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OPA2365-Q1: BMS Voltage sample AMP lectotype

Charles.huang
Intellectual 260 points

Part Number: OPA2365-Q1
Other Parts Discussed in Thread: OPA2365, OPA2322-Q1

Hello,

I have a client who uses OPA2365 and ADS795X to test Voltage sample.

Customers want to replace OPA2365 with cheap ones.

I'd like to ask if OPA2322-Q1 can be used instead.

What are the criteria for choosing an op amp in this application?.

Thanks.

  • 0
    TI__Mastermind 23226 points
    Hi Charles,

    The biggest factor is low input offset, since the shunt voltage being measured can be very small in shunt based current sensors. Low offset drift is also important to maintain accuracy over temperature and minimize difficulty in calibrating out drift error. Input bias current will affect the current through the shunt, affecting the voltage drop. Also, inherent noise can affect the measurement accuracy, especially when configuring the amplifier with higher gain.

    In this case, the OPA2322-Q1 has 10x the Vos (2V vs. 0.2V), almost double the drift (1.8uV/C vs. 1uV/C), and more noise (8.5nV/rHz vs. 4.5nV/rHz).

    Best regards,

    Sean