output noise of AD8421ARZ

Question

as shown as the picture above, I connect the vin+ with vin- and power is &plusmn;5V, gain is 80. But the noise is about 10mV from oscilloscope.How can I reduce the noise? 
 Thanks!

ADIApproved · Accepted Answer

Hi DPFATE_DP, 
 Since there is also a 10mV noise on your power supply pin, the noise may come from your power ICs. You may check your power management for noise sources. AD8421 needs a stable DC voltage as the noise can adversely affect performance. 
 You may place a 0.1uf decoupling capacitor as close as possible to each supply pin. 
 I hope this helps. 
 Best regards, Franz)

ADIApproved · Answer

Hi DPFATE_DP, 
 You may want to consider ADR435 which has a very low-noise output. However, please consider that ADR435 is a voltage reference IC with only 30mA of output current. This might not be sufficient if you will use this for your other ICs. 
 Kindly visit our power management forum to inquire about a proper power management IC for your system. 
 I hope this helps. 
 Best regards, Franz

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output noise of AD8421ARZ

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