Low Cost 6-Channel HD/SD Video Filter

ADA4420-6

Rev. 0

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FEATURES

FEATURES

Sixth-order filters

Sixth-order filters

Transparent input sync tip clamp

Transparent input sync tip clamp

−1 dB bandwidth of 26 MHz typical for HD

−1 dB bandwidth of 26 MHz typical for HD

HD rejection @ 75 MHz: 48 dB typical

HD rejection @ 75 MHz: 48 dB typical

NTSC differential gain: 0.19%

NTSC differential gain: 0.19%

NTSC differential phase: 0.76°

NTSC differential phase: 0.76°

Rail-to-rail outputs

Rail-to-rail outputs

Low quiescent current: 32 mA typical

Low quiescent current: 32 mA typical

Disable feature

Disable feature

Output dc offset

Output dc offset

APPLICATIONS

APPLICATIONS

Set-top boxes

Set-top boxes

DVD players and recorders

DVD players and recorders

HDTVs

HDTVs

Projectors

Projectors

Personal video recorders

Personal video recorders

GENERAL DESCRIPTION

GENERAL DESCRIPTION

The ADA4420-6 is a low cost video reconstruction filter specifically

designed for consumer applications. It consists of six independent

sixth-order Butterworth filters/buffers, three for standard

definition (Y/C or CVBS) and three for high definition

component signals (YPbPr or RGB).

The ADA4420-6 is a low cost video reconstruction filter specifically

designed for consumer applications. It consists of six independent

sixth-order Butterworth filters/buffers, three for standard

definition (Y/C or CVBS) and three for high definition

component signals (YPbPr or RGB).

The ADA4420-6 operates from a single 5 V supply and has a

low quiescent current of 32 mA, making it ideal for applications

where power consumption is critical. A disable feature allows

for further power conservation by reducing the supply current

to less than 8 μA typical when the device is not in use.

The ADA4420-6 operates from a single 5 V supply and has a

low quiescent current of 32 mA, making it ideal for applications

where power consumption is critical. A disable feature allows

for further power conservation by reducing the supply current

to less than 8 μA typical when the device is not in use.

FUNCTIONAL BLOCK DIAGRAM

FUNCTIONAL BLOCK DIAGRAM

SD

SD

SD

OUTHD1

OUTHD2

OUTHD3

×2

HD

HD

HD

OUTSD1

OUTSD2

OUTSD3

INHD1

INHD2

INHD3

INSD1

INSD2

INSD3

DIS

CLAMP

×2

×2

×2

×2

×2

×1

×1

×1

×1

×1

×1

CLAMP

CLAMP

CLAMP

CLAMP

CLAMP

ADA4420-6

Figure 1.

Each channel features a transparent sync tip clamp, allowing ac

coupling of the inputs without requiring dc restoration.

The output drivers on the ADA4420-6 have rail-to-rail output

capabilities with 6 dB gain. A built-in offset of 250 mV allows

the outputs to be dc-coupled, eliminating the need for large

coupling capacitors. Each output is capable of driving two 75 Ω

doubly terminated cables.

The ADA4420-6 is available in a 16-lead QSOP and operates in

the extended industrial temperature range of −40°C to +85°C.