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INA186-Q1: maximum delay

Shinji Tsuji
Genius 13158 points
Part Number: INA186-Q1
Other Parts Discussed in Thread: INA186

Hi team,

From the functional safety purspective, I would like to know the maximum input to output delay of INA186A2-Q1. 

I think the bandwidth of the device is 37kHz typical and the delay seems ns order, It should be around 30us(typ). 

How much is the max tolerance of this delay?

Actually <1ms is more than enough, so <x10 variation is acceptable. 

regards,

  • 0
    TI__Mastermind 31245 points

    Hello Shinji,

    Would you please provide more information on this step response and the state of the INA186 during? The delay time will be significantly affected if the device's VOUT is starting in saturation (i.e., not in the linear region).

    Another critical aspect is how large the step input is. If you have a large step (e.g., Vout starts at 200mV and ends at 3V), then device will enter slew mode, where Vout speeds is limited by the slew rate (0.3 V/µs typical).

    Assuming Vout is always linear, you could try to theoretically calculate delay and/or settling times by assuming a conservative +/-25% variation in BW and in slew rate.

    I would recommend simulating the step response as a starting point.

    Sincerely,

    Peter