SM5021 Crystal Oscillator Module IC

  
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The CF8223A is a FSK (Frequency shift keying) decoder and DTMF (Dual Tone multi-frequency) receiver IC. It is fabricated using a CMOS process and features a power-down function for low power dissipation opera- tion. The FSK decoder and DTMF receiver have the same performance characteristics as dedicated ICs that perform the same functions, with th
SM5021 Crystal Oscillator Module IC - schematic

e added benet of an FSK decoder/DTMF receiver auto-select function* using the telephone tip/ring input signal. It also features a ring (call signal) signal detection circuit, making for easy construction of low power dissipation, high-performance Analog telephone-related applications. By Nippon Precision Circuits Inc, (NPC)



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