AD7244JRZ

Overview

The AD7244JRZ is a dual, complete, 14-bit voltage output digital-to-analog converter (DAC) fabricated in Linear Compatible CMOS (LC2MOS). It integrates two DAC channels, a 3 V buried Zener reference, output buffer amplifiers, and high-speed serial interface logic. The device operates from ±5 V supplies, providing an analog output range of ±3 V. Key electrical parameters include a settling time of 4 μs to ±1/2 LSB, integral nonlinearity of ±2 LSB max, and typical power dissipation of 130 mW. It supports independent asynchronous control via separate LDAC inputs for each channel.

Feature Summary

• Dual 14-bit resolution with on-chip 3 V buried Zener voltage reference
• Fast settling time of 4 μs max to ±1/2 LSB
• High-speed serial interface with independent data paths for each DAC
• Buffered analog outputs capable of driving ±3 V across 2 kΩ loads

Applications

• Interfacing with DSP processors and microcontrollers requiring serial control
• Precision instrumentation systems utilizing bipolar voltage outputs
• Multi-channel signal generation where independent channel updating is required

Procurement Notes

Verify the specific suffix 'JRZ' corresponds to the SOIC-28 plastic package and the J temperature grade (0°C to +70°C) as defined in the ordering guide. Confirm that the application environment remains within this operating range, as other grades such as A or S offer different thermal specifications. Ensure supply voltages are strictly maintained at ±5 V ±5% for specified performance.

Selection Notes

Select the AD7244JRZ when 14-bit resolution is required rather than the 12-bit AD7242 variant. The part is suitable for designs needing a compact 28-pin SOIC footprint compared to the 24-pin DIP options. Consider the internal reference capability if system noise budgets allow for the standard decoupling scheme; otherwise, external references can be applied to REF INA/B for improved isolation.

Part Context

The AD7244 is part of the AD7242/AD7244 family, sharing identical pinouts to facilitate upgrades from 12-bit to 14-bit performance. The 'J' designation indicates the commercial temperature range, while 'R' denotes the Small Outline IC package type. This component utilizes LC2MOS technology to combine precision bipolar circuits with low-power CMOS logic.

Replacement Considerations

The AD7242JRZ serves as a direct pin-compatible alternative offering 12-bit resolution instead of 14-bit. Other variants in the series include AD7244JN (Plastic DIP) and AD7244AQ (Cerdip), which share the same functional architecture but differ in package style and potentially tighter linearity specifications.