AD7303BRMZ-REEL7

Overview

The AD7303BRMZ-REEL7 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 swing capability via on-chip precision buffer amplifiers. The device utilizes a versatile 3-wire serial interface compatible with QSPI, SPI, Microwire, and DSP standards, supporting clock rates up to 30 MHz. Key specifications include a typical settling time of 1.2 μs, internal or external reference selection, and individual DAC power-down control. The B version ensures operation across an extended temperature range of -40 °C to +105 °C.

Feature Summary

• Dual 8-bit DACs with rail-to-rail output buffering in an 8-pin microSOIC package
• Single-supply operation (+2.7 V to +5.5 V) with low power consumption (typically 2.3 mA at 3.3 V)
• Internal or external reference capability with synchronous update via LDAC function
• Individual power-down for each DAC channel, reducing current to typically 80 nA when fully powered down

Applications

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

Procurement Notes

Verify the ordering suffix REEL7 corresponds to the tape-and-reel packaging format as specified by Analog Devices. Confirm that the BRMZ designation indicates the B-grade temperature range (-40 °C to +105 °C) and the RM-8 microSOIC package. Ensure compatibility with the required serial interface protocol (SPI/QSPI/Microwire) before integration.

Selection Notes

Select this component for applications requiring dual-channel 8-bit resolution with rail-to-rail output swings. The internal reference simplifies design if external precision references are unavailable, though external references offer higher accuracy. Consider the 1.2 μs settling time for bandwidth requirements. Verify that the 3-wire serial interface timing constraints align with the host processor's capabilities.

Part Context

The AD7303 belongs to Analog Devices' family of low-power, single-supply DACs. The BRMZ variant specifically denotes the industrial temperature grade and surface-mount microSOIC packaging. This part is designed for cost-sensitive, space-constrained portable electronics where power efficiency and simple serial interfacing are critical.

Replacement Considerations

Direct pin-compatible replacements within the same package and specification range should be verified against the official Analog Devices replacement guide. Cross-model comparisons must account for differences in settling time, reference architecture, and serial interface compatibility.