General Description:

The AX9170B/Dare 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 countingtechniques to detect and decode all the 16 DTMF tone pairs into a 4-bit code output.Highly accurate switched capacitor filters are imple- mented to divide tone signals into low and high group signals. A built-indialtone rejection circuit is provided to

eliminate the need for pre-filtering.

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

· AX9170B: 18-pin DIP package

· AX9170D: 18-pin SOP package