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AD53508JP Datasheet(PDF) 7 Page - Analog Devices |
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AD53508JP Datasheet(HTML) 7 Page - Analog Devices |
7 / 8 page AD53508 –7– REV. 0 IN CURRENT FORCE WITH VOLTAGE MEASURE OR VERIFY CURRENT FORCE The linearity tests for forcing current at the FORCE pin: 1. The FORCE pin is loaded with a voltage source. 2. The two ranges of CURRENT FORCE ranges (2 mA and 200 µA) correspond to F1 and F2. The endpoints of the linearity curve are determined by full scale (or LOW), and the full scale (or HIGH) readings at the same FORCE pin voltage. 3. Using these endpoints, gain nonlinearity is computed and tested at the 1/4 scale, 1/2 scale, and 3/4 scale points. 4. Computations for F1 are: F1 × 0.25 = LOW + 1 × (HIGH – LOW)/4 F1 × 0.50 = LOW + 2 × (HIGH – LOW)/4 F1 × 0.75 = LOW + 3 × (HIGH – LOW)/4 Where LOW = –Full Scale and HIGH = +Full Scale. The linearity test for measuring voltage is as follows (at the MEAS_OUT pin): 1. The endpoints of the linearity curve are determined by the –full scale (or LOW), and the +full scale (or HIGH) readings. 2. Using these endpoints, gain nonlinearity is computed and tested at the 1/4 scale, 1/2 scale, and 3/4 scale points. 3. Computations for M1 are: M1 × 0.25 = LOW + 1 × (HIGH – LOW)/4 M1 × 0.50 = LOW + 2 × (HIGH – LOW)/4 M1 × 0.75 = LOW + 3 × (HIGH – LOW)/4 Where LOW = –Full Scale, and HIGH = +Full Scale. CURRENT FORCE WITH VOLTAGE MEASURE (2 mA RANGE) 1. DAC1 = 5 V. 2. FORCE pin loaded with 9 V source. 3. Measure current at FORCE. 4. Measure voltage at MEAS_OUT. 5. VCC = 15 V. 6. Measure current at FORCE and compare to 3. 7. Measure voltage at MEAS_OUT and compare to 4. 8. VCC = 15 V. 9. DAC1 = 0 V. 10. FORCE pin loaded with –4 V source. 11. Measure current at FORCE. 12. Measure voltage at MEAS_OUT. 13. VEE = –9.5 V. 14. Measure current at FORCE and compare to 11. 15. Measure voltage at MEAS_OUT and compare to 12. 16. VEE = –10 V. VOLTAGE FORCE WITH CURRENT MEASURE (2 mA RANGE) 1. DAC1 = 9 V. 2. FORCE pin loaded with 2 mA current source. 3. Measure voltage at FORCE. 4. Measure current at MEAS_OUT. 5. VCC = 14.25 V. 6. Measure voltage at FORCE and compare to 3: Limit = ±237 µV. 7. Measure current at MEAS_OUT and compare to 4: Limit = ±237 µV. 8. VCC = 15 V. 9. DAC1 = –4 V. 10. FORCE pin loaded with 2 mA current sink. 11. Measure voltage at FORCE. 12. Measure current at MEAS_OUT. 13. VEE = –9.5 V. 14. Measure voltage at FORCE and compare to 11: Limit = ±474 µV. 15. Measure current at MEAS_OUT and compare to 12. 16. VEE = –10 V. S11 S12 S13 S14 S15 S16 INT/IM R1 R2 INTEGRATE S10 UNITY DIFF VF S4 IF S5 C1 1k 2mA 10k 200 A EXT RC SENSE S8 S9 S2 S3 VM IM ENABLE S1 CON 2.5V S6 S7 FORCING VOLTAGE DAC1 DAC2 DSR MEAS OUT 40pF S17 GUARD FORCE SENSE R R 1.25R 1.25R MAIN GUARD S18 AD53508 OUTPUT Figure 3. Guarded Current Force/Voltage Measure, IRANGE 1: I ≤ 2 mA |
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