BU8710AKS

Features:

1) Can be connected to -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 separately for individual channels. (Separate encoder and decoder control are possible.) In addition, external pin control enables power consumption to be reduced for the chip as a whole.
4) An internal muting function can be controlled separately 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 individual channels. (Applicable only to decoders.)
7) The G.711 (-law or A-law) output level can be attenuated 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.


Application

PHS base stations


Pinout




Specifications

Parameter	Symbol	Limits	Unit
Power supply voltage	VDD	7.0	V
Input voltage	VIN	VSS-0.3~VDD+0.3	V
Output voltage	VOUT	VSS-0.3~VDD+0.3	V
Operating temperature	Topr	-25~+75
Storage temperature	Tstg	-55~+125

Description

BU8710AKS 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, BU8710AKS is 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.