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AD7226TQ Arkusz danych(PDF) 10 Page - Analog Devices

Numer części AD7226TQ
Szczegółowy opis  LC2MOS Quad 8-Bit D/A Converter
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AD7226TQ Arkusz danych(HTML) 10 Page - Analog Devices

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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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