I am looking for 4:1 switch which is required for switching input signal over 4 channels.
The input signal has 10ns of rise time and 20ns pulse duration with duty cycle of 1%.
We want to use this input signal for further pulse processing and hence…
I am going to use the ADG1204 in my design, but one of the channels (S4) is not to be used. I am planning to terminate it to ground to avoid noise.
Should I do that? Or Will it be ok if I left it open?
Thank you for your time.
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…
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…