AD7247AAR-REEL7

Overview

The AD7247AAR-REEL7 is a dual 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices, packaged in a 24-lead Small Outline Integrated Circuit (SOIC). It integrates two CMOS DACs with on-chip output amplifiers and a Zener voltage reference. The device features a parallel loading structure accepting 12-bit data via separate Chip Select inputs for each channel and a common Write input. It operates from single or dual supplies ranging from +12 V to +15 V (VDD) and 0 V to -15 V (VSS), consuming typically 165 mW in single-supply mode. Static performance includes ±1 LSB relative accuracy and a typical settling time of 5 µs.

Feature Summary

• Dual 12-bit DAC architecture with integrated output amplifiers and internal 5 V reference
• Parallel interface with independent Chip Select inputs for simultaneous or individual channel updates
• Operates from single (+12 V to +15 V) or dual (±12 V to ±15 V) power supplies
• Typical settling time of 5 µs to within ±1/2 LSB

Applications

• Industrial process control systems requiring dual-channel analog output
• Portable instrumentation utilizing single-supply operation
• Microprocessor-based data acquisition and control interfaces

Procurement Notes

Verify the specific suffix 'REEL7' against the manufacturer's current ordering guide to confirm tape-and-reel packaging quantities and RoHS compliance status. Ensure the 'A' grade designation matches the required temperature range of -40°C to +85°C. Cross-reference the pinout configuration for the SOIC-24 package to ensure compatibility with existing board layouts.

Selection Notes

Select the AD7247A variant over the AD7237A when a direct 12-bit parallel interface is preferred, as the AD7247A utilizes an 8+4 bit structure rather than the AD7237A's double-buffered 8-bit bus interface. Confirm that the required output voltage ranges (0-5 V, 0-10 V, or ±5 V) can be achieved using the available ROFS resistor connections. Verify that the supply voltage constraints align with the specified +10.8 V to +16.5 V range for optimal performance.

Part Context

This component belongs to the AD7237A/AD7247A family of LC2MOS Dual 12-Bit DACPORTs. It serves as an enhanced version of the industry-standard AD7237/AD7247, offering improved interface speeds, wider supply voltage operation, and better reference stability. The monolithic CMOS design replaces multi-chip solutions, reducing board space and increasing reliability.

Replacement Considerations

The AD7237A is a functional alternative within the same family but requires a different interface protocol due to its double-buffered 8-bit data structure. Direct pin-for-pin replacement is possible if the system software supports the AD7237A's specific latch addressing sequence.