Last week I was busy with making the first proof of concept and establishing communication between ADC, uController and the host computer. Everything goes smooth and I got first voltage measurements from the ADC. The used parts were:
- USB 5V input voltage
- Low noise LDO TC1108 (3.3V) which is used for supplying the voltage reference
- Voltage reference LTC6655BHMS8 at 2.5V
- ADC LTC2440
- uController Atmega32U4 connected to the ADC via SPI and to the host computer via USART to USB converter.
I was able also to check first week voltage stability using the Keithley 2002 multimeter.
The voltage reference will be switched on 24 hours none stop next 5 weeks (which will be ~1000 hours including the last week) to get more stable results.
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