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Zakładka z wyszukiwarką danych komponentów |
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AD598AD Arkusz danych(PDF) 8 Page - Analog Devices |
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AD598AD Arkusz danych(HTML) 8 Page - Analog Devices |
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8 / 16 page  AD598 REV. A –8– 13. Load current through RL returns to the junction of R5 and R6, and flows back to VPS. Under maximum load condi- tions, make sure the voltage drop across R5 is met as defined in Step 12. As a final check on the power supply voltages, verify that the peak values of VA and VB are at least 2.5 volts less than the voltages at +VS and –VS. 14. C5 is a bypass capacitor in the range of 0.1 µF to 1 µF. EXC 1 EXC 2 LEV 1 LEV 2 FREQ 1 FREQ 2 B1 FILT B2 FILT OFFSET 1 OFFSET 2 SIG REF SIG OUT FEEDBACK OUT FILT A1 FILT A2 FILT R1 C2 AD598 C3 R2 C4 LVDT SCHAEVITZ E100 R3 R4 0.1 µF 6.8 µF SIGNAL REFERENCE 30V + –VS R L VOUT +VS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 16 15 17 18 19 20 R5 R6 C5 C1 15nF 33k V B V B VA VA Vps Figure 12. Interconnection Diagram for Single Supply Operation Gain Phase Characteristics To use an LVDT in a closed loop mechanical servo application, it is necessary to know the dynamic characteristics of the trans- ducer and interface elements. The transducer itself is very quick to respond once the core is moved. The dynamics arise prima- rily from the interface electronics. Figures 13, 14 and 15 show the frequency response of the AD598 LVDT Signal Condi- tioner. Note that Figures 14 and 15 are basically the same; the difference is frequency range covered. Figure 14 shows a wider range of mechanical input frequencies at the expense of accu- racy. Figure 15 shows a more limited frequency range with en- hanced accuracy. The figures are transfer functions with the input to be considered as a sinusoidally varying mechanical posi- tion and the output as the voltage from the AD598; 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 figures. The response is approximately that of two real poles. However, there is appreciable excess phase at higher fre- quencies. An additional pole of filtering can be introduced with a shunt capacitor across R2, (see Figure 7); this will also in- crease 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 16 and 17 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 shown as a parameter (see Figure 7). The value of R2 used was 81 k Ω with a Schaevitz E100 LVDT. Figure 13. Gain and Phase Characteristics vs. Frequency (0 kHz–10 kHz) Figure 14. Gain and Phase Characteristics vs. Frequency (0 kHz–50 kHz) |
Podobny numer części - AD598AD |
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Podobny opis - AD598AD |
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