AD8803AR

Overview

The AD8803AR is an octal 8-bit TrimDAC featuring eight individually programmable voltage outputs. It operates on a single +3 V to +5 V supply with a typical supply current of 5 μA. The device utilizes a three-wire serial interface (SPI compatible) for data input, requiring an 11-bit word comprising three address bits and eight data bits. Key static accuracy specifications include an integral nonlinearity error of ±1/2 LSB typical and differential nonlinearity of ±1/4 LSB typical. The output settling time is 0.6 μs. A dedicated VREFL pin allows independent zero-scale voltage setting, distinct from the midscale preset found in the AD8801 variant.

Feature Summary

• Eight digitally controlled DC voltage outputs replacing mechanical trimmers
• Three-wire serial interface compatible with standard microcontrollers
• Separate VREFH and VREFL pins for independent full-scale and zero-scale range setting
• Power shutdown mode reduces current consumption to ≤25 mW while maintaining latch settings

Applications

• Trimmer potentiometer replacement in new designs
• Video and audio equipment gain and offset adjustment
• Portable and battery-operated equipment due to low power consumption
• Automatic adjustment systems and CRT geometric correction

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current catalog, as availability may vary by region. Confirm that the SO-16 package option matches the design requirements. Check for end-of-life notifications or discontinuation notices prior to finalizing procurement plans.

Selection Notes

Select the AD8803AR over the AD8801 when independent control of the zero-scale voltage via the VREFL pin is required. Ensure the external reference voltage connected to VREFH and VREFL remains within the 0 V to VDD range. Verify that the serial interface timing parameters meet the microcontroller's clock speed capabilities.

Part Context

The AD8803AR belongs to the AD8801/AD8803 family of octal 8-bit TrimDACs manufactured by Analog Devices. It shares the same core architecture and serial interface as the AD8801 but differs in having an accessible VREFL pin for flexible output range configuration. The component is designed to replace multiple mechanical potentiometers in precision analog circuits.

Replacement Considerations

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