Other Parts Discussed in Thread: THS4531
We have tested the following circuit for evaluate the THS4531AID (SOIC8) as interface ( attenuator and single ended to differential converter ) for an ADC with differential input
As is explained in the datasheet we have connected the PD pin to +5V and Vocm leaved unconnected
We observed that the Vout+ pin remains at +5V voltage level and Vout- at 0 voltage level regardless the voltage level of TP1
If we connect the PD pin to GND with Vocm leaved unconnected, both Vout+ and Vout- changes depending on voltage level on TP1 and the gain (R1/R2) , (R6/R4) but we have also voltage level changes on the Vocm Pin
the same behaviour is observed also with dual power supply ( +2,5v / -2,5v )
the questions are the following:
Which is the correct logic level of PD pin ?(it seems that works in reversed logic) , there is something wrong on this circuit ?