AD7398 查看數據表（PDF） - Analog Devices
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AD7398 Datasheet PDF : 24 Pages
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AD7398/AD7399
APPLICATIONS INFORMATION
STAIRCASE WINDOWS COMPARATOR
Many applications need to determine whether voltage levels are
within predetermined limits. Some requirements are for
nonoverlapping windows and others for overlapping windows.
Both circuit configurations are shown in Figure 33 and
Figure 34, respectively.
VREF
VDD
VREFA
VOUTA
VTEST
AD8564
+
–
+
–
+
–
V+
10kΩ
WINDOW 1
V+
10kΩ
WINDOW 2
AD7398/
+
AD7399
–
VREFB
VOUTB
AD8564
+
–
V+
10kΩ
WINDOW 3
VREFC
VOUTC
+
–
V+
10kΩ
+
WINDOW 4
–
+
–
VREFD
VOUTD
GND
1/2
AD8564
+
–
+
–
V+
10kΩ
WINDOW 5
Figure 33. Nonoverlapping Windows Comparator
VREF
VOUTA
VOUTB
VOUTC
VOUTD
GND
WINDOW 1
WINDOW 2
WINDOW 3
WINDOW 4
WINDOW 5
Figure 34. Nonoverlapping Windows Range
VREF
VDD
VREFA
VOUTA
VREFB
VOUTB
AD7398/
AD7399
VREFC
VOUTC
VTEST
AD8564
+
–
+
–
+
–
+
–
VREFD
VOUTD
GND
1/2
AD8564
+
–
+
–
V+
10kΩ
WINDOW 1
V+
10kΩ
WINDOW 2
V+
10kΩ
WINDOW 3
Figure 35. Overlapping Windows Comparator
VREF
VOUTB
VOUTA
VOUTD
VOUTC
GND
WINDOW 1
WINDOW 2
WINDOW 3
Figure 36. Overlapping Windows Range
The nonoverlapping circuit employs one AD7398/AD7399 and
ten comparators to achieve five voltage windows. These windows
range between VREF and analog ground as shown in Figure 34.
Similarly, the overlapping circuit employs six comparators to
achieve three overlapping windows (see Figure 36).
Rev. C | Page 18 of 24
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