TP3064 TP3067 ‘‘Enhanced’’ Serial Interface CMOS CODEC Filter COMBO
October 1991
TP3064 TP3067
‘‘Enhanced’’ Serial Interface
CMOS CODEC Filter COMBO
General Description
The TP3064 (m-law) and TP3067 (A-law) are 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 advanced dou-
ble-poly CMOS process (microCMOS)
Similar to the TP305X family these devices feature an addi-
tional Receive Power Amplifier to provide push-pull bal-
anced output drive capability The receive gain can be ad-
justed by means of two external resistors for an output level
of up to
g
6 6V across a balanced 600X load
Also included is an Analog Loopback switch and a TS
X
out-
put
See also AN-370 ‘‘Techniques for Designing with CODEC
Filter COMBO Circuits ’’
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
COMBO
tion
and TRI-STATE
are registered trademarks of National Semiconductor Corpora-
Y
Complete CODEC and filtering system 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
Receive push-pull power amplifiers
m-law
TP3064
A-law TP3067
Designed for D3 D4 and CCITT applications
g
5V operation
Low operating power typically 70 mW
Power-down standby mode typically 3 mW
Automatic power-down
TTL or CMOS compatible digital interfaces
Maximizes line interface card circuit density
Block Diagram
TL H 5070 – 1
FIGURE 1
C
1995 National Semiconductor Corporation
TL H 5070
RRD-B30M115 Printed in U S A