I would like to ask about the Overload Recovery of AD8627.
There was not mention of it to the AD8627 data sheet.
Would you tell me the information of it?
I will check whether that data is available, and if not, test it out.
Why are you interested in the overload recovery of the device? What is your application?
Thanks for your support.
I'm working with Yuya.
The application is an optical instrument and this amp is used as TIA.
It's important to know this spec, in case a large optical signal happens.
Please confirm if the data is available.
And we need the overload recovery spec tested for both positive and negative inputs.
Thank you for the information!
The plots for overload recovery are attached. These were taken with +/-13V supplies and gain of -10. I measure about 2.5us for negative overload recovery and 2us for positive overload recovery.
Let me know if this meets your requirement. Was there a spec that you are trying to meet?
It looks like the input signal was about 1.75V?? Times -10.1 = 17.5 so 17.5/13 is less than 2.
That's not much overdrive. Repeat with an input signal of 5V or 10V and see what happens.
Hi Kris, Harry,
Do you have any materials ( or links) that explains this spec in detail?
I'm not sure how much input voltage and loop gain are considered overdrive.
Plus, I just wonder why some datasheets mention this spec, and some does not mention.
Is there a reason?
Written by our founder in 1967:
There is no general answer for overload. I had worked with a different part number that had 3us recovery time
with a 2x overdrive, but with a 100x overdrive, took 2 ms. It will depend on the closed loop gain of the op amp,
how hard you drive it into the rail, how hard you reverse the inputs to bring it out, etc. The best system solution
is to use Shottky diodes downstream to clamp the overload so the op amp doesn't get the full overload.
Hi Harryh, Krisft,
Thank you for your support.
The dates you send are very helpful and we will consider closed loop gain when we talk about this spec.
Attaching additional plots for a 5V input. Positive overload recovery is around 2.7us, while negative overload recovery is around 2.5us.
Retrieving data ...