DAC8771EVM

Thisuser’sguidedescribes thecharacteristicsanduseof theDAC8771evaluationboard(EVM). Italso discusseshowtosetupandconfigure thesoftwareandhardware forproperoperation.Throughout this document, the terms evaluation board, evaluation module, and EVM are synonymous with the DAC8771EVM.

1 Overview

The DAC8771 is a single-channel (quad) 16-bit precision digital-to-analog converter (DAC). The output can be configured to produce a current in output ranges of 0 to 20 mA, 0 to 24 mA, 3.5 to 23.5 mA, or ±24 mA. It can also be configured for voltage output in ranges of 0 to 5 V, 0 to 6 V, 0 to 10 V, 0 to 12 V, ±5 V, ±6 V, ±10 V, or ±12 V. The DAC8771 includes an integrated buck-boost converter to generate all necessary power supplies from a single external supply. The buck-boost converter features various operating modes that can be used to enhance power dissipation and thermal performance. The DAC8771 features additional peripherals including: HART input pins for coupling of FSK HART voltage signals, slew rate control for the analog output, and reliability features such as CRC, watchdog timer, and conditional alarms.

2 EVM Hardware Overview

This section discusses the overall system setup for the EVM. A personal computer (PC) runs the software that communicates with the SM-USB-DIG platform, which provides the power and digital signals used to communicate with the EVM board. Connectors on the EVM board allow the user to connect the required external power supplies for the configuration under test. The SM-USB-DIG must be connected to the DAC8771EVM with the Texas Instruments logo facing up.