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AD2S83IP bảng dữ liệu(PDF) 7 Page - Analog Devices |
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7 / 19 page AD2S83 –7– REV. D CONVERTER OPERATION When connected in a circuit such as shown in Figure 10, the AD2S83 operates as a tracking resolver-to-digital converter. The output will automatically follow the input for speeds up to the selected maximum tracking rate. No convert command is necessary as the conversion is automatically initiated by each LSB increment, or decrement, of the input. Each LSB change of the converter initiates a BUSY pulse. The AD2S83 is remarkably tolerant of input amplitude and frequency variation because the conversion depends only on the ratio of the input signals. Consequently there is no need for accurate, stable oscillator to produce the reference signal. The inclusion of the phase sensitive detector in the conversion loop ensures high immunity to signals that are not phase or frequency coherent or are in quadrature with the reference signal. SIGNAL CONDITIONING The amplitude of the SINE and COSINE signal inputs should be maintained within 10% of the nominal values if full perfor- mance is required from the velocity signal. The digital position output is relatively insensitive to amplitude variation. Increasing the input signal levels by more than 10% will result in a loss in accuracy due to internal overload. Reduc- ing levels will result in a steady decline in accuracy. With the signal levels at 50% of the correct value, the angular error will increase to an amount equivalent to 1.3 LSB. At this level the repeatability will also degrade to 2 LSB and the dynamic re- sponse will also change, since the dynamic characteristics are proportional to the signal level. The AD2S83 will not be damaged if the signal inputs are ap- plied to the converter without the power supplies and/or the reference. REFERENCE INPUT The amplitude of the reference signal applied to the converter’s input is not critical, but care should be taken to ensure it is kept within the recommended operating limits. The AD2S83 will not be damaged if the reference is supplied to the converter without the power supplies and/or the signal inputs. HARMONIC DISTORTION The amount of harmonic distortion allowable on the signal and reference lines is 10%. Square waveforms can be used but the input levels should be adjusted so that the average value is 1.9 V rms. (For example, a square wave should be 1.9 V peak.) Triangular and sawtooth waveforms should have a amplitude of 2 V rms. Note: The figure specified of 10% harmonic distortion is for calibration convenience only. POSITION OUTPUT The resolver shaft position is represented at the converter out- put by a natural binary parallel digital word. As the digital posi- tion output of the converter passes through the major carries, i.e., all “1s” to all “0s” or the inverse, a RIPPLE CLOCK (RC) logic output is initiated indicating that a revolution or a pitch of the input has been completed. The direction of input rotation is indicated by the DIRECTION (DIR) logic output. This direction data is always valid in ad- vance of a RIPPLE CLOCK pulse and, as it is internally latched, only changing state (1 LSB min change in input) with a corresponding change in direction. Both the RIPPLE CLOCK pulse and the DIRECTION data are unaffected by the application of the INHIBIT. The static positional accuracy quoted is the worst case error that can occur over the full operating temperature excluding the effects of offset signals at the INTEGRATOR INPUT (which can be trimmed out—see Figure 1), and with the following conditions: input signal amplitudes are within 10% of the nominal; phase shift between signal and reference is less than 10 degrees. These operating conditions are selected primarily to establish a repeatable acceptance test procedure which can be traced to national standards. In practice, the AD2S83 can be used well outside these operating conditions providing the above points are observed. VELOCITY SIGNAL The tracking converter technique generates an internal signal at the output of the integrator (INTEGRATOR OUTPUT) that is proportional to the rate of change of the input angle. This is a dc analog output referred to as the VELOCITY signal. It is recommended that the velocity output be buffered. The sense is positive for an increasing angular input and nega- tive for decreasing angular input. The full-scale velocity output is ±8 V dc. The output velocity scaling and tracking rate are a function of the resolution of the converter; this is summarized below. Max Tracking Nominal Scaling Res Rate (rps) (rps/V dc) 10 1040 130 12 260 32.5 14 65 8.125 16 16.25 2.03 (Velocity O/P = ±8 V dc nominal) The output velocity can be suitably scaled and used to replace a conventional DC tachogenerator. For more detailed information see the AD2S83 as a Silicon Tachogenerator section. DC ERROR SIGNAL The signal at the output of the phase sensitive detector (DEMODULATOR OUTPUT) is the signal to be nulled by the tracking loop and is, therefore, proportional to the error between the input angle and the output digital angle. As the converter is a Type 2 servo loop, the demodulator output signal will increase if the output fails to track the input for any reason. This is an indication that the input has exceeded the maximum tracking rate of the converter or, due to some internal or exter- nal malfunction, the converter is unable to reach a null. By con- necting two external comparators, this voltage can be used as a “built-in-test.” |
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