AD8802ARZ

Overview

The AD8802ARZ is a 12-channel, 8-bit digital-to-analog converter (DAC) from Analog Devices Inc., housed in a 20-lead SOIC package. It operates on a single supply voltage ranging from 2.7 V to 5.5 V and features individually programmable outputs via a 3-wire SPI-compatible serial interface. The device includes a power shutdown mode consuming less than 55 mW while maintaining DAC latch settings. Key static accuracy specifications include a differential nonlinearity error of ±0.25 LSB typical and an integral nonlinearity error of ±0.5 LSB typical. The settling time is typically 600 ns, and the output resistance is approximately 8 kΩ.

Feature Summary

• 12 independent 8-bit DAC channels with individually programmable outputs
• 3-Wire SPI compatible serial input interface for easy microcontroller integration
• Power shutdown mode reduces current consumption to under 55 mW while preserving data
• Midscale preset feature simplifies initial setup conditions upon power-up

Applications

• Automatic adjustment and trimmer replacement in electronic circuits
• Gain and offset adjustment in video and audio equipment
• Geometric correction and automatic adjustment in CRT computer graphic displays
• Portable and battery-operated equipment requiring low power consumption

Procurement Notes

Verify the specific package variant required, as the AD8802 series is available in PDIP-20, SOIC-20, and TSSOP-20 configurations. Confirm that the design utilizes the AD8802 architecture, which lacks a separate VREFL pin compared to the AD8804. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS inputs.

Selection Notes

Select the AD8802ARZ when a compact solution for replacing multiple mechanical potentiometers is needed. The device is suitable for applications where a nominal starting value is desired, leveraging its midscale preset capability. Verify that the system can accommodate the 5 kΩ output impedance or requires external buffering for lower impedance loads.

Part Context

The AD8802ARZ belongs to the TrimDAC family, designed specifically to replace mechanical trimmers in new designs. It shares architectural similarities with the AD8804, though the AD8802 fixes the low-side reference internally to ground, whereas the AD8804 provides a separate VREFL pin for independent zero-scale setting.

Replacement Considerations

The AD8802ARZ-REEL is listed as a parameter-equivalent alternative. Designers should verify pin compatibility and ensure that the absence of the VREFL pin on the AD8802 does not conflict with existing circuit requirements for adjustable zero-scale voltages.