AD8803ARZ

Overview

The AD8803ARZ is an octal 8-bit TrimDAC featuring a power shutdown mode, manufactured by Analog Devices Inc. It provides eight individually programmable DC voltage outputs controlled via a standard three-wire serial interface. The device operates on a single +3 V to +5 V supply and consumes only 5 μA in normal operation. A key distinction of the AD8803 is its separate VREFL pin, which allows independent setting of the zero-scale voltage, optimizing resolution for limited control ranges. It replaces mechanical trimmer potentiometers in applications requiring precise gain and offset adjustments.

Feature Summary

• Octal 8-bit resolution with eight individually programmable DAC outputs
• Separate VREFL pin for independent zero-scale voltage setting
• Power shutdown mode reduces consumption to ≤ 25 mW while maintaining latch settings
• Standard three-wire serial input (SPI compatible) for microcontroller interfacing

Applications

• Automatic adjustment circuits
• Trimmer potentiometer replacement
• Video and audio equipment gain and offset adjustment
• Portable and battery-operated equipment

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package integrity upon receipt, as the SO-16 variant is ESD sensitive. Check manufacturing date codes against current lifecycle status, as older batches may be subject to obsolescence notices. Ensure proper handling procedures are followed during storage and assembly to prevent electrostatic discharge damage.

Selection Notes

Select the AD8803ARZ when independent control of both full-scale (VREFH) and zero-scale (VREFL) voltages is required to maximize resolution within a specific voltage window. Choose this part over the AD8801 if the application demands a non-ground-referenced zero-scale output. Ensure the system logic levels are compatible with the 3V/5V operating range and that the serial interface timing meets the specified setup and hold requirements.

Part Context

The AD8803ARZ belongs to the AD8801/AD8803 family of octal digital-to-analog converters. The 'AR' suffix indicates the SO-16 surface-mount package option, while 'Z' denotes RoHS compliance. It shares the same functional block diagram and serial interface protocol as the AD8801, differing primarily in the availability of the VREFL pin for external reference connection.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.