HT9142

HT9142 FM IF Detector Features · Operating voltage: 1.1V~3.5V · Constant power supply voltage can be generated by externally adding a transistor: VREG=1.0V typ. · Alarm function sensitivity: VALM=1.1V typ. · Low current consumption: ICCQ=1.1mA typ. · Built-in 2nd stage mixer for double conversion method · Mixer operating frequency: 10MHz~50MHz · Built-in low-pass filter and waveform shaping circuit enable the extraction of FSK signals from voice signals · Built-in battery-saving function for longer battery life time · High transmission rate: 1200 bps · 20-pin TSSOP package (0.65mm Pitch) General Description The HT9142 is designed for FM communication system devices. It combines a paging system, mixer, IF limiter, Quadrature detector, operation amplifier, comparator and more. The HT9142 could provide the customer¢s PAGER system with total solution along with Holtek¢s POCSAG Pager Controller series products. The HT9142 can also use on Holtek¢s RF keyboard/mouse applications. Block Diagram M IX I G N D R E G O R E G C A LM .SKO C H G B S LP .O LP .I M ix e r REG . A LA R M .SK CO M P. Q u ic k C h a rg e AM P I. A m p O S C Q uad D et O S C I O S C O M IX O V C C I. IN D E C Pin Assignment O SCI O SCO M IX O VCC I. IN DEC .SKR I. O Q UAD A.O 1 2 0 M IX I 2 19 G N D 3 18 R E G O 4 17 R E G C 5 16 A LM 6 15 .S K O 7 14 C H G 8 13 B S 9 12 LP .O 10 11 LP .I H T9142 2 0 T S S O P -A . S K R I. O Q U A D A . O Rev. 1.00 1 January 30, 2002 HT9142 Pin Descripti...