AD7341_15 Datasheet, PDF (1/16 Pages) Analog Devices – LC MOS VOICEVAND RECONSTRUCTION AND ANTIALIASING FILTER SET

ANALOGDEVICES fAX-ON-DEMAND HOTLINE _{- Page 28}
ANALOG
LIllIDEVICES
LC2MOS
VoicebandReconstruction
andAntialiasingFilterSet
I
FEATURES
- AD7341 Transmit (Reconstruction)
Filter for 14-Bit
AD7341/AD7371I
FUNCTIONAL BLOCK DIAGRAMS
DAC (AD7840)
- ^{Programmable Attenuation (OdB to -38dB)}
AD7371 Receive Filter for 14-Bit ADC (AD7871)
OPO OP1
v"
v~.
rXIN
Programmable Gain (OdS to 24dB)
AD7341
7OdB Stopband Attenuation
- ^{75dB In-Band Signal-to-Noise Ratio}
Better Than 75dB Total Harmonic Distortion
OBSOLETE CCITTV.32 and V.33 Compatible
Small. 0.3". 24-Pin Plastic Package and 28-Pin PLCe
GENERAL DESCRIPTION
The AD7341 and AD7371 are reconstruction and antialiasing
fLltersdesigned for use in high speed voiceband modems with
speeds up to 14.4 kbitslsec) in accordance with CCITT V.32
and V.33 recommendations. These Hlters, along with the
AD7840 DAC) the AD7871 ADC and a digital signal processor
(DSP) can be used to implement a complete modern.
The AD7341 is the transmit or reconstruction ftlter. It imple-
ments the filter function using a seventh order low pass
switched capacitor filter and a second order low pass continuous
S'lNCOiJT { J
01'0 OP1
Vco Va.
RXIN
time filter. The cutoff frequency is 305kHz.
The AD7371 is the receive fIlter. It is a high order bandpass
fLlterwith a lower cUtoff frequency of 180Hz and an upper
cutoff frequency of 3.5kHz. The ftlter function is implemented
using a second order low pass continuous time fIlter, a fourth
order high pass switched capacitor fIlter and a seventh order low
pass switched capacitor fIlter.
SVNCOUT (3
AD7371
oso OS; OS2
REV. A
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use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implicationor
otherwise under any patent or patent rights of Analog Devices.
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