AD8557
Recommended for New Designs
The AD8557 is a zero drift, sensor signal amplifier with digitally
programmable gain and output offset. Designed to easily and
accurately convert variable...
Datasheet
AD8557 on Analog.com
AD8557 I want to measure current at a 0.1 ohm with one end to a load and Vcc and the other to ground. The voltage in the VNeg is in the order of 3 mV or less but I cannot amplify it.
When I add another resistor in series with the 0.1 Ohm resistor in the low side raising the VNeg input it, works Ok
So what is the minimum voltage I need in (-)input
Thanks
Hi TomasMDZ ,
Good day. For a single supply operation with Vdd=5.0V and Vss=0V, the allowable input voltage range is 0.6V to 3.8V. If the Vneg input is less than 0.6V, It seems that the part is not operating in the linear region.
I think that is also the reason why it works when you raise the Vneg input. Thank you.
Regards,
Gilbeys
Hi TomasMDZ ,
Good day. For a single supply operation with Vdd=5.0V and Vss=0V, the allowable input voltage range is 0.6V to 3.8V. If the Vneg input is less than 0.6V, It seems that the part is not operating in the linear region.
I think that is also the reason why it works when you raise the Vneg input. Thank you.
Regards,
Gilbeys
