HT9170D - DTMF Receiver
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.
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HT9170D Features
* Operating voltage: 2.5V~5.5V
* Minimal external components
* 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 b
