Trying to verify the power down mode (unity gain) of the OPA 2836, I came up with a problem. I expected to find the output in high impedance state, as it referred in data sheet. Nonetheless I found violations on maximum differential input voltage and maximum continuous input current and I wonder if I have to consider it in power down mode. In more details:
- Supply voltage: 5VDC, unity gain non inverting topology, non inverting input connected through 560R to ground, output connected through 470R to +5V:
Measured: 1.62V on non inverting input (input current: 2.89mA), 3.69V on output (differential input voltage: 2.07V).
- Supply voltage: 5VDC, unity gain non inverting topology, non inverting input connected through 560R to 4V, output connected through 470R to ground:
Measured: 2.87V on non inverting input (input current: 5,12mA), 0.95V on output (differential input voltage: 1.92V).