Customer would like to use OPA4322AIPWR for the 2nd source of the TLV9064IPWR. here list is comparison table.
The OPA is being used for the signal conditioning for phase current from Hall sensor module. Is there any behavior different on both devices based on slew rate/Input capacitance of the OPA...?
Application: Servo Motor Drive (Working freq. 10KHz)
Topolgy:
Phase Current -> Hall Sensor -> OPA -> R/C filter-> MCU
Hi Brian,
Your timing is really great for this. We just released the OPA4323IPWR and I would recommend choosing that over the OPA4322.
Both devices (OPA4323 and TLV9064) have different input capacitances. Though both are pretty close to one another.
OPA4323 input capacitance:
TLV9064 input capacitance:
Also the OPA4323 has a faster slew rate compared to the TLV9064. OPA4323 = 33V/us. TLV9064 = 6.5V/us. So there's quite a big difference between these slew rates.
I'm not too familiar with the range of the input common mode the customer is planning to use in their system but the OPA4323 has the added feature of being a zero-crossover amplifier, aka, it's offset voltage won't shift drastically when the input common mode voltage moves close to the positive supply rail like what is seen in many other op amps.
Has the customer run simulations on their circuit to verify that OPA4323 or OPA4322 would be a good substitute? I always recommend running simulation to see how it performs and verify stability.
Best Regards,
Robert Clifton
