TP3040N

更新时间： 2024-02-02 02:19:11

品牌	Logo	应用领域
美国国家半导体 - NSC		电信集成电路光电二极管 PC
页数	文件大小	规格书
10页	185K
描述
TP3040, TP3040A PCM Monolithic Filter

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TP3040N 数据手册

September 1994

TP3040, TP3040A PCM Monolithic Filter

General Description

Features

Designed for D3/D4 and CCITT applications

The TP3040/TP3040A filter is a monolithic circuit contain-

ing both transmit and receive filters specifically designed for

PCM CODEC filtering applications in 8 kHz sampled sys-

tems.

Low power consumption:

5V, 5V power supplies

45 mW (0 dBm0 into 600X)

30 mW (power amps disabled)

Power down mode: 0.5 mW

20 dB gain adjust range

The filter is manufactured using microCMOS technology

and switched capacitor integrators are used to simulate

classical LC ladder filters which exhibit low component sen-

sitivity.

No external anti-aliasing components

Sin x/x correction in receive filter

50/60 Hz rejection in transmit filter

TTL and CMOS compatible logic

All inputs protected against static discharge due to

handling

TRANSMIT FILTER STAGE

The transmit filter is a fifth order elliptic low pass filter in

series with a fourth order Chebyshev high pass filter. It pro-

vides a flat response in the passband and rejection of sig-

nals below 200 Hz and above 3.4 kHz.

RECEIVE FILTER STAGE

The receive filter is a fifth order elliptic low pass filter de-

signed to reconstruct the voice signal from the decoded/de-

multiplexed signal which, as a result of the sampling pro-

cess, is a stair-step signal having the inherent sin x/x fre-

quency response. The receive filter approximates the func-

tion required to compensate for the degraded frequency re-

sponse and restore the flat passband response.

Block Diagram

TL/H/6660–1

FIGURE 1

1995 National Semiconductor Corporation

TL/H/6660

RRD-B30M115/Printed in U. S. A.

12 3 4 5 6 7...10

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