HM9270C Ver la hoja de datos (PDF) - ELAN Microelectronics

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componentes Descripción

Fabricante

HM9270C

DTMF RECEIVER

ELAN Microelectronics 

HM 9270C/D

DTMF RECEIVER

General Description

The HM 9270C/D is a complete DTMF receiver integrating both the bandsplit filter and digital decoder

functions. The filter section uses switched capacitor techniques for high- and low-group filters and dial-tone

rejection. Digital counting techniques are employed in the decoder to detect and decode all 16 DTMF tone-

pairs into a 4-bit code. External component count is minimized by on-chip provision of a differential input

amplifier, clock-oscillator and latched 3-state bus interface.

Features

• Complete receiver in an 18-pin package.

• Excellent performance.

• CMOS, single 5 volt operation.

• Minimum board area.

• Central office quality.

• Low power consumption.

• Power-Down mode (HM9270D only).

• Inhibit-mode (HM9270D only).

Pin Configurations

HM9270C

IN+ 1

IN 2

GS 3

VREF

4

IC* 5

IC* 6

OSC1 7

OSC2 8

VSS

9

18 VDD

17 St/GT

16 ESt

15 StD

14 Q4

13 Q3

12 Q2

11 Q1

10 TOE

HM9270D

IN+ 1

IN 2

GS 3

VREF

4

INH 5

PWDN 6

OSC1 7

OSC2 8

VSS

9

18 VDD

17 St/GT

16 ESt

15 StD

14 Q4

13 Q3

12 Q2

11 Q1

10 TOE

* Connect to V

SS

-1-

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