E2U0033-28-81
¡ Semiconductor
MSM6981-01
¡ Semiconductor
32 kbps ADPCM TRANSCODER
This version: Aug. 1998
MSM6981-01
Previous version: Nov. 1996
GENERAL DESCRIPTION
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 device 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 device 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).
FEATURES
• 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)
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