AD5422AREZ

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1. DESCRIPTION

The AD5422AREZ are low cost, precision, fully integrated 12-/16-bit digital-to-analog converters (DAC) offering a programmable 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.

2. FEATURES

    1. 12-/16-bit resolution and monotonicity 

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

    3. ±0.01% FSR typical total unadjusted error (TUE)

    4. ±3 ppm FSR/°C output drift

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

    6. 10% overrange

    7. ±0.01% FSR typical TUE

    8. ±2 ppm FSR/°C output drift

    9. Flexible serial digital interface

  10. On-chip output fault detection

  11. On-chip reference: 10 ppm/°C maximum

  12. Optional regulated DVCC output 

  13. Asynchronous clear function

  14. Power supply range

        - AVDD: 10.8 V to 40 V

        - AVSS: −26.4 V to −3 V/0 V

  14. Current loop compliance voltage: AVDD – 2.5 V

  15. Temperature range: −40°C to +105°C 

  16. TSSOP and LFCSP packages

3. APPLICATIONS

    1. Process controls

    2. Actuator controls

    3. PLC

    4. HART network connectivity (LFCSP package only)

4. PIN CONFIGURATIONS

5. FUNCTION DESCRIPTIONS

6. Principle of Operation

AD5422AREZ is a precision digital to current loop and The voltage output converter is designed to meet the following requirements Industrial process control applications. They provide high Precision, fully integrated, low-cost single-chip solution for Generate current loop and unipolar/bipolar voltage output. Current ranges are 0 mA to 20 mA, 0 mA to 24 mA, and 4 mA To 20 mA; available voltage range is 0 V to 5 V, ±5 V, 0 V To 10 V and ±10 V; all voltages provide 10% overrange Output range. Current and voltage output can be Individual pins, and only one is active at any time. Required The user can select the output configuration through the control register.

7. architecture

The DAC core architecture of AD5422AREZ includes Two matched DAC parts. Four MSBs of a 12-bit/16-bit data word It is decoded to drive 15 switches, E1 to E15. Each of these switches Connect one of the 15 matching resistors to ground or Reference buffer output. The remaining 8/12 bits of the data word drive the 8/12-bit voltage S0 to S7/S11 switches Model R-2R ladder network. The voltage output of the DAC core is either converted to A current is then mirrored to the power supply Rail so that the application only sees the current source output Relative to the ground, or it is buffered and scaled for output Software selectable unipolar or bipolar voltage range. Separate output of current and voltage pin cannot be output at the same time

8. Voltage output amplifier

Voltage output amplifier can produce unipolar And bipolar output voltage. It can drive the load 1 kΩ in parallel with 1 µF (with external compensation Capacitor) to ground. Slew rate 1 V/µs, the maximum full-scale settling time is 25 µs (10 V step). The voltage output RLOAD that drives the load, Above the common mode voltage (VCM) of -1 V to +3 V. In Output module application, where the cable may be Disconnected from +VSENSE, causing the amplifier The cycle is broken and can cause huge damage Voltage on VOUT, including an optional resistor (R1) +VSENSE and VOUT, between 2 kΩ and 5 kΩ to ensure that the amplifier loop remains closed. if No need to remotely sense the load, connect +VSENSE Connect directly to VOUT and connect −VSENSE directly to GND. when If the voltage output range is changed, glitches may appear. for Therefore, it is recommended to disable the output in the following ways Previously set the OUTEN bit of the control register to logic low Change the output voltage range; this can prevent malfunctions happen.

9. Drive large capacitive loads

Voltage output amplifier capable of driving capacitor Loads up to 1 µF and added a non-polarized 4 nF Compensation capacitor between CCOMP and VOUT pins. No compensation capacitor, capacitance up to 20 nF Can drive the load.