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.
The document describes the ISO-CMOS MT8870D/MT8870D-1, a complete Dual-Tone Multi-Frequency (DTMF) receiver. It integrates both bandsplit filters and digital decoder functions to detect and decode all 16 DTMF tone pairs into a 4-bit code. The device is designed for low power consumption and offers various package options including Plastic DIP, Ceramic DIP, SOIC, SSOP, and TSSOP.
The device operates within a temperature range of -40 °C to +85 °C.
The Vop pin requires a typical input of +5V.
A 3.579545 MHz crystal must be connected to complete the internal oscillator circuit.