ADATE318 datasheet(69/80 Pages) AD

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ADATE318

Rev. 0 | Page 69 of 80

Calculate

















LSB

DAC

Actual

Offset

768

Calculate volts



















LSB

DAC

Actual

LSB

DAC

Calibratio

Post

The above procedure places the DAC’s theoretical 0x0000

output at −2.5 V and its theoretical 0xFFFF output at 7.49985 V

(1 LSB below +7.5 V). The useful range extends from below

0x199A (−1.5 V) to above 0xE666 (+6.5 V), a span of at least

52,428 actual DAC codes.

An alternative calibration approach can be used to map all 216

DAC codes onto the part’s specified output range by mapping

the zero-code to −1.5 V and the full-scale code to +6.5 V.

Repeat Step 1 to Step 4 above.

Calculate



535







Calculate the offset from the desired −1.5 V.





Offset





Calculate DAC

















LSB

DAC

Actual

Offset

768

Calculate

536



LSB

DAC

Calibratio

Post

Volts

Although this second approach gives an apparent 16 bits of

resolution covering the full signal range, it must be kept in

mind that this is achieved purely by mathematical alteration of

the DAC data. The DAC’s internal LSB step size is not changed.

In this example, the number of internal DAC codes used to

cover the signal span remains roughly 52,428 even though the

number of user codes has increased to 65,536. A consequence

of this is that apparent DNL errors are increased as more input

codes are mapped onto the same number of DAC codes. While

the second calibration method is included here as an example of

what is possible, its use can provide a false sense of improved

accuracy and it is therefore not recommended.

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