ADV7194 datasheet(51/69 Pages) AD

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ADV7194

–51–

REV. 0

APPENDIX 6

OPTIONAL OUTPUT FILTER

If an output ﬁlter is required for the CVBS, Y, UV, Chroma and

RGB outputs of the ADV7194, the following ﬁlter in Figure 100

can be used in 2

× Oversampling Mode. In 4× Oversampling

Mode the ﬁlter in Figure 102 is recommended. The plot of the

ﬁlter characteristics are shown in Figures 101 and 103. An output

27.0

40.5

54.0

13.5

6.75

FREQUENCY – MHz

FILTER

REQUIREMENTS

FILTER

REQUIREMENTS

–30

Figure 104. Output Filter Requirements in 4

× Oversampling Mode

ﬁlter is not required if the outputs of the ADV7194 are con-

nected to most analog monitors or TVs, however, if the output

signals are applied to a system where sampling is used (e.g.,

Digital TVs) then a ﬁlter is required to prevent aliasing.

0.82 H

470pF

2.5 H

FILTER I/P

FILTER O/P

Figure 100. Output Filter for 2

× Oversampling Mode

FREQUENCY – Hz

–150

100kHz

1.0GHz

1.0MHz

10MHz

100MHz

–50

–100

Figure 101. Output Filter Plot for 2

× Oversampling Filter

470pF

2.2 H

FILTER I/P

FILTER O/P

(TO BUFFER)

Figure 102. Output Filter for 4

× Oversampling Mode

FREQUENCY – Hz

–100

100kHz

1.0GHz

1.0MHz

10MHz

100MHz

–60

–80

–20

–40

Figure 103. Output Filter Plot for 4

× Oversampling Filter

ADV7194 Datasheet(PDF) 51 Page - Analog Devices

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