HT9170B Overview
The HT9170B/D are Dual Tone Multi Frequency (DTMF) receivers integrated with digital decoder and bandsplit filter functions as well as power-down mode and inhibit mode operations. Such devices use digital counting techniques to detect and decode all the 16 DTMF tone pairs into a 4-bit code output. Highly accurate switched capacitor filters are implemented to divide tone signals into low and high group signals.
HT9170B Key Features
- Operating voltage: 2.5V~5.5V
- Minimal external ponents
- No external filter is required
- Low standby current (on power down mode)
- Excellent performance
- Tristate data output for MCU interface
- 3.58MHz crystal or ceramic resonator
- 1633Hz can be inhibited by the INH pin
- HT9170B: 18-pin DIP package
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