AD8522JRU

Overview

The AD8522JRU is a dual 12-bit digital-to-analog converter (DAC) from Analog Devices Inc., housed in a 14-lead SOIC surface-mount package. It operates on a single +5 V supply and features a serial digital interface with daisy-chain capability via the SDO pin. The device integrates a laser-trimmed 2.5 V bandgap reference and buffered voltage outputs capable of driving ±5 mA loads. Key electrical specifications include a typical settling time of 16 μs to ±1 LSB, a full-scale output of 4.095 V, and an operating temperature range of –40°C to +85°C.

Feature Summary

• Dual 12-bit resolution with 4.095 V full-scale output (1 mV/LSB)
• Integrated 2.5 V curvature-corrected bandgap reference
• Rail-to-rail buffered voltage outputs with ±5 mA drive capability
• Serial interface supporting hardware-load or software-decode modes

Applications

• Digitally controlled calibration systems
• Servo control loops
• Process control equipment
• Portable instrumentation
• Cellular base station voltage adjustment

Procurement Notes

Verify that the ordering suffix 'JRU' corresponds to the specified 14-lead SOIC package and the industrial temperature range of –40°C to +85°C. Confirm compliance with RoHS standards as indicated by the 'Z' suffix in the standard part number AD8522AR. Ensure the source documentation explicitly validates this specific suffix variant against the official Analog Devices ordering guide.

Selection Notes

Select the AD8522JRU for applications requiring low power consumption (5 mW/DAC) and minimal external components in space-constrained designs. The device is suitable for microcontroller interfaces due to its simple three-wire serial protocol. Consider the 16 μs settling time and ±1.5 LSB relative accuracy when designing for precision analog signal generation.

Part Context

The AD8522 series consists of complete dual 12-bit DACs fabricated in a CBCMOS process. While the datasheet lists the AD8522AR for the SOIC-14 package, the AD8522JRU represents a specific commercial or industrial variant within this family. The component eliminates the need for external references or buffers, offering a cost-effective solution for single-supply systems.

Replacement Considerations

The AD8522AR is the documented equivalent for the 14-lead SOIC package. Verify if the 'J' suffix indicates a specific temperature grade or manufacturing lot difference compared to the standard 'A' suffix before substitution.

FAQ

How does the AD8522 handle data loading?

It supports two modes: hardware-load, where external LDA/LDB pins trigger updates, and software-decode, where the internal logic uses address bits A and B to select the target DAC register.

What is the maximum capacitive load the outputs can drive?

The output amplifiers are characterized to drive up to 500 pF of capacitive load without oscillation.

Can the device operate below +5 V?

Yes, while fully specified for +4.5 V to +5.5 V, operation down to +4.3 V is possible if reduced linearity and source current near full scale are acceptable.