Other Parts Discussed in Thread: INA302, INA303
Hello,
We are considering implementing the INA381 in a design and have two questions.
1) We are planning to use a large RC filter (1M + 2.2uF) between Vout and CMPIN to filter out load transients in our application. However we're concerned about the undocumented comparator input bias currents creating error over this resistor. Could you provide the comparator input bias currents of this device?
In another thread it is reported that the comparator input impedance is "hundreds of MΩ", which suggests the 1M resistor should impose minimal (1% max) error. However, we're not sure if this impedance figure takes includes the bias currents.
We're aware that the internal 4uA current source to provide hysteresis and the 1M resistor will cause the ALERT signal to latch low once asserted until the power is cycled. This is acceptable in our application.
2) In simulation when ramping the supply voltage rail that powers Vs+, CMPREF, and the ALERT signal while there is already an input signal to the amplifier, we are seeing OUT glitch high and thus ALERT glitch low during startup. Is this accurate? Figure 31 in the datasheet does not show this behavior.
Thank you.
