What are you talking about? Why 1s?So with this ADC for the signal to be completely sampled,i need to wait 1 second? If i read the adc faster than 1 second it will result in undersampling?
Drop a zero.1 MSPS i guess it means 1000 0000 samples/ second
Hello,
i am working on a application where a shunt current voltage is measured.
The signal trough the shunt, has a frequency of 40khz
I want to use ADC121S101 which has 1 Msps at 12bit.
My question is, if i read the adc with a speed of 1000hz, what will be the resolution of the measured signal?
I am unsure, but 1 MSPS i guess it means 1000 0000 samples/ second. but if i read with a speed of 1ms, the true resolution will be 1ksps ?
Hello,
1 MSPS is 1000 000 , sorry for the extra 0.
The 80ms was coming from the fact that adc has a speed of 1 Msps = 1000 000 samples/second, this means in 80ms it wil reach 80000 samples.
So if i check the adc value at every 80ms, i should have a valid result, since my measured signal is at half the speed of the adc?
I am only intrested in measuring the voltage of the signal
Yes, 1 kS/s time resolution.but if i read with a speed of 1ms, the true resolution will be 1ksps ?
Yes, 1 kS/s time resolution.
The calculation is completely wrong. If you want to sample with 100 KS/s, you need to read every 10 µs. Obviously that's impossible with a small microcontroller.So if i where to sample at least with 100Ksps, then i should read no faster than 100 ms ? If this assumption is correct, then for me to be able to read the adcs with the microcontroler every 1ms, i need a much higher MSPS adc chip ( 100 MSPS adc chip?!?)
If you want to sample with 100 KS/s, you need to read every 10 µs
Mega Samples Per Second i.e. 10^6 samples/second = 10 MHz sampling frequency. It is the maximum sampling frequncy the ADC can sample at. It can sample at less though.1. the "MSPS" parameter what exactly does it mean?
10^6 is not 1 MHZ sampling frequency?Mega Samples Per Second i.e. 10^6 samples/second = 10 MHz sampling frequency
Yes yes, sorry.10^6 is not 1 MHZ sampling frequency?
What's the purpose of the current measurement? Acquiring the average current? Overcurrent protection? ....
I think you lost me here...How much PWM frequent current ripple do you expect?
Sounds feasible with STM32, but will probably consume a considerable share of the available processor power. And where does the large amount of current samples go? If it's the input to a digital controller, what's its sampling rate?Regarding the 10us sampling speed, i was wondering to use a 16bit SPI combined with a DMA in a circular buffer, where i read all the 3 adc's. The mcu device is a stm32f427 clocked at 180mhz
The adc reading will be synchronised with the pwm active edge, for each phase.
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