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AD2S82 数据表(PDF) 10 Page - Analog Devices |
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AD2S82 数据表(HTML) 10 Page - Analog Devices |
10 / 16 page REV. B –10– AD2S81A/AD2S82A BUSY RIPPLE CLK DATA DIR DATA BYTE SELECT DATA ENABLE INHIBIT VL VH t1 VH t2 t4 VH VL VH VH t3 t5 VL VH INHIBIT t6 VH t7 t8 t9 VL VL VL t10 VZ VH VL t11 VL VH VH VL t13 t12 PARAMETER TMIN TMAX CONDITION t1 200 600 BUSY WIDTH VH–VH t2 10 25 RIPPLE CLOCK VH TO BUSY VH t3 470 580 RIPPLE CLOCK VL TO NEXT BUSY VH t4 16 45 BUSY VH TO DATA VH t5 3 25 BUSY VH TO DATA VL t6 70 140 INHIBIT VH TO BUSY VH t7 485 625 MIN DIR VH TO BUSY VH t8 515 670 MIN DIR VH TO BUSY VH t9 – 600 INHIBIT VL TO DATA STABLE t10 40 110 ENABLE VL TO DATA VH t11 35 110 ENABLE VL TO DATA VL t12 60 140 BYTE SELECT VL TO DATA STABLE t13 60 125 BYTE SELECT VH TO DATA STABLE Figure 3. Digital Timing PHASE- SENSITIVE DEMODULATOR AC ERROR RATIO MULTIPLIER A1 sin ( – ) sin t sin sin t cos sin t DIGITAL VCO C4 C5 R5 R4 R6 VELOCITY CLOCK DIRECTION INTEGRATOR Figure 4. AD2S81A/AD2S82A Functional Diagram CIRCUIT FUNCTIONS AND DYNAMIC PERFORMANCE The AD2S81A/AD2S82A allows the user greater flexibility in choosing the dynamic characteristics of the resolver-to-digital conversion to ensure the optimum system performance. The characteristics are set by the external components shown in Figure 1, and the Component Selection section explains how to select desired maximum tracking rate and bandwidth values. The following paragraphs explain in greater detail the circuit of the AD2S81A/AD2S82A and the variations in the dynamic performance available to the user. Loop Compensation The AD2S81A and AD2S82A (connected as shown in Figure 1a and 1b) operates as a type 2 tracking servo loop where the VCO/counter combination and integrator perform the two inte- gration functions inherent in a type 2 loop. Additional compensation in the form of a pole/zero pair is re- quired to stabilize any type 2 loop to avoid the loop gain charac- teristic crossing the 0 dB axis with 180 ° of additional phase lag, as shown in Figure 6. This compensation is implemented by the integrator components (R4, C4, R5, C5). The overall response of such a system 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. The AD2S81A/AD2S82A does not have to be connected as tracking converter, parts of the circuit can be used indepen- dently. This is particularly true of the Ratio Multiplier which can be used as a control transformer (see Application Note). A block diagram of the AD2S81A/AD2S82A is given in Figure 4. |
类似零件编号 - AD2S82 |
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类似说明 - AD2S82 |
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