How to find input impedance of delta sigma ADC in CY8ckit-059?

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RaBa_2451646
Level 2
Level 2
10 sign-ins 5 sign-ins 5 replies posted

Hi All,

I am using CY8ckit-059 like an oscilloscope by using its on-chip delta-sigma ADC. For maximum power transmission from the subject to the ADC I need to know the input impedance of the device.

Is there any way to find it?

Thanks in advance!

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1 Solution
Vasanth
Moderator
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250 sign-ins 500 solutions authored First question asked

Hi Rajat,

The information is available in the PSoC5LP datasheet.

pastedImage_0.png

Best Regards,
Vasanth

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2 Replies
Vasanth
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250 sign-ins 500 solutions authored First question asked

Hi Rajat,

The information is available in the PSoC5LP datasheet.

pastedImage_0.png

Best Regards,
Vasanth

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Len_CONSULTRON
Level 9
Level 9
Beta tester 500 solutions authored 1000 replies posted

RaBa,

As Vasanth indicated the DeltaSigma ADC input impedance is VERY high.   However the cost of such of a high impedance is that the DeltaSigma ADC is slower.  The SAR ADC is faster but the input impedance is significantly lower unless you place a front-end track and hold op-amp between the input and the SAR ADC.

Len

Len
"Engineering is an Art. The Art of Compromise."
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