AD7303BN

Overview

The AD7303BN 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 16-bit serial input register compatible with SPI, QSPI, Microwire, and DSP standards, supporting clock rates up to 30 MHz. Key specifications include ±1 LSB relative accuracy, internal or external reference capability, and individual DAC power-down modes reducing current consumption to typically 80 nA. It is housed in an 8-pin PDIP package.

Feature Summary

• Dual 8-bit DACs with rail-to-rail voltage outputs and 1.2 μs settling time
• Versatile 3-wire serial interface compatible with SPI, QSPI, Microwire, and DSP
• Internal or external reference selection via control register
• Individual power-down for each DAC with full power-down current < 1 μA

Applications

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

Procurement Notes

Verify the 'N-8' package designation corresponds to the Plastic DIP format required for the specific application. Confirm that the B version temperature range (-40 °C to +105 °C) meets operational environmental requirements. Ensure ESD precautions are implemented during handling due to device sensitivity.

Selection Notes

Select this component when dual-channel 8-bit resolution with high-speed serial interfacing is required. The internal reference simplifies design by eliminating external reference components, though external references offer higher precision. Consider the 30 MHz clock limit and 16-bit word structure for microcontroller timing constraints.

Part Context

The AD7303BN belongs to the AD7303 series of dual 8-bit DACs. The 'BN' suffix specifically denotes the -40 °C to +105 °C operating temperature range and the N-8 (Plastic DIP) package option. Other variants include BR (SOIC) and BRM (microSOIC) packages within the same electrical specification family.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.