tp3070 National Semiconductor Corporation, tp3070 Datasheet

tp3070

Manufacturer Part Number

tp3070

Description

Combo Ii Programmable Pcm Codec/filter

Manufacturer

National Semiconductor Corporation

Datasheet

1.TP3070.pdf (26 pages)

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Current page: 1 of 26
Download datasheet (402Kb)

TP3070, TP3071, TP3070-X

COMBO

General Description

The TP3070 and TP3071 are second-generation combined

PCM CODEC and Filter devices optimized for digital switch-

ing applications on subscriber line and trunk cards. Using

advanced switched capacitor techniques, COMBO II com-

bines 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, and a programmable filter is included to en-

able Hybrid Balancing to be adjusted to suit a wide range of

loop impedance conditions. Both transformer and active

SLIC interface circuits with real or complex termination im-

pedances can be balanced by this filter, with cancellation in

excess of 30 dB being readily achievable when measured

across the passband against standard test termination net-

works.

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 TP3070 pro-

vides 6 latches and the TP3071 5 latches.

COMBO

and TRI-STATE

are registered trademarks of National Semiconductor Corporation.

II Programmable PCM CODEC/Filter

DS008635

Features

n Complete CODEC and FILTER system including:

n Programmable Functions:

n Direct interface to solid-state SLICs

n Simplifies transformer SLIC; single winding secondary

n Standard serial control interface

n 80 mW operating power (typ)

n 1.5 mW standby power (typ)

n Designed for CCITT and LSSGR applications

n TTL and CMOS compatible digital interfaces

n Extended temperature versions available for −40˚C to

+85˚C (TP3070V-X)

— Transmit and receive PCM channel filters

— µ-law or A-law companding encoder and decoder

— Receive power amplifier drives 300

— 4.096 MHz serial PCM data (max)

— Transmit gain: 25.4 dB range, 0.1 dB steps

— Receive gain: 25.4 dB range, 0.1 dB steps

— Hybrid balance cancellation filter

— Time-slot assignment; up to 64 slots/frame

— 2 port assignment (TP3070)

— 6 interface latches (TP3070)

— A or µ-law

— Analog loopback

— Digital loopback

Note: See also AN-614, COMBO II application guide.

www.national.com

April 1994

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