TP3054 TP3057 ‘‘Enhanced’’ Serial Interface CODEC Filter COMBO Family
August 1994
TP3054 TP3057
‘‘Enhanced’’ Serial Interface
CODEC Filter COMBO Family
General Description
The TP3054 TP3057 family consists of
m-law
and A-law
monolithic PCM CODEC filters utilizing the A D and D A
conversion architecture shown in
Figure 1
and a serial PCM
interface The devices are fabricated using National’s ad-
vanced double-poly CMOS process (microCMOS)
The encode portion of each device consists of an input gain
adjust amplifier an active RC pre-filter which eliminates very
high frequency noise prior to entering a switched-capacitor
band-pass filter that rejects signals below 200 Hz and above
3400 Hz Also included are auto-zero circuitry and a com-
panding coder which samples the filtered signal and en-
codes it in the companded
m-law
or A-law PCM format The
decode portion of each device consists of an expanding
decoder which reconstructs the analog signal from the
companded
m-law
or A-law code a low-pass filter which
corrects for the sin x x response of the decoder output and
rejects signals above 3400 Hz followed by a single-ended
power amplifier capable of driving low impedance loads
The devices require two 1 536 MHz 1 544 MHz or 2 048
MHz transmit and receive master clocks which may be
asynchronous transmit and receive bit clocks which may
vary from 64 kHz to 2 048 MHz and transmit and receive
frame sync pulses The timing of the frame sync pulses and
PCM data is compatible with both industry standard formats
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Complete CODEC and filtering system (COMBO)
including
Transmit high-pass and low-pass filtering
Receive low-pass filter with sin x x correction
Active RC noise filters
m-law
or A-law compatible COder and DECoder
Internal precision voltage reference
Serial I O interface
Internal auto-zero circuitry
m-law
16-pin TP3054
A-law 16-pin TP3057
Designed for D3 D4 and CCITT applications
g
5V operation
Low operating power typically 50 mW
Power-down standby mode typically 3 mW
Automatic power-down
TTL or CMOS compatible digital interfaces
Maximizes line interface card circuit density
Dual-In-Line or surface mount packages
See also AN-370 ‘‘Techniques for Designing with
CODEC Filter COMBO Circuits’’
Connection Diagrams
Dual-In-Line Package
Plastic Chip Carriers
TL H 5510 – 1
Top View
Order Number TP3054J or TP3057J
See NS Package Number J16A
Order Number TP3054N or TP3057N
See NS Package Number N16A
Order Number TP3054WM or TP3057WM
See NS Package Number M16B
TL H 5510 – 10
Top View
Order Number TP3057V
See NS Package Number V20A
COMBO and TRI-STATE are registered trademarks of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL H 5510
RRD-B30M125 Printed in U S A
NSC [ NATIONAL SEMICONDUCTOR ]
