Powering options for multiple optical front-ends

Thread Starter

Pavel_147

Joined Sep 6, 2023
3
Hello,
There are 8 LT1328 optical front ends. Is it important to use one LDO per LT1328 or powering all 8 frontends by a single LDO won't significantly degrade the design ?
 

sghioto

Joined Dec 31, 2017
5,369
At only 2 ma per chip I wouldn't think separate supplies would be needed as long as the LDO is well filtered.
Other option is to isolate each chip through a diode to the 5 volt bus.
1699562662962.png
 

Thread Starter

Pavel_147

Joined Sep 6, 2023
3
Thanks.
Ok for single LDO.
Since the LT1328's internal low pass filter apparently could suppress low frequency noise, perhaps a better solution is to use ferrite beads instead of a diode (or diode + ferrite beads)?
 
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