Off State Leakage of ADG201A-EP

I know from datasheet of ADG201A-EP that the maximum OFF state leakage of this IC with power supply =+/-15V and VD = ±14 V, VS = ∓14 V is 100nA. This leakage is too much for the circuit that I am designing. But the input signal range in my application is much less that that is given in the datasheet. Power supply to this IC is +/-15V. The input signal range will be +/- 2V. I would like to know what will be the maximum OFF state leakage for this IC over the operating temperature range of -55C to 125C for this input range? Will there be a reduction from the datasheet values?

Thanks

Shihab.

  • 0
    •  Analog Employees 
    on Jan 24, 2018 11:02 AM

    Hi Shihab,

    Thanks for the interest in our EP parts.  If you have a look at the regular ADG201A datasheet you will see a leakage plot.  Notice the log scale for leakage and as you increase in temperature the leakage increases. This is the dominant affect.  I don't have data for your conditions but my feeling is reducing the signal range may only have a minor effect in this case due to the high temperatures needed for EP parts. 

    Have a look at the ADG1212-EP as an alternative.  It has much lower leakage levels. 

    Regards,

    Eric.

  • Hi Eric,

    Thank you for the reply.

    As per Digikey, Mouser this part (ADG1212SRU-EP-RL7) is " Scheduled for obsolescence and will be discontinued by the manufacturer". Do you have any other part which is recommended for New design(or in Production) which have leakage spec <30nA over operating temperature from -55C to 125C.

    Thanks,

    Shihab.

  • 0
    •  Analog Employees 
    on Jan 24, 2018 4:36 PM

    Hi Shihab,

    Good point. I just double checked here on the ADG1212-EP obsolescence. There is a pin for pin compatible replacement planned that will be a Pb-free version "SRUZ-EP-RL7".  That will be a bit later in the year. So the ADG1212 may still be an option for you. 

    As alternatives.  If you need a QUAD SPST. Here are two other options will low leakage that would be worth considering.

    ADG5412F-EP

    ADG613-EP (note this is a lower voltage switch)

    I hope this helps.

    Regards,

    Eric.

  • Hi Eric,

    I have downloaded the spice model of ADG1212 and tried some simulation. As per a basic simulation to check the leakage current ( channel to channel), I am getting large leakage currents. Following is the simulation circuit. Can you please explain why I am getting -187.5mV across R1. The leakage current seen into D1 is 1.875uA. As per datasheet the OFF Leakage over the operating temperature shall be no more than 1nA.

    Thanks,

    Shihab

  • 0
    •  Analog Employees 
    on Feb 5, 2018 4:27 PM

    Hi Shihab,

    I agree with David, it seems that you are trying to short +5V and -5V (even with 10k resistors) in a single node, when the switch is turned on? Can you share more info about your application?

    With regards to off leakage measurement, the setup above shows no connection to IN3, therefore switch 3 (S3 to D3) is not a valid off state. So current measured at R1 (which is connected to S3) is not a valid off leakage.

    To measure off leakage see figure 21 in the ADG1212 data sheet as a reference.

    Best Regards,

    May