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AD7703 Datasheet(PDF) 6 Page - Analog Devices |
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AD7703 Datasheet(HTML) 6 Page - Analog Devices |
6 / 17 page REV. E AD7703 –5– DATA VALID t 15 HI-Z SDATA CS Figure 5b. SEC Mode Data Hold Time HI-Z DB19 DB18 DB1 DB0 HI-Z SCLK SDATA CLKIN CS HI-Z t 7 t 8 t 5 t 9 t 4 t 8 HI-Z Figure 6. SSC Mode Timing Diagram DEFINITION OF TERMS Linearity Error This is the maximum deviation of any code from a straight line passing through the endpoints of the transfer function. The endpoints of the transfer function are zero-scale (not to be confused with bipolar zero), a point 0.5 LSB below the first code transition (000 . . . 000 to 000 . . . 001) and full-scale, a point 1.5 LSB above the last code transition (111 . . . 110 to 111 . . . 111). The error is expressed as a percentage of full scale. Differential Linearity Error This is the difference between any code’s actual width and the ideal (1 LSB) width. Differential linearity error is expressed in LSB. A differential linearity specification of ± 1 LSB or less guarantees monotonicity. Positive Full-Scale Error Positive full-scale error is the deviation of the last code transition (111 . . . 110 to 111 . . . 111) from the ideal (VREF ±3/2 LSB). It applies to both positive and negative analog input ranges and is expressed in microvolts. Unipolar Offset Error Unipolar offset error is the deviation of the first code transition from the ideal (AGND + 0.5 LSB) when operating in the Unipolar mode. Bipolar Zero Error This is the deviation of the midscale transition (0111 . . . 111 to 1000 . . . 000) from the ideal (AGND – 0.5 LSB) when operating in the Bipolar mode. It is expressed in microvolts. Bipolar Negative Full-Scale Error This is the deviation of the first code transition from the ideal (–VREF + 0.5 LSB) when operating in the Bipolar mode. Positive Full-Scale Overrange Positive full-scale overrange is the amount of overhead available to handle input voltages greater than +VREF (for example, noise peaks or excess voltages due to system gain errors in system calibration routines) without introducing errors due to overloading the analog modulator or overflowing the digital filter. Negative Full-Scale Overrange This is the amount of overhead available to handle voltages below –VREF without overloading the analog modulator or overflowing the digital filter. Note that the analog input will accept negative voltage peaks even in the Unipolar mode. Offset Calibration Range In the system calibration modes (SC2 low), the AD7703 calibrates its offset with respect to the AIN pin. The offset calibration range specification defines the range of voltages, expressed as a percentage of VREF, that the AD7703 can accept and still accurately calibrate offset. Full-Scale Calibration Range This is the range of voltages that the AD7703 can accept in the system calibration mode and still correctly calibrate full scale. Input Span In system calibration schemes, two voltages applied in sequence to the AD7703’s analog input define the analog input range. The input span specification defines the minimum and maximum input voltages from zero to full scale that the AD7703 can accept and still accurately calibrate gain. The input span is expressed as a percentage of VREF. DATA VALID t 10 HI-Z SDATA CS Figure 4. SSC Mode Data Hold Time HI-Z DB18 DB1 DB0 HI-Z SDATA DRDY CS t 12 t 11 t 13 t 14 SCLK t 16 DB19 Figure 5a. SEC Mode Timing Diagram |
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