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參數(shù)資料
| 型號(hào)： | DAC8531EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DAC8531 Evaluation Module(DAC8531評(píng)估板) |
| 中文描述： | DAC8531評(píng)估模塊（DAC8531評(píng)估板） |
| 文件頁(yè)數(shù)： | 32/42頁(yè) |
| 文件大?。?/td> | 788K |
| 代理商： | DAC8531EVM |
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Host Processor Interface
3-10
Table 3
–
6.Bipolar Operation Output Jumper Settings
Reference
Jumper
Setting
Function
W7
2
–
3
Select 5 V for the positive rail supply of U12 if W12 is closed
W8
2
–
3
Select
–
5 V for the negative supply rail of U12 if W12 is closed
W10
Closed
Connect V
REF
to the negative input of op-amp for negative biasing
W11
Open
Disconnect R12
W12
Close
Supplies the constant 5 V to the positive rail of U12 and is also fed into the negative
input of U17 to generate an output voltage of
–
5 V.
W13
3
–
4
Buffered output of DAC is channeled to the output terminals
An example in Figure 3
–
8 shows the sinusoid signal in channel 1 being
amplified within the range of
±
V
REF
shown in channel 2. The reference
voltage, V
REF
,
is set to 5 V, which is then supplied to the negative input of U12
to bias the circuit to its negative rail. This provides an output of
±
5 V with 0000h
corresponding to a
–
5-V output and FFFFh corresponding to 5-V output.
The output voltage for any input code can be calculated as follows:
VO
VREF
D
65536
R1
R2
R1
VREF
R2
R1
where D represents the input code in decimal (0
–
65536).
With V
REF
= 5 V, R1 = R2 = 10 k
:
VO
10
65536
D
5 V
Figure 3
–
8.DAC8531 Bipolar Output of Operation
DAC8531 Output
Bipolar Output
Similarly, adjusting the V
REF
voltage to any desired value less than 5 V
produces a voltage output range of
±
V
REF
.
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