AD420ANZ-32

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1. Description

AD420ANZ-32 is a complete digital to current loop output Converter, designed to meet the needs of industrial control market. It provides high precision, fully integrated low cost Single chip solution for Compact 24-pin SOIC or PDIP package.The output current range can be set from 4 mA to 20 mA, 0 mA to 20 mA or over-range function 0 mA to 24 mA AD420ANZ-32 can provide voltage output alternatively 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, and add an external Buffer amplifier. 3.3 M baud serial input logic design minimizes cost Galvanic isolation and allows simple connection to the usual Used microprocessors. Can be used for 3-wire or asynchronous Mode and provide a serial output pin to allow daisy chain connection There are multiple DACs on the current loop side of the isolation barrier. AD420ANZ-32 adopts sigma-delta (Σ-Δ) DAC technology to realize 16-bit monotonicity and very low cost. Stable to 0.1% of full scale Occurs within 3 milliseconds. The only external component is Required (except for ordinary transient protection circuits) There are two low-cost capacitors for the DAC output filter.If AD420ANZ-32 is used under extreme temperature and power supply Voltage, you can use an external output transistor to reduce Power consumption on the chip through the BOOST pin. error When an open circuit occurs in the loop, the DETECT pin sends a signal. On-chip voltage reference can be used to provide high accuracy + The voltage of components other than AD420ANZ-32 is +5 V, or The user wants the temperature stability to exceed 25 ppm/°C, External accuracy reference can be used as Reference materials. AD420ANZ-32 provides 24-pin SOIC and The industrial temperature range of PDIP is −40°C to +85°C.

2. Features

    1. AD420 is a single-chip solution that can generate 4 mA of current 20 mA or 0 mA to 20 mA signal at the controller Current cycle.

    2. The power supply range of AD420 is 12 V to 32 V. The output loop compliance is 0 V to VCC − 2.75 V.

    3. Flexible serial input can be used in 3-wire mode Use with SPI® or MICROWIRE® microcontrollers Asynchronous mode to minimize Need control signal.

    4. The serial data output pin can be used for daisy chain connection In 3-wire mode, up to two AD420s can be accommodated at the same time.

    5. When power on, AD420 initializes its output to low level The end of the selected range.

    6. AD420 has an asynchronous CLEAR pin, which sends Output to the low end of the selected range (0 mA, 4 mA, Or 0 V).

    7. AD420 BOOST pin can accommodate an external The transistor can reduce the power consumption of the chip.

    8. The deviation is ±0.05%, and the total output error is ±0.15% If necessary, two external potentiometers can be used for trimming.

    9. 4 mA–20 mA, 0 mA–20 mA or 0 mA–24 mA current output

  10. 16-bit resolution and monotonicity

  11. ±0.012% max integral nonlinearity

  12. ±0.05% max offset (trimmable)

  13. ±0.15% max total output error (trimmable)

  14. Flexible serial digital interface (3.3 MBPS)

  15. On-Chip loop fault detection

  16. On-chip 5 V reference (25 ppm/°C max)

  17. Asynchronous CLEAR function

  18. Maximum power supply range of 32 V

  19. Output loop compliance of 0 V to VCC − 2.75 V

  20. 24-Lead SOIC and PDIP packages

3. PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

4. FUNCTIONAL BLOCK DIAGRAM