数据采集
Acquiring data from sensors involves measurement and processing of real world analog voltages and currents. Typical devices used in the data acquisition signal chain are amplifiers, multiplexers, isolators, and ADC’s. In some cases measurement accuracy can be improved by providing an offset voltage via a DAC. System requirements for accuracy, bandwidth and input range dictate the selection of amplifiers and ADCs. A DSP or μ-controller is used to process the digital signals for display or analysis.
应用笔记
- AN-928 : Understanding High Speed DAC Testing and Evaluation
(pdf, 4445 kB)
- AN-892 : Temperature Measurement Theory and Practical Techniques
(pdf, 733 kB)
- AN-878 : High Speed ADC SPI Control Software
(pdf, 585 kB)
- AN-877 : Interfacing to High Speed ADCs via SPI
(pdf, 1594 kB)
- AN-847 : Measuring a Grounded Impedance Profile Using the AD5933
(pdf, 294 kB)
- AN-843 : Measuring a Loudspeaker Impedance Profile Using the AD5933 (Rev. A, 6/07)
(pdf, 284 kB)
- AN-840 : Code Update via I2C®
(pdf, 387 kB)
- AN-840 Companion Code (zip, 101 kB)
- AN-840 Companion Code (zip, 101 kB)
- AN-837 : DDS-Based Clock Jitter Performance vs. DAC Reconstruction Filter Performance
(pdf, 313 kB)
- AN-835 : 高速ADC测试和评估
(pdf, 0)
- AN-835 : Understanding High Speed ADC Testing and Evaluation
(pdf, 1326 kB)
- AN-803 : Pin Compatible High Speed ADCs Simplify Design Tasks
(pdf, 356 kB)
- AN-793 : ESD/Latch-Up Considerations with iCoupler® Isolation Products
(pdf, 246 kB)
- AN-769 : Generating Multiple Clock Outputs from the AD9540
(pdf, 130 kB)
- AN-742 : Frequency Domain Response of Switched-Capacitor ADCs
(pdf, 321 kB)
- AN-741 : Little Known Characteristics of Phase Noise
(pdf, 1679 kB)
- AN-737 : How ADIsimADC Models an ADC
(pdf, 373 kB)
- AN-726 : Triple-Supply Power-Good Indication with the ADM108x
(pdf, 75 kB)
- AN-715 : A First Approach to IBIS Models: What They Are and How They Are Generated
(pdf, 370 kB)
- AN-586 : LVDS Outputs for High Speed A/D Converters
(pdf, 207 kB)
High Speed ADCs Uses LVDS (Low-Voltage Differential Signaling) to Minimize Performance Limitations In ADC Applications When Providing High Speed Data Output - AN-584 : AD813x的运用
(pdf, 0)
AD813x与常规运算放大器的不同之处在于，它有一个附加的输入端和一个附加的输出端。附加输入端VOGM用于控制输出共模电压。附加输出端相当于常规运算放大器单端输 出的模拟互补输出。在工作时，AD813x采用两个反馈环路，常规运算放大器则采用单环路。这种配置为各种新型电路的设计提供了极大自由，而且仍然可以使用有关运算放大器的基本原理来分析其工作模式。 - AN-584 : Using the AD813X Differential Amplifier
(pdf, 174 kB)
The AD813x differs from conventional op amps by the external presence of an additional input and output. The additional input, VOGM, controls the output common mode voltage. - AN-573 : OP07 Is Still Evolving
(pdf, 155 kB)
- AN-501 : Aperture Uncertainty and ADC System Performance
(pdf, 227 kB)
A Key Concern in IF Sampling is that of Aperture Uncertainty (Jitter) - AN-417 : Fast Rail-to-Rail Operational Amplifiers Ease Design Constraints in Low Voltage High Speed Systems
(pdf, 228 kB)
Movement towards lower power supply voltages is driven by the demand that systems consume less and less power coupled with the desire to reduce the number of power supply voltages in the system. The following applications are discussed: Single-Ended and Differential Input ADC Input Circuits, Video Line Driver, Active Filter, HDSL Transceiver, and Transformer Drive Circuits. - AN-410 : 0: Overcoming Converter Nonlinearities with Dither
(pdf, 115 kB)
- AN-402 : Replacing Output Clamping Op Amps with Input Clamping Amps
(pdf, 55 kB)
So far most clamping amplifiers have relied upon an output clamping architecture and are called output clamp amps (OCAs). A new architecture called an input clamp amp (ICA) offers superior clamping accuracy and lower distortion. - AN-282 : Fundamentals of Sampled Data Systems
(pdf, 2131 kB)
- AN-257 : Careful Design Tames High Speed Op Amps
(pdf, 611 kB)
- AN-138 : SPICE-Compatible Op Amp Macro-Models
(pdf, 838 kB)
- AN-117 : OP-42 Advanced SPICE Macro-Model
(pdf, 168 kB)
- AN-113 : AB-113: Precision Ramp Generator
(pdf, 54 kB)
- AN-112 : AB-112: Single Resistor Controls Wien Bridge Oscillator Frequency
(pdf, 18 kB)
Frequency control can be added to the conventional Wien Bridge Circuit by adding an op amp inverter. - AN-111 : AB-111: Single-Supply Wien Bridge Oscillator
(pdf, 66 kB)
Wien Bridge Oscillators require only one op amp, important in battery-operation. This circuit operates from a single 9V battery. - AN-109 : AB-109: High Speed Precision Rectifier
(pdf, 24 kB)
The low offsets and excellent load driving capability of the OP-27 are key advantages in this precision rectifier circuit. - AN-108 : 08: JFET-Input Amps are Unrivaled for Speed and Accuracy
(pdf, 499 kB)
Ask the Experts
- Analog Devices, Inc. Application Engineering Department
For technical support and additional information, please contact our experienced applications engineers who are readily available to assist you.
Thank you.
概况
技术文章
- Charge Your SAR-Converter Inputs
(EDN, 5/11/2006) - Data-acquisition system uses fault protection
By Catherine Redmond, Analog Devices, Inc. (EDN, 4/15/2004)