Hello E2E,
I am working with the OPA1622
I've configured it in the lab and am seeing approximately 1.5V between the peak output and the supply rails (0 & 13.5VDC)
Below is the test circuit that i designed to help verify the OPA1622's fit in our design.
I am intentionally saturating the opamp, and see it railing within 1.5V of the supply.
I feel like I'm probably missing something obvious, but why is there about 1.5V of headroom? The "Voltage Output Swing from Rail" parameter within the datasheet is listed as between 800-900mV depending on load. Isn't that the "headroom" of the opamp? What's causing the extra 600-700mV of cutoff? The input signal is only 1kHz, so that is far away from cutting out Vout.
ch1-yel: input to amps (not applicable)
ch2-blu: VCC rail
ch2-ppl: output 1 within the OPA1622
ch2-grn: output 2 within the OPA1622
cursors used to show headroom.
(CH2,3,4 all centered on same spot, ch1 centered in middle of screen)
R_LOAD is approximately 80ohms at the moment
Thanks for the help!
Regards,
Russell