DAC7750IPWPR.B datasheet(19/56 Pages) TI2

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8 Detailed Description

8.1 Overview

The DAC8750 and DAC7750 are low-cost, precision, fully-integrated, 16-bit and 12-bit digital-to-analog

converters (DACs) designed to meet the requirements of industrial process control applications. These devices

can be programmed as a current output with a range of 4 mA to 20 mA, 0 mA to 20 mA, or 0 mA to 24 mA. The

DAC8750 and DAC7750 include reliability features such as CRC error checking on the serial peripheral interface

(SPI) frame, a watchdog timer, an open circuit, compliance voltage, and thermal alarm. In addition the output

current can be monitored by accessing an internal precision resistor.

These devices include a power-on-reset function to ensure powering up in a known state (both IOUT is disabled

and in a high-impedance state). The CLR pin sets the current output to the low-end of the range if the output is

enabled. Zero code error and gain error calibration registers can be programmed to digitally calibrate the device

in the end system. The output slew rate is also programmable. These devices can AC couple an external HART

signal on the current output and can operate with either a 10-V to 36-V supply.

8.2 Functional Block Diagram

GND

DACx750

AVDD

DVDD-EN

DVDD

Slew Rate

Control

User Calibration

Gain/Offset

DAC Input

Thermal

Alarm

Internal

Reference

REFOUT

REFIN

HART-IN

LATCH

SCLK

DIN

SDO

CLR

DAC

Pre-

Conditioning

Current

Source

ENABLE

ISET-R

GAIN

Current Output Stage

IOUT

ALARM

BOOST

R3-SENSE

Watchdog

Timer

www.ti.com

DAC7750, DAC8750

SBAS538D – DECEMBER 2013 – REVISED DECEMBER 2021

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