The CD22204 complete dual tone mulTIple frequency (DTMF)

receiver detects a selectable group of 12 or 16 standard digits.

No front-end pre-filtering is needed. The only externally

required components are an inexpensive 3.579545MHz TV

‘‘colorburst’’ crystal (for frequency reference) and a bias

resistor. Extremely high system density is possible through

the use of the Alternate TIme Base (ATB) output of a crystal

connected CD22204 receiver to drive the TIme bases of up to

10 addiTIonal receivers. This is a monolithic integrated circuit

fabricated with low power, complementary symmetry CMOS

processing. It only requires a single power supply.

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TM O B S O L E T E P R O D U C T i n t e r s i N O R E C O M M E N D E D R E P L A C E M E N T S u p p o r t C e n t e r a t c o m t s c c o n t a c t o u r T e c h n i c a l 1 8 8 8 I N T E R S I L o r w w w Data Sheet l CD22204 November 2002 FN16965 5V Low Power Subscriber DTMF Receiver The CD22204 complete dual tone multiple frequency DTMF receiver detects a selectable group of 12 or 16 standard digits No frontend prefiltering is needed The only externally required component......