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AD7226BCHIPS Arkusz danych(PDF) 11 Page - Analog Devices |
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AD7226BCHIPS Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 16 page REV. AD7226 –11– 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 14a is a circuit that 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 adjacent pair of comparators forms a window of programmable size. If VTEST lies within a window, then the output for that window will be high. With a reference of 2.56 V applied to the VREF input, the minimum window size is 10 mV. VREF VDD AGND VOUTA VOUTB VOUTC VOUTD VOH (HIGH) VOL (HIGH) VOH (LOW) VOL (LOW) VTEST FROM D.U.T. 1/4 CA339 10k 5V 10k 5V 5V 5V 10k 10k 5V 10k WINDOW 5 WINDOW 4 WINDOW 3 WINDOW 2 WINDOW 1 AD7226 Figure 14a. Logic Level Measurement VREF AGND VOUTA VOUTB VOUTC VOUTD WINDOW 5 WINDOW 4 WINDOW 3 WINDOW 2 WINDOW 1 Figure 14b. Window Structure The circuit can easily be adapted to allow for overlapping of windows as shown in Figure 15a. If the three outputs from this circuit are decoded then five different nonoverlapping program- mable windows can again be defined. VREF VDD AGND 5V 10k WINDOW 3 VOUTA VOUTB VOUTC VOUTD VTEST FROM D.U.T. 10k 5V 10k 5V WINDOW 2 WINDOW 1 AD7226 Figure 15a. Overlapping Windows VREF AGND VOUTA VOUTB VOUTC VOUTD WINDOW 3 WINDOW 2 WINDOW 1 Figure 15b. Window Structure DAC A VREF VDD DGND AGND VSS VOUTA AD7226* *DIGITAL INPUTS OMITTED FOR CLARITY +4V –4V +15V 15k 10k Figure 16. Varying Reference Signal VARYING REFERENCE SIGNAL In some applications, it may be desirable to have a varying signal applied to the reference input of the AD7226. The AD7226 has multiplying capability within upper and lower limits of reference voltage when operated with dual supplies. The upper and lower limits are those required by the AD7226 to achieve its linearity specification. Figure 16 shows a sine wave signal applied to the reference input of the AD7226. For input signal frequencies up to 50 kHz, the output distortion typically remains less than 0.1%. Typical 3 dB bandwidth figure is 700 kHz. D |
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