Hi Chen Jiao,
The best replacement for the LHV870 seems to be the LME49860 and it comes in a 8 pin SOIC package. Is that pin-to-pin for the package you are currently using?
As far as replacing the LM6588, I would look at these:
LMV881
OPA551,…
The attached presentation is where much of the methods for choosing the right R-C and Op Amp to drive a CDAC SAR converter were derived from. Look it over to help understand where the rules of thumb for op amp BW came from.
Let us know after studying…
The OPA145 also looks like a good choice, this file has not been recently updated so the OPA196 is not in yet, and the pricing is out of date.
OPA111A options.xlsx
to User473,
I searched all the op amp portfolio with the parametric search (precision, general purpose, and high-speed). There are 6 options with temperatures of 150C and above (see attached). The best match is the OPA211-HT (210C max). This is the…
