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BU8710AKS Datasheet

  • BU8710AKS

  • 4-channel ADPCM transcoder for digital cordless telephone ba...

  • 32頁

  • ROHM

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Communication ICs
4-channel ADPCM transcoder for
digital cordless telephone base stations
BU8710AKS
This is an ADPCM transcoder which conforms to the G.721 standards listed in the 1988 edition of the CCITT recommen-
dations. Simultaneous processing of four encoder and decoder channels is possible, enabling superb affinity with the
quadruple TDMA which is a standard for PHS (personal handy phone) systems. In turn, this enables voice processing
units for individual base stations in the public telephone network to be configured on single chips.
FApplications
PHS base stations
FFeatures
1) Can be connected to
碌-law
and A-law PCM codec
through a serial interface. (Both long frames and
short frames can be accommodated.)
2) Various functions can be controlled through a CPU
interface.
3) An internal power save mode can be controlled sepa-
rately for individual channels. (Separate encoder and
decoder control are possible.) In addition, external
pin control enables power consumption to be re-
duced for the chip as a whole.
4) An internal muting function can be controlled sepa-
rately for individual channels. (Separate encoder and
decoder control are possible.)
5) An internal function silence detection is provided,
which can be controlled separately for individual
channels. (Applicable only to encoders.)
6) An internal background noise generation function is
provided, which can be controlled separately for in-
dividual channels. (Applicable only to decoders.)
7) The G.711 (碌-law or A-law) output level can be atte-
nuated freely on individual channels.
8) An internal 64kbps data through mode is provided,
which can be controlled separately for individual
channels.
9) Internal 32kbps and 64kbps data loop back modes
are provided, which can be controlled separately
for individual channels.
10) An internal clock generator circuit is provided.
11) SQFP 80 pin package is used.
99

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