AD688SQ AD [Analog Devices], AD688SQ Datasheet
AD688SQ
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AD688SQ Summary of contents
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... AD688 and calibration software. The AD688 is available in three versions. The AD688AQ and BQ grades are packaged in 16-pin cerdip (0.3") packages and are specified for operation from – +85 C. The AD688SQ grade is specified for operation from – +125 C. *Covered by Patent Number 4,644,253. ...
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AD688–SPECIFICATIONS OUTPUT VOLTAGE ERROR +10 V, –10 V Outputs 10 V TRACKING ERROR OUTPUT VOLTAGE DRIFT +10 V, –10 V Outputs +70 C (A, B) – +85 C (A, B) – +125 C ...
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... Part Number AD688AQ AD688BQ AD688SQ NOTES 1 For details on grade and package offerings screened in accordance with MIL-STD-883, refer to the Analog Devices Military Products Databook or current AD688/883B data sheet Cerdip. *Temperature coefficient specified from 0 to +70 C. THEORY OF OPERATION The AD688 consists of a buried Zener diode reference, amplifi- ers and associated thin-film resistors as shown in the block diagram of Figure 1 ...
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AD688 APPLYING THE AD688 The AD688 can be configured to provide 10 V reference out- puts as shown in Figure 2a. The architecture of the AD688 pro- vides ground sense and uncommitted output buffer amplifiers which offer the user a ...
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... Figure 7 shows the typical output voltage drift for the AD688SQ and illustrates the test methodology. The box in Fig- ure 7 is bounded on the sides by the operating temperature extremes and on top and bottom by the maximum and minimum +10 V output error voltages measured over the operating temperature range ...
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AD688 Duplication of these results requires a combination of high accuracy and stable temperature control in a test system. Evaluation of the AD688 will produce curves similar to those in Figure 7, but output readings may vary depending on the ...
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Figure 10b. Large-Scale Transient Response Figure 10c. Fine-Scale Settling for Transient Load Figure 11 displays the output amplifier characteristic driving a 5 mA-to-10 mA load, a common situation found when the reference is shared among multiple converters or is used ...
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AD688 Attempts to drive a large capacitive load (in excess of 1,000 pF) may result in ringing or oscillation, as shown in the step re- sponse photo (Figure 14a). This is due to the additional pole formed by the load ...