Hi, Can you describe how you replaced the amplifier? The OPA2828 is a 8 pin HVSSOP, and the TPA2681 is a 5 pin SOT23. Are you just using wires to connect the pins? Please make sure: DAC IOUT is connected to TPA pin 4 (-In) GND is connected to TPA pin 3 (+In…
Thanks for the reply Art.
Art Kay said: Mismatch of the resistors and capacitors on the first stage could cause system CMRR issues.
This is still one of our hypotheses. And the observation that stacking the resistor network improved the CMRR by nearly…
In addition to OPA2211, you could also consider OPA2828 with slew rate of 150V/us. If offset and drift are also critical, OPA2189 chopper with max offset of +/-3uV and drift +/-0.02uV/C could also be a good choice.
Part Number: OPA828 Other Parts Discussed in Thread: OPA627 , OPA140 , OPA2828 , OPA827 Hello,
We have legacy TIA for photodiode that was using OPA627. TI lists OPA828 as being a "drop-in" replacement for it however after just swapping OPA627 to OPA828 device…
