By Maurizio Di Paolo Emilio
This ebook describes the basics of knowledge acquisition structures, how they permit clients to pattern signs that degree genuine actual stipulations and convert the ensuing samples into electronic, numeric values that may be analyzed by way of a working laptop or computer. the writer takes a problem-solving method of facts acquisition, delivering the instruments engineers have to use the strategies brought. assurance contains sensors that convert actual parameters to electric indications, sign conditioning circuitry to transform sensor signs right into a shape that may be switched over to electronic values and analog-to-digital converters, which convert conditioned sensor signs to electronic values. Readers will enjoy the hands-on strategy, culminating with information acquisition initiatives, together with and software program had to construct information acquisition systems.
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Additional resources for Data Acquisition Systems: From Fundamentals to Applied Design
The volatile registers retain data as long as the device is powered. Removing power clears the volatile registers. The nonvolatile registers retain data even after power is removed. On startup, when power is first applied, data from the nonvolatile registers is transferred to the volatile registers to automatically initialize the device. Read data from the nonvolatile or volatile registers using the 2-wire serial interface . 5 Converters D/A 37 Fig. 36 MAX5109: Outline  Fig. 37 MAX5109: Typical operating characteristics  The MAX5109 features an I2C-compatible, 2-wire serial interface consisting of a bidirectional serial data line (SDA) and a serial clock line (SCL).
28 Converter D/A to eliminate glitches. Before the DAC is updated, switch SW1 is closed. The sampling capacitor samples the DC level of the previous DAC code. During a digital code transition, as the DAC is being updated, the switch is opened and the capacitor (CH) holds the DC level of the previous DAC code. The amplifier output is maintained at this DC level while the glitch occurs. After the glitch disappears, the switch closes again. The value of the T/H capacitor can be much smaller, because this capacitor is used to hold the DC level of the previous DAC code, as opposed to reducing the amplitude of a glitch.
SDA and SCL facilitate bidirectional communication between the MAX5109 and the master at rates up to 400 kHz (Fig. 40). The master (typically a microcontroller) initiates data transfer on the bus and generates SCL. SDA and SCL require pullup resistors 38 2 Data Acquisition Systems: Hardware Fig. 4 kΩ or greater). Optional resistors (24Ω ) in series with SDA and SCL protect the device inputs from high-voltage spikes on the bus lines. Series resistors also minimize crosstalk and undershoot of the bus signals.