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TP3040AJFN/a300avaiTP3040/ TP3040A PCM Monolithic Filter
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TP3040J ,TP3040/ TP3040A PCM Monolithic FilterTP3040,TP3040APCMMonolithicFilterSeptember1994TP3040,TP3040APCMMonolithicFilterGeneralDescription
TP3040V ,TP3040/ TP3040A PCM Monolithic FilterTP3040,TP3040APCMMonolithicFilterSeptember1994TP3040,TP3040APCMMonolithicFilterGeneralDescription
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TP3040AJ-TP3040AN-TP3040J-TP3040V
TP3040/ TP3040A PCM Monolithic Filter
TL/H/6660
TP3040,
TP3040A
PCM
Monolithic
Filter
September 1994
TP3040, TP3040A PCM Monolithic Filter
General Description
The TP3040/TP3040A filterisa monolithic circuit contain-
ing both transmit andreceive filters specifically designedfor
PCM CODEC filtering applicationsin8 kHz sampled sys-
tems.
The filteris manufactured using microCMOS technology
and switched capacitor integratorsare usedto simulate
classicalLC ladder filters which exhibitlow component sen-
sitivity.
TRANSMIT FILTERSTAGE
The transmit filterisa fifth order ellipticlow pass filterin
serieswitha fourth order Chebyshev high pass filter.Itpro-
videsaflat responseinthe passbandand rejectionofsig-
nals below200Hzand above3.4 kHz.
RECEIVEFILTER STAGE
The receive filterisafifth order ellipticlow pass filterde-
signedtoreconstructthe voice signal fromthe decoded/de-
multiplexed signal which,asa resultofthe sampling pro-
cess,isa stair-step signal havingthe inherentsinx/xfre-
quency response.The receive filter approximatesthe func-
tion requiredto compensateforthe degraded frequencyre-
sponseand restoretheflat passband response.
Features Designedfor D3/D4and CCITT applications a5V, b5V power supplies Low power consumption: mW(0 dBm0into 600X) mW (power amps disabled) Power down mode:0.5 mW20dB gain adjust rangeNo external anti-aliasing componentsSinx/x correctionin receive filter 50/60Hz rejectionin transmit filter TTLand CMOS compatible logicAll inputs protected against static dischargedueto
handling
Block Diagram
TL/H/6660–1
FIGURE1
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
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