IN9270 Datasheet (Integral)

IN9270, DTMF RECEIVER

NAME ESt PIN 16 DESCRIPTION Early steering output.

Presents a logic high immediately when the digital algorithm detects a recognizable tone-pair (signal condition).

Any momentary loss of signal condition will cause ESt to return to a logic low.

Gain Select.

Gives access to output of front-end diff

TECHNICAL DATA IN9270 DTMF RECEIVER High-Performance Silicon-Gate CMOS The IN9270 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 dialtone 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 amplifi

IN9270 Features

* Test Conditions VOUT