V
CC
=6V
FM
AM
FM
AM
Power supply pin
V
CC
3.0
3.0
6.0
6.0
Power GND
GND
0
0
0
0
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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QW- R110-014.B
CXA1191
BLOCK DIAGRAM
GND
28
AF
OUT
27
Vcc
26
RIPPLE
FILTER
25
AF
IN
24
DET
OUT
23
AFC
AQC
22
AFC
AQC
21
LINEAR INTEGRATED CIRCUIT
IF
END
20
METER
19
NC
18
FM
IF IN
17
AM
IF IN
16
FM/AM
BAND
SELECT
15
AM IF DET AGC
AF POWER AMP
TUNING METER
AM FE
FM IF
FM DISCRIMINATOR
FM FE
1
MUTE
2
FM
DISCRI
3
NF
4
VOL
5
AM
OSC
6
AFC
7
FM
OSC
8
RUG
OUT
9
FM
RF
10
AM
RF IN
11
NC
12
FW
RF IN
13
FM
GND
14
FM/AM
IF OUT
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QW- R110-014.B