Integrated Triple Video Filter with Selectable
Cutoff Frequencies for RGB, HD/SD
ADA4412-3
FEATURES FUNCTIONAL BLOCK DIAGRAM
Sixth-order adjustable video filters
36 MHz, 18 MHz, and 9 MHz
Y/G IN 1 2 Y/G OUT
Many video standards supported: RGB, YPbPr, YUV, SD, Y/C
36MHz, 18MHz, 9MHz
Ideal for 720p and 1080i resolutions
1 dB bandwidth of 31.5 MHz for HD
1 2 Pb/B OUT
Pb/B IN
Low quiescent power
36MHz, 18MHz, 9MHz
Only 265 mW for 3 channels on 5 V supply
Disable feature cuts supply current to 10 A
Pr/R IN 1 2 Pr/R OUT
DC output offset adjust: 0.5 V, input referred
36MHz, 18MHz, 9MHz
Fixed throughput gain of 2
DC
OFFSET
Excellent video specifications
LEVEL1
Wide supply range: +4.5 V to 5 V
LEVEL2
ADA4412-3
Rail-to-rail output
2
CUTOFF SELECT
Output can swing 4.5 V p-p on single 5 V supply
DISABLE
Small packaging: 20-lead QSOP
Figure 1.
APPLICATIONS
Set-top boxes
DVD players and recorders
Personal video recorders
HDTVs
Projectors
GENERAL DESCRIPTION
The ADA4412-3 is a comprehensive filtering solution designed The ADA4412-3 can operate on a single +5 V supply as
to give designers the flexibility to easily filter and drive various well as on 5 V supplies. Single-supply operation is ideal in
video signals, including high definition video. Cutoff frequen- applications where power consumption is critical. The disable
cies of the sixth-order video filters range from 9 MHz to feature allows for further power conservation by reducing the
36 MHz and can be selected by two logic pins to obtain four supply current to typically 10 A when a particular device is not
filter combinations that are tuned for RGB, high definition, and in use.
standard definition video signals. The ADA4412-3 has a rail-to-
Dual-supply operation is best for applications where the
rail output that can swing 4.5 V p-p on a single 5 V supply.
negative-going video signal excursions must swing at or below
The ADA4412-3 includes an output offset voltage adjustment ground while maintaining excellent video performance. The
feature. Output voltage offset is continuously adjustable over an output buffers have the ability to drive two 75 doubly
input-referred range of 500 mV by applying a differential terminated cables that are either dc-coupled or ac-coupled.
voltage to an independent offset control input.
The ADA4412-3 is available in a 20-lead QSOP and is rated for
operation over the extended industrial temperature range of
40C to +85C.
Rev. 0
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05528-001ADA4412-3
TABLE OF CONTENTS
Features .............................................................................................. 1 Applications..................................................................................... 10
Applications....................................................................................... 1 Overview ..................................................................................... 10
Functional Block Diagram .............................................................. 1 Disable ......................................................................................... 10
General Description ......................................................................... 1 Cutoff Frequency Selection....................................................... 10
Revision History ............................................................................... 2 Output DC Offset Control........................................................ 10
Specifications..................................................................................... 3 Input and Output Coupling ...................................................... 11
Absolute Maximum Ratings............................................................ 5 Printed Circuit Board Layout ................................................... 11
Thermal Resistance ...................................................................... 5 Video Encoder Reconstruction Filter...................................... 11
ESD Caution.................................................................................. 5 Outline Dimensions ....................................................................... 13
Pin Configuration And Function Descriptions............................ 6 Ordering Guide .......................................................................... 13
Typical Performance Characteristics ............................................. 7
Theory of Operation ........................................................................ 9
REVISION HISTORY
7/05Revision 0: Initial Version
Rev. 0 | Page 2 of 16