My company is using the AD7195 for its industrial weighing equipment. Is there another more recommended converter for weighing applications? Less noise, more precision ...
For weigh scale designs, we usually recommend AD7190 or AD7195 if the customer wants low speed, very low noise and integrated PGA. But if you want alternative parts for high speed weigh scales, the AD717x series such as AD7172-2, AD7175-2, AD7177-2 are useful, however external PGA will be required. So, the part we recommend really depends on the customer's requirements.
OK, thank you for your reply Jellenie, I´ll try this parts in my next design, but I´ve a doubt. We use integrated circuits such as AD7195 or AD7730, with AC excitation of the load cell, due to its low thermal drift. The AD717X ICs do not have AC excitation. What is the best way to compensate for these thermal drifts with DC excitation? Registering temperature and compensating? By hardware?.
So, Is there an schematic example of weigh scale using AD717X?Regards.
The ADC does not perform temperature compensation of the external sensor, If you wish to perform compensation for temperature drift, this needs to be done in the processor/microcontroller. We do not have available reference circuit for AD717x, but I think you can use http://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0216.pdf as your reference. It incorporates zero drift amplifiers for auto correcting any dc errors. You may also want to take a look at these available reference circuits for other parts. http://www.analog.com/en/applications/markets/instrumentation-and-measurement-pavilion-home/weigh-scales.html
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