CD22203 PDF 데이터시트 검색

DTMF Receivers, Generators CD22202, CD22203 January 1997 5V Low Power DTMF Receiver Description The CD22202 and CD22203 complete dual-tone multiple frequency (DTMF) receivers detect a selectable group of 12 or 16 standard digits. No front-end pre- ltering is needed. The only externally required components are an inexpensive 3.579545MH- TV “colorburst’’ crystal (for frequency reference) and a bias resistor. Extremely high system density is possible through the use of the clock output of a