HT9172 Overview
The HT9172 is a Dual Tone Multi Frequency (DTMF) receiver device which includes an integrated digital decoder and band split filter functions as well as power-down and inhibit mode operations. The device uses digital counting techniques to detect and decode the full range of 16 DTMF tone pairs into a 4-bit code output. Highly accurate switched capacitor filters are utilised to divide the DTMF dual tone frequencies...
HT9172 Key Features
- Operating voltage: 2.5V~5.5V
- Minimal external ponent requirements
- No external filter required
- Low standby current in power down mode)
- Excellent performance
- Tristate data output for MCU interface
- 3.58MHz crystal or ceramic resonator oscillator
- 1633Hz can be inhibited by the INH pin
- 18-pin DIP/SOP packaging
- F ilte r