AD7237AARZ

Overview

The AD7237AARZ is a dual 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices, packaged in a 24-lead SOIC. It integrates on-chip voltage reference and output amplifiers, eliminating the need for external trimming. The device features an improved interface with a typical 30 ns data setup time and supports parallel loading via an 8+4 bit structure. It operates from single or dual supplies ranging from +10.8 V to +16.5 V (VDD) and -10.8 V to -16.5 V (VSS). Key static performance metrics include ±1 LSB relative accuracy, 8 µs settling time, and 165 mW typical power dissipation in single-supply mode.

Feature Summary

• Dual 12-bit DACPORT architecture with integrated 5 V Zener reference and buffered outputs
• Improved interface logic supporting 8-bit microprocessors with 8+4 bit parallel loading structure
• Flexible supply operation: Single (+12 V to +15 V) or Dual (±12 V to ±15 V)
• Configurable output ranges: 0 V to +5 V, 0 V to +10 V (unipolar), and ±5 V (bipolar)

Applications

• Industrial process control systems requiring precise analog signal generation
• Microprocessor-based instrumentation with 8-bit data buses
• Programmable power supplies and test equipment

Procurement Notes

Verify the specific suffix 'ARZ' corresponds to the 24-lead SOIC package and industrial temperature range (-40°C to +85°C). Confirm RoHS compliance status as manufacturing processes may evolve. Check for availability of the REEL7 variant if tape-and-reel packaging is required for automated assembly. Ensure ESD precautions are observed during handling due to CMOS sensitivity.

Selection Notes

Select the AD7237AARZ over the AD7247A when interfacing with 8-bit microprocessors, as it utilizes an 8+4 bit loading structure rather than a full 12-bit parallel interface. Choose this model for applications requiring simultaneous update capabilities via the asynchronous LDAC input. Verify that the required output voltage range (unipolar vs. bipolar) aligns with the available supply rails and ROFS pin configurations.

Part Context

The AD7237AARZ belongs to the enhanced AD7237/AD7247 family, offering improvements such as wider supply voltage tolerance (12 V to 15 V), faster interface times, and better reference stability compared to earlier versions. It is part of the DACPORT series, designed for space-saving monolithic integration. The 'A' designation indicates the industrial temperature grade, while 'RZ' denotes the SOIC package and lead-free/RoHS compliance.

Replacement Considerations

The AD7237ABRZ is a direct replacement with tighter accuracy specifications (±1/2 LSB max relative accuracy) compared to the AD7237AARZ (±1 LSB max). Both share identical pinouts, interfaces, and electrical characteristics except for accuracy grades. Ensure the system design tolerates the specific accuracy requirements before substituting.