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High side current measurement

Ramakrishna Challa
Prodigy 160 points

Dear all,

I have 0.005 Ohm current sense resistor.  What's the best differential amplifier to measure the current (max 500mA). 

Specifications

1) High side current measurement

2) The bus voltage is 125V while the Op-amp would be supplied 5V.

3) need to measurement the current in both the directions

OPA350 is suitable for this application?

V=IR Drop across current resistor = 0.005*5m = 25uV, this is very small voltage

Any referense schematics would be of great help.

thanks and regards

Ramakrishna