AD7237KRZ-REEL

Overview

The AD7237KRZ-REEL is a dual 12-bit voltage-output digital-to-analog converter (DAC) from the DACPORT family, manufactured by Analog Devices Inc. It integrates two CMOS DACs with on-chip voltage reference and output amplifiers on a monolithic LC2MOS chip. The device features an 8-bit parallel loading structure for the AD7237A variant, requiring two write operations per channel. It supports single or dual supply operation within a range of +10.8 V to +16.5 V for VDD and -10.8 V to -16.5 V for VSS. Key performance metrics include a typical settling time of 8 µs to ±1/2 LSB, a maximum relative accuracy of ±1/2 LSB for the B grade, and a power dissipation of approximately 165 mW in single-supply mode.

Feature Summary

• Dual 12-bit DAC architecture with integrated 5 V Zener reference and buffered output amplifiers
• Parallel interface with double-buffered input latches (8+4 bit structure) and asynchronous LDAC update
• Configurable output ranges: 0 V to +5 V, 0 V to +10 V (unipolar), and ±5 V (bipolar)
• LC2MOS process technology ensuring low power consumption and high reliability

Applications

• Microprocessor-based data acquisition systems
• Programmable gain amplifiers and variable voltage sources
• Waveform generation and signal processing circuits
• Industrial control systems requiring precise analog output

Procurement Notes

Verify the specific suffix 'KRZ-REEL' against the manufacturer's ordering guide to confirm package type (SOIC) and reel packaging configuration. Ensure compatibility with existing PCB footprints for the 24-lead SOIC package. Check for moisture sensitivity level (MSL 3) requirements during storage and handling. Confirm that the 'B' grade accuracy specifications meet the system design tolerances.

Selection Notes

Select the AD7237A variant over the AD7247A if interfacing with microprocessors having an 8-bit data bus, as it utilizes a double-buffered interface. Choose the 'B' grade version for tighter linearity specifications (±1/2 LSB max) compared to the 'A' grade (±1 LSB max). Ensure the application requires the specific 8-bit parallel loading structure; otherwise, consider the AD7247A for direct 12-bit parallel loading. Verify power supply constraints align with the ±12 V to ±15 V operational range.

Part Context

The AD7237KRZ-REEL belongs to the enhanced AD7237A/AD7247A series, which improves upon the industry-standard AD7237/AD7247 with faster interface times and wider supply voltage operation. It is part of the DACPORT family, designed to replace multi-chip solutions with a single-chip implementation. The 'K' indicates the SOIC package, 'R' denotes tape and reel packaging, and 'Z' signifies RoHS compliance.

Replacement Considerations

Direct replacements include other variants within the AD7237A/AD7247A family, such as AD7237ABRZ or AD7237AARZ, depending on required accuracy and packaging. For applications requiring 12-bit parallel loading without the double-buffered structure, the AD7247A series may be considered, though pinout and logic differences exist.