Datasheet Summary
munication ICs
DTMF receiver for telephones
The BU8871F is a DTMF receiver ICs developed for use in telephone answering machines, and converts 16 different types of DTMF signals into 4-bit binary serial data. It Features a wide dynamic range, eliminating the need for an external input amplifier. Expertise from a number of panies has been incorporated into these products to enable guard time control through a host microputer. FApplications Telephone answering machines FFeatures
1) Dynamic range of 45dB. (internal AGC) 2) 4-bit binary serial data output. 3) Guard time can be controlled through host microcontroller. FBlock diagram
4) Input pins equipped with hysteresis....