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參數(shù)資料
| 型號(hào)： | DAC8811B |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 16-Bit, Serial Input Multiplying Digital-to-Analog Converter |
| 中文描述： | 16位串行輸入乘法數(shù)字到模擬轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 10/15頁(yè) |
| 文件大?。?/td> | 421K |
| 代理商： | DAC8811B |
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GND
OPA277
2.5V
GND
0 V
OUT
+2.5V
V
OUT
I
OUT
OPA277
C1
R
FB
DAC8811
V
DD
V
DD
+2.5V Reference
V
IN
V
OUT
V
REF
+
+
Bipolar Output Circuit
The DAC8811, as a 2-quadrant multiplying DAC, can be used to generate a unipolar output. The polarity of the
full-scale output I
OUT
is the inverse of the input reference voltage at V
REF
.
Some applications require full 4-quadrant multiplying capabilities or bipolar output swing. As shown in Figure 22,
external op amp U4 is added as a summing amp and has a gain of 2X that widens the output span to 5 V. A
4-quadrant multiplying circuit is implemented by using a 2.5-V offset of the reference voltage to bias U4.
According to the circuit transfer equation given in Equation 2, input data (D) from code 0 to full scale produces
output voltages of V
OUT
= -2.5 V to V
OUT
= +2.5 V.
V
OUT
D
32,768
1
V
REF
(2)
R
FB
OPA277
U4
2.5V V
OUT
+2.5V
(10V V
OUT
+10V)
V
OUT
10 k
10 k
+2.5V
(+10V)
V
REF
V
DD
V
DD
GND
DAC8811
OPA277
U2
I
OUT
C1
C2
5 k
+
+
Programmable Current Source Circuit
A DAC8811 can be integrated into the circuit in Figure 23 to implement an improved Howland current pump for
precise voltage to current conversions. Bidirectional current flow and high voltage compliance are two features of
the circuit. With a matched resistor network, the load current of the circuit is shown by Equation 3:
I
L
R2
R3
R3
R1
V
REF
D
(3)
DAC8811
SLAS411A–NOVEMBER 2004–REVISED DECEMBER 2004
APPLICATION INFORMATION (continued)
Figure 21. Positive Voltage Output Circuit
External resistance mismatching is the significant error in Figure 22.
Figure 22. Bipolar Output Circuit
10
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DAC8811C | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:16-Bit, Serial Input Multiplying Digital-to-Analog Converter |
| DAC8811EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開(kāi)發(fā)工具 DAC8811 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類(lèi)型:ADC 工具用于評(píng)估:ADS130E08 接口類(lèi)型:SPI 工作電源電壓:- 6 V to + 6 V |
| DAC8811EVM-PDK | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開(kāi)發(fā)工具 DAC8811 Perf Demo Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類(lèi)型:ADC 工具用于評(píng)估:ADS130E08 接口類(lèi)型:SPI 工作電源電壓:- 6 V to + 6 V |
| DAC8811IBDGKR | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Serial Input Multiplying Cnvtr RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類(lèi)型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC8811IBDGKRG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Serial Input Multiplying DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類(lèi)型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
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