When VDD of the AD7942 is between 2.3 and 4.5 volts, Tconv is listed as 0.7 to 3.2 us.
1. What determines the conversion time in this case?
2. How is it measured if the signal I need to see is shorter than the minimum conversion time?
AD7942
Production
The AD7942 is a 14-bit, charge redistribution, successive approximation PulSAR® ADC that operates from a single power supply, VDD, between 2.3 V to 5...
Datasheet
AD7942 on Analog.com
When VDD of the AD7942 is between 2.3 and 4.5 volts, Tconv is listed as 0.7 to 3.2 us.
1. What determines the conversion time in this case?
2. How is it measured if the signal I need to see is shorter than the minimum conversion time?
Hi, seeno214 .
Regardless of the VDD, as long as you will what is the given voltage range, the conversion time is fixated to its range. That is the result when the part was tested using the conditions of VDD and VIO. Regarding the 2nd bullet point, can you explain it further what will be measured and what do you want to measure?
Warm regards,
Jo
Thanks for reply.
I am using a current sensor that outputs as a voltage, and the voltage value is only output for a very short time. I was wondering if the measurement will be correct if the voltage is only output for, say, 0.1us and I change the CNV signal to HIGH at the beginning of that pulse.
Hello, seeno214 .
Do you have scope shot or data you can share with us from the output of the sensor? Since you have mentioned about the availability of the signal, did it result to an impulse?
May I also know your specific application and why have you resorted using AD7942?
Regards,
Jo