AD8351 saturation output voltage is inconsistent

Question

Hello ADI, 
 Our customer used AD8351 in a project. This project required saturation output of the AD8351. However, when AD8351 is saturated, the INH/INL voltage waveform of the same batch of AD8351 is very inconsistent. I checked the manual and there was no introduction to saturation output in the manual. Please refer to the schematic diagram and waveform below. Is this normal? Thanks .

salemdar · Accepted Answer

Hello, 
 
 Could you please tie VOCM to a defined voltage rather than only decoupling to GND with a cap? Maybe it is already tied to a defined voltage, but not visible on the schematic you shared. 
 
 Thanks)

salemdar · Answer

No it doesnt. Wanted to make sure that it stays at Vsupply/2 which is the default case for the part. If Vcm goes to limits, swing headroom might change. 
 The minor imbalance you observe is probably caused by the load conditions such that impedance seen at INH might be higher than the INL

Electronic Design Services - PartnerZone

Products In This Thread

AD8351 saturation output voltage is inconsistent

Thread Notes

Top Replies