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AD538AD датащи(PDF) 3 Page - Analog Devices |
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AD538AD датащи(HTML) 3 Page - Analog Devices |
3 / 11 page AD538 –3– REV. C RE-EXAMINATION OF MULTIPLIER/DIVIDER ACCURACY Traditionally, the “accuracy” (actually the errors) of analog multipliers and dividers have been specified in terms of percent of full scale. Thus specified, a 1% multiplier error with a 10 V full-scale output would mean a worst case error of +100 mV at “any” level within its designated output range. While this type of error specification is easy to test evaluate, and interpret, it can leave the user guessing as to how useful the multiplier actually is at low output levels, those approaching the specified error limit (in this case) 100 mV. The AD538’s error sources do not follow the percent of full- scale approach to specification, thus it more optimally fits the needs of the very wide dynamic range applications for which it is best suited. Rather than as a percent of full scale, the AD538’s error as a multiplier or divider for a 100:1 (100 mV to 10 V) input range is specified as the sum of two error components: a percent of reading (ideal output) term plus a fixed output offset. Following this format the AD538AD, operating as a multiplier or divider with inputs down to 100 mV, has a maximum error of ±1% of reading ±500 µV. Some sample total error calculations for both grades over the 100:1 input range are illustrated in the chart below. This error specification format is a familiar one to designers and users of digital voltmeters where error is specified as a percent of reading ± a certain number of digits on the meter readout. For operation as a multiplier or divider over a wider dynamic range (>100:1), the AD538 has a more detailed error specifica- tion that is the sum of three components: a percent of reading term, an output offset term and an input offset term for the VY/VX log ratio section. A sample application of this specifica- tion, taken from Table I, for the AD538AD with VY = 1 V, VZ = 100 mV and VX = 10 mV would yield a maximum error of ±2.0% of reading ±500 µV ±(1 V + 100 mV)/10 mV × 250 µV or ±2.0% of reading ±500 µV ± 27.5 mV. This example illus- trates that with very low level inputs the AD538’s incremental gain (VY + VZ)/VX has increased to make the input offset contri- bution to error substantial. Table I. Sample Error Calculation Chart (Worst Case) VY VZ VX Ideal Total Offset % of Reading Total Error Total Error Summation Input Input Input Output Error Term Error Term Summation as a % of the Ideal (in V) (in V) (in V) (in V) (in mV) (in mV) (in mV) Output 100:1 10 10 10 10 0.5 (AD) 100 (AD) 100.5 (AD) 1.0 (AD) INPUT 0.25 (BD) 50 (BD) 50.25 (BD) 0.5 (BD) RANGE Total Error = 10 0.1 0.1 10 0.5 (AD) 100 (AD) 100.5 (AD) 1.0 (AD) ±% rdg 0.25 (BD) 50 (BD) 50.25 (BD) 0.5 (BD) ±Output V OS 1 1 1 1 0.5 (AD) 10 (AD) 10.5 (AD) 1.05 (AD) 0.25 (BD) 5 (BD) 5.25 (BD) 0.5 (BD) 0.1 0.1 0.1 0.1 0.5 (AD) 1 (AD) 1.5 (AD) 1.5 (AD) 0.25 (BD) 0.5 (BD) 0.75 (BD) 0.75 (BD) WIDE 1 0.10 0.01 10 28 (AD) 200 (AD) 228 (AD) 2.28 (AD) DYNAMIC 16.75 (BD) 100 (BD) 116.75 (BD) 1.17 (BD) RANGE Total Error = 10 0.05 2 0.25 1.76 (AD) 5 (AD) 6.76 (AD) 2.7 (AD) ±% rdg 1 (BD) 2.5 (BD) 3.5 (BD) 1.4 (BD) ±Output V OS ±Input V OS × 5 0.01 0.01 5 125.75 (AD) 100 (AD) 225.75 (AD) 4.52 (AD) (VY + VZ)/VX 75.4 (BD) 50 (BD) 125.4 (BD) 2.51 (BD) 10 0.01 0.1 1 25.53 (AD) 20 (AD) 45.53 (AD) 4.55 (AD) 15.27 (BD) 10 (BD) 25.27 (BD) 2.53 (BD) |
Аналогичный номер детали - AD538AD |
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Аналогичное описание - AD538AD |
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