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AD532 Datenblatt(PDF) 4 Page - Analog Devices |
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AD532 Datenblatt(HTML) 4 Page - Analog Devices |
4 / 7 page AD532 –4– REV. B AD532 PERFORMANCE CHARACTERISTICS Multiplication accuracy is defined in terms of total error at +25 °C with the rated power supply. The value specified is in percent of full scale and includes XIN and YIN nonlinearities, feedback and scale factor error. To this must be added such application-dependent error terms as power supply rejection, common-mode rejection and temperature coefficients (although worst case error over temperature is specified for the AD532S). Total expected error is the rms sum of the individual compo- nents since they are uncorrelated. Accuracy in the divide mode is only a little more complex. To achieve division, the multiplier cell must be connected in the feedback of the output op amp as shown in Figure 13. In this configuration, the multiplier cell varies the closed loop gain of the op amp in an inverse relationship to the denominator volt- age. Thus, as the denominator is reduced, output offset, band- width and other multiplier cell errors are adversely affected. The divide error and drift are then m × 10 V/X1 – X2) where m represents multiplier full-scale error and drift, and (X1–X2) is the absolute value of the denominator. NONLINEARITY Nonlinearity is easily measured in percent harmonic distortion. The curves of Figures 3 and 4 characterize output distortion as a function of input signal level and frequency respectively, with one input held at plus or minus 10 V dc. In Figure 4 the sine wave amplitude is 20 V (p-p). Figure 3. Percent Distortion vs. Input Signal Figure 4. Percent Distortion vs. Frequency AC FEEDTHROUGH AC feedthrough is a measure of the multiplier’s zero suppres- sion. With one input at zero, the multiplier output should be zero regardless of the signal applied to the other input. Feed- through as a function of frequency for the AD532 is shown in Figure 5. It is measured for the condition VX = 0, VY = 20 V (p-p) and VY = 0, VX = 20 V (p-p) over the given frequency range. It consists primarily of the second harmonic and is mea- sured in millivolts peak-to-peak. Figure 5. Feedthrough vs. Frequency COMMON-MODE REJECTION The AD532 features differential X and Y inputs to enhance its flexibility as a computational multiplier/divider. Common-mode rejection for both inputs as a function of frequency is shown in Figure 6. It is measured with X1 = X2 = 20 V (p-p), (Y1 – Y2) = +10 V dc and Y1 = Y2 = 20 V (p-p), (X1 – X2) = +10 V dc. Figure 6. CMRR vs. Frequency Figure 7. Frequency Response, Multiplying |
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