Single Channel, 12-Bit, Current Source & Voltage Output DAC, HART Connectivity

The AD5412/AD5422 are low cost, precision, fully integrated 12-/16-bit digital-to-analog converters (DAC) offering a pro-grammable current source and programmable voltage output designed to meet the requirements of industrial process control applications.

The output current range is programmable at 4 mA to 20 mA, 0 mA to 20 mA, or an overrange function of 0 mA to 24 mA.

The LFCSP version of this product has a CAP2 pin so that the HART signals can be coupled onto the current output of the AD5412/AD5422.

Voltage output is provided from a separate pin that can be configured to provide 0 V to 5 V, 0 V to 10 V, ±5 V, or ±10 V output ranges; an overrange of 10% is available on all ranges.

Analog outputs are short and open-circuit protected and can drive capacitive loads of 1 μF.

The device operates with an AVDD power supply range from 10.8 V to 40 V. Current loop compliance voltage is 0 V to AVDD − 2.5 V.

The flexible serial interface is SPI- and MICROWIRE™-compatible and can be operated in 3-wire mode to minimize the digital isolation required in isolated applications.

The device also includes a power-on-reset function, ensuring that the device powers up in a known state. The part also includes an asynchronous clear pin (CLEAR) that sets the outputs to zero-scale/midscale voltage output or the low end of the selected current range.

The total output error is typically ±0.01% in current mode and ±0.01% in voltage mode.

Applications

* Process controls

* Actuator controls

* PLC

* HART network connectivity (LFCSP package only)

* 12-bit resolution and monotonicity

* Current output ranges: 4 mA to 20 mA, 0 mA to 20 mA, or 0 mA to 24 mA

* ±0.01% FSR typical total unadjusted error (TUE)

* ±3 ppm FSR/°C output drift

* Voltage output ranges: 0 V to 5 V, 0 V to 10 V, ±5 V, or ±10 V

* 10% overrange

* ±0.01% FSR typical TUE

* ±2 ppm FSR/°C output drift

* Flexible serial digital interface

* On-chip output fault detection

* On-chip reference: 10 ppm/°C maximum

* Optional regulated DVCC output

* Asynchronous clear function

* Power supply range

* AVDD: 10.8 V to 40 V

* AVSS: −26.4 V to −3 V/0 V

* Current loop compliance voltage: AVDD – 2.5 V

* Temperature range: −40°C to +105°C

* TSSOP and LFCSP packages