AD7621: Calibrating the zero and full scale error

Question Data Sheet AD7621_pre. In Table 2. Parameter - Zero Error, Tmin to Tmax = +/-30LSB. What brings this error how it is possible to reduce her and up to what value? In how many time increases accuracy of transformation in all a band of temperatures at use of such method of a temperature compensation as shown In Figure 31. Use of the Temperature Sensor (Data Sheet AD7621_pre)? Answer The Zero error or Offset error is the difference between the ideal midscale input voltage (0 V) and the actual voltage producing the midscale output code. You can add or subtract a small voltage at the analog input to cancel this error...or alternatively, once you know the offset at midscale , you can software compensate for it. By using the temperature sensor, you can software calibrate your digital output to take into account changes in zero scale and full scale errors. By knowing the ambient temperature of the board, and the temperature co-efficient for the zero and gain error you can calibrate in your software the digital o/p for changes over temperature for zero and full scale error.

We would like to use the AD7621 or AD7641 in our project.

Q We would like to use the AD7621 or AD7641 in our project. Does the AD7621 can work with SPI interface in 1.25, 2 and 3 MSPS? Does the AD7641 can work with 16 bit and SPI interface in 1.5 and 2 MSPS? A The AD7621 can only use the full 3MSPS with the master read during convert mode serial interface. Using the slave mode will have issues since digital activity will run into more than 1/2 of the conversion cycle unless you can live with some slight performance degradation, namely INL and THD. The AD7641 can use the 2MSPS in serial slave mode since there is 115ns of acquisition time which can be used to read some of the bits and then the remaining bits can be read safely into 1/2 of the 385ns conversion time.

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AD7621 Production
The AD7621 is a 16-bit, 3 MSPS, charge redistribution SAR, fully differential analog-to-digital converter that operates from a single 2.5 V power supply...
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- We would like to use the AD7621 or AD7641 in our project.
- AD7621: Calibrating the zero and full scale error
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