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IVC102: Question on timing for S1 S2

GUido Schwartenbeck
Prodigy 10 points
Part Number: IVC102

Hello,

I'v got a question regarding the timing of the two switches S1 and S2. I wont to use the IVC102 wit a variable integration time. I will do the following:

  • apply sensor signal by closing S1
  • wait until  output of the IVC201 reaches a defined value, using a comparator, and count the time
  • then open S1
  • wait for time 1 (holding time in the data sheet)
  • close S2
  • wait for 10µs to discharge the integrator
  • open S2
  • wait time 2 (pre integration time in data sheet)
  • open S1 for next cycle

Now my question, I'd like to make the time 1 and time 2 as small as possible. When I have a look on  the slew rate of the amplifier the data sheet says 3v/µs. so my max. output voltage will be arround 2V, so would it be OK, if time 1 and time 2 are 1µs?

Kind regards

Guido

  • 0
    TI__Mastermind 25895 points
    Hi Guido,

    Looking into this.

    Best,

    Alex
  • 0 in reply to Alex Bhandari-Young
    TI__Mastermind 25895 points
    Hi Guido,

    The recommended pre-int time in the data sheet is 10us. It says: "This pre-integration hold period assures that S2 is fully open before S1 is closed so that no input signal is lost"

    For both pre-int and hold time I would refer to the datasheet sections for those operations. For hold time it states: "Approximately 5µs after S1 is opened, the output voltage is stable and can be measured" but there are also more details in the datasheet section.

    You may be able to go lower depending on your conditions, but you will have to test to make sure it is okay as I cannot guarantee outside the datasheet recommendations.

    Best,

    Alex