AD7244JR-REEL

Overview

The AD7244JR-REEL is a dual, complete 14-bit voltage output digital-to-analog converter (DAC) manufactured by Analog Devices Inc. It integrates two independent DAC channels, each featuring an on-chip 3 V buried Zener reference and buffered output amplifiers. The device utilizes a high-speed serial interface for data input, minimizing pin count while supporting direct interfacing with DSP processors and microcontrollers. Operating from ±5 V supplies, it provides a bipolar analog output range of ±3 V. Key performance metrics include a settling time of 4 µs to ±1/2 LSB and low power consumption of typically 130 mW. The component is fabricated in LC2MOS technology and is specified for operation over the commercial temperature range of 0°C to +70°C.

Feature Summary

• Dual 14-bit resolution with integrated 3 V reference and buffered voltage outputs
• High-speed serial interface compatible with standard DSP and microcontroller protocols
• Fast settling time of 4 µs maximum to within ±1/2 LSB
• Low power dissipation of typically 130 mW at ±5 V supply

Applications

• Industrial process control systems requiring precise voltage generation
• Portable instrumentation utilizing battery-powered single-supply or split-rail configurations
• Data acquisition systems interfacing with microprocessors via serial buses
• Programmable gain amplifier biasing and waveform generation circuits

Procurement Notes

Verify the specific suffix 'JR' indicates the plastic SOIC package variant with the 0°C to +70°C operating temperature range. Confirm that the '-REEL' designation corresponds to tape-and-reel packaging suitable for automated surface-mount assembly. Ensure compatibility with existing board layouts regarding the 28-pin SOIC footprint and verify that the serial interface timing meets the system clock requirements.

Selection Notes

Select the AD7244 when 14-bit resolution is required for both channels, as opposed to the AD7242 which offers 12-bit resolution. This component is appropriate for applications needing independent asynchronous updating of two DAC outputs via separate LDAC inputs. Consider the internal 3 V reference if external precision references are not available; otherwise, utilize the REF IN pins for external sources. Ensure the design accommodates the ±5 V supply requirement and the specific serial protocol timing constraints defined in the datasheet.

Part Context

The AD7244 belongs to the AD7242/AD7244 family of LC2MOS dual DACs. It shares the same pinout and interface logic as the 12-bit AD7242, allowing for easy upgrade paths in hardware designs. The 'JR' suffix denotes the plastic small outline package (SOIC), while the 'A' version extends the temperature range to -40°C to +85°C. This part represents a mature technology solution for cost-sensitive, space-constrained dual-channel conversion tasks.

Replacement Considerations

The AD7242 serves as a lower-resolution alternative within the same package and pinout. For higher resolution needs, consider the AD7847 series. Verify that any substitute maintains the ±5 V supply requirement and serial interface compatibility.