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AD2S100 датащи(PDF) 8 Page - Analog Devices |
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AD2S100 датащи(HTML) 8 Page - Analog Devices |
8 / 12 page AD2S100 REV. A –8– TIMING DIAGRAMS Busy Output The state of converter is indicated by the state of the BUSY out- put (Pin 44). The BUSY output will go HI at the negative edge of the STROBE input. This is used to synchronize digital input data and load the digital angular rotation information into the device counter. The BUSY output will remain HI for 2 µs, and go LO until the next strobe negative edge occurs. Strobe Input The width of the positive STROBE pulse should be at least 100 ns, in order to successfully start the conversion. The maxi- mum frequency of STROBE input is 366 kHz, i.e., there should be at least 2.73 µs from the negative edge of one STROBE pulse to the next rising edge. This is illustrated by the following tim- ing diagram and table. t1 t2 t3 t4 STROBE BUSY tf tr Figure 7. AD2S100 Timing Diagram Note: Digital data should be stable 25 ns before and after posi- tive strobe edge. Table II. AD2S100 Timing Table Parameter Min Typ Max Condition t1 100 ns STROBE Pulse Width t2 30 ns STROBE ↓ to BUSY ↑ t3 1.7 µs 2.5 µs BUSY Pulse Width t4 100 ns BUSY ↓ to STROBE ↑ tr 20 ns BUSY Pulse Rise Time with No Load 150 ns BUSY Pulse Rise Time with 68 pF Load tf 10 ns BUSY Pulse Fall Time with No Load 120 ns BUSY Pulse Fall Time with 68 pF Load TYPICAL CIRCUIT CONFIGURATION Figure 8 shows a typical circuit configuration for the AD2S100 in a three phase, nominal level input mode (MODE2). AD2S100 TOP VIEW 141 38 30 27 23 12 16 LSB 10µF 100nF 10µF 100nF –5V +5V GND MSB PH/OP1 PH/OP3 PH/OP2 AGND PH/IP4 PH/IP3 PH/IP2 PH/IP1 34 Figure 8. Typical Circuit Configuration APPLICATIONS Forward and ReverseTransformation The AD2S100 can perform both forward and reverse transfor- mations. The section “Theory of Operation” explains how the chip operates with the core operator e +j φ, which performs a for- ward transformation. The reverse transformation, e –j φ, is not mentioned in the above sections of the data sheet simply to avoid the confusion in the functionality and pinout. However, the reverse transformation is very useful in many different appli- cations, and the AD2S100 can be easily configured in a reverse transformation configuration. Figure 9 shows four different phase input/output connections for AD2S100 reverse transfor- mation operation. –1 3 PHASE – 3 PHASE e–jφ –1 e+jφ e+jφ e+jφ e+jφ 2 PHASE – 2 PHASE 2 PHASE – 3 PHASE 3 PHASE – 2 PHASE FORWARD TRANSFORMATION AD2S100 REVERSE TRANSFORMATION AD2S100 Cos θ Sin θ Cos( θ +φ) Cos( θ + φ + 120°) Cos( θ + φ + 240°) Cos( θ + 120°) Cos( θ + 240°) Cos θ Sin θ Cos θ Cos θ Cos( θ + 120°) Cos( θ + 240°) Cos( θ + φ) Sin( θ + φ) Cos( θ + φ) Cos( θ + φ + 120°) Cos( θ + φ + 240°) Cos( θ + φ) Sin( θ + φ) Cos θ Cos( θ + 120°) Cos( θ + 240°) Cos( θ – φ) Cos( θ – φ + 120°) Cos( θ – φ + 240°) Cos( θ – φ) Cos( θ – φ + 120°) Cos( θ – φ + 240°) Cos θ Sin θ Cos( θ – φ) Sin( θ – φ) Cos θ Sin θ Cos θ Cos( θ + 120°) Cos( θ + 240°) Cos( θ – φ) Sin( θ – φ) e–jφ e–jφ e–jφ Figure 9. Reverse Transformation Connections |
Аналогичный номер детали - AD2S100 |
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Аналогичное описание - AD2S100 |
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