TP3076 COMBO? II Programmable PCM CODEC/Filter for ISDN
and Digital Phone Applications
General Description
The TP3076 is a second-generation combined PCM CODEC
and Filter devices optimized for digital switching applications
on subscriber line and trunk cards and digital phone applications.
Using advanced switched capacitor techniques,
COMBO II combines transmit bandpass and receive lowpass
channel filters with a companding PCM encoder and
decoder. The devices are A-law and μ-law selectable and
employ a conventional serial PCM interface capable of being
clocked up to 4.096 MHz. A number of programmable functions
may be controlled via a serial control port.
Channel gains are programmable over a 25.4 dB range in
each direction.
To enable COMBO II to interface to the SLIC control leads, a
number of programmable latches are included; each may be
configured as either an input or an output. The TP3076
provides 4 latches.