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AD7701AR Datasheet(PDF) 6 Page - Analog Devices |
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AD7701AR Datasheet(HTML) 6 Page - Analog Devices |
6 / 16 page AD7701 REV. D –6– 1.6mA 200 µA CL 100pF TO OUTPUT PIN IOH 2.1V + IOL Figure 1. Load Circuit for Access Time and Bus Relinquish Time DATA VALID t 10 HI-Z SDATA CS Figure 3. SSC Mode Data Hold Time CAL SC1, SC2 SC1,SC2 VALID t 1 t 2 Figure 2a. Calibration Control Timing DATA VALID t15 HI-Z SDATA CS Figure 4a. SEC Mode Data Hold Time CLKIN SLEEP t3 Figure 2b. SLEEP Mode Timing HI-Z DB15 DB14 DB1 DB0 HI-Z SDATA DRDY CS t 12 t 11 t 13 t 14 SCLK t 16 Figure 4b. SEC Mode Timing Diagram TERMINOLOGY 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 LSBs. 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 LSBs). It applies to both positive and negative analog input ranges and it 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 uni- polar mode. It is expressed in microvolts. 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. It is expressed in microvolts. POSITIVE FULL-SCALE OVERRANGE Positive Full-Scale Overrange is the amount of overhead avail- able 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. It is expressed in millivolts. 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. The overhead is expressed in millivolts. HI-Z DB15 DB14 DB1 DB0 HI-Z SCLK SDATA CLKIN CS HI-Z t 7 t 6 t 5 t 9 t 4 t 8 Figure 5. SSC Mode Timing Diagram HI-Z START DB8 DB9 DB7 STOP 1 STOP 2 HI-Z HIGH BYTE LOW BYTE SDATA SCLK DRDY CS t 17 t 18 t 19 Figure 6. AC Mode Timing Diagram |
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