Discrepancy Between LS1043A Datasheet and Design Guide

[abhinav]

Hi,

I have a question pertaining to the LS1043A and LS10xxA family. The datasheet of this device lists +/-30mV as the recommended value for the rail on VDD. The design guide for supply filtering, however, lists the requirements as +50mV/-30mV. This is a significant difference at this tight of a spec so I was posting for clarification on which of these is correct, and whether the datasheet is referring solely to DC variation and does not include transients or not.

Thanks,

Abhinav.

[andrei_skok]

For positive transient response, it must be below Vdd + 50 mV (although it may exceed Vdd + 30 mV)
For negative transient response, it must be within Vdd - 30 mV.

The +50mv -30mv is total deviation due to thermal, di/dt of transients, base regulation and ripple from the regulator.

Have a great day,
Andrei

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