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參數(shù)資料
| 型號(hào)： | AD7398 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Quad, Serial-Input 12-Bit/10-Bit DACs |
| 中文描述： | 四，串行輸入12-Bit/10-Bit數(shù)模轉(zhuǎn)換器 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 273K |
| 代理商： | AD7398 |
REV. 0
AD7398/AD7399
–15–
GND
V
OUT
A
V
OUT
B
V
OUT
C
V
OUT
D
V
REF
WINDOW 1
WINDOW 2
WINDOW 3
Figure 15. Overlapping Windows Range
The nonoverlapping circuit employs one AD7398/AD7399 and
ten comparators to achieve five voltage windows. These windows
range between V
REF
and analog ground as shown in Figure 13.
Similarly, the overlapping circuit employs six comparators to
achieve three overlapping windows, Figure 15.
PROGRAMMABLE DAC REFERENCE VOLTAGE
With AD7398/AD7399
’
s flexibility, one of the internal DACs
can be used to control a common programmable V
REFX
for the
rest of the DACs.
The circuit configuration is shown in Figure 16. The relation-
ship of V
REFX
to V
REF
is dependent upon the digital code and
the ratio of R1 and R2, and is given by:
V
V
R
R
V
D
N
2
R
R
REFX
REF
REFX
=
×
+
×
×
1
2
1
2
1
–
(5)
V
V
R
R
R
R
D
N
2
REFX
REF
=
×
+
+
×
1
2
1
1
2
1
(6)
Where
D
= Decimal Equivalent of Input Code
N
= Number of Bits
V
REF
= Applied External Reference
V
REFX
= Reference Voltage for DAC A to D
Table V. V
REFX
vs. R1 and R2
R1, R2
Digital Code
V
REFX
2 V
REF
1.3 V
REF
V
REF
4 V
REF
1.6 V
REF
V
REF
R1
= R2
R1
= R2
R1
= R2
R1 = 3R2
R1 = 3R2
R1 = 3R2
0000 0000 0000
1000 0000 0000
1111 1111 1111
0000 0000 0000
1000 0000 0000
1111 1111 1111
The accuracy of V
REFX
will be affected by the quality of R1 and
R2 and therefore, tight tolerance low tempco thin film resistors
should be used.
APPLICATIONS
STAIRCASE WINDOWS COMPARATOR
Many applications need to determine whether voltage levels are
within predetermined limits. Some requirements are for non-
overlapping windows and others for overlapping windows. Both
circuit configurations are shown in Figures 12 and 13 respectively.
GND
V
DD
AD7398/
AD7399
V
OUT
A
V
OUT
B
V
OUT
C
V
OUT
D
V
REF
V
REF
A
WINDOW 1
10k
V+
V
TEST
AD8564
AD8564
1/2 AD8564
WINDOW 2
10k
V+
WINDOW 3
10k
WINDOW 4
10k
WINDOW 5
10k
V+
V+
V+
V
REF
B
V
REF
C
V
REF
D
Figure 12. Nonoverlapping Windows Comparator
GND
V
OUT
A
V
OUT
B
V
OUT
C
V
OUT
D
V
REF
WINDOW 1
WINDOW 2
WINDOW 3
WINDOW 4
WINDOW 5
Figure 13. Nonoverlapping Windows Range
GND
AD7398/
AD7399
V
REF
C
V
OUT
A
V
OUT
B
V
OUT
C
V
OUT
D
1/2 AD8564
10k
V+
V
REF
V
REF
A
V
REF
B
WINDOW 1
10k
V+
V
TEST
AD8564
WINDOW 2
10k
V+
WINDOW 3
V
REF
D
V
DD
Figure 14. Overlapping Windows Comparator
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PDF描述 |
|---|---|
| AD7398BR | Quad, Serial-Input 12-Bit/10-Bit DACs |
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| AD7399BR | Quad, Serial-Input 12-Bit/10-Bit DACs |
| AD7399BRU-REEL7 | Quad, Serial-Input 12-Bit/10-Bit DACs |
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