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參數(shù)資料
| 型號(hào)： | DAC7811IDRCT |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 12-Bit, Serial Input, Multiplying Digital-to-Analog Converter |
| 中文描述： | 12位，串行輸入，乘法數(shù)字到模擬轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 14/18頁(yè) |
| 文件大小： | 698K |
| 代理商： | DAC7811IDRCT |
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P
Z
O
R1 R3 R1
R3
R2
R1 R2
R1 R2
R3
(4)
R2
′
15k
I
OUT1
R
FB
GND
V
DD
V
DD
V
REF
V
OUT
I
L
LOAD
C
1
10pF
U2
OPA277
R1
′
150k
R3
′
50k
R3
50
R1
150k
R2
15k
U2
OPA277
U1
DAC7811
I
OUT2
Cross-Reference
The DAC7811 has an industry-standard pinout. Table 4 provides the cross-reference information.
DAC7811
SBAS337–APRIL 2005
APPLICATION INFORMATION (continued)
The value of R3 in the previous equation can be reduced to increase the output current drive of U3. U3 can drive
±
20 mA in both directions with voltage compliance limited up to 15 V by the U3 voltage supply. Elimination of the
circuit compensation capacitor C1 in the circuit is not suggested as a result of the change in the output
impedance Z
O
, according to Equation 4:
As shown in Equation 4, with matched resistors, Z
O
is infinite and the circuit is optimum for use as a current
source. However, if unmatched resistors are used, Z
O
is positive or negative with negative output impedance
being a potential cause of oscillation. Therefore, by incorporating C1 into the circuit, possible oscillation problems
are eliminated. The value of C1 can be determined for critical applications; for most applications, however, a
value of several pF is suggested.
Figure 32. Programmable Bidirectional Current Source Circuit
Table 4. Cross-Reference
SPECIFIED
TEMPERATURE
RANGE
–40
°
C to +125
°
C
PACKAGE
DESCRIPTION
10-Lead MicroSOIC
PACKAGE
OPTION
MSOP-10
CROSS-
PRODUCT
DAC7811
INL (LSB)
±
1
DNL (LSB)
±
1
REFERENCE PART
AD5443YRM
14
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