Capacitance Cds(on)

Hello,

we are using two Multiplexer/Switches ADG1404,ADG1436 to change measurement ranges in an application. While measuring low currents we use a high resistance of about 1MOhm to convert the current into a voltage. The problem that occurs is, that the Capacitance Cds(on) together with the resistance leads to a lowpass-filter with a very low corner frequency.
Is there a way to compensate the internal Capacitance of the switch?

Thanks in advance
Kind regards

Ronny

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  • 0
    •  Analog Employees 
    on Oct 16, 2014 7:50 AM

    Hi Ronny,

    It sounds like you really need a low capacitance switch.  If you are using 1MOhm do you really need to use low Ron switches like the ADG14xx family?  If not I would suggest you look at the ADG1204 and ADG1236 switches which have much lower capacitance (but higher Ron).  The ADG12xx family are optimized for low capacitance.

    Regards,

    Eric.

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  • 0
    •  Analog Employees 
    on Oct 16, 2014 7:50 AM

    Hi Ronny,

    It sounds like you really need a low capacitance switch.  If you are using 1MOhm do you really need to use low Ron switches like the ADG14xx family?  If not I would suggest you look at the ADG1204 and ADG1236 switches which have much lower capacitance (but higher Ron).  The ADG12xx family are optimized for low capacitance.

    Regards,

    Eric.

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