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AD7715 Datasheet(PDF) 26 Page - Analog Devices |
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AD7715 Datasheet(HTML) 26 Page - Analog Devices |
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26 / 41 page  Data Sheet AD7715 Rev. E | Page 25 of 40 If the part is used in unipolar mode with a required span of 0.8 × VREF/GAIN, then the offset range which the system calibration can handle is from −1.05 × VREF/GAIN to +0.25 × VREF/GAIN. If the part is used in unipolar mode with a required span of VREF/GAIN, then the offset range which the system calibration can handle is from −1.05 × VREF/GAIN to +0.05 × VREF/GAIN. Similarly, if the part is used in unipolar mode and required to remove an offset of 0.2 × VREF/GAIN, then the span range which the system calibration can handle is 0.85 × VREF/GAIN. If the part is used in bipolar mode with a required span of ±0.4 × VREF/GAIN, then the offset range which the system calibration can handle is from −0.65 × VREF/GAIN to +0.65 × VREF/GAIN. If the part is used in bipolar mode with a required span of ±VREF/ GAIN, then the offset range which the system calibration can handle is from −0.05 × VREF/GAIN to +0.05 × VREF/GAIN. Similarly, if the part is used in bipolar mode and required to remove an offset of ±0.2 × VREF/GAIN, then the span range which the system calibration can handle is ±0.85 × VREF/GAIN. Power-Up and Calibration On power-up, the AD7715 performs an internal reset that sets the contents of the internal registers to a known state. There are default values loaded to all registers after a power-on or reset. The default values contain nominal calibration coefficients for the calibration registers. However, to ensure correct calibration for the device a calibration routine should be performed after power-up. The power dissipation and temperature drift of the AD7715 are low, and no warm-up time is required before the initial calibration is performed. However, if an external reference is being used, this reference must have stabilized before calibration is initiated. Similarly, if the clock source for the part is generated from a crystal or resonator across the MCLK pins, the start-up time for the oscillator circuit should elapse before a calibration is initiated on the part (see the Clocking and Oscillator Circuit section). |
Similar Part No. - AD7715_17 |
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Similar Description - AD7715_17 |
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