Dual Slope ADC using Microcontroller and Discrete components

[ex4]

dual slope adc

Hello
anybody can give me some resource on how to make a dual slope adc using discrete components (Op amps, resistor, etc) and it's interfacing using microcontroller. Any micro will do. I like the simple and stability performance of the adc.
Gracias

 

[ravimarcus]

adc using discrete components

Microchip application note AN700 will give you delta sigma ADC with 16C622. It can be modified to suite 16F628A.

Cheers

Ravi

 

[nikhil_damle]

microchip an700

Microchip has the product line that has microcontroller & ADC As AN700 & this link will be useful to u https://ww1.microchip.com/downloads/en/DeviceDoc/21841b.pdf

 

[ex4]

simple dual slope adc

well, that's really helpfull
but unfortunately my application need the stability measurement, since i want to measure a 1uV change in the input from 10 ton load cell.
I'm using Sigma delta ltc2440 now and it's quite unstabil, and i look at the same circuit that can handle the sensor. It only uses dual slope adc with 2 opamp and 1 cmos multiplexer. That's is very..very economical
And it's very stabil and can read that small amount of voltage....
Oh yeah, I got this dual slope adc circuit
Got any suggestion on how to make itu single supply???

 

[CMOS]

dual-slope adc

Check this
**broken link removed**

It has schematic for unipolar measurements too.