AD5423BCPZ-RL7

Overview

The AD5423BCPZ-RL7 is a single-channel, 16-bit digital-to-analog converter (DAC) from Analog Devices Inc., housed in a 32-lead, 5 mm × 5 mm LFCSP package. It provides both current and voltage outputs on a shared VIOUT terminal. The device supports wide supply ranges, with AVDD1 and AVSS spanning −33 V to +33 V, and VLOGIC operating between 1.71 V and 5.5 V. Key electrical specifications include a settling time of 12 µs for a 10 V step, an integral nonlinearity (INL) of ±0.006% FSR, and differential nonlinearity (DNL) of ±1 LSB. It features an integrated 12-bit ADC for diagnostics and HART connectivity via the CHART pin.

Feature Summary

• 16-bit resolution with guaranteed monotonicity across all output ranges.
• Integrated 12-bit diagnostic ADC for background monitoring of supplies and temperature.
• HART protocol support enabled via the CHART pin for process control applications.
• Versatile 4-wire SPI interface supporting clock rates up to 50 MHz with optional CRC and watchdog timer.

Applications

• Process control systems requiring high-precision analog outputs.
• Actuator control loops in industrial automation.
• Programmable logic controllers (PLC) and distributed control systems (DCS).
• HART network connectivity for remote sensor data transmission.

Procurement Notes

Verify the specific suffix RL7 indicates reel packaging when sourcing. Confirm that the BC grade meets the required temperature and accuracy specifications for the target application environment. Ensure power supply rails match the specified ranges for optimal performance.

Selection Notes

Select this component for applications requiring simultaneous current and voltage output capabilities on a single channel. Consider the integrated 12-bit ADC if system diagnostics are required without additional external components. Verify SPI compatibility with the host microcontroller, noting the 50 MHz maximum clock rate.

Part Context

The AD5423 belongs to the AD54xx family of precision DACs designed for industrial process control. It complements companion products like the AD5700 HART modem and ADR431 reference. The device replaces older generations by offering enhanced diagnostic features and higher integration levels within a compact LFCSP footprint.

Replacement Considerations

The AD5422 is listed as a direct companion product within the same family. Verify pinout and register compatibility before substitution. Other members of the AD575x series may offer similar functionality but require evaluation of specific interface and output differences.

FAQ

What is the function of the CHART pin?

The CHART pin allows the coupling of a HART signal onto the current output. It must be AC-coupled to the HART source and can be enabled via the HART_EN bit in the General Purpose Configuration1 register.

How does the AD5423 handle output fault detection?

The FAULT pin is an active-low, pseudo open-drain output that asserts low when faults such as open circuits in current mode, short circuits in voltage mode, CRC errors, or overtemperature conditions are detected.

What is the maximum serial clock speed for write operations?

The serial peripheral interface (SPI) supports clock speeds of up to 50 MHz during write operations, depending on the VLOGIC voltage level.