TA31142

UTC TA31142 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 IFIN DEC FSKREF IFOUT QUAD AFOUT 4 5 6 7 8 9 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 TA31142 NUMBER SYMBOL 1 2 3 LINEAR INTEGRATED CIRCUIT DESCRIPTION NUMBER SYMBOL 11 12 13 DESCRIPTION OSCIN Oscillator input (base) OSCOUT Oscillator output (emitter) MIXOUT Mixer output (2KΩ output impedance) 4 VCC Nominal 1.4V supply 14 5 6 7 8 IFIN DEC FSKREF IFOUT IF amplifier input (2KΩ input impedance) IF amplifier de-coupling capacitor connection 1-bit comparator reference input (requires external capacitor) IF amplifier output 15 16 17 18 9...