12-bit, single-channel, programmable current/voltage output DAC for 4-20mA current loop applications

The DACx760 are precision, fully integrated,

12-bit and 16-bit digital-to-analog converters (DACs) designed to meet the

requirements of industrial process-control applications. These devices are

programmable as a current output with a range of 4 mA to 20 mA, 0 mA to 20 mA, or

0 mA to 24 mA; or as a voltage output with a range of 0 V to 5 V, 0 V to 10 V, ±5 V,

or ±10 V with a 10% overrange (0 V to 5.5 V, 0 V to 11 V, ±5.5 V, or ±11 V). Both

current and voltage outputs can be simultaneously enabled while being controlled by

one data register.

These devices include a power-on-reset function

for powering up in a known state (both IOUT and VOUT are disabled and in a Hi-Z

state). The CLR and CLR-SEL pins set the voltage outputs to zero-scale or midscale,

and the current output to the low end of the range if the output is enabled. Zero

and gain registers can be programmed to digitally calibrate the device in the end

system. The output slew rate is also programmable by register. These devices can

superimpose an external HART signal on the

current output, and operate with either a single 10-V to 36-V supply, or dual

supplies of up to ±18 V.