Dual-channel, 12-bit, ±20-V-range, buffered-output DAC with precision internal reference

The 16-bit DAC81402 and 12-bit DAC61402 (DACx1402) are

pin-compatible, dual-channel, buffered, high-voltage-output, digital-to-analog

converters (DACs). These devices include a low-drift, 2.5-V internal reference that

eliminates the need for an external precision reference in most applications. The

devices are specified monotonic and provide high linearity of ±1 LSB INL.

Additionally, the devices implement per channel sense pins that eliminate IR drops

and sense up to ±12 V of ground bounce.

A user-selectable output configuration

enables full-scale bipolar output voltages of ±20 V, ±10 V, and ±5 V; and full-scale

unipolar output voltages of 40 V, 20 V, 10 V and 5 V. The full-scale output range

for each DAC channel is independently programmable. The integrated DAC output

buffers can sink or source up to 15 mA, thus limiting the need for additional

operational amplifiers.

The DACx1402 incorporate a power-on-reset circuit that connects the DAC

outputs to ground at power up. The outputs remain in this mode until the device is

properly configured for operation. The devices include additional reliability

features such as a CRC error check, short-circuit protection, and a thermal

alarm.

Communication to the devices is

performed through a 4-wire serial interface that supports operation from 1.7 V to

5.5 V.