MT8870D/MT8870D-1 is a complete DTMF receiver with features including complete DTMF receiver functionality, low power consumption, internal gain setting amplifier, adjustable guard time, central office quality, power-down mode, inhibit mode, backward compatibility with MT8870C/MT8870C-1. It is suitable for receiver systems for British Telecom (BT) or CEPT Spec (MT8870D-1), as well as applications such as paging systems, repeater systems/mobile radio, credit card systems, remote control, personal computers, telephone answering machines.