Kinetis MicrocontrollersのトピックRe: K66 ADC Differential Mode

K66 ADC Differential Mode

christhomas — Fri, 10 Mar 2017 19:26:42 GMT

Hi,

In the data sheet for the K66P144M180, it states that

The 16-bit accuracy specifications listed in Table 1 and Table 32 are achievable on the differential pins ADCx_DP0, ADCx_DM0.

Does this mean that the ADCx_DP3/DM3 do not satisfy 16-bit accuracy.

Thanks!

Re: K66 ADC Differential Mode

Hui_Ma — Tue, 14 Mar 2017 06:34:14 GMT

In fact, the K66 ADCx_DP3/DM3 with the same accuracy performance with ADCx_DP0/DM0 in differential mode.

There with one document error, the correct description is:

The 16-bit accuracy specifications listed in Table 31 and Table 32 are achievable on the differential pins ADCx_DP0, ADCx_DM0.

The ADC table31 and table32 specification was measured from the ADCx_DP0 and ADCx_DM0 in differential mode.

Thank you for the attention.

Have a great day,
Ma Hui
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Re: K66 ADC Differential Mode

christhomas — Tue, 14 Mar 2017 17:16:19 GMT

Thank you for your answer. A follow up question, looking at the data sheet I can see that

Pin 28 corresponds to ADC0_DM0, but I cant find any pin that is assigned the counterpart ADC0_DP0???

Re: K66 ADC Differential Mode

Hui_Ma — Wed, 15 Mar 2017 07:52:08 GMT

You are right.

The K66 product 144 pin package doesn't provide ADC0_DP0 pin.

So, if customer want to use ADC in differential mode, please consider to use below pins:

ADC0_DP3 & ADC0_DM3

ADC1_DP0 & ADC1_DM0

Wish it helps.

Re: K66 ADC Differential Mode

christhomas — Wed, 15 Mar 2017 10:26:27 GMT

Hi Hui,

Thank you so much again.

I am guessing then it is only possible to use one differential pin since ADC1_DP0 and ADC0_DP3 are shared on the same pin.

So I can not use two differential analog inputs?

Chris

Re: K66 ADC Differential Mode

Hui_Ma — Wed, 15 Mar 2017 23:27:42 GMT

You are right.

There with only one pair of differential analog input pins.

So, you can not use two differential analog inputs at the same time.

Wish it helps.