The MT9094 DPhone-II is a fully featured integrated digital telephone circuit with programmable µ-Law/A-Law codec and filters, programmable CCITT (G.711)/sign-magnitude coding, programmable transmit, receive and side-tone gains, etc. It uses DSP technology to provide handsfree speaker-phone operation and can generate tones (DTMF, Ringer and Call Progress) and control audio gains. The device is fabricated in Zarlink's low power ISO2-CMOS technology.
The MT9094 DPhone‑II is a fully featured integrated digital telephone circuit that converts voice‑band signals to PCM and back using a switched‑capacitor filter/codec. It operates from a single 5 V supply and includes a DSP for hands‑free speaker‑phone operation, DTMF generation, tone ringer, and programmable audio gains.
The datasheet provides a functional block diagram, a complete 44‑pin PLCC pinout, register maps, and detailed specifications such as audio gain ranges, codec companding options, and serial ST‑BUS interface parameters. It also describes the DSP micro‑programs and optional features like offset nulling and high‑pass filtering.
| Supply Voltage | 5 V (single supply) |
|---|---|
| Package | 44‑pin PLCC |
| Audio Gain Range | -72 dB to +22.5 dB (1.5 dB steps) |
| Codec Companding | µ‑Law / A‑Law |
| Serial ST‑BUS Data Rate | 2048 kbit/s |
The device operates from a single 5 V supply.
It is supplied in a 44‑pin PLCC package.
Audio gain can be programmed from –72 dB to +22.5 dB in 1.5 dB steps.
The ST‑BUS interface runs at 2048 kbit/s.