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AD698 Datenblatt(PDF) 6 Page - Analog Devices |
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AD698 Datenblatt(HTML) 6 Page - Analog Devices |
6 / 12 page REV. B –6– AD698 CONNECTING THE AD698 The AD698 can easily be connected for dual or single supply operation as shown in Figures 7, 8 and 13. The following gen- eral design procedures demonstrate how external component values are selected and can be used for any LVDT that meets AD698 input/output criteria. The connections for the A and B channels and the A channel comparators will depend on which transducer is used. In general follow the guidelines below. Parameters set with external passive components include: exci- tation frequency and amplitude, AD698 input signal frequency, and the scale factor (V/inch). Additionally, there are optional features; offset null adjustment, filtering, and signal integration, which can be implemented by adding external components. R1 C1 15nF C2 C3 R4 R3 13 16 15 14 24 23 22 21 20 19 18 17 12 11 10 9 8 1 2 3 4 7 6 5 AD698 –VS EXC1 EXC2 LEV1 LEV2 FREQ1 BFILT1 BFILT2 –BIN +BIN –AIN FREQ2 SIG REF OFFSET2 OFFSET1 +VS OUT FILT FEEDBACK SIG OUT –ACOMP AFILT2 AFILT1 +ACOMP +AIN C4 R2 33k Ω 1000pF SIGNAL REFERENCE RL VOUT 100nF 6.8µF –15V +15V 100nF 6.8µF Figure 7. Interconnection Diagram for Half-Bridge LVDT and Dual Supply Operation DESIGN PROCEDURE DUAL SUPPLY OPERATION Figure 7 shows the connection method for half-bridge LVDTs. Figure 8 demonstrates the connections for 3- and 4-wire LVDTs connected in the series opposed configuration. Both ex- amples use dual ±15 volt power supplies. A. Determine the Oscillator Frequency Frequency is often determined by the required BW of the sys- tem. However, in some systems the frequency is set to match the LVDT zero phase frequency as recommended by the manufacturer; in this case skip to Step 4. 1. Determine the mechanical bandwidth required for LVDT position measurement subsystem, fSUBSYSTEM. For this ex- ample, assume fSUBSYSTEM = 250 Hz. 2. Select minimum LVDT excitation frequency approximately 10 × f SUBSYSTEM. Therefore, let excitation frequency = 2.5 kHz. 3. Select a suitable LVDT that will operate with an excitation frequency of 2.5 kHz. The Schaevitz E100, for instance, will operate over a range of 50 Hz to 10 kHz and is an eligible candidate for this example. 4. Select excitation frequency determining component C1. C1 = 35 µFHz/f EXCITATION R1 C1 C2 C3 R4 R3 13 16 15 14 24 23 22 21 20 19 18 17 12 11 10 9 8 1 2 3 4 7 6 5 AD698 –VS EXC1 EXC2 LEV1 LEV2 FREQ1 BFILT1 BFILT2 –BIN +BIN –AIN FREQ2 SIG REF OFFSET2 OFFSET1 +VS OUT FILT FEEDBACK SIG OUT –ACOMP AFILT2 AFILT1 +ACOMP +AIN C4 R2 1000pF SIGNAL REFERENCE RL VOUT 100nF 6.8µF –15V +15V 100nF 6.8µF 1M AB C D PHASE LAG/LEAD NETWORK RT AB CD PHASE LEAD RS C C RS RS RT A B CD PHASE LAG C PHASE LAG = Arc Tan (Hz RC); PHASE LEAD = Arc Tan 1/(Hz RC) WHERE R = RS// (RS + RT) Figure 8. AD698 Interconnection Diagram for Series Opposed LVDT and Dual Supply Operation B. Determine the Oscillator Amplitude Amplitude is set such that the primary signal is in the 1.0 V to 3.5 V rms range and the secondary signal is in the 0.25 V to 3.5 V rms range when the LVDT is at its mechanical full-scale position. This optimizes linearity and minimizes noise suscepti- bility. Since the part is ratiometric, the exact value of the excita- tion is relatively unimportant. 5. Determine optimum LVDT excitation voltage, VEXC. For a 4-wire LVDT determine the voltage transformation ratio, VTR, of the LVDT at its mechanical full scale. VTR = LVDT sensitivity × Maximum Stroke Length from null. LVDT sensitivity is listed in the LVDT manufacturer’s cata- log and has units of volts output per volts input per inch dis- placement. The E100 has a sensitivity of 2.4 mV/V/mil. In the event that LVDT sensitivity is not given by the manufac- turer, it can be computed. See section on determining LVDT sensitivity. |
Ähnliche Teilenummer - AD698 |
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Ähnliche Beschreibung - AD698 |
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