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Forum Post: RE: ADS5407 Vcm output drive strength

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Hi,

The VCM output has 2 K ohm series resistance, (due to ESD protection reasons) so the drive strength of this pin is less than normal.  Much less.  For example, if you wanted to hold to within 100 mV of the desired 1.9V output then this would imply a current limit of 50 uA.  This might be enough for one CM input on some amps that i have seen, but might be a problem for multiple loads on the pin.  You might have to buffer the votlage through an amp to get more drive strength.

Regards,

Richard P.


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