BU8872 - DTMF receiver for telephones

Rohm

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Datasheet Details

Part number	BU8872
Manufacturer	ROHM
File Size	169.76 KB
Description	DTMF receiver for telephones
Datasheet	BU8872_Rohm.pdf

BU8872 Product details

Description

BU8872 / BU8872FS FInput / output circuits 195 Communication ICs FCircuit 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 tones are converted into square waves and fed to a digital detector.(See the block diagram.) The digital detector checks the two tones to see if they are within the valid DTMF frequency bands.If they are, it sends a DETEC

Features

1) Dynamic range of 45dB. (internal AGC) 2) 4-bit binary serial data output. 3) Guard time can be controlled through host microcomputer. 4) Input pins equipped with hysteresis. (ACK pin) FBlock diagram 5) 4.19MHz ceramic resonator or crystal resonator can be used. 6) 8-pin DIP package. (BU8872) 16-pin SSOP package. (BU8872FS) 192 Communication ICs FAbsolute maximum ratings (Ta=25_C) BU8872 / BU8872FS FRecommended operating conditions (Ta=25_C) 193 Communication ICs FElectrical characteris.

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Published: Apr 17, 2005 |