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AD7226KR 데이터시트(PDF) 10 Page - Analog Devices |
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AD7226KR 데이터시트(HTML) 10 Page - Analog Devices |
10 / 12 page AD7226 REV. A –10– STAIRCASE WINDOW COMPARATOR In many test systems, it is important to be able to determine whether some parameter lies within defined limits. The staircase window comparator of Figure 18a is a circuit which can be used, for example, to measure the VOH and VOL thresholds of a TTL device under test. Upper and lower limits on both VOH and VOL can be programmably set using the AD7226. Each ad- jacent pair of comparators forms a window of programmable size. If VTEST lies within a window then the output for that win- dow will be high. With a reference of +2.56 V applied to the VREF input, the minimum window size is 10 mV. Figure 18a. Logic Level Measurement Figure 18b. Window Structure The circuit can easily be adapted to allow for overlapping of windows as shown in Figure 19a. If the three outputs from this circuit are decoded then five different nonoverlapping program- mable windows can again be defined. Figure 19a. Overlapping Windows Figure 19b. Window Structure Figure 20. Varying Reference Signal VARYING REFERENCE SIGNAL In some applications, it may be desirable to have a varying sig- nal applied to the reference input of the AD7226. The AD7226 has multiplying capability within upper and lower limits of refer- ence voltage when operated with dual supplies. The upper and lower limits are those required by the AD7226 to achieve its lin- earity specification. Figure 20 shows a sine wave signal applied to the reference input of the AD7226. For input signal frequen- cies up to 50 kHz the output distortion typically remains less than 0.1%. Typical 3 dB bandwidth figure is 700 kHz. |
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