Description
The MT9094 DPhone-II is a fully featured integrated digital telephone circuit. 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 5 V 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 Zarlinks 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:
    • Speakerphone switching algorithm
    • DTMF and single tone generator
    • Tone Ringer
• Differential interface to telephony transducers
• Differential audio paths
• Single 5 volt power supply

APPLICATIONs
• Fully featured digital telephone sets
• Cellular phone sets
• Local area communications stations