Interesting to know the new batch of Z2 employs 4562. The old batch used 2604.
Perhaps, you may want to take a look at the OPA1662. It's less noisy than OPA1652 and it's more power efficient. However, you may as well want to check the input resistance to it. If it's > 5K, you may want to go for 1652 instead. Pls check the datasheet for detail. For 49720, you may want to try the metal cap version, LME49720HA or you may want look for LME49990 x 2 (you need 2 to work, pls check carefully). Moreover, you may want to get your hands onto the MUSES 8920, which some said it's the so-called downgraded MUSES01.
Just from the top of my head. There should be a long list.
Thanks for chiming in... much appreciated!
I took a look at the OPA1662 and there was a recommendation on the page for the OPA1692 ('To achieve lower distortion at much lower power consumption (650µA/ch) for wireless microphones and USB audio applications')(http://www.ti.com/product/OPA1692)... a better/upgraded version?... besides lower power consumption I am not sure that wireless microphones and USB audio applications are relevant to this situation.
I have taken a look at a few primers for how to read opamp datasheets and have tried to make sense of what I am looking at ... (I have to admit that most of it doesn't make any sense)... but I will keep reading.
When you refer to input resistance >5K, are you referring to 'common mode' or 'differential'?
This is what I found for the OPA1662/OPA1664:
Differential 170 || 2 kΩ || pF Common-mode 600 || 2.5 MΩ || pF
Thanks again for your help!
Last edited: