CD22204 Overview
CD22204 Data Sheet February 1999 File Number 1696.4 5V Low Power Subscriber DTMF Receiver The CD22204 plete 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 ponents are an inexpensive 3.579545MHz TV ‘‘colorburst’’ crystal (for frequency reference) and a bias resistor.
CD22204 Key Features
- No Front End Band Splitting Filters Required
- Single Low Tolerance 5V Supply
- Three-State Outputs for Microprocessor Based Systems
- Detects all 16 Standard DTMF Digits
- Uses Inexpensive 3.579545MHz Crystal
- Excellent Speech Immunity
- Output in 4-Bit Hexadecimal Code
- Excellent Latch-Up Immunity