UTC CXA1191 Datasheet
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
UTC UNISONIC TECHNOLOGIES CO., LTD.
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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
UTC UNISONIC TECHNOLOGIES CO., LTD.
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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
UTC UNISONIC TECHNOLOGIES CO., LTD.
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