Sistemas de Aquisição de Dados - ULisboa · Sistemas de Aquisição de Dados Mestrado Integrado em Eng. Física Tecnológica 2007/8 Aula 2: 20 Setembro 2007

Sistemas de Aquisição de Dados

Mestrado Integrado emEng. Física Tecnológica 2007/8 Aula 2: 20 Setembro 2007

Set.2007 Sistemas de Aquisiçãõ de Dados 2007/2008 – 1º Semestre

Introdução à Aquisiçao de Dados Circuito Típico

5.1 A/D ConversionVoltage measurement during data acquisition relies on a processknown as analog-to-digital conversion (often abbreviated as A/D or A-to-D). An analog input board contains an A/D converter and supportcircuitry (Figure 5-1), which conditions and digitizes the incomingvoltage. The following list summarizes the individual circuit stages andoperation of a typical complete A/D circuit. Specialized analog inputboards may depart from this description, with multiple A/D convert-ers, large FIFO buffers, circular buffers, triggering, or other features.

• Signal conditioning (optional)

- Sensor excitation

- Filtering

- Input protection

• Multiplexer (selects a channel on multi-input A/D boards)

• Programmable instrumentation amplifier (applies gain)

• A/D converter (digitizes the signal)

• FIFO buffer (temporarily stores measurement data)

• Control circuitry (retrieves data from FIFO buffer)

Figure 5-1. Typical A/D converter and associated circuitry

5.1.1 A/D Resolution and SpeedThree of the most important specifications involved in choosing ananalog input board are A/D converter resolution, accuracy, and speed.These specifications and other A/D characteristics are interrelated,because higher performance in one area may come at the expense ofperformance in other areas. For example, high speed and high resolu-tion are usually mutually exclusive to some degree, and achieving both

!-" SECTION 5

InputProtection Multiplexer

InstrumentationAmplifier

ChannelSelect

GainSelect

CTRLControl

A/DConversion

Data

Data

Bus

A...

FIFOCondicionamento de Sinal:•Protecção•Amplificação (Unipolar/Diferencial)•Isolamento•Filtragem•MUX•Amostragem e Retenção (S&H)


Aquisição de dados

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Bibliografia

Data Conversion Handbook Analog Devices Inc., 2004

http://www.analog.com/library/analogDialogue/archives/39-06/data_conversion_handbook.html

Documents

Sistemas de Aquisição de Dados - ULisboa · Sistemas de Aquisição de Dados Mestrado Integrado em Eng. Física Tecnológica 2007/8 Aula 2: 20 Setembro 2007