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ADA4350: On-Resistance

Hello,

I will connect the SWA_OUT pin of ADA4350 with an outside inverting amplifier circuit.

I do not use the ADC DRIVER of ADA4350.

The ADA4350 has the switch, and the on-resistance is hundreds of ohms.

I think that the on-resistance is too large to connect SWA_OUT pin directly with the inverting amplification circuit.

Should I include the buffer between SWA_OUT pin and the inverting amplification circuit?

Best Regards,

Mr.K

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  • Hi, Mr. K.

    For Figure 1, the on-resistance of S0 to S5 will be cancelled in the TIA

    But S6 to S11 will be added to Rg of your inverting amp A.

    To eliminate the effect of S6 to S11, use Figure 2.

    In addition, if pins 1 and 27 are shorted, as shown in Figure 2, short pins 12 and 13 also.

    Regards,

    Anna

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  • Hi, Mr. K.

    For Figure 1, the on-resistance of S0 to S5 will be cancelled in the TIA

    But S6 to S11 will be added to Rg of your inverting amp A.

    To eliminate the effect of S6 to S11, use Figure 2.

    In addition, if pins 1 and 27 are shorted, as shown in Figure 2, short pins 12 and 13 also.

    Regards,

    Anna

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