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參數(shù)資料
| 型號(hào)： | DAC729 |
| 英文描述： | DAC729 - DISCONTINUED PRODUCT. No longer recommended for new design. |
| 中文描述： | DAC729 -已停產(chǎn)產(chǎn)品。不再推薦用于新設(shè)計(jì)。 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 251K |
| 代理商： | DAC729 |
DAC729
9
FIGURE 9. Typical Hook-Up Diagram with “Holy Point”
Ground and Kelvin Sense Load, Using Internal
Op Amp and Reference.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
+
1μF
+
1μF
+
1μF
–15V
+15V
+5V V
DD
1
Common
Digital Common
1
18-Bit
DAC
R
L
Analog
Common
I
OUT
Ref. Out
Ref. In
With the DAC connected for 0 to 10V output (Figure 13),
the adjustment procedure is to set the DAC code and mea-
sure as follows:
FOURTH MSB ADJUSTMENT (Pin 36)
1. Set Code = 11 1100 0000 0000 0000
2. Measure V
OUT
3. Set Code = 11 1011 1111 1111 1111
4. Measure V
OUT
and record the difference.
5. Adjust 4th MSB potentiometer to make difference +38
μ
V.
6. Repeat steps 1 through 5 to confirm.
THIRD MSB ADJUSTMENT (Pin 37)
1. Set Code = 11 1000 0000 0000 0000
2. Measure V
OUT
3. Set Code = 11 0111 1111 1111 1111
4. Measure V
OUT
and record the difference.
5. Adjust 3rd MSB potentiometer to make difference +38
μ
V.
6. Repeat steps 1 through 5 to confirm.
FIGURE 7. V
REF
Adjust.
R
S
1M
20k
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
Holy Point
Ground Connection
R
= 1M
Gives 20mV
Adjustment Range
Ref. Adj.
Ref. Out
Ref. In
FIGURE 8. Effect of V
REF
Adjust on a COB Connected
DAC729.
00000
H
Input = 3FFFF
H
MSB On,
All Others Off 2FFFF
H
Range of
Gain Adjust
A
Digital Input
Offset Adjust
Translates
the Line
+ Full Scale
Gain Adjust
Rotates
the Line
– Full Scale
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