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參數(shù)資料
| 型號： | AD5545 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dual, Current-Output, Serial-Input, 16-/14-Bit DAC |
| 中文描述： | 雙通道，電流輸出，串行輸入，16-/14-Bit援 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 1419K |
| 代理商： | AD5545 |
AD5545/AD5555
If the resistors are perfectly matched,
Z
O
is infinite, which is
desirable, and the resistors behave as an ideal current source.
On the other hand, if they are not matched,
Z
O
can be either
positive or negative. The latter can cause oscillation. As a result,
C1 is needed to prevent the oscillation. For critical applications,
C1 could be found empirically but typically falls in the range of
a few pF.
Rev. 0 | Page 14 of 16
R
WB
and
R
WA
are digital potentiometer 128-step programmable
resistances and are given by
AB
C
WB
R
R
D
128
≈
(8)
AB
C
WA
R
R
D
128
128
≈
(9)
C
C
WA
R
WB
R
D
D
≈
128
(10)
AD5545/AD5555
AD8628
AD8510
V–
V
REF
V
REF
I
OUT
V
DD
V
DD
V
DD
C1
10pF
V
SS
LOAD
GND
02918-0-023
V
L
I
L
R
FB
U2
U3
U1
V+
R3'
50
R1'
150k
R2'
15k
R1
150k
R2
15k
R3
50
where
D
C
= Digital Potentiometer Digital Code in Decimal
(0 ≤ D
C
≤ 127).
By putting Equations 7 through 10 together, the following
results:
C
C
N
A
C
C
REF
V
REF
V
D
D
D
2
D
D
AB
×
+
×
=
128
1
128
1
(11)
Table 9 shows a few examples of V
REF
AB of the 14-bit AD5555.
Table 9. V
REF
AB
vs. D
B
and D
C
of the AD5555
D
C
D
A
0
X
32
0
32
8192
64
0
64
8192
96
0
96
8192
V
REF
AB
V
REF
1.33 V
REF
1.6 V
REF
2 V
REF
4 V
REF
4 V
REF
–8 V
REF
Figure 23. Programmable Current Source with Bidirectional
Current Control and High Voltage Compliance Capabilities
DAC WITH PROGRAMMABLE INPUT
REFERENCE RANGE
Since high voltage references can be costly, users may consider
using one of the DACs, a digital potentiometer, and a low
voltage reference to form a single-channel DAC with a
programmable input reference range. This approach optimizes
the programmable range as well as facilitates future system
upgrades with just software changes. Figure 24 shows this
implementation. V
REF
AB
is in the feedback network, therefore,
The output of DAC B is, therefore,
N
B
REF
V
OB
D
2
AB
V
=
(12)
where
D
B
is the DAC B digital code in decimal.
The accuracy of
V
REF
AB
will be affected by the matching of the
input and feedback resistors and, therefore, a digital potenti-
ometer is used for U4 because of its inherent resistance
matching. The AD7376 is a 30 V or ±15 V, 128-step digital
potentiometer. If 15 V or ±7.5 V is adequate for the application,
a 256-step AD5260 digital potentiometer can be used instead.
×
×
+
×
=
WA
R
WB
R
N
A
REF_AB
V
WA
R
WB
R
REF
V
REF
V
2
D
AB
–
–
1
(7)
where:
V
REF
AB
= Reference Voltage of V
REF
A and V
REF
B
V
REF
= External Reference Voltage
D
A
= DAC A Digital Code in Decimal
N
= Number of Bits of DAC
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