CS4952 查看數據表（PDF） - Cirrus Logic

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CS4952

NTSC/PAL Digital Video Encoder

Cirrus Logic 

CS4952/53

be advisable to use microstrip techniques to further

reduce radiated switching noise if very fast edge

rates (<2ns) are used. If microstrip techniques are

used, split the analog and digital ground planes and

use proper RF decoupling techniques.

Analog Interconnect

The CS4952/3 should be located as close as possible

to the output connectors to minimize noise pickup

and reflections due to impedance mismatch. All un-

used analog outputs should be placed in shutdown.

This reduces the total power that the CS4952/3 re-

quires, and eliminates the impedance mismatch pre-

sented by an unused connector. The analog outputs

should not overlay the analog power plane to maxi-

mize high frequency power supply rejection.

Analog Output Protection

To minimize the possibility of damage to the ana-

log out put sections, make sure that all video con-

nectors are well grounded. The connector ground

should have a good DC ground path to the analog

and digital power supply grounds. If no DC (and

low frequency) path is present, improperly ground-

ed equipment may impose damaging reverse cur-

rents on the video out lines. Therefore, it is also a

good idea to use output filters that are AC coupled

to avoid any problems.

ESD Protection

External DAC Output Filter

If an output filter is required for the composite

and/or S-video outputs of the CS4952/53, the fol-

lowing low pass filter in Figure 15 can be used.

IN

C1

2.2µH

OUT

330pF

C2

220pF

C CABLE

C2 should be chosen so that C1 = C2 + CCABLE

Figure 15. Low Pass Filter

DS223PP2

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