AD7801BRZ

Overview

The AD7801BRZ is a single-channel, 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 an on-chip precision output buffer capable of rail-to-rail swing. The device utilizes a parallel microprocessor-compatible interface with double-buffered logic for high-speed data loading. Reference selection can be configured via an internal VDD-derived source or an external input at the REFIN pin. Key electrical parameters include a maximum relative accuracy of ±1 LSB, a typical settling time of 1.2 μs, and a power consumption of less than 5 mW at 3.3 V.

Feature Summary

• Single 8-bit resolution with ±1 LSB max relative accuracy and guaranteed monotonicity.
• On-chip output buffer providing rail-to-rail operation with a typical settling time of 1.2 μs.
• Flexible reference configuration supporting both internal VDD/2 generation and external inputs (1 V to VDD/2).
• Low power architecture consuming <1 μA in power-down mode and <5 mW during active operation.

Applications

• Portable battery-powered instruments requiring low current consumption.
• Programmable voltage and current sources utilizing the buffered output stage.
• Digital gain and offset adjustment circuits in signal processing chains.
• Programmable attenuators and digitally controlled indicator systems.

Procurement Notes

Verify the package option when ordering; the 'R' suffix denotes the 20-lead Small Outline (SOIC) package specified by the model AD7801BRZ. Confirm that the required operating temperature range aligns with the B version specifications (-40°C to +105°C). Ensure proper ESD precautions are observed during handling as the device is electrostatic sensitive. Cross-reference the specific revision level if timing constraints are critical for the target system design.

Selection Notes

Select the AD7801BRZ for applications requiring an 8-bit resolution DAC with a parallel interface and rail-to-rail output capability. This component is suitable where power consumption must remain below 5 mW at 3.3 V. Consider the external reference requirement if higher precision than the internal VDD/2 source is needed, noting the REFIN input range limits. Verify that the 20-lead SOIC footprint fits the PCB layout constraints compared to the TSSOP alternative.

Part Context

The AD7801 belongs to the Analog Devices family of single-supply DACs designed for portable electronics. It shares architectural similarities with other parts in the series but is distinct in its 8-bit resolution and parallel interface configuration. The BRZ variant specifically identifies the commercial temperature grade and lead-free RoHS-compliant packaging within the broader AD7801 product line.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should evaluate other Analog Devices 8-bit DACs with parallel interfaces for potential compatibility, ensuring pinout and electrical specifications match the existing circuit requirements.