AD8802AR

Overview

The AD8802AR is a 12-channel, 8-bit TrimDAC with power shutdown, manufactured by Analog Devices Inc. It provides independent digitally controllable voltage outputs in a compact 20-lead SOIC package. The device operates on a single +3 V to +5 V supply and features a 3-wire SPI compatible serial interface for easy programming via microcontrollers. Key specifications include an 8-bit resolution, ±1 LSB integral nonlinearity error, and a typical settling time of 0.6 μs. In shutdown mode, the reference input current consumption drops to 10 μA while maintaining DAC latch settings.

Feature Summary

• Replaces 12 mechanical potentiometers with individually programmable digital outputs
• Features a midscale preset function (RS pin) for simplified initial power-up conditions
• Supports low power operation with <55 mW dissipation and a dedicated shutdown mode
• Utilizes a standard 3-wire serial interface (CS, CLK, SDI) for data loading

Applications

• Automatic adjustment and trimmer replacement in electronic circuits
• Gain and offset adjustment for video and audio equipment amplifiers
• Geometric correction and automatic adjustment in CRT computer graphic displays
• Voltage controlled frequencies and bandwidths in video processing systems

Procurement Notes

Verify the specific package variant when ordering, as the 'AR' suffix denotes the SOIC-20 package. Confirm that the application requires the AD8802 architecture (internal GND reference) rather than the AD8804 (separate VREFL pin). Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS inputs.

Selection Notes

Select the AD8802AR when a rail-to-rail output range referenced to ground is sufficient, as it lacks a separate VREFL pin unlike the AD8804. This component is suitable for designs requiring a midscale preset to establish nominal values immediately upon power-up. Verify that the system logic levels are compatible with the specified VIH/VIL thresholds for the chosen supply voltage.

Part Context

The AD8802AR belongs to the AD8802/AD8804 family of 12-channel TrimDACs. While the AD8802 uses an internal ground connection for the lower reference limit, the AD8804 offers a separate VREFL pin for independent zero-scale setting. Both variants share identical digital interfaces, pinouts (except Pin 11), and static accuracy specifications.

Replacement Considerations

Direct functional replacements within the same family include the AD8804AR, provided the circuit does not require the separate VREFL pin functionality. For applications needing a different package, the AD8802AN (PDIP-20) or AD8802ARU (TSSOP-20) offer equivalent electrical performance.