What supply voltage(s)??
For any analog or digital input, I never leave them floating. You can tie it to ground, but on any
analog parts that run on plus and minus voltages, you may have a problem with power supply
sequencing resulting in…
Hi Sir ,
If the input voltage is over voltage and what is the output status?
I think the internal diode is turn on and output will present to 0.2~0.7 V (Vd) is right?
ADG904 is SP4T switch and ADG918 is SPDT switch. They both has leakage of 0.1uA but you are looking for nA leakage so I think your requirement has ruled out both of these switches.
You can try ADG1204, its 4:1. it has sub nA leakage typical…
I have few questions from this CN0325 circuit. As far as I understand the (U23) ADG1204 mux is used to bias the input - to 2.5v and this is for the thermocouple connection? Why is the AD7795 internal biasing not used?
Second one is that I understand…
It sounds like you really need a low capacitance switch. If you are using 1MOhm do you really need to use low Ron switches like the ADG14xx family? If not I would suggest you look at the ADG1204 and ADG1236 switches which have much lower capacitance…
My idea is having forward settling time less than ADC conversion time.
AD7982 conversion time is 710ns;
To get 18 bit accuracy, ADG1204 transition time plus settling time < 400ns, AD8475 specified the 16 bit settling time 50ns, I guess the…