ADA 4627 (ADA4627-1) outperform Burr Brown's OPA 627 (OPA627)

[tiefbassuebertr]

Originally Posted by fjc

Test on sonic difference,
Anyway, I made listening test on ADA4627 Brz and 4637 Arz.
Sonically they are not much difference. Check the spec, 4627 has a 18 V/us slew rate, normally this should be enough for an audio purpose OP. 4637 has much faster slew of 100s. My feeling is the resolution of 4637 is slightly better,but the major difference is the sense of the instrument locations. It is more alive and sharper image for 4637. In other words, 4627 is more flat. I vote for the 4637, even it is a cheaper A version used.

These differences correspond to those, which I have in mind from the 80s - by a listening test between Raytheon's OP27 and OP37 in the TO outline - go to
OP-37* datasheet and application note, data sheet, circuit, pdf, cross reference, pinout | Datasheet Archive
and
OP-27 OP-27 Noise Operational Amplifier Very noise Spec | Datasheet Archive
for download the associated datasheet.


BTW I am still looking for the internal schematic of ADA4627/4637.