BU8874 - DTMF receiver for telephones

Rohm

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Datasheet Details

Part number	BU8874
Manufacturer	ROHM
File Size	180.42 KB
Description	DTMF receiver for telephones
Datasheet	BU8874_Rohm.pdf

BU8874 Product details

Description

203 Communication ICs FInput / output circuits INPUT PWDN BU8874 / BU8874F OSC ACK SD ESt 204 Communication ICs FElectrical characteristics (unless otherwise noted, Ta=25_C, VDD=5.0V) BU8874 / BU8874F 205 Communication ICs FCircuit operation (1) An overview of operation A DTMF signal is supplied to the INPUT pin and applied to a pair of 6th-order bandpass filters, which separate the DTMF signal into its high (COL) and low (ROW) frequencies.The separated tonesre converted into square

Features

1) Dynamic range of 45dB. (internal AGC) 2) Power down mode. 3) 4-bit binary serial data output. 4) Guard time can be controlled through host microcontroller. 5) Input pins equipped with hysteresis. (ACK pin) FBlock diagram 6) 4.19MHz crystal resonator can be used. 7) 8-pin DIP package. (BU8874) 202 Communication ICs FAbsolute maximum ratings (Ta=25_C) BU8874 / BU8874F FRecommended operating conditions (Ta=25_C) FPin.

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Published: Apr 17, 2005 |