CI de aquisição de dados Texas Instruments DAC5571IDBVT conversor digital-analógico 8 bits SPI 1,8–5,5 V

Texas Instruments DAC5571IDBVT is an 8-bit digital-to-analog converter (DAC) with an SPI-compatible interface, intended for data acquisition and analog signal sourcing in embedded systems, test equipment and control loops. The device converts digital codes to a proportional analog voltage and operates from a single supply in the 1.8–5.5 V range, making it suitable for low-voltage designs and battery-powered applications. The compact IC integrates the DAC core and interface logic to simplify board-level implementation and signal generation tasks.

Advantages

The DAC5571IDBVT provides an 8-bit resolution that balances compactness and sufficient precision for many control and monitoring tasks. Its SPI-compatible serial interface reduces pin count and allows straightforward integration with common microcontrollers and data acquisition controllers. Wide supply range (1.8–5.5 V) enables flexible use across low-voltage and standard systems without additional level translation. The simple implementation and stable analog output make the device appropriate for waveform generation, offset adjustments and reference sourcing in mixed-signal designs.

Suitable for

• Embedded systems requiring analog output from digital controllers
• Basic waveform generation and test signal sources
• Industrial and laboratory data acquisition front ends
• Control loops and calibration circuits

Key specifications

• Resolution: 8-bit digital-to-analog conversion
• Interface: SPI-compatible serial input
• Supply voltage: single-supply operation from 1.8 V to 5.5 V
• Output type: voltage output suitable for general-purpose analog signaling
• Package: small integrated circuit package for board-mount applications

How to use

Connect the device to the system supply within the 1.8–5.5 V range and route the SPI clock, data and chip-select lines from the host microcontroller or data acquisition controller. Send 8-bit digital words using the SPI-compatible protocol defined for the device to update the analog output. Implement appropriate decoupling on the supply pins and follow layout recommendations to minimise digital switching noise coupling into the analog output. Configure the host SPI parameters (clock polarity and phase) to match the DAC input timing to ensure reliable data transfers.

Recommendations

For stable analog performance, use low-noise power supplies and place a bypass capacitor close to the device supply pin. Add a small output filter or buffer amplifier if driving capacitive loads or long traces, and verify timing and levels on the SPI signals during system integration to prevent update errors.