Other Parts Discussed in Thread: ADS1299, ADS1299EEGFE-PDK
Tool/software:
Hello, I have designed an EEG amplifier by using ADS1299-4.
The system has an AD1299 and a Bluetooth chip NRF52840.
- Ads1299 analog supply AVdd is 5V
- Ads1299 analog ground Avss is 0V
- Ads1299 digital supply DVdd is 3.3V
- Bluetooth digital supply DVdd is 3.3 V
the problem I face is that I cannot get required voltages from Vcap 1 - 2 - 3 - 4 pins and Vref -
Required Read Vcap1 Avss+1.2 0.04V Vcap2 (Avdd+Avss)/2 0.3V Vcap3 Avdd+1.9 4.19V Vcap4 (Vrefp+Vrefn)/2 0.5 V Vrefp 2.5 0 V
If someone can help me to understand the source of the problem, that would be great for me.
Best Regards