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Questions about the Driver — HIGH RESOLUTION ADC USING MICROCHIP MCP342X


#1

The website shows the Programmable data rate options for 18bit resolution is 3.75 SPS.
Does it mean the sampling time is limited to 1/3.75 seconds?
http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en536354

Thanks


#2

It will help much if you add a link please.


#3

oh,
http://code.tinyclr.com/project/369/high-resolution-adc-using-microchip-mcp342x/


#4

18bit is the resolution, the accuracy. Normally, ADCs are capable of thousands of samples per second.


#5

But I don’t real understand the SPS mean

Programmable data rate options

  • 3.75 SPS (18 bits)
  • 15 SPS (16 bits)
  • 60 SPS (14 bits)
  • 240 SPS (12 bits)

#6

The lower the resolution the faster the sampleing but 240SPS doesn’t sound right! It should be much higher! If it is true, this is the slowest ADC I have seen in my life.


#7

I just check the datasheet and you are correct. It is that slow!


#8

If you can go SPI instead of I2C then I would suggest:
http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en024598

It is 60 samples per second and 22bit resolution…