Differential signal amplify

Question

Differential signal from Resistance bridge(P3). ADC is ADUC7060 Internal .Consideration 4-20mA Circuit ,the power dissipation very low.Can only use ADA4051-2 Build Differential signal amplify. The scheme is ok? In the debug,ADC1 ADC0 have 50HZ vpp 200mV Noise.Needs to go a step further filter? 
 How to filter out the noise（50Hz）. 
 
 https://ez.analog.com/cfs-file/__key/communityserver-discussions-components-files/386/7824.9bdef502a939740fda8f1af7248a0e4c.html

FormerMember · Accepted Answer

abcdoaabc, 
 You are taking a large amount of gain, so pc board layout is very critical to avoid noise problems. At a minimum, you should make 
 provisions to add a capacitor across each15k resistor. It is good that you have both common mode and differential mode R-C filtering 
 on the inputs. What are the characteristics of the bridge? Impedances, voltage or current drive (how much). What are you measuring? 
 pressure? weight? How fast will the signal change? If ten Hertz, you can apply heavy filtering to reduce the 50 Hz noise. If the signal 
 frequency is higher, then layout and shielding is the only answer. 
 Harry)

EZAdministrator · Answer

This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum. Thank you, EZ Admin

Electronic Design Services - PartnerZone

Products Mentioned

Differential signal amplify