AD8802ANZ

Overview

The AD8802ANZ is a 12-channel, 8-bit TrimDAC with power shutdown, housed in a 20-lead PDIP 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 for easy microcontroller programming. Key specifications include an 8-bit resolution, ±1 LSB full-scale error, and a typical settling time of 0.6 μs. It consumes only 10 μA from the power supply in normal operation and enters a low-power shutdown mode when the SHDN pin is asserted.

Feature Summary

• 12 Independent Channels: Provides 12 separate 8-bit DAC outputs (O1–O12) with individual programmability.
• Power Shutdown: Reduces current consumption to <10 μA while maintaining DAC latch settings.
• Midscale Preset: Includes an RS pin for asynchronous preset to midscale output setting (80H).
• Single Supply Operation: Functions with a +3 V to +5 V supply and 3-wire serial interface.

Applications

• Automatic Adjustment and Trimmer Replacement
• Video and Audio Equipment Gain and Offset Adjustment
• Portable and Battery Operated Equipment

Procurement Notes

Verify the ordering suffix 'AN' corresponds to the PDIP-20 package and –40°C/+85°C temperature range as specified in the Analog Devices ordering guide. Confirm that the component matches the REV. 0 datasheet specifications for static accuracy and dynamic performance before integration into designs requiring precise DC voltage adjustment.

Selection Notes

Select the AD8802ANZ when a 12-channel digital potentiometer replacement is needed with a midscale preset feature. Ensure the application requires a single-ended reference input (VREFH) tied to GND internally, as opposed to the AD8804 which offers a separate VREFL pin for zero-scale offset. Verify that the 5 kΩ output resistance and 8-bit resolution meet the system's accuracy requirements.

Part Context

The AD8802 is part of the TrimDAC family designed to replace mechanical potentiometers in new designs. It shares the same core architecture and serial interface as the AD8804, differing primarily in the availability of the VREFL pin. The AD8802 is optimized for applications where adjustments start at a nominal value, utilizing its midscale preset capability.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. When replacing mechanical trimmers, ensure the external reference voltage does not exceed the VDD supply voltage. For applications requiring a separate zero-scale voltage setting, consider the AD8804 variant instead.