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AD7745 Datasheet(PDF) 9 Page - Analog Devices |
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AD7745 Datasheet(HTML) 9 Page - Analog Devices |
9 / 28 page AD7745/AD7746 Rev. 0| Page 9 of 28 8 –12 –250 250 CIN LEAKAGE TO GND (nA) 2.7V 3V 6 4 2 0 –2 –4 –6 –8 –10 –200 –150 –100 –50 0 50 100 150 200 Figure 12. Capacitance Input Error vs. Leakage Current to GND, CIN(+) to EXC = 4 pF, CIN(−) to EXC = 0 pF, VDD = 2.7 V and 3 V 8 –12 –250 250 CIN LEAKAGE TO GND (nA) 6 4 2 0 –2 –4 –6 –8 –10 –200 –150 –100 –50 0 50 100 150 200 3.3V 5V Figure 13. Capacitance Input Error vs. Leakage Current to GND, CIN(+) to EXC =4 pF, CIN(−) to EXC = 0 pF, VDD=3.3 V and 5 V 10 0.0001 1 100000 PARALLEL RESISTANCE (M Ω) 1 0.1 0.01 0.001 10 100 1000 10000 Figure 14. Capacitance Input Error vs. Resistance in Parallel with Measured Capacitance 0 –10 07 SERIAL RESISTANCE (k Ω) –2 –4 –6 –8 12345 6 Figure 15. Capacitance Input Error vs. Serial Resistance, CIN(+) to EXC = 21 pF, CIN(−) to EXC = 23 pF, VDD = 5 V, the Same Configuration as in Figure 34. 0.2 –1.0 2.5 5.5 VDD (V) 0 –0.2 –0.4 –0.6 –0.8 3.0 3.5 4.0 4.5 5.0 Figure 16. Capacitance Input Power Supply Rejection (PSR), CIN(+) to EXC = 4 pF, the Same Configuration as in Figure 30 0.20 –0.20 0 128 CAPDAC CODE 0.15 0.10 0.05 0 –0.05 –0.10 –0.15 16 32 48 64 80 96 112 Figure 17. CAPDAC Differential Nonlinearity (DNL) |
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