CS4953 datasheet(37/44 Pages) CIRRUS

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CS4952/53

DS223PP2

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.

2.2

µH

330pF

220pF

OUT

C 1

CCABLE

should be chosen so that

= C2 +

Figure 15. Low Pass Filter

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