ADS1299: The cal_amp problem of ADS1299

hongyuan Fu

Part Number: ADS1299

when I set the conf register to 0xd5, the ch1 register to 0x05, using internal reference. The signal's amplitude is around 7.5 mV, which is not the same as 2x-(Vrefp-VrefN)/2400 in the datasheet.

22 天前

0 Eirwen 22 天前

TI__Mastermind 30085 points

Hello, we have received your case and the investigation will take some time. Thank you for your patience.

0 Eirwen 21 天前回复 Eirwen

TI__Mastermind 30085 points

Please refer to basic debug steps posted to our BIOFAQ page on E2E.

0 hongyuan Fu 21 天前回复 Eirwen

Prodigy 110 points

I have read this link [常见问题]关于TI ADS129x系列生物势ADC的常见问题 - 数据转换器论坛 - 数据转换器 - TI 端对端支持论坛. However, I did not find the solution. If convenient ,could you offer me a link, thanks!

0 Eirwen 16 天前回复 hongyuan Fu

TI__Mastermind 30085 points

Our device expert is out-of-office, so please expect some delay. We will respond to this query the week of December 2nd.

0 hongyuan Fu 4 天前回复 Eirwen

Prodigy 110 points

hello？

0 Eirwen 3 天前回复 hongyuan Fu

TI__Mastermind 30085 points

Thank you for your post. You are observing the correct signal amplitude. The amplitude is calculated as:

Amplitude (V) = 4.5V / 2400 = 0.001875, or 1.875mV. For 2x setting (CAL_AMP = 1), the amplitude will be 3.75mV, which is the same as 7.5mV peak-to-peak.

0 hongyuan Fu 2 天前回复 Eirwen

Prodigy 110 points

ahh, its amplitude...Sorry my fault, take it for granted as Vpp