plswelcomeroh Posted January 8 Share Posted January 8 Hi team, Can you please check it? Recently I placed the order and checked V+ output noise of AD3. However, it is 120mV output offset during V- makes 19mV even though I calibrated newly. Is it the in range spec? I believe it is NOT normal. Too much high 120mV V+ for lab equipment. Thanks in advance, can you please update me? Link to comment Share on other sites More sharing options...
0 plswelcomeroh Posted January 9 Author Share Posted January 9 Hi team again, As I updated about Idle offset of V+, when I measured in close loop, i.e., connected V+ to scope ch1 directly, and connected V- to scope ch2 directly. V+ is 192mV, during V- is only 4mV. Any support for it? I bought it from Mouser Korea, Do I need to contact them? Could you please let me know how do I do / change AD3 if it is bad? Thanks. Link to comment Share on other sites More sharing options...
0 attila Posted January 9 Share Posted January 9 Hi @plswelcomeroh This is expected. It is the leakage current from the voltage monitor and setting rails. It can be minimize with a dummy load, like 1k resistor. Link to comment Share on other sites More sharing options...
0 plswelcomeroh Posted January 10 Author Share Posted January 10 (edited) Hi Attila, Thank you for supporting it and sorry about that I don't think so. Can you please let me know the device full name of power rail for V+/V-? And if so, what is the maximum expected level for V+ idle? (during the monitoring resolution is 8mV. 192/8=24steps) Thanks in advance. Edited January 10 by plswelcomeroh Link to comment Share on other sites More sharing options...
0 attila Posted January 11 Share Posted January 11 Hi @plswelcomeroh The maximum leakage voltage when the V+ is shut down is 641mV and with 1k dummy load max is 67mV. The supply circuit's Schottky diode reverse current further reduces this voltage, depending on temperature. On a cold device I see 500mV and after it heats up only 50mV. Link to comment Share on other sites More sharing options...
0 plswelcomeroh Posted January 15 Author Share Posted January 15 Hi Attila, Also I could find 641mv which is too much to use for the lab test for V+. or I have to wait until thermal drift itself. Thank you though. Link to comment Share on other sites More sharing options...
0 attila Posted January 15 Share Posted January 15 Hi @plswelcomeroh Use a resistor (like 1k for max 67mV) to reduce the V+ idle voltage. Link to comment Share on other sites More sharing options...
Question
plswelcomeroh
Hi team,
Can you please check it?
Recently I placed the order and checked V+ output noise of AD3.
However, it is 120mV output offset during V- makes 19mV even though I calibrated newly.
Is it the in range spec? I believe it is NOT normal. Too much high 120mV V+ for lab equipment.
Thanks in advance, can you please update me?
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