AD8802ARU

Overview

The AD8802ARU is a 12-channel, 8-bit TrimDAC with power shutdown in a TSSOP-20 package. It provides independent digitally controllable voltage outputs to replace mechanical trimmers. The device operates on a single +3 V to +5 V supply and features a 3-wire SPI compatible serial interface. Static accuracy includes ±1.5 LSB integral nonlinearity and ±1/4 LSB differential nonlinearity. The output resistance is typically 8 kΩ with a settling time of 0.6 μs. Power consumption is low at 10 μA, reducing further in shutdown mode.

Feature Summary

• 12 independent 8-bit DAC channels with individually programmable outputs
• 3-wire SPI compatible serial input for easy microcontroller interfacing
• Power shutdown mode reduces current consumption to <55 mW including IREF
• Midscale preset function via RS pin for simplified initial settings

Applications

• Automatic adjustment and trimmer replacement in circuit designs
• Gain and offset adjustment in video and audio equipment
• Portable and battery-operated equipment requiring low power consumption

Procurement Notes

Verify the specific ordering suffix ARU corresponds to the TSSOP-20 package option RU-20 as listed in the Analog Devices ordering guide. Confirm that the component meets the -40°C to +85°C operating temperature range requirements for the intended application environment before finalizing procurement.

Selection Notes

Select the AD8802ARU when a multi-channel voltage reference adjustment is needed without external potentiometers. Ensure the system logic levels are compatible with the 3-wire serial interface. Consider the 8 kΩ output impedance; buffering may be required if driving low-impedance loads directly from the DAC outputs.

Part Context

The AD8802 is part of the TrimDAC family designed to replace mechanical potentiometers. It shares architectural similarities with the AD8804, which offers separate VREFL control for zero-scale setting. The ARU suffix specifically denotes the surface-mount TSSOP-20 package variant within this product line.

Replacement Considerations

Direct pin-compatible replacements include other AD8802 variants such as AD8802AN (PDIP) or AD8802AR (SOIC). For applications requiring adjustable zero-scale voltage, the AD8804 series serves as a functional alternative with additional VREFL pin access.