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HI1-574AKD-5 Datasheet(PDF) 9 Page - Intersil Corporation |
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HI1-574AKD-5 Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 18 page 9 FN3096.6 August 7, 2008 Definitions of Specifications Linearity Error Linearity error refers to the deviation of each individual code from a line drawn from “zero” through “full scale”. The point used as “zero” occurs 1/2 LSB (1.22mV for 10V span) before the first code transition (all zeros to only the LSB “on”). “Full scale” is defined as a level 11/2 LSB beyond the last code transition (to all ones). The deviation of a code from the true straight line is measured from the middle of each particular code. The HI-X74AK grade is guaranteed for maximum nonlinearity of ±1/2 LSB. For this grade, this means that an analog value which falls exactly in the center of a given code width will result in the correct digital output code. Values nearer the upper or lower transition of the code width may produce the next upper or lower digital output code. The HI-X74AJ is guaranteed to ±1 LSB max error. For this grade, an analog value which falls within a given code width will result in either the correct code for that region or either adjacent one. Note that the linearity error is not user-adjustable. Differential Linearity Error (No Missing Codes) A specification which guarantees no missing codes requires that every code combination appear in a monotonic increasing sequence as the analog input level is increased. Thus every code must have a finite width. For the HI-X74AK grade, which guarantees no missing codes to 12-bit resolution, all 4096 codes must be present over the entire operating temperature ranges. The HI-X74AJ grade guarantees no missing codes to 11-bit resolution over temperature; this means that all code combinations of the upper 11 bits must be present; in practice very few of the 12-bit codes are missing. Unipolar Offset The first transition should occur at a level 1/2 LSB above analog common. Unipolar offset is defined as the deviation of the actual transition from that point. This offset can be adjusted as discussed on the following pages. The unipolar offset temperature coefficient specifies the maximum change of the transition point over temperature, with or without external adjustment. Bipolar Offset Similarly, in the bipolar mode, the major carry transition (0111 1111 1111 to 1000 0000 0000) should occur for an analog value 1/2 LSB below analog common. The bipolar offset error and temperature coefficient specify the initial deviation and maximum change in the error over temperature. Full Scale Calibration Error The last transition (from 1111 1111 1110 to 1111 1111 1111) should occur for an analog value 11/2 LSB below the nominal full scale (9.9963V for 10.000V full scale). The full scale calibration error is the deviation of the actual level at the last transition from the ideal level. This error, which is typically 0.05 to 0.1% of full scale, can be trimmed out as shown in Figures 1 and 2. The full scale calibration error over temperature is given with and without the initial error trimmed out. The temperature coefficients for each grade indicate the maximum change in the full scale gain from the initial value using the internal 10V reference. Pin Descriptions PIN SYMBOL DESCRIPTION 1VLOGIC Logic supply pin (+5V) 2 12/8 Data Mode Select - Selects between 12-bit and 8-bit output modes. 3CS Chip Select - Chip Select high disables the device. 4AO Byte Address/Short Cycle - See Table 3 for operation. 5R/C Read/Convert - See Table 3 for operation. 6 CE Chip Enable - Chip Enable low disables the device. 7VCC Positive Supply (+12V/+15V) 8 REF OUT +10V Reference 9 AC Analog Common 10 REF IN Reference Input 11 VEE Negative Supply (-12V/-15V). 12 BIP OFF Bipolar Offset 13 10V Input 10V Input - Used for 0V to 10V and -5V to +5V input ranges. 14 20V Input 20V Input - Used for 0V to 20V and -10V to +10V input ranges. 15 DC Digital Common 16 DB0 Data Bit 0 (LSB) 17 DB1 Data Bit 1 18 DB2 Data Bit 2 19 DB3 Data Bit 3 20 DB4 Data Bit 4 21 DB5 Data Bit 5 22 DB6 Data Bit 6 23 DB7 Data Bit 7 24 DB8 Data Bit 8 25 DB9 Data Bit 9 26 DB10 Data Bit 10 27 DB11 Data Bit 11 (MSB) 28 STS Status Bit - Status high implies a conversion is in progress. HI-574A, HI-674A |
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