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AD2S93AP Scheda tecnica(PDF) 9 Page - Analog Devices |
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AD2S93AP Scheda tecnica(HTML) 9 Page - Analog Devices |
9 / 12 page –9– REV. A AD2S93 Two-Wire LVDT Connection This method should be used in cases where the sum of the LVDT secondary output voltages (A + B) is not constant with LVDT displacement over the desired stroke length. This method of connection, shown in Figure 7, still maintains the ratiometric operation and the insensitivity to variations in reference ampli- tude and frequency. However, the phase shift between VREF and V1 should be minimized to maintain accuracy (see Section “PHASE SHIFT AND QUADRATURE EFFECTS”). Sug- gested phase compensation circuits are shown in Figure 7. PHASE SHIFT AND QUADRATURE EFFECTS Reference to signal phase shift can be high in LVDTs, some- times in the order of 70 degrees. If the converter is connected as in Figures 5 and 6, any effects due to this phase shift are minimized. This connection method, therefore, provides out- standing benefits. The additional gain error caused by reference to signal phase shifts is given by: (1 – cos θ) × 100% of FSR where θ = phase shift between V REF and DIFF. When the phase shift between VREF and V1 is zero, additional quadrature on the signal will have no effect on the converter. This is another benefit of the conversion method. For example, when a REF lags (A–B) by approximately 10 °, the gain error is approximately 1%. When (A–B) lags REF by approximately 10 °, the gain error is approximately 2%. REMOTE MULTIPLE SENSOR INTERFACING The DATA output of the AD2S93 is held in a high impedance state until CS is taken LO. This allows a user to operate the AD2S93 in an application with more than one converter con- nected on the same line. Figure 8 shows four LVDTs interfaced to four AD2S93s. Excitation for the LVDT is provided locally by an oscillator. SCLK, DATA and two address lines are fed down low loss cables suitable for communication links. The two address lines are decoded locally into CS for the individual converters. Data is received and transmitted using transmitters and receivers. 2-4 DECODING (74HC139) LVDT LVDT LVDT LVDT AD2S93 1 AD2S93 2 AD2S93 3 AD2S93 4 OSC BUFFER 4 4 4 4 2 2 0V VSS A0 A1 CS4 VDD CS3 CS2 CS1 DATA SCLK Figure 8. Remote Sensor Interface NC = NO CONNECT OVR NULL DEMODOUT DIR 4 2 3 25 24 21 20 19 23 22 1 5 69 10 7 8 TOP VIEW (Not to Scale) AD2S93 +5V 0V –5V R4 R3 PHASE SHIFT CCT OSC PISTON V DD PHASE LAG = ARCTAN 2 π fRC 4 2 3 25 24 21 20 19 23 22 1 5 69 10 7 8 TOP VIEW (Not to Scale) AD2S93 12k Ω PHASE SHIFT CCT PHASE LEAD = ARCTAN 2 π fRC 1 V DD V SS DGND AGND LOS GAIN DIFF 11 NC 26 27 28 A B 12 15 18 17 16 14 13 REF C R R C C3 R5 C4 R6 R2 C2 C1 R7 Figure 7. Two-Wire LVDT Connection |
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