MT9092

® ISO2-CMOS ST-BUS™ FAMILY MT9092 Digital Telephone with HDLC (HPhone-II) 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 ISSUE 2 May 1995 Ordering Information MT9092AP 44 Pin PLCC -40°C to +85°C 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 Mitel's low power ISO2-CMOS technology. Applications Fully featured digital telephone sets Cellular phone sets Local area communications stations DSTo DSTi F0i C4i VSSD VDD VSSA VSS SPKR VBias VRef Digital Signal Processor AAAA AAAAAAAAAAAAAA AAAAAAAA AA...