AD8522AN

Overview

The AD8522AN is a dual 12-bit, single-supply voltage output digital-to-analog converter (DAC) fabricated in a CBCMOS process. It operates on a +5 V supply and features a serial digital interface with a 16-bit word structure containing 12-bit data and address bits. The device includes an onboard 2.5 V bandgap reference and buffered rail-to-rail voltage outputs capable of driving ±5 mA loads. Key electrical specifications include a full-scale output of 4.095 V, a typical settling time of 16 μs to ±1 LSB, and low power consumption of 5 mW per DAC channel.

Feature Summary

• Dual 12-bit resolution with laser-trimmed accuracy and 1 mV/LSB step size
• Integrated 2.5 V curvature-corrected bandgap reference with external availability
• Serial interface supporting hardware-load or software-decode modes via CS, CLK, SDI, LDA, and LDB pins
• Rail-to-rail output amplifiers providing ±5 mA drive current and up to 500 pF capacitive load capability

Applications

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

Procurement Notes

Verify the package option matches the required form factor; the AD8522AN specifically denotes the 14-pin plastic DIP (N-14) variant. Confirm the temperature range is -40°C to +85°C for this suffix. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS input structures. Check for RoHS compliance status if environmental regulations apply to the assembly process.

Selection Notes

Select the AD8522AR variant if a surface-mount SO-14 package is preferred over the through-hole DIP. Consider the 16 μs settling time when designing for high-speed update requirements. Verify that the logic levels of the controlling microcontroller are compatible with the specified VIH and VIL thresholds. Ensure the application does not require heavy loading on the VREF pin without an external buffer amplifier.

Part Context

The AD8522 is part of Analog Devices' complete dual DAC family designed for +5 V single-supply applications. It utilizes a voltage-switched R-2R ladder architecture combined with precision output amplifiers. The device integrates all necessary components for standalone operation, eliminating the need for external references or buffers in standard configurations.

Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation.