Decodificador Dtmf Ht9170 Smd 18sop Itytarg

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 µC interface

• 3.58MHz crystal or ceramic resonator

• 1633Hz can be inhibited by the INH pin

General Description

The HT9170 series are Dual Tone Multi Frequency

(DTMF) receivers integrated with digital

decoder and bandsplit filter functions. The

HT9170B and HT9170D types supply powerdown

mode and inhibit mode operations. All

types of the HT9170 series 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

employed to divide tone (DTMF) signals into

low and high group signals. A built-in dial tone

rejection circuit is provided to eliminate the

need for pre-filtering

Datasheet