AD5421CREZ-RL7

Digital To Analog Converters Overview

The AD5421CREZ-RL7 is a 16-bit, serial input, loop-powered digital-to-analog converter (DAC) designed for industrial process control applications. It provides a fully integrated solution with a regulated voltage output and internal references, eliminating the need for discrete components. The device supports pin-selectable NAMUR-compliant current ranges including 4 mA to 20 mA, 3.8 mA to 21 mA, and 3.2 mA to 24 mA. It features a high-speed SPI-compatible interface operating up to 30 MHz and includes on-chip fault alerts. The component operates over an extended industrial temperature range of −40°C to +105°C and is housed in a 28-lead TSSOP package.

Digital To Analog Converters Feature Summary

• 16-bit resolution with guaranteed monotonicity and total unadjusted error (TUE) of ±0.041% FSR at 25°C
• Pin-selectable NAMUR-compliant current ranges: 4 mA to 20 mA, 3.8 mA to 21 mA, and 3.2 mA to 24 mA
• Integrated 1.22 V and 2.5 V voltage references and a regulated voltage output (1.8 V to 12 V)
• SPI-compatible 3-wire serial interface with automatic readback of fault registers

Digital To Analog Converters Applications

• Industrial process control systems
• 4 mA to 20 mA loop-powered transmitters
• Smart transmitters with HART network connectivity

Digital To Analog Converters Procurement Notes

Verify the specific grade (A, B, or C) required for your application, as accuracy specifications such as Total Unadjusted Error (TUE) vary significantly between grades. Confirm that the external reference voltage connected to REFIN is 2.5 V for specified performance. Ensure the loop voltage remains within the 5.5 V to 52 V range during operation.

Digital To Analog Converters Selection Notes

Select the appropriate current setting method by connecting RINT/REXT to DVDD for internal resistance or COM for an external 24 kΩ resistor to improve accuracy. Choose the loop current range using RANGE0 and RANGE1 pins based on NAMUR compliance requirements. Consider the thermal resistance (θJA) of the TSSOP package when designing for high ambient temperatures.

Digital To Analog Converters Part Context

This part belongs to the AD5421 family of loop-powered DACs. The CREZ suffix indicates the C grade accuracy level, the E package code corresponds to the 28-lead TSSOP, Z denotes lead-free status, and RL7 specifies the reel packaging format. Companion products include the AD5700 HART modem and ADuCM360 microcontroller.

Digital To Analog Converters Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.