may 10,2004 njr corporation ver1 100mhz input mixer & 450khz fm/am if demodulator ic NJM2551 ? general description the NJM2551 is a fm if demodulator ic with 450mhz (standard) if input, which operates from 1.8v supply. it includes an oscillator, mixer, limiting amplifier, and fm/am detectors. ? features z z z z low operating voltage 1.8v to 9.0v z z z z low operating current fm2.5ma at v + =2v am4.0ma at v + =2v z z z z operating frequency up to 100mhz (reference value) z z z z if input frequency 450khz (standard) z z z z bipolar technology z z z z package outline ssop20 ? package outline NJM2551v ? block diagram u n d e r d e v e l o p m e n t 16 15 14 13 12 11 10 1 2 4 3 5 6 7 8 osc (b) am if in v+ am dec fm if out am af out amp out fm amp fm det amp osc amp mixer osc (e) mix out am sw rssi out rf agc out mix in 9 17 18 19 20 rssi - + am amp am det gnd fm if in fm af out quad in amp in am agc in agc fm dec page 370
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