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ADS1015: Input Leakage with MUX Switch Open?

aarmutat
Intellectual 2831 points
Part Number: ADS1015

When the ADS1015 is powered at Vcc = 3.3V, and the mux is configured so the AIN0 switch is open.  What will the leakage current be into AIN0 when AIN0 = 3V?  Thx!

When the ADS1015 is powered, can I open the MUX switches such that AIN0 is isolated from the part’s AFE? If so, what is the leakage current at 3.0V input? VDD would be at 3.3V.

  • 0
    TI__Guru* 95225 points
    Hi,


    I wasn't entirely clear on the setup that you were describing. Let me describe the conditions that I think you're asking about and you can follow up with another question if I've misunderstood.

    For the ADS1015, if the device selects an input, the other input should be isolated by the multiplexer and should basically see a high impedance to the device. I don't have any specific characterization data for this, so I did get out an ADS1015EVM to take a quick look. For this test, I set AIN0 and AIN1 as the inputs, and then tied the unused AIN2 to a variable voltage supply through an ammeter. The input leakage was basically 0 (or low single digit nA) through the entire range of the 3.3V. However, as I got near ground, within 200mV, the leakage did peak up to about 40nA.

    Hopefully that answers your question. If I got the setup explanation wrong, let me know.


    Joseph Wu