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TP3040AN Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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TP3040AN Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 10 page TLH6660 September 1994 TP3040 TP3040A PCM Monolithic Filter General Description The TP3040TP3040A 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 34 kHz RECEIVE FILTER STAGE The receive filter is a fifth order elliptic low pass filter de- signed to reconstruct the voice signal from the decodedde- multiplexed signal which as a result of the sampling pro- cess is a stair-step signal having the inherent sin xx 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 Designed for D3D4 and CCITT applications Y a 5V b5V power supplies Y Low power consumption 45 mW (0 dBm0 into 600X) 30 mW (power amps disabled) Y Power down mode 05 mW Y 20 dB gain adjust range Y No external anti-aliasing components Y Sin xx correction in receive filter Y 5060 Hz rejection in transmit filter Y TTL and CMOS compatible logic Y All inputs protected against static discharge due to handling Block Diagram TLH6660 – 1 FIGURE 1 C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A |
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