HT9170B(1999) 查看數據表（PDF） - Holtek Semiconductor

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HT9170B
(Rev.:1999)

DTMF Receiver

Holtek Semiconductor 

HT9170

DTMF Receiver

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 mC 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 HT9170 series are Dual Tone Multi Fre-

quency (DTMF) receivers integrated with digi-

tal decoder and bandsplit filter functions. The

HT9170B and HT9170D types supply

power-down mode and inhibit mode operations.

All types of the HT9170 series use digital count-

ing 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.

Selection Table

Function Operating

OSC

Tristate Power

Part No. Voltage Frequency Data Output Down

1633Hz

Inhibit

DV

DVB Package

HT9170B 2.5V~5.5V 3.58MHz

Ö

Ö

Ö

Ö ¾ 18 DIP

HT9170D 2.5V~5.5V 3.58MHz

Ö

Ö

Ö

Ö ¾ 18 SOP

1

December 20, 1999

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