16-bit Analog Input

[JRiemann]

I have a Power PMAC Clipper which comes with 12-bit analog inputs with -10->+10 V range. I have a sensor that provides a 16-bit analog output with 0-10 V range, which I've connected to 1 of the 12-bit analog inputs on the Clipper. I've having problems with signal noise, which I believe is due to the 12-bit resolution of the analog input. Is there a recommendation to achieve better resolution so I can get the full benefit of the 16-bit analog output?

 

By the way, I'm validating the accuracy/resolution of the 16-bit analog output by using the serial output on the sensor. Perhaps using the serial output is a better option but not sure how I'd integrate that within PMAC.

[steve.milici]

The difference in resolution is not an issue as PMAC only sees a 10V signal at its 12 bit resolution regardless of the sensor's resolution. These analog inputs are typically very clean. Make sure your wiring is shielded twisted pair. Also wire the shield drain at the analog input only.

 

What is the serial output protocol?

[DaveBarnett]

If your problem really is just 12 bit quantization noise (and not something else), then you might consider using an oversampling/averaging technique. Each doubling of the samples will yield 6db improvement in quantization noise.

 

'Classic speed/resolution tradeoff applies.

 

see:

https://www.silabs.com/Support%20Documents/TechnicalDocs/an118.pdf

[steve.milici]

Also note that our 16 bit analog input accessory, ACC-28B, can be used with the Power Clipper. Contact our technical support group for details:

support@deltatau.com

[sdnsdn1234]

Connected analog input 0 to 10Vdc to the In put of ADC1. let me know the best interface circuit for external analog input connection to the PMAC ADC

[steve.milici]

Connected analog input 0 to 10Vdc to the In put of ADC1. let me know the best interface circuit for external analog input connection to the PMAC ADC

 

You can directly connect to this input.