AD7304BR

Overview

The AD7304BR is a quad, 8-bit digital-to-analog converter (DAC) from Analog Devices. It operates from single +3 V to +5 V or ±5 V supplies, consuming less than 9 mW at 3 V. The device features rail-to-rail buffered voltage outputs and an SPI-compatible serial interface. Key specifications include ±1 LSB integral nonlinearity (INL), ±1 LSB differential nonlinearity (DNL), and a settling time of 1 µs to ±0.1% full scale. It includes internal power-on reset and hardware shutdown capabilities.

Feature Summary

• Quad 8-bit DAC architecture with rail-to-rail output buffers
• SPI-compatible 3-wire serial interface (SDI, CLK, CS)
• Internal power-on reset sets outputs to zero scale
• Hardware shutdown mode reduces current to 40 µA

Applications

• Automotive output span voltage control
• Instrumentation digitally controlled calibration
• Pin-compatible replacement for AD7226 when VDD < 5.5 V

Procurement Notes

Verify the specific suffix (e.g., BRUZ vs. BRU) against the required package type (TSSOP-16 vs. SOIC-16) and temperature range (-40°C to +85°C). Confirm RoHS compliance status as it varies by manufacturing lot and region. Ensure the ordering code matches the exact pinout and thermal characteristics needed for the target PCB design.

Selection Notes

Select the AD7304BR over the AD7305 if a serial interface is preferred; the AD7305 uses parallel inputs. Ensure the application requires independent reference inputs per channel, as the AD7304 provides four separate VREF pins unlike the AD7305's single shared reference. Verify that the load capacitance does not exceed 200 pF to prevent oscillation.

Part Context

The AD7304 belongs to the AD7304/AD7305 family of low-power, quad 8-bit DACs. It is functionally identical to the AD7305 except for its serial data interface versus the AD7305's parallel interface. Both share the same R-2R ladder architecture and rail-to-rail output stage, designed for cost-sensitive applications requiring multiple channels in a compact footprint.

Replacement Considerations

The datasheet explicitly identifies the AD7304 as a pin-compatible replacement for the AD7226 when operating with VDD less than 5.5 V. No other direct cross-model replacements are documented in the provided text.