AD7304BRUZ

Overview

The AD7304BRUZ is a quad, 8-bit digital-to-analog converter (DAC) from Analog Devices Inc., housed in a 16-lead TSSOP package. It features four independent voltage-output channels with internal precision buffers capable of rail-to-rail swing. The device operates on a single +2.7 V to +5.5 V supply or ±5 V supplies, consuming less than 9 mW at 3 V. It utilizes a 3-wire SPI-compatible serial interface for data input and includes an internal power-on reset that initializes outputs to zero scale. Key performance metrics include ±1 LSB maximum integral and differential nonlinearity, a settling time of 1 µs to ±0.1%, and a reference multiplying bandwidth of 2.6 MHz.

Feature Summary

• Quad 8-bit DAC architecture with individual rail-to-rail buffered outputs per channel
• SPI-compatible 3-wire serial interface (SDI, CLK, CS) with double-buffered input registers
• Internal power-on reset forces all DAC outputs to zero scale upon initialization
• Hardware shutdown capability via SDI/SHDN pin, reducing current to 40 µA

Applications

• Automotive output span voltage control
• Instrumentation systems requiring digitally controlled calibration
• Pin-compatible replacement for AD7226 when operating below 5.5 V

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current guide, as packaging options such as tube or reel configurations may vary. Confirm RoHS compliance status and lead material specifications directly with the supplier documentation prior to procurement. Ensure the selected variant matches the required temperature range and package style for the target application.

Selection Notes

Select the AD7304BRUZ for applications requiring a serial interface; the parallel interface variant is designated as AD7305. This component is suitable for designs needing rail-to-rail output swing with external reference inputs ranging from VSS to VDD. Consider the 16-lead TSSOP package dimensions for PCB layout constraints and ensure adequate thermal management given the specified junction-to-ambient thermal resistance.

Part Context

The AD7304 belongs to the AD7304/AD7305 family of quad 8-bit DACs. While the AD7304 employs a serial interface, its parallel counterpart, the AD7305, uses an 8-bit parallel bus. Both share identical internal DAC structures and electrical characteristics but differ in pin count and interface logic. The BRUZ suffix indicates the industrial temperature range (-40°C to +85°C) and the TSSOP-16 surface-mount package.

Replacement Considerations

The datasheet identifies the AD7304 as a pin-compatible replacement for the AD7226 when the supply voltage is less than 5.5 V. Designers should verify that the legacy system's interface timing and voltage levels are compatible with the AD7304's SPI requirements before substitution.