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UTC 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
SOP-28
DIP-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
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UTC CXA1191 LINEAR INTEGRATED CIRCUIT
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
AF
GND
OUT
28 27 26 25 24 23 20 1822 21 19 17 16 15
Vcc
RIPPLE
FILTERAFIN
DET
OUT
AFC
AQC
AFC
AQCIFEND
METER NC
FM
IF INAMIF IN
FM/AM
BAND
SELECT
AF POWER AMP
1 2 3 4 5 6 9 117 8 10 12 13 14
MUTE
FM
DISCRI
NF VOL
AM
OSC
AM IF DET AGC
FM DISCRIMINATOR
FM
AFC
OSC
AM FE
FM FE
RUG
OUTFMRFAMRF IN
TUNING METER
NC
FM IF
FW
RF INFMGND
FM/AM
IF OUT
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UTC CXA1191 LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATIONS
PIN SYMBOL
1 MUTE 0 0 0 0
2 FM DISCRI 2.18 2.7 4.88 5.43
3 NF 1.5 1.5 3.0 3.0 Negative feedback pin
27 AF OUT 1.5 1.5 3.0 3.0
VOLTAGE(V)
Vcc=3V Vcc=6V
FM AM FM AM
EQUIVALENT CIRCUIT DESCRIPTION
2
1K
2K
3
Phase-shift circuit,
Connect ceramic
discriminator.
Vcc
X100
Power amplifier output pin
27
X100
GND
6
5
7
4
3.6K
Connect variable resistor
20K
80K
for electronic volume
control.
GND
AM local oscillation circuit
8
pin
1.25V
Regulator pin 1.25V
REG
(Typ.)
FM local oscillation circuit
4 VOL CONT 1.25 1.25 1.25 1.25
5 AM OSC 1.25 1.25 1.25 1.25
6 AFC 1.25 * 1.25 * AFC variable capacitor
8 REG OUT 1.25 1.25 1.25 1.25
7 FM OSC 1.25 1.25 1.25 1.25
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UTC CXA1191 LINEAR INTEGRATED CIRCUIT
9 FM RF 1.25 1.25 1.25 1.25 Connect FM RF tuning
12 FM RF IN 0.3 0 0.3 0
10 AM RF IN 1.25 1.25 1.25 1.25
9
coil.
1.25V
12
BK
1K
10
FM RF input pin
AM RF input
Vcc
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
IF output pin of FM and
AM, Connect IF filter
220
14
15 BAND SELECT 0.84 0 0.88 0
10K
15
Vcc
FM and AM bands
selection switch pin.
During GND it becomes
AM and during open it
becomes FM.
GND
16 AM IF IN 0 0 0 0
17 FM IF IN 0.34 0 0.88 0
16
2K
Input pin of AM IF
Input pin of FM IF
10
17
24K24K360
5.6K
GND
18 NC 0 0 0 0
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UTC CXA1191 LINEAR INTEGRATED CIRCUIT
19 METER 1.6 1.6 4.5 4.5
Meter drive circuit
(For tuning indicator)
19
1.25V
N
GND
20 GND 0 0 0 0
24
22
11K
During AM, it determines
time constant of AGC.
During AM, it determines
21
time constant of AGC.
Detection output pin
GND
Power amplifier input pin
GND
21 AFC/AGC 1.25 1.49 1.25 1.49 AFC pin of W band.
22 AFC/AGC 1.25 1.25 1.25 1.25 AFC pin of J band.
23 DET OUT 1.25 1.0 1.25 1.0
24 AF IN 0 0 0 0
17K
73K
90K
Vcc
Ripple filter
25 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.
2.71 2.71 5.4 5.4
25
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UTC CXA1191 LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (Ta=25°C,Vcc=6V)
NO ITEM SYMBOL SW
CONDITIONS
1 2 3 4 5 6
1 AM circuit current ID1 A B A A A A IA No signal, AM - 3.5 10.0 mA
2 FM circuit current ID2 A B A A B A IA No signal, FM - 7.0 14.0 mA
3 FM front end voltage gain GV1 A B A A B A VA V
4 FM detection output level VD1 A - - A B A VD V
5 FM IF knee level VD2 A - - A B A VD V
6 FM detection output distortion
factor
7 FM meter current IB1 A - - A B A IM V
8 AM front end voltage gain GV2 A A A A A A VB V
9 AM IF voltage gain GV3 A A - A A A VD V
10 AM detection output level VD3 A A - A A A VD V
11 AM meter current IB2 A A - A A A IM V
12 AM detection output distortion
factor
13 Audio voltage gain GV4 A - - - - B VE V
14 Audio distortion factor THD3 A - - - - B VE Distortion factor for
15 Muting level VD4 A - - - - B VE Muting level for 50 mW
THD1 A - - A B A VD V
THD2 A A B B A A VD V
TEST
POINT
IN1
IN3
kHz,22.5kHz DEV)
IN3
down from
V
IN3
kHz,22.5kHz DEV)
IN3
kHz,75kHz DEV)
IN3
IN3
IN3 w
(1kHz, 30% MOD) output
is – 34dBm
IN3
(1kHz, 30% MOD)
IN3
(1kHz, 30% MOD)
IN2
(1kHz, 30%
MOD),Vcc=7,8V
IN3
V
IN4
output of 50mVV
V
IN3
V
IN4
output
V
IN4
V
IN3
CONDITIONS MIN TYP MAX UNIT
=40dBµV,100MH
=90dBµV,10.7 MHZ (1
level at a point 3 dB
32 39 46 dB
Z
39 77.5 155 Vrms
- 24 32 dBµV
=90dBµV,10.7 MHZ (1
=90dBµV,10.7 MHZ (1
- 0.3 2.0 %
=60dBµV,10.7 MHZ1.8 3.5 7.0 mA
=60dBµV,1660 kHZ15 22 29 dB
hen 455kHz
=85dBµV,455kH
=85dBµV,455kH
=60dBµV,1660kH
=60dBµV,10.7MH
=-30dBµV,1kH
14 20 27 dBµV
39 77.5 155 Vrms
Z
1.3 3.0 7.0 mA
Z
- 0.6 2.0 %
Z
27 31.5 36 dB
Z
Z
- 0.3 2.5 %
=60dBµV,10.7MH
=-20dBµ m,1kH
Z
Z
8 15 22 dB
=-20dBm,1kH
Z
OFF
0dBµV=1µV
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UTC CXA1191 LINEAR INTEGRATED CIRCUIT
APPLICATION CIRCUIT
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