Integrated Triple Video Filter with Selectable

Cutoff Frequencies for RGB, HD/SD

ADA4412-3

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

© 2005 Analog Devices, Inc. All rights reserved.

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

CUTOFF SELECT

DC

OFFSET

LEVEL2

LEVEL1

2

Y/G OUT

Pb/B OUT

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.