TP3069 鈥樷€楨nhanced鈥欌€?Serial Interface CMOS CODEC Filter COMBO
September 1994
TP3069
鈥樷€楨nhanced鈥欌€?Serial Interface
CMOS CODEC Filter COMBO
General Description
The TP3069 (A-law) is a monolithic PCM CODEC Filter uti-
lizing the A D and D A conversion architecture shown in
Figure 1
and a serial PCM interface The device is fabricat-
ed using National鈥檚 advanced double-poly CMOS process
(microCMOS)
Similar to the TP305X family this device features 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
Note
See also AN-370 鈥樷€楾echniques for Designing with CODEC Filter
COMBO Circuits 鈥欌€?/div>
Features
Y
Y
Y
Y
Y
Y
Y
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
A-law compatible COder and DECoder
Internal precision voltage reference
Serial I O interface
Internal auto-zero circuitry
Receive push-pull power amplifiers
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
COMBO and TRI-STATE are registered trademarks of National Semiconductor Corp
Block Diagram
TL H 10578 鈥?1
FIGURE 1
C
1995 National Semiconductor Corporation
TL H 10578
RRD-B30M115 Printed in U S A
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