AD7237JR-REEL

Overview

The AD7237JR-REEL is a dual 12-bit voltage-output digital-to-analog converter (DAC) from the DACPORT family, fabricated in LC2MOS technology. It integrates two independent DAC channels with on-chip output amplifiers and a Zener voltage reference. The device features an 8-bit parallel loading structure for the AD7237A variant, utilizing address lines A0/A1 and Chip Select (CS) inputs to manage data latches. It operates on single or dual supplies ranging from +10.8 V to +16.5 V for VDD. Key performance metrics include a typical settling time of 8 µs to within ±1/2 LSB, a resolution of 12 bits, and a maximum relative accuracy of ±1 LSB for the industrial temperature grade.

Feature Summary

• Dual 12-bit architecture with integrated buffered voltage outputs and internal 5 V reference.
• Parallel interface optimized for 8-bit microprocessors using double-buffered input latches (MSB/LSB).
• Flexible supply operation: Single supply (+12 V to +15 V) or dual supplies (±12 V to ±15 V).
• Configurable output ranges including 0–5 V, 0–10 V (unipolar), and ±5 V (bipolar).

Applications

• Industrial process control systems requiring multi-channel analog output.
• Microprocessor-based instrumentation with 8-bit data buses.
• Portable battery-powered equipment due to low power consumption profiles.

Procurement Notes

Verify the specific suffix 'JR' against the manufacturer's ordering guide, as standard listings typically utilize 'AN', 'ABN', 'AR', or 'ABR' designators for DIP/SOIC packages. Confirm that the reel packaging aligns with the required quantity per reel specifications for the SOIC-24 variant. Ensure ESD precautions are observed during handling, as the device is sensitive to electrostatic discharge.

Selection Notes

Select this component when interfacing with 8-bit microprocessors requiring a double-buffered parallel interface. Choose the AD7237A variant over the AD7247A if asynchronous LDAC updating is required for simultaneous channel synchronization. Verify that the required output voltage range (unipolar vs. bipolar) matches the available R_OFS resistor configurations and supply rail capabilities.

Part Context

The AD7237 series represents an enhanced version of industry-standard DACs, offering improved interface speeds and wider supply voltage tolerance compared to predecessors. It belongs to the DACPORT family, which consolidates multiple functions onto a single CMOS chip to reduce board space and increase reliability. The 'J' designation typically indicates a military or extended temperature grade in some Analog Devices nomenclatures, though verification against the specific datasheet ordering guide is required.

Replacement Considerations

Direct replacements include the AD7237ABRZ (SOIC package, industrial temp) or AD7237ABN (DIP package, industrial temp). For extended temperature ranges, consider the AD7237ATQ. Ensure pin compatibility and interface logic differences between the AD7237A (8-bit bus) and AD7247A (12-bit bus) variants are addressed if substituting with related models.