AD7809BSTZ

Overview

The AD7809BSTZ is an octal 10-bit digital-to-analog converter (DAC) from Analog Devices, featuring parallel load capabilities. It integrates eight independent DAC channels within a single package, operating on a +3.3 V to +5 V power supply with an on-chip reference. The device utilizes 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 and a typical current consumption of 12 mA in normal mode. It supports both offset binary and two's complement input coding schemes.

Feature Summary

• Octal configuration providing eight independent 10-bit DAC channels
• Parallel loading interface with double-buffered data registers
• Integrated on-chip bandgap reference (typically 1.23 V)
• Supports individual channel standby and system-wide power-down modes

Applications

• Optical disk drives
• Instrumentation and communication systems
• Process control and voltage setpoint control
• Trim potentiometer replacement
• Automatic calibration

Procurement Notes

Verify the specific suffix 'BSTZ' against the manufacturer's ordering guide to confirm the TQFP-44 package and commercial temperature range (-40°C to +85°C). Ensure compatibility with parallel bus architectures requiring CS, WR, and address lines. Confirm that the internal reference meets system noise requirements or consider external REFIN if lower noise is necessary.

Selection Notes

Select this component when multiple low-resolution analog outputs are required in a compact form factor. The parallel interface suits high-speed microcontroller or FPGA designs where serial clocking overhead is undesirable. Verify that the 10-bit resolution and ±4 LSB accuracy meet application linearity requirements. Check power dissipation limits in the TQFP-44 package if driving significant load currents.

Part Context

The AD7809 belongs to the AD780x family of quad and octal DACs. It is the octal counterpart to the AD7805 (quad parallel) and shares architectural similarities with the serial-loaded AD7808. This family addresses applications needing multiple synchronized analog outputs without external multiplexing.

Replacement Considerations

Public confirmed substitute part numbers: AD7805 (Quad version), AD7808 (Serial Octal version). Pinout differences exist between parallel and serial interfaces; verify register mapping and pin assignments before substitution.