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參數(shù)資料
| 型號： | 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)字到模擬轉換器 |
| 文件頁數(shù)： | 8/15頁 |
| 文件大小： | 421K |
| 代理商： | DAC8811B |
www.ti.com
THEORY OF OPERATION
V
REF
GND
I
OUT
2R
2R
2R
2R
2R
2R
2R
2R
2R
2R
2R
2R
R
FB
R
R
R
V
OUT
V
REF
CODE
65536
(1)
_
+
OPA277
V+
V
15 V
15 V
V
O
V
DD
R
FB
I
OUT
GND
DAC8811
U2
U1
V
DD
V
REF
DAC8811
SLAS411A–NOVEMBER 2004–REVISED DECEMBER 2004
The DAC8811 is a single channel current output, 16-bit digital-to-analog converter (DAC). The architecture,
illustrated in Figure 17, is an R-2R ladder configuration with the three MSBs segmented. Each 2R leg of the
ladder is either switched to GND or the I
OUT
terminal. The I
OUT
terminal of the DAC is held at a virtual GND
potential by the use of an external I/V converter op amp. The R-2R ladder is connected to an external reference
input V
that determines the DAC full-scale current. The R-2R ladder presents a code independent load
impedance to the external reference of 5 k
±
25%. The external reference voltage can vary in a range of -15 V
to 15 V, thus providing bipolar I
OUT
current operation. By using an external I/V converter and the DAC8811 R
FB
resistor, output voltage ranges of -V
REF
to V
REF
can be generated.
Figure 17. Equivalent R-2R DAC Circuit
When using an external I/V converter and the DAC8811 R
FB
resistor, the DAC output voltage is given by
Equation 1:
Each DAC code determines the 2R leg switch position to either GND or I
. Because the DAC output
impedance as seen looking into the I
OUT
terminal changes versus code, the external I/V converter noise gain will
also change. Because of this, the external I/V converter op amp must have a sufficiently low offset voltage such
that the amplifier offset is not modulated by the DAC I
terminal impedance change. External op amps with
large offset voltages can produce INL errors in the transfer function of the DAC8811 due to offset modulation
versus DAC code. For best linearity performance of the DAC8811, an op amp (OPA277) is recommended
(Figure 18). This circuit allows V
REF
swinging from -10 V to +10 V.
Figure 18. Voltage Output Configuration
8
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DAC8811C | 制造商:TI 制造商全稱:Texas Instruments 功能描述:16-Bit, Serial Input Multiplying Digital-to-Analog Converter |
| DAC8811EVM | 功能描述:數(shù)據(jù)轉換 IC 開發(fā)工具 DAC8811 Eval Mod RoHS:否 制造商:Texas Instruments 產品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| DAC8811EVM-PDK | 功能描述:數(shù)據(jù)轉換 IC 開發(fā)工具 DAC8811 Perf Demo Kit RoHS:否 制造商:Texas Instruments 產品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| DAC8811IBDGKR | 功能描述:數(shù)模轉換器- DAC 16-Bit Serial Input Multiplying Cnvtr RoHS:否 制造商:Texas Instruments 轉換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC8811IBDGKRG4 | 功能描述:數(shù)模轉換器- DAC 16-Bit Serial Input Multiplying DAC RoHS:否 制造商:Texas Instruments 轉換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
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