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The BU8874 and BU8874F are DTMF receiver ICs developed for use in telephone answering machines, and convert 16 different types of DTMF signals into 4-bit binary serial data. In addition to a compact 8-pin DIP (BU8874) package, these receivers feature a wide dynamic range, eliminating the need for an external input amplifier. Expertise from a number of companies has been incorporated into these products to enable guard time control through a host microcontroller.
BU8874 Features
· Dynamic range of 45dB. (internal AGC) · Power down mode. · 4-bit binary serial data output. · Guard time can be controlled through host microcontroller. · Input pins equipped with hysteresis. (ACK pin) · 4.19MHz crystal resonator can be used. ·8-pin DIP package. (BU8874)
BU8874 Typical Application
·Telephone answering machines
BU8874 Connection Diagram
BU8874F General Description
The BU8874 and BU8874F are DTMF receiver ICs developed for use in telephone answering machines, and convert 16 different types of DTMF signals into 4-bit binary serial data. In addition to a compact 8-pin DIP (BU8874) package, these receivers feature a wide dynamic range, eliminating the need for an external input amplifier. Expertise from a number of companies has been incorporated into these products to enable guard time control through a host microcontroller.
BU8874F Features
· Dynamic range of 45dB. (internal AGC) · Power down mode. · 4-bit binary serial data output. · Guard time can be controlled through host microcontroller. · Input pins equipped with hysteresis. (ACK pin) · 4.19MHz crystal resonator can be used. ·8-pin DIP package. (BU8874)