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 by the INH pin
· HT9170B: 18-pin DIP package
HT9170D: 18-pin SOP package
General Description
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. A built-in dial tone rejection circuit is provided to
eliminate the need for pre-filtering.
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