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SDM863B Datasheet(PDF) 11 Page - Burr-Brown (TI) |
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SDM863B Datasheet(HTML) 11 Page - Burr-Brown (TI) |
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11 / 27 page  ® SDM862/863/872/873 11 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 Figure 13). NO MISSING CODES (DIFFERENTIAL LINEARITY ERROR) A specification which guarantees no missing codes requires that every code combination appear in a monotonically- increasing sequence as the analog input is increased through- 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. The SDM is guaranteed to have no missing codes to 12-bit resolution over it’s respective specification temperature ranges. UNIPOLAR OFFSET ERROR An SDM 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 1/2LSB 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 SDM 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 SDM 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 tran- sition value versus a change in ambient temperature. FULL SCALE CALIBRATION ERROR The last output code 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 speci- fies the maximum change of the code transition value versus a change in ambient temperature. OPERATING INSTRUCTIONS OPERATING MODES The SDM can operate in one of two modes, namely serial and overlap, as shown in Figure 10. In serial mode, control of the device is such that a multiplexer channel X is first selected, time is then allowed for the instrumentation ampli- fier to settle, the sample/hold amplifier is set to HOLD mode and finally a conversion is carried out. This procedure is then repeated for channel Y. Faster throughput can be obtained using overlap mode. While a conversion is being Conversion Signal Acquisition SERIAL MODE Time Signal Acquisition Signal Acquisition Conversion Time MUX Selection (X) Instrumentation Amp Settling Sample/ Hold Acquisition A/D Conversion Data Valid MUX Selection (Y) MUX Selection (X) Instrumentation Amp Settling Sample/ Hold Acquisition MUX Selection (Y) Instrumentation Amp Settling Sample/ Hold Acquisition MUX Selection (Z) A/D Conversion on Channel (X) Data Valid A/D Conversion on Channel (Y) OVERLAP MODE FIGURE 10. Serial and Overlap Modes of Operation. |
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Descripción similar - SDM863B |
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