AD7237ABRZ-REEL

Overview

The AD7237ABRZ is a dual 12-bit voltage-output digital-to-analog converter (DAC) from the DACPORT family, manufactured by Analog Devices. It integrates two independent 12-bit CMOS DACs with on-chip output amplifiers and a Zener voltage reference on a single monolithic LC2MOS chip. The device supports parallel data interfaces, featuring an 8+4 bit loading structure for the AD7237 variant. It operates with supply voltages ranging from +10.8 V to +16.5 V for VDD and -10.8 V to -16.5 V for VSS. Key electrical parameters include a settling time of 8 µs to within ±1/2 LSB, a relative accuracy of ±1/2 LSB for the B grade, and differential nonlinearity of ±0.9 LSB max. The component is housed in a 24-lead Small Outline Integrated Circuit (SOIC) package.

Feature Summary

• Dual 12-bit architecture with integrated buffered voltage outputs and internal 5 V reference.
• Parallel interface with asynchronous LDAC signal for simultaneous update of both channels.
• Configurable output ranges: 0 V to +5 V, 0 V to +10 V (unipolar), and ±5 V (bipolar).
• LC2MOS fabrication process combining precision bipolar circuits with low-power CMOS logic.

Applications

• Microprocessor-based data acquisition systems requiring dual-channel analog output.
• Industrial control loops utilizing 8-bit or 16-bit bus architectures.
• Portable instrumentation powered by single or dual supply rails.

Procurement Notes

Verify the specific suffix 'BRZ' corresponds to the SOIC-24 package and lead-free compliance status as defined in the manufacturer's ordering guide. Confirm that the 'B' grade designation meets the required ±1/2 LSB relative accuracy specification for the target application environment. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS input structures.

Selection Notes

Select the AD7237ABRZ when an 8-bit microprocessor interface is preferred over the 12-bit direct load structure of the AD7247A. Choose this part if simultaneous updating of multiple channels via a common LDAC line is required. Verify that the power supply range of ±10.8 V to ±16.5 V aligns with the system design, noting that the 0 V to +10 V unipolar range requires VDD ≥ 14.25 V.

Part Context

The AD7237ABRZ is an enhanced version of the industry-standard AD7237/AD7247 series. Improvements include operation from 12 V to 15 V supplies, faster interface times with a typical 30 ns data setup time, and better reference variations with VDD. It replaces older variants such as the AD7237ABR, which has been discontinued.

Replacement Considerations

The AD7237ABR is a direct replacement for the discontinued AD7237ABR, offering identical pinout and functionality with updated manufacturing processes. For applications requiring a 12-bit parallel interface without double buffering, the AD7247ABRZ serves as a functional alternative within the same family.