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Description

The MT9092 HPhone-II is a fully featured integrated digital telephone circuit which includes an HDLC data formatter. Voice band signals are converted to digital PCM and vice versa by a switched capacitor Filter/Codec. The Filter/Codec uses an ingenious differential architecture to achieve low noise operation over a wide dynamic range with a single 5V supply. A Digital Signal Processor provides handsfree speaker-phone operation. The DSP is also used to generate tones (DTMF, Ringer and Call Progress) and control audio gains. Internal registers are accessed through a serial microport conforming to INTEL MCS-51? specifications. The device is fabricated in Mitels low power ISO2-CMOS technology.

Features

? Programmable μ-Law/A-Law codec and filters

? Programmable CCITT (G.711)/sign-magnitude coding

? Programmable transmit, receive and side-tone gains

? DSP-based:

i) Speakerphone switching algorithm

ii) DTMF and single tone generator

iii) Tone Ringer

? Differential interface to telephony transducers

? Differential audio paths

? Single 5 volt power supply

? X.25 Level 2 HDLC data formatting

Applications

? Fully featured digital telephone sets

? Cellular phone sets

? Local area communications stations