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AD2S90APZ bảng dữ liệu(PDF) 9 Page - Analog Devices |
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9 / 12 page AD2S90 REV. D –9– REMOTE MULTIPLE SENSOR INTERFACING The DATA output of the AD2S90 is held in a high impedance state until CS is taken LO. This allows a user to operate the AD2S90 in an application with more than one converter con- nected on the same line. Figure 16 shows four resolvers inter- faced to four AD2S90s. Excitation for the resolvers 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) CS1 CS2 CS3 CS4 A0 A1 SCLK DATA VDD VSS 0V AD2S90 1 RES1 AD2S90 2 RES2 AD2S90 3 RES3 AD2S90 4 RES4 4 4 4 4 2 2 OSC BUFFER Figure 16. Remote Sensor Interfacing CIRCUIT DYNAMICS/ERROR SOURCES Transfer Function The AD2S90 operates as a Type 2 tracking servo loop. An integrator and VCO/counter perform the two integrations inher- ent in a Type 2 loop. The overall system response of the AD2S90 is that of a unity gain second order low-pass filter, with the angle of the resolver as the input and the digital position data as the output. Figure 17 illustrates the AD2S90 system diagram. A2 (S) A1 (S) IN VEL OUT OUT Figure 17. AD2S90 Transfer Function The open-loop transfer function is given by: θ OUT θ IN = K1K2 s 2 (1 + st 1 ) 1 + st 2 (5) where: As K s st st 1 11 2 1 1 () = + + tms ts 1 2 10 90 = = . µ (6) As K s K V LSB K LSB V 2 2 1 2 4 875 614 400 () ./( sec) , /( sec) = =× =× (7) The AD2S90 acceleration constant is given by: KK K a =× ≅ × − 12 62 30 10 . sec (8) The AD2S90’s design has been optimized with a critically damped response. The closed-loop transfer function is given by: θ θ OUT IN st st s KK st KK = + ++ + 1 1 1 1 2 12 3 2 12 (9) The normalized gain and phase diagrams are given in Figures 18 and 19. 5 –45 –30 –40 10 –35 1 –15 –25 –20 –10 –5 0 1k 100 FREQUENCY – Hz 10k Figure 18. AD2S90 Gain Plot FREQUENCY – Hz 0 –180 10k –140 –160 10 1 –120 –100 –80 –60 –40 –20 1k 100 Figure 19. AD2S90 Phase Plot |
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