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 etect and decode all the 16 DTMF tonepairs into a 4-bit code output.

Features of HT9170B DTMF Receiver

• Operating voltage: 2.5V~5.5V.
• Minimal external componentsy.
• 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.

Applications of HT9170B DTMF Receiver

• DTMF Reception and decoding.
• Developing devices that can be controlled via a dtmf sent by a mobile.
• Mobile phone based device control.
• DIY projects with DTMF control.

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