AD5781ARUZ

Overview

The AD5781ARUZ is a single-channel, true 18-bit unbuffered voltage output digital-to-analog converter (DAC) from Analog Devices. It operates with bipolar analog supplies ranging from ±2.5 V to ±16.5 V and digital supplies of 2.7 V to 5.5 V. The device guarantees monotonic operation with ±0.5 LSB differential nonlinearity (DNL) and offers ±0.5 LSB integral nonlinearity (INL). Key electrical parameters include a 1 µs settling time, 7.5 nV/√Hz noise spectral density, and a 35 MHz Schmitt-triggered serial interface compatible with SPI, QSPI, Microwire, and DSP standards.

Feature Summary

• True 18-bit resolution with ±0.5 LSB INL and guaranteed monotonicity at ±0.5 LSB DNL
• Wide supply range supporting up to ±16.5 V analog rails and 2.7 V to 5.5 V digital logic
• Low noise performance with 7.5 nV/√Hz spectral density and 1.4 nV-sec glitch impulse
• Integrated power-on reset circuit ensuring DAC output powers up to 0 V

Applications

• Medical instrumentation
• Test and measurement equipment
• Industrial control systems
• Scientific and aerospace instrumentation
• Data acquisition systems

Procurement Notes

Verify the specific revision level (Rev. E datasheet) when sourcing components to ensure alignment with timing characteristics and absolute maximum ratings. Confirm that the TSSOP-20 package matches the design footprint requirements. Check for any specific environmental or reliability certifications if the application demands extended operating conditions beyond the standard industrial range.

Selection Notes

Select the AD5781ARUZ for applications requiring high precision and wide dynamic range in a single-channel configuration. Ensure the external reference voltage source can drive the force/sense inputs within the specified ranges (5 V to VDD − 2.5 V for positive, VSS + 2.5 V to 0 V for negative). Consider using an external buffer amplifier if low output impedance is required, as the DAC output is unbuffered.

Part Context

The AD5781 belongs to the AD5781 series of high-performance DACs. Complementary devices listed include the AD8675 and AD8676 operational amplifiers, which are recommended for buffering the voltage reference inputs and the DAC output to maintain linearity and drive loads effectively. Related parts in the portfolio include the 20-bit AD5791.

Replacement Considerations

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