Integrated Triple Video Filter with Selectable
Cutoff Frequencies for RGB, HD/SD
ADA4412-3
Rev. 0
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FEATURES
Sixth-order adjustable video filters
36 MHz, 18 MHz, and 9 MHz
Many video standards supported: RGB, YPbPr, YUV, SD, Y/C
Ideal for 720p and 1080i resolutions
−1 dB bandwidth of 31.5 MHz for HD
Low quiescent power
Only 265 mW for 3 channels on 5 V supply
Disable feature cuts supply current to 10 μA
DC output offset adjust: ±0.5 V, input referred
Fixed throughput gain of ×2
Excellent video specifications
Wide supply range: +4.5 V to ±5 V
Rail-to-rail output
Output can swing 4.5 V p-p on single 5 V supply
Small packaging: 20-lead QSOP
APPLICATIONS
Set-top boxes
DVD players and recorders
Personal video recorders
HDTVs
Projectors
FUNCTIONAL BLOCK DIAGRAM
05528-001
CUTOFF SELECT
DC
OFFSET
LEVEL2
LEVEL1
2
Y/G OUT
Pb/B OU
Pr/R OUT
DISABLE
Y/G IN
Pb/B IN
Pr/R IN
36MHz, 18MHz, 9MHz
36MHz, 18MHz, 9MHz
36MHz, 18MHz, 9MHz
×2
×2
×2
×1
×1
×1
ADA4412-3
Figure 1.
GENERAL DESCRIPTION
The ADA4412-3 is a comprehensive filtering solution designed
to give designers the flexibility to easily filter and drive various
video signals, including high definition video. Cutoff frequen-
cies of the sixth-order video filters range from 9 MHz to
36 MHz and can be selected by two logic pins to obtain four
filter combinations that are tuned for RGB, high definition, and
standard definition video signals. The ADA4412-3 has a rail-to-
rail output that can swing 4.5 V p-p on a single 5 V supply.
The ADA4412-3 includes an output offset voltage adjustment
feature. Output voltage offset is continuously adjustable over an
input-referred range of ±500 mV by applying a differential
voltage to an independent offset control input.
The ADA4412-3 can operate on a single +5 V supply as
well as on ±5 V supplies. Single-supply operation is ideal in
applications where power consumption is critical. The disable
feature allows for further power conservation by reducing the
supply current to typically 10 µA when a particular device is not
in use.
Dual-supply operation is best for applications where the
negative-going video signal excursions must swing at or below
ground while maintaining excellent video performance. The
output buffers have the ability to drive two 75 Ω doubly
terminated cables that are either dc-coupled or ac-coupled.
The ADA4412-3 is available in a 20-lead QSOP and is rated for
operation over the extended industrial temperature range of
−40°C to +85°C.
