AD7302BRUZ-REEL

Overview

The AD7302BRUZ-REEL is a dual, 8-bit voltage output digital-to-analog converter (DAC) from Analog Devices Inc. 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 parallel microprocessor-compatible interface with double-buffered logic for simultaneous or individual DAC updates. Key specifications include ±1 LSB relative accuracy, internal or external reference capability, and low power consumption of 3 mA max at 3.3 V, reducing to 1 μA in power-down mode. It is housed in a 20-lead TSSOP package.

Feature Summary

• Dual 8-bit DACs with rail-to-rail output buffering
• Parallel interface with double-buffered input and DAC registers
• Internal (VDD/2) or external reference selection via REFIN pin
• Power-down mode reduces current consumption to <1 μA

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 RUZ corresponds to the TSSOP-20 package and REEL packaging format as defined by Analog Devices. Confirm that the B version meets the required -40°C to +105°C operating temperature range for the application environment. Ensure compatibility with the system's parallel data bus timing requirements.

Selection Notes

Select this component when a dual-channel, low-cost 8-bit DAC with high-speed parallel interface is required. The internal reference simplifies design if an external precision reference is not available. Verify that the load capacitance does not exceed 100 pF to maintain the specified 1.2 μs settling time. Consider the power-down feature for battery-operated systems requiring minimal standby current.

Part Context

The AD7302 is part of Analog Devices' family of low-power, single-supply DACs. It is functionally similar to the AD7304 (serial interface) and AD7305 (quad channel), but offers a distinct dual-channel parallel configuration. The BRUZ variant specifically denotes the industrial temperature grade and surface-mount TSSOP packaging.

Replacement Considerations

Direct functional substitutes include the AD7302BN (DIP package) and AD7302BR (SOIC package). For quad-channel applications, the AD7305 series may be considered, though it requires interface adaptation. Cross-model replacements must account for differences in package footprint and interface type (parallel vs. serial).