AD8802ARU-REEL

Overview

The AD8802ARU-REEL is a 12-channel, 8-bit TrimDAC in a TSSOP-20 package. It provides independent digitally controllable voltage outputs for DC adjustment applications. The device operates on a single +3 V to +5 V supply and features a 3-wire SPI compatible serial interface. Key specifications include an 8-bit resolution, <55 mW power shutdown mode, and a midscale preset function activated by the RS pin. It replaces mechanical trimmers with individually programmable outputs.

Feature Summary

• 12 independent 8-bit DAC channels with individual programmability
• 3-Wire SPI compatible serial input interface
• Power shutdown mode consuming less than 55 mW
• Midscale preset feature via RS pin for nominal value initialization

Applications

• Automatic adjustment systems
• Trimmer replacement in circuit designs
• Video and audio equipment gain and offset adjustment
• Portable and battery-operated equipment

Procurement Notes

Verify the ordering suffix 'RU' corresponds to the TSSOP-20 package option as listed in the manufacturer's ordering guide. Confirm the temperature range specification of –40°C to +85°C matches the application requirements. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS inputs.

Selection Notes

Select this component when replacing multiple mechanical potentiometers with digital control is required. The AD8802 variant is suitable for applications where the zero-scale voltage is fixed at ground. Verify that the system logic levels are compatible with the specified VIL and VIH thresholds for the chosen supply voltage.

Part Context

This part belongs to the AD8802/AD8804 family of TrimDACs. The AD8802 differs from the AD8804 by lacking a separate VREFL pin, fixing the lower reference limit internally. The 'ARU' designation indicates the SOIC/TSSOP surface mount package variant, while 'AN' denotes the PDIP through-hole version.

Replacement Considerations

Public confirmed substitute part numbers: AD8804ARU (offers separate VREFL setting).

FAQ

How is the output voltage calculated?

The output voltage is determined by the equation VO(Dx) = (Dx)/256 × (VREFH – VREFL) + VREFL, where Dx is the 8-bit data value.

What is the function of the RS pin?

The RS pin acts as an asynchronous preset to midscale output setting, loading all DAC registers with the value 80H.

How does the power shutdown mode operate?

Asserting the SHDN pin reduces reference input current consumption to 10 μA while maintaining the DAC latch settings for immediate restoration upon return to normal operation.