AD7809BST-REEL

Overview

The AD7809BST-REEL is an octal 10-bit digital-to-analog converter (DAC) manufactured by Analog Devices Inc. It features parallel load capabilities and operates from a +3.3 V to +5 V power supply with an on-chip reference. The device incorporates double-buffered data inputs for simultaneous analog output updates via the asynchronous LDAC input. Key electrical parameters include a maximum settling time of 4 ms, a typical current consumption of 12 mA in normal mode, and a maximum power dissipation of 99 mW. It supports both two's complement and offset binary input coding schemes.

Feature Summary

• Octal configuration providing eight independent 10-bit DAC channels within a single package.
• Parallel loading interface utilizing CS, WR, and address pins for direct data bus connectivity.
• Integrated system and channel control registers enabling individual or global power-down and standby modes.
• On-chip Sub-DAC allows shifting the transfer function around the VBIAS point for precise calibration.

Applications

• Optical disk drives requiring multi-channel signal generation.
• Process control systems for voltage setpoint adjustments.
• Instrumentation and communication equipment needing programmable bias levels.
• Automatic calibration circuits replacing trim potentiometers.

Procurement Notes

Verify the specific suffix 'BST' corresponds to the 44-Lead Thin Plastic Quad Flatpack (TQFP) package and commercial temperature range (-40°C to +85°C). Confirm that the '-REEL' designation indicates tape-and-reel packaging rather than tube packaging. Ensure compatibility with existing PCB footprints for the SU-44 package type before ordering.

Selection Notes

Select this component when multiple low-resolution analog outputs are required in a space-constrained design. The parallel interface is suitable for microcontrollers or FPGAs with sufficient GPIO lines. Consider the 4 ms settling time for application speed requirements. Verify that the internal 1.23 V reference meets accuracy needs or if external REFIN is necessary for higher precision.

Part Context

This part belongs to the AD780x family of quad and octal DACs. The AD7809 specifically denotes the octal variant with parallel loading, distinguishing it from the serial-loaded AD7808. It shares architectural similarities with the AD7804 and AD7805 but scales the channel count to eight. The BST suffix identifies the TQFP surface-mount package option within this product line.

Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation.