Description

Product details

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.

Keywords

• INH pin
• Such devices
• 16 DTMF tone
• tone signals
• MCU interface
• mode operations
• power-down mode
• 3.58MHz crystal
• digital decoder
• external filter
• filter functions
• ceramic resonator
• Operating voltage
• 4-bit code output
• high group signals
• 18-pin SOP package
• 18-pin DIP package
• General Description
• Low standby current
• Tristate data output
• Excellent performance
• Dual Tone Multi Frequency
• digital counting techniques
• Minimal external components
• dial tone rejection circuit
• accurate switched capacitor filters