ADA4420-6 Datasheet, PDF (1/12 Pages) Analog Devices – Low Cost 6-Channel HD/SD Video Filter

Low Cost 6-Channel HD/SD Video Filter
ADA4420-6
FEATURES
Sixth-order filters
Transparent input sync tip clamp
−1 dB bandwidth of 26 MHz typical for HD
HD rejection @ 75 MHz: 48 dB typical
NTSC differential gain: 0.19%
NTSC differential phase: 0.76°
Rail-to-rail outputs
Low quiescent current: 32 mA typical
Disable feature
Output dc offset
APPLICATIONS
Set-top boxes
DVD players and recorders
HDTVs
Projectors
Personal video recorders
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 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
INSD1
×1
CLAMP
SD
×2
OUTSD1
INSD2
×1
CLAMP
OUTSD2
SD
×2
INSD3
×1
DIS ^CLAMP
INHD1
×1
CLAMP
OUTSD3
SD
×2
OUTHD1
HD
×2
INHD2
×1
CLAMP
OUTHD2
HD
×2
INHD3
×1
CLAMP
OUTHD3
HD
×2
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.
Rev. 0
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