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31142 Datasheet

TA31142

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UTCTA31142 LINEAR INTEGRATED CIRCUIT
LOW POWER IF RECEIVER IC
DESCRIPTION
The UTC TA31142 is a low power IF receiver IC
and is suitable for use as the second IF
downconverter in double-conversion paging systems.
It is well-suited for POCSAG paging applications and
incorporates a 2-level FSK demodulator consisting of
a quadrature FM demodulator, on-chip bit-rate filter,
and 1-bit comparator. An on-chip 1V regulator is
provided for convenient biasing of off-chip circuitry.
FEATURES
*Extremely low power operation with power-down
feature
*Built-in crystal oscillator for mixer local oscillator
*Mixer input frequency: 10-50 MHz
*Quadrature detector
*On-chip bit-rate filter
*Audio output
*1-bit comparator with open collector output
*1V regulator
*1.1V low battery alarm
TSSOP-20
PIN CONFIGURATIONS
OSCIN 1
OSCOUT 2
MIXOUT 3
VCC 4
IFIN 5
DEC 6
FSKREF 7
IFOUT 8
QUAD 9
AFOUT 10
11 LPFIN
12 LPFOUT
13 BS
14 CHARGE
15 FSKOUT
16 ALM
17 REGCON
18 REGOUT
19 VSS
20 MIXIN
UTC UNISONIC TECHNOLOGIES CO., LTD. 1
QW-R103-015,A




UTC

31142 Datasheet Preview

31142 Datasheet

TA31142

No Preview Available !

www.DataSheet4U.com
UTCTA31142 LINEAR INTEGRATED CIRCUIT
NUMBER SYMBOL
DESCRIPTION
NUMBER SYMBOL
DESCRIPTION
1 OSCIN Oscillator input (base)
11 LPFIN LPF operational amplifier input
2 OSCOUT Oscillator output (emitter)
12 LPFOUT LPF operational amplifier output
3 MIXOUT Mixer output (2Koutput
13 BS Two-state logic input to control
impedance)
receiver power up/down.
(BS=high=normal operation;
BS=low=stand-by mode)
4 VCC Nominal 1.4V supply
14 CHARGE Two-state logic input to control
charge-discharge circuit.
(CHARGE=high=fast charge;
CHARGE=low=slow charge)
5 IFIN IF amplifier input (2Kinput
15 FSKOUT Open collector NRZ comparator
impedance)
output (requires pull-up resistor)
6
DEC IF amplifier de-coupling capacitor 16
ALM Open collector low battery alarm
connection
output (requires pull-up resistor)
7
FSKREF 1-bit comparator reference input
17 BEGCON 1.0V regulator control output for
(requires external capacitor)
connection to external PNP base
8 IFOUT IF amplifier output
18 REGOUT 1.0V regulator input for
connection to external PNP
collector
9
QUAD Quadrature FM demodulator input 19
VSS Ground
10 AFOUT Quadrature FM demodulator
20 MIXIN Mixer input (5Kinput
output
impedance)
ABSOLUTE MAXIMUM RATINGS (Vss=0V )
PARAMETER
SYMBOL
Supply Voltage
Vcc
Operating temperature range
TOPR
Storage temperature range
TSTG
Soldering temperature range
TSLD
Soldering time range
tSLD
VALUE
Vss-0.3 to Vss+3.5
-30 to 85
-55 to 150
255
10
UNIT
V
°C
°C
°C
s
RECOMMENDED OPERATING CONDITIONS (Vss=0V)
PARAMETER
SYMBOL
VALUE
Min. Typ.
Supply voltage range
Vcc 1.1 1.35
MIXIN input frequency
fMIXIN
Operating temperature
TA -10 25
Max.
1.6
50
60
UNIT
V
MHz
°C
UTC UNISONIC TECHNOLOGIES CO., LTD. 2
QW-R103-015,A


Part Number 31142
Description TA31142
Maker UTC
Total Page 6 Pages
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