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AD2S82AJP Datasheet(PDF) 15 Page - Analog Devices |
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AD2S82AJP Datasheet(HTML) 15 Page - Analog Devices |
15 / 16 page AD2S81A/AD2S82A REV. B –15– For more information on resistive scaling of SIN, COS and REFERENCE converter inputs, refer to the application note “Circuit Applications of the 2S81 and 2S80 Resolver-to-Digital Converters.” APPLICATIONS Control Transformer The ratio multiplier of the AD2S82A can be used independently of the loop integrators as a control transformer. In this mode the resolver inputs θ are multiplied by a digital angle φ, any differ- ence between and φ and θ will be represented by the AC ERROR output as SIN ωt sin (θ–φ) or the DEMOD output as sin (θ–φ). To use the AD2S81A/AD2S82A in this mode refer to the “Control Transformer” application note. Dynamic Switching In applications where the user requires wide band response from the converter, for example 100 rpm to 6000 rpm, superior per- formance is achieved if the converters control characteristics are switched dynamically. This reduces velocity offset levels at low tracking rates. For more information on the technique refer to “Dynamic Resolution Switching Using the Variable Resolution Monolithic Resolver-to-Digital Converters.” OTHER PRODUCTS The AD2S80A is a monolithic resolver-to-digital converter offering 10–16 bits of resolution and user selectable dynamics. The AD2S80A is also available in 40-lead ceramic DIP, 44-lead LCC and is qualified to MIL-STD 883B Rev C. The AD2S46 is a highly integrated hybrid resolver/synchro to digital converter packaged in a 28-lead ceramic DIP. The part offers the user 1.3 arc minutes of accuracy over the full military temperature range. The AD2S34 is a dual channel 14-bit hybrid resolver-to-digital converter packaged in a 1 in 2 32-lead flatpack. The 1740/41/42 are hybrid resolver/synchro to digital converters which incorporate pico-transformer isolated input signal conditioning. TYPICAL CIRCUIT CONFIGURATION Figure 11 shows a typical circuit configuration for the AD2S81A/ AD2S82A in a 12-bit resolution mode. Values of the external components have been chosen for a reference frequency of 5 kHz and a maximum tracking rate of 260 rps with a bandwidth of 520 Hz. Placing the values for R4, R6, C4 and C5 in the equa- tion for KA gives a value of 2.7 × 106. The resistors are 0.125 W, 5% tolerance preferred values. The capacitors are 100 V ceramic, 10% tolerance components. For signal and reference voltages greater than 2 V rms a simple voltage divider circuit of resistors can be used to generate the correct signal level at the converter. Care should be taken to ensure that the ratios of the resistors between the sine signal line and ground and the cosine signal line and ground are the same. Any difference will result in an additional position error. TIME – ms 360 0 024 4 812 16 20 315 180 135 90 45 270 225 Figure 12. Large Step Response Curves for Typical Circuit Shown in Figure 11 RIPPLE CLK DIRECTION BUSY DATA LOAD BYTE SELECT –12V MSB LSB 0V VELOCITY O/P +5V 15k 22nF PIN 1 IDENTIFIER 18 19 20 21 22 23 24 25 26 27 28 65 4321 44 43 42 41 40 7 8 9 10 11 12 13 14 15 16 17 39 38 37 36 35 34 33 32 31 30 29 AD2S82A TOP VIEW (Not to scale) COS HIGH REF LOW COS LOW SIN LOW COMPLEMENT SC2 15k 22nF 100k 100nF 100nF +12V SIN HIGH REFERENCE INPUT 68 470pF 39k 110k 180k 1.5nF 6.8nF 100nF 4.7M 1M INHIBIT ENABLE DATA OUTPUT RESOLVER SIGNAL DATA OUTPUT Figure 11. Typical Circuit Configuration |
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