CD22203 Overview
The CD22202 and CD22203 plete dual-tone multiple frequency (DTMF) receivers detect 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.
CD22203 Key Features
- Central Office Quality
- No Front End Band Splitting Filters Required
- Single, Low Tolerance, 5V Supply
- Detects Either 12 or 16 Standard DTMF Digits
- Uses Inexpensive 3.579545MHz Crystal for Reference
- Excellent Speech Immunity
- Output in Either 4-Bit Hexadecimal Code or Binary Coded 2-of-8
- Synchronous or Handshake Interface
- Three-State Outputs
- Excellent Latch-Up Immunity