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TP3076J Datasheet

  • TP3076J

  • COMBO II Programmable PCM CODEC/Filter for ISDN and Digital ...

  • 18頁

  • NSC

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TP3076 COMBO II Programmable PCM CODEC/Filter for ISDN and Digital Phone Applications
April 1994
TP3076
COMBO
廬
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 applica-
tions. Using advanced switched capacitor techniques,
COMBO II combines transmit bandpass and receive low-
pass channel filters with a companding PCM encoder and
decoder. The devices are A-law and 碌-law selectable and
employ a conventional serial PCM interface capable of being
clocked up to 4.096 MHz. A number of programmable func-
tions 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 pro-
vides 4 latches.
Features
n
Complete CODEC and Filter system including:
鈥?Transmit and receive PCM channel filters
鈥?碌-law or A-law companding coder and decoder
鈥?Receive power amplifier drives 300鈩?/div>
鈥?4.096 MHz serial PCM data (max)
n
Programmable functions:
鈥?Transmit gain: 25.4 dB range, 0.1 dB steps
鈥?Receive gain: 25.4 dB range, 0.1 dB steps
鈥?Time-slot assignment; to 64 slots/frame
鈥?4 interface latches
鈥?A or 碌-law
鈥?Analog loopback
鈥?Digital loopback
n
Direct interface to solid-state SLICs
n
Standard serial control interface
n
80 mW operating power (typ)
n
1.5 mW standby power (typ)
n
Designed for CCITT and LSSGR specifications
n
TTL and CMOS compatible digital interfaces
Note:
See also AN-614 COMBO II application guide.
Block Diagram
DS009758-1
FIGURE 1.
TRI-STATE
廬
and COMBO
廬
are registered trademarks of National Semiconductor Corporation.
MICROWIRE/PLUS
鈩?/div>
is a trademark of National Semiconductor Corporation.
漏 1999 National Semiconductor Corporation
DS009758
www.national.com

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