AD7303BRZ

Overview

The AD7303BRZ is a dual, 8-bit voltage output digital-to-analog converter (DAC) from Analog Devices. It operates on a single +2.7 V to +5.5 V supply and features rail-to-rail output capability with an internal reference or external reference input. The device utilizes a versatile 3-wire serial interface compatible with SPI, QSPI, Microwire, and DSP standards, supporting clock rates up to 30 MHz. Key specifications include a typical settling time of 1.2 μs, low power consumption of 2.3 mA at 3.3 V, and individual DAC power-down functions that reduce current to typically 80 nA in full power-down mode.

Feature Summary

• Dual 8-bit DACs with rail-to-rail output swing and on-chip precision output buffers
• Versatile 3-wire serial interface compatible with SPI, QSPI, Microwire, and DSP standards
• Internal or external reference capability with REF pin for decoupling
• Individual DAC power-down function reducing current to typically 80 nA

Applications

• Portable battery-powered instruments
• Digital gain and offset adjustment circuits
• Programmable voltage and current sources
• Programmable attenuators

Procurement Notes

Verify the package type matches the required application, as the AD7303 series includes DIP, SOIC, and microSOIC options. Confirm the temperature range specification aligns with operational requirements, noting the B version covers -40°C to +105°C. Ensure compatibility with the host system's serial interface timing constraints, particularly regarding the 30 MHz maximum clock rate and SYNC signal setup times.

Selection Notes

Select the AD7303BRZ when a dual-channel, low-power, 8-bit DAC is needed for single-supply applications. Consider the internal reference for simplified designs or external references for higher precision needs. Evaluate the power-down features if energy efficiency is critical for portable devices. Verify that the 8-bit resolution and 1.2 μs settling time meet the system's performance requirements.

Part Context

The AD7303 is part of Analog Devices' line of low-power, serial-input DACs. It is designed for applications requiring multiple channels in a compact package. The BRZ suffix indicates a lead-free, RoHS-compliant SOIC-8 package variant within the broader AD7303 family, which also includes DIP and microSOIC packages.

Replacement Considerations

Direct replacements should maintain dual 8-bit resolution, serial interface compatibility, and similar power supply ranges. Check for equivalent settling times and power-down characteristics. Verify package dimensions and pinout compatibility if substituting in existing PCB layouts.