TK9092 - Codec

General Description

The Tekmos TK9092 is a replacement of the Mitel MT9092.  This device is a fully integrated digital telephone circuit that includes a built-in HDLC data formatter. It converts voice-band analog signals to digital PCM and back using a switched-capacitor Filter/Codec. This Filter/Codec employs a differential architecture to deliver low-noise performance across a wide dynamic range while operating from a single 5V supply.

A Digital Signal Processor (DSP) enables hands-free speakerphone functionality. The DSP also generates tones such as DTMF, ringer, and call progress signals, and manages audio gain levels. Internal registers are accessed via a serial microport compatible with Intel MCS-51™ specifications.

Features

• Programmable Codec and Filters:
  Supports µ-Law and A-Law companding. ​
  CCITT (G.711) and sign-magnitude coding options. ​
  Programmable transmit, receive, and side-tone gains. ​

• DSP-Based Functionalities:
  Speakerphone switching algorithm for hands-free operation. ​
  DTMF and single-tone generation. ​
  Tone ringer generation. ​

• Audio and Transducer Interfaces:
  Differential interface to telephony transducers. ​
  Differential audio paths for low noise and wide dynamic range. ​

• Analog/Digital and Digital/Analog conversion of audio signals. ​

• Power Supply:
  Operates on a single 5V power supply. ​

• HDLC Data Formatting:
  25 Level 2 HDLC data formatting for D-Channel operation. ​
  Buffered access with 19-byte FIFOs for transmit and receive.

• Microcontroller Compatibility:
  Serial microport compatible with Intel MCS-51 specifications. ​
  Programmable parameters accessible via microcontroller port.
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• Additional Features:
  Local tone generation for network-quality DTMF and single tones. 
  LCD driver with 12 segment outputs for call progress indicators. ​
  On-chip watchdog timer for program integrity. ​

Applications:

• Digital Telephone Sets:
  Fully featured sets with speakerphone and tone generation capabilities. ​

• Cellular Phone Sets:
  Integration of digital audio processing and HDLC data formatting. ​

• Local Area Communication Stations:
  Suitable for proprietary signaling protocols in PABXs and key systems. ​
  These features and applications make the MT9092 HPhone-II ideal for modern telephony systems requiring high-quality audio processing, hands-free operation, and compatibility with digital communication protocols.