MSM6981-01

• Provides 9600 bps modem signal (conformed with ITU-T V.29) transmission capability
• High quality transmission characteristics equal to or better than ITU-T G.721 (ADPCM specification) for voice signals and tone signals
• Provides 24 kbps ADPCM transmission capability for voice signals
• Can be interfaced with m-law or A-law PCM CODECs
• Can operate as ADPCM encoder or decoder (selection of operation mode)
• Asynchronous data input and output
• Serial or parallel data interface
• Usable clock rate of 32 kbps to 2048 kbps for serial input or output
• Selectable 3 bit or 4 bit data conversion
• Low power consumption: +5 V, 70 mW (Typ.)
• Package:
   42-pin plastic DIP (DIP42-P-600-2.54) (Product name : MSM6981-01RS)

The MSM6981-01 is for performing high-efficiency compression to code an A/D converted audio-band PCM signal into an ADPCM signal with a transmission rate of 32 kbps, or conversely for converting an ADPCM signal to a PCM signal.

With digital-digital conversion in particular, if this MSM6981-01 is used as a PCM-ADPCM mutual converter (transcoder) between existing PCMs and CODECs, efficiency can be doubled with respect to conventional transmission lines without loss of call quality.

This MSM6981-01 may be used in high-speed digital dedicated line multiplexors, digital circuit multiplexors and digital PBX's, or in audio band signal coders/decoders for this kind of equipment.

The MSM6981-01 cannot transfer data to and from the MSM6980-03 (MSM6980 family).