hi,
i have interfaced ADC0808 with AT89c51 and i see the IN0 pin of ADC shows 2.5V. I have not connected any sensor to it.Some say that the pin is open drain and hence there is 2.5V. I like to know whether it usually shows this voltage or is there any problem with my circuit.
Also I have designed circuit with sensor. I use a platinum 100(PT100) RTD for sensing temperature and designed it such a way that the output voltage varies from 2.5V-5V. But the actual voltage range I need is 0-2.5V.can anybody help me how to scale the voltage from 2.5V-5V to 0-2.5V.
Thanks
Kumara.
i have interfaced ADC0808 with AT89c51 and i see the IN0 pin of ADC shows 2.5V. I have not connected any sensor to it.Some say that the pin is open drain and hence there is 2.5V. I like to know whether it usually shows this voltage or is there any problem with my circuit.
Also I have designed circuit with sensor. I use a platinum 100(PT100) RTD for sensing temperature and designed it such a way that the output voltage varies from 2.5V-5V. But the actual voltage range I need is 0-2.5V.can anybody help me how to scale the voltage from 2.5V-5V to 0-2.5V.
Thanks
Kumara.