AD8620 vs. AD8066

[Crazy_D]

Please give the pro's and cons to these two great op-amps.
The first con of the AD8620 is the price, but if the performance is better, no problem.

Would it be wise to decouple the V+ and V- with about .16uf oil cap?? Any other values seem to work better?

The application will be for a/d inputs.


Thanks!

[peranders]

Originally posted by Crazy_D
Would it be wise to decouple the V+ and V- with about .16uf oil cap?? Any other values seem to work better?

Not very, I'll suspect. You should use caps with very good HF properties. I recommend SMD 0805 100 nF/ 50V XR7 or other ceramic type. 100 nF/63 polyester will do also probably. Use physical small caps.

[krishu]

Hello,

as I read in the analog letter I got yesterday, the ad8066 hat a much higher slew rate than ad8620, the latter one has less DC offset. there are also differences in distortion and maximal output swing. Biut soundwise ...?

I soldered both onto IC sockets and will try/compare both on weekend. I will report on monday probably.

Cheers
Christian.

[krishu]

Hello,

I burned in the AD8066, too and compared it (quickly) to the AD8620, which has been burned in moire intensively. I liked the sound of the 8620 more, it seems to be closer to what I feel is music. AD8066 was more like my double OPA627

I will listen to both again and more extensively when I have the time to do so. I will report here only if my judgement changes.

Cheers
Christian.