RX3140

RX3140 Low Power IF Receiver IC the wireless IC company HiMARK Technology, Inc. reserves the right to change the product described in this datasheet. All information contained in this datasheet is subject to change without prior notice. HiMARK Technology, Inc. assumes no responsibility for the use of any circuits shown in this datasheet. Description The RX3140 is a low power IF receiver IC which is fully compatible with the Toshiba TA31142 IC and is suitable for use as the second IF downconverter in double-conversion paging systems. The RX3140 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 1 V regulator is provided for convenient biasing of off-chip circuitry. Features u u u u u u u u u u 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 1 V regulator 1.1 V low battery alarm SSOP-20 package (0.65 mm pitch) Block Diagram 20 MIX IN 19 VSS 18 REG OUT 17 REG CON 16 ALM 15 FSK OUT 14 CHA RGE 13 BS 12 LPF OUT 11 LPF IN 1.0 V REGULATOR LOW 1-BIT BATTERY COMPARATOR ALARM CHARGE/ DISCHARGE CIRCUIT MIXER QUAD DETECTOR OSCILLATOR IFAMP OSC IN OSC OUT MIX OUT FSK REF IF OUT AF OUT VCC IFIN DEC QUAD 1 2 3 4 5 6 7 8 ...