This document introduces the features and characteristics of MT9094 DPhone-II, including programmable µ-Law/A-Law codec and filters, programmable CCITT (G.711)/sign-magnitude coding, programmable transmit, receive and side-tone gains, DSP, differential interface, differential audio paths and single 5 volt power supply.
The MT9094 DPhone‑II is a fully integrated digital telephone chip built in ISO‑2 CMOS technology. It provides a programmable codec, DSP‑based audio processing, and a differential interface to convert between analog transducers and digital PCM streams.
The document describes the functional block diagram, pin descriptions, register map, gain control, DTMF and tone‑ringer generation, and optional features such as auto‑nulling and high‑pass filtering. All programmable parameters are accessed via an Intel MCS‑51 compatible serial microport.
| Supply voltage | 5 V |
|---|---|
| Package | 44‑pin PLCC |
| Operating temperature range | 740°C to +85°C |
| Clock input | 4096 kHz |
| Gain control range | +22.5 dB to –72 dB |
Pin 1 (M+) is the non‑inverting microphone input.
Pin 7 (DSTi) is the ST‑BUS serial input (2048 kbit/s) and pin 8 (DSTo) is the serial output.
Set the PuFC bit in the Transducer Control Register high to enable the Filter/Codec.