AD7801BRUZ

Overview

The AD7801BRUZ is a single-channel, 8-bit voltage-output digital-to-analog converter (DAC) manufactured by Analog Devices Inc. It operates on a single supply voltage ranging from +2.7 V to +5.5 V and features an on-chip precision output buffer that enables rail-to-rail output swing. The device utilizes a parallel microprocessor and DSP-compatible interface with double-buffered logic for synchronous or automatic updates. Key electrical specifications include a maximum settling time of 2 µs, relative accuracy of ±1 LSB, and differential nonlinearity of ±1 LSB. Power consumption is typically 5 mW at 3.3 V, reducing to less than 3 µW in power-down mode.

Feature Summary

• Rail-to-rail voltage output with on-chip buffered amplifier
• Parallel interface compatible with standard microprocessors and DSPs
• Internal reference derived from VDD or external reference input capability
• Power-down mode reduces current consumption to less than 1 µA

Applications

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

Procurement Notes

Verify the package option RU-20 corresponds to the Thin Shrink Small Outline package when sourcing. Confirm the temperature range B version covers -40°C to +105°C. Ensure ESD precautions are observed during handling as the device is electrostatic discharge sensitive. Check datasheet revision for any specific timing parameter updates before finalizing design integration.

Selection Notes

Select the AD7801BRUZ when an 8-bit resolution with rail-to-rail output is required within a low-power budget. The internal reference simplifies design if an external precision reference is not available. Verify that the parallel interface timing requirements align with the host microcontroller or DSP system. Consider the 20-pin TSSOP footprint constraints for PCB layout.

Part Context

The AD7801BRUZ belongs to the AD7801 family of single-channel DACs. It is offered in both 20-lead SOIC (R-20) and 20-lead TSSOP (RU-20) packages. The 'B' suffix indicates the commercial temperature range extension to -40°C to +105°C. This component serves as a cost-effective solution for applications requiring moderate resolution and low power consumption.

Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation.