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TP3040AJ Datasheet

  • TP3040AJ

  • TP3040, TP3040A PCM Monolithic Filter

  • 10頁(yè)

  • NSC

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TP3040 TP3040A PCM Monolithic Filter
September 1994
TP3040 TP3040A PCM Monolithic Filter
General Description
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
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
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
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Designed for D3 D4 and CCITT applications
a
5V
b
5V power supplies
Low power consumption
45 mW (0 dBm0 into 600X)
30 mW (power amps disabled)
Power down mode 0 5 mW
20 dB gain adjust range
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
Block Diagram
TL H 6660 鈥?1
FIGURE 1
C
1995 National Semiconductor Corporation
TL H 6660
RRD-B30M115 Printed in U S A

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