AD7303BNZ

Overview

The AD7303BNZ 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 buffers with a typical settling time of 1.2 μs. The device utilizes a 3-wire serial interface compatible with SPI, QSPI, Microwire, and DSP standards, supporting clock rates up to 30 MHz. It includes an internal reference or accepts external references between 1 V and VDD/2. Power consumption is typically 2.3 mA at 3.3 V, reducing to less than 1 μA in full power-down mode. The component is housed in an 8-pin PDIP package.

Feature Summary

• Dual 8-bit DACs with rail-to-rail buffered outputs
• 3-wire serial interface compatible with SPI, QSPI, Microwire, and DSP
• Internal or external reference capability (1 V to VDD/2)
• Individual DAC power-down control with low current consumption

Applications

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

Procurement Notes

Verify the specific ordering suffix 'N' corresponds to the 8-pin plastic DIP package as defined in the manufacturer's ordering guide. Confirm that the B version temperature range (-40 °C to +105 °C) meets the operational requirements for the intended environment. Ensure compatibility with the host system's serial interface timing constraints.

Selection Notes

Select this component when a dual-channel, low-power DAC with rail-to-rail output is required. The internal reference simplifies design by eliminating external reference components, though external references are supported for higher precision. The 8-bit resolution and 1.2 μs settling time suit applications where moderate speed and accuracy are sufficient. Verify that the load capacitance does not exceed 100 pF to maintain stability.

Part Context

The AD7303 belongs to the AD7303 family of dual 8-bit DACs. The 'BNZ' designation indicates the B grade temperature range (-40 °C to +105 °C), the N package style (8-pin Plastic DIP), and RoHS compliance. Other variants include the BR (SOIC-8) and BRM (microSOIC-8) packages within the same electrical specification family.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pinout and electrical parameter compatibility if considering alternative dual 8-bit DACs from other manufacturers.