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AD698APZ Datasheet(PDF) 9 Page - Analog Devices |
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AD698APZ Datasheet(HTML) 9 Page - Analog Devices |
9 / 12 page AD698 REV. B –9– FREQUENCY – Hz 0 100k 100 1k 10k 10 0 –30 –60 –70 0 –10 –20 –50 –40 –360 –60 –240 –300 –420 –180 –120 0.1µF 0.033µF 0.01µF R2 = 81k Ω fEXC = 10kHz 0.1µF 0.033µF 0.01µF R2 = 81k Ω fEXC = 10kHz Figure 15. Gain and Phase Characteristics vs. Frequency (0 kHz–50 kHz) FREQUENCY – Hz 0 100 1k 10k 10 0 –30 –60 –70 –10 –20 –50 –40 0 –360 –60 –240 –300 –180 –120 0.1µF 0.033µF 0.01µF R2 = 81k Ω fEXC = 10kHz 0.1µF 0.033µF 0.01µF R2 = 81k Ω fEXC = 10kHz Figure 16. Gain and Phase Characteristics vs. Frequency (0 kHz–10 kHz) Figure 16 shows a more limited frequency range with enhanced accuracy. The figures are transfer functions with the input to be considered as a sinusoidally varying mechanical position and the output as the voltage from the AD698; the units of the transfer function are volts per inch. The value of C2, C3, and C4, from Figure 7, are all equal and designated as a parameter in the fig- ures. The response is approximately that of two real poles. However, there is appreciable excess phase at higher frequen- cies. An additional pole of filtering can be introduced with a shunt capacitor across R2, Figure 7; this will also increase phase lag. When selecting values of C2, C3 and C4 to set the bandwidth of the system, a trade-off is involved. There is ripple on the “dc” position output voltage, and the magnitude is determined by the filter capacitors. Generally, smaller capacitors will give higher system bandwidth and larger ripple. Figures 17 and 18 show the magnitude of ripple as a function of C2, C3 and C4, again all equal in value. Note also a shunt capacitor across R2, Figure 7, is shown as a parameter. The value of R2 used was 81 k Ω with a Schaevitz E100 LVDT. C2, C3, C4; C2 = C3 = C4 – µF 1k 100 0.1 0.01 0.1 10 1 10 1 2.5kHz, C SHUNT 1nF 2.5kHz, C SHUNT 10nF Figure 17. Output Voltage Ripple vs. Filter Capacitance C2, C3, C4; C2 = C3 = C4 – µF 1k 100 0.1 0.001 0.01 10 0.1 10 1 10kHz, C SHUNT 1nF 10kHz, C SHUNT 10nF 1 Figure 18. Output Voltage Ripple vs. Filter Capacitance |
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