I have the NEW OPA858 EVM on my bench with a signal being fed to the input and I see no gain. I see a signal with unity gain.I can move the PD jumper to low and the output drops to zero.
The paperwork says it should have the gain set to seven. My power supply is plus VCC of 2.2 volts and minus VEE of 2.2 volts dc with a ground in between. The schematic shows it is set up in single ended mode with R3 shorted to ground I checked it and this is true. I have an input signal on J2 of +/- 350mv square wave 20KHZ and I am seeing an output of +/349mv.
I think there is a BooBoo on the board - I checked all the resistances and found R4 = 68 ohms, R2 = 187 ohms ?, R6 = 132 ohms and R7 = 65 ohms.
R2 on the schematic should be 453 ohms to get a gain of 6. R2 is a 403 size resistor with no writing on it.
You would think I should still get a gain of 2.
Did I get a dud? Or am I doing something wrong?
Thanks,
Dan