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ADS7028: ADC with RMS module

Part Number: ADS7028
Other Parts Discussed in Thread: ADS7138, , ADS7128

Hi Team,

Our customer is looking for an ADC that can output true RMS voltage in a similar way to the ADS7028. He needs one that has higher resolution output than the ADS7028 and is recommended for gas concentration measurement or high accuracy applications. I have checked the parametric search tool under ADC products but there is no option to filter the devices with RMS module. Aside from the ADS7028, ADS7128 and ADS7138, do we have an ADC with RMS module and has SPI interface? 

Regards,

Danilo