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OPA2156: rising and falling slew rates

Kenji Ohno1
Genius 5095 points
Part Number: OPA2156

Hi Team,

It is a regulation of Typ.40V/us of slwe rate. Is there a difference in rising and falling slew rates?

If there is a difference in the same conditions, how much is that?
Let me know what you think about the conditions described in the datasheet.
Best Regards,
Kenji
  • 0
    TI__Genius 10850 points

    Hi Kenji,

    Slew rate is measured by applying a large signal step to the input of the amp and measuring the rate of change from 10% to 90% of the output signal's amplitude. The data sheet "Large-Signal Step Response" is an indication of the amplifier slew rate. We share this graph in the datasheet (Figures 36 and 37) so you can see both the rising (positive) and falling (negative) slew rates. 

    The OPA2156 also has a slew rate limit for input protection. This is described further in section 8.1.1 of the datasheet. Basically, there is one amp internal to the device which provides slew-rate control for applications that require symmetrical slew-rate (rising positive slew rate = falling negative slew rate = 40V/µs).

    -Tamara Alani