ADS1018: SNR

Brian Wang0928

Genius 14210 points

Part Number: ADS1018

Tool/software:

Customer would like to estimate SNR value for ADS0108. Could you help on this! Very thanks.

Regards

Brian

11 months ago

0 Bryan Lizon86 11 months ago

TI__Guru 53096 points

Hi Brian Wang0928,

Can you help provide feedback in the Notes section of the Thread Tracking Toolkit?

-Bryan

0 Angel Rodriguez de San Miguel Bermudez 11 months ago

TI__Expert 8130 points

Hi Brian,

Why is this needed?

The ADS1018 is typically intended for DC measurements, as it has a slow max data rate of 3.3kSPS. SNR is an AC specification, which is why this spec is not specified in the data sheet.

SNR is an AC specification, that measures how clean or noise-free a signal is. An AC signal is applied to the ADC and then compared to the noise floor in the frequency domain.

The ideal ADC SNR equation is defined as SNR(dB) = 6.02 * N + 1.76, where N is the number of bits.

In theory following this equation, I guess you could say the SNR is about 74dB as this is a 12-bit ADC.

You can learn more about SNR in the following precision labs training video: AC & DC specifications: Offset error, gain error, CMRR, PSRR, SNR and THD | Video | TI.com

Best Regards,

Angel

0 Brian Wang0928 11 months ago in reply to Angel Rodriguez de San Miguel Bermudez

TI__Genius 14210 points

Thanks Angel.

The application is for temp sensing on motor, and temp is a low speed response.

it looks that the AC performance is not critical to low speed ADC. I’ll communicate if any other concerns.. Thanks!

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ADS1018: SNR