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ADC574 Arkusz danych(PDF) 5 Page - Burr-Brown (TI) |
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ADC574 Arkusz danych(HTML) 5 Page - Burr-Brown (TI) |
5 / 10 page 5 ® ADC574A DISCUSSION OF SPECIFICATIONS LINEARITY ERROR Linearity error is defined as the deviation of actual code transition values from the ideal transition values. Ideal transition values lie on a line drawn through zero (or minus full scale for bipolar operation) and plus full scale. The zero value is located at an analog input value 1/2LSB before the first code transition (000H to 001H). The full-scale value is located at an analog value 3/2LSB beyond the last code transition (FFEH to FFFH) (see Figure 1). FIGURE 1. ADC574A Transfer Characteristics Terminology. out the range. Thus, every input code width (quantum) must have a finite width. If an input quantum has a value of zero (a differential linearity error of –1LSB), a missing code will occur. ADC574AKP, KN, KH and TH grades are guaranteed to have no missing codes to 12-bit resolution over their re- spective specification temperature ranges. UNIPOLAR OFFSET ERROR An ADC574A connected for unipolar operation has an analog input range of 0V to plus full scale. The first output code transition should occur at an analog input value 1/2 LSB above 0V. Unipolar offset error is defined as the deviation of the actual transition value from the ideal value. The unipolar offset temperature coefficient specifies the change of this transition value versus a change in ambient temperature. BIPOLAR OFFSET ERROR A/D converter specifications have historically defined bipo- lar offset as the first transition value above the minus full- scale value. The ADC574A specification, however, follows the terminology defined for the 574 converter several years ago. Thus, bipolar offset is located near the midscale value of 0V (bipolar zero) at the output code transition 7FFH to 800H. Bipolar offset error for the ADC574A is defined as the deviation of the actual transition value from the ideal transition value located 1/2LSB below 0V. The bipolar offset temperature coefficient specifies the maximum change of the code transition value versus a change in ambient temperature. FULL SCALE CALIBRATION ERROR The last output transition (FFEH to FFFH) occurs for an analog input value 3/2LSB below the nominal full-scale value. The full-scale calibration error is the deviation of the actual analog value at the last transition point from the ideal value. The full-scale calibration temperature coefficient specifies the maximum change of the code transition value versus a change in ambient temperature. POWER SUPPLY SENSITIVITY Electrical specifications for the ADC574A assume the application of the rated power supply voltages of +5V and ±12V or ±15V. The major effect of power supply voltage BINARY (BIN) OUTPUT INPUT VOLTAGE RANGE AND LSB VALUES Analog Input Voltage Range Defined as: ±10V ±5V 0 to +10V 0 to +20V One Least Significant Bit (LSB) FSR 20V 10V 10V 20V 2n 2n 2n 2n 2n n = 8 78.13mV 39.06mV 39.06mV 78.13mV n =12 4.88mV 2.44mV 2.44mV 4.88mV Output Transition Values FFEH to FFFH +Full-Scale Calibration +10V – 3/2LSB +5 – 3/2LSB +10V – 3/2LSB +10V – 3/2LSB 7FFH to 800H Midscale Calibration (Bipolar Offset) 0 – 1/2LSB 0 – 1/2LSB +5V – 1/2LSB ±10V – 1/2LSB Full-Scale Calibration Error Rotates The Line Offset Error Shifts The Line (Bipolar Offset Transaction) Midscale (Bipolar Zero) FFF H FFE H FFD H 802 H 801 H 800 H 7FF H 7FE H 001 H 000 H 002 H 1/2LSB Zero (–Full Scale) Zero (–Full-Scale Calibration Transition) 1/2LSB 3/2LSB +Full-Scale Calibration Transition +Full Scale Analog Input TABLE I. Input Voltages, Transition Values, and LSB Values. Thus, for a converter connected for biopolar operation and with a full-scale range (or span) of 20V ( ±10V), the zero value of –10V is 2.44mV below the first code transition (000H to 001H at –9.99756V) and the plus full-scale value of +10V is 7.32mV above the last code transition (FFEH to FFFH at +9.99268) (see Table I). NO MISSING CODES (DIFFERENTIAL LINEARITY ERROR) A specification which guarantees no missing codes requires that every code combination to appear in a monotonically- increasing sequence as the analog input is increased through- |
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