AD5781BRUZ-REEL7

Overview

The AD5781BRUZ-REEL7 is a single-channel, true 18-bit unbuffered voltage output digital-to-analog converter (DAC) manufactured by Analog Devices. It operates from a bipolar supply range of up to ±16.5 V and features a maximum integral nonlinearity (INL) of ±0.5 LSB and differential nonlinearity (DNL) of ±0.5 LSB, ensuring monotonic operation. The device supports a 3-wire serial interface with clock rates up to 35 MHz, compatible with SPI, QSPI, MICROWIRE, and DSP standards. Key electrical parameters include a 1 µs settling time, 7.5 nV/√Hz noise spectral density, and an operating temperature range from −40°C to +125°C.

Feature Summary

• True 18-bit resolution with ±0.5 LSB INL and DNL for high precision.
• Wide bipolar power supply range supporting up to ±16.5 V.
• Versatile 3-wire serial interface compatible with standard protocols up to 35 MHz.
• Integrated power-on reset circuit ensures 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 B version accuracy specifications against the datasheet, as they vary based on reference voltage configurations. Confirm that the REEL7 suffix indicates tape-and-reel packaging suitable for automated assembly processes. Ensure compatibility with the required digital logic levels, noting the IOVCC range supports 1.8 V interfaces.

Selection Notes

Select this component when high absolute accuracy and low drift are critical. The B version offers tighter linearity specs than the A version under specific reference conditions. Consider the external amplifier requirements for buffering the unbuffered output if driving low-impedance loads. Verify that the system can accommodate the wide analog supply voltage range up to ±16.5 V.

Part Context

This part belongs to the AD5781 family of ultralow noise, high-speed DACs. It is designed for applications requiring precise voltage generation without internal buffering. Complementary devices in the ecosystem include the AD8675 and AD8676 op amps, which are often used as reference buffers or output amplifiers to maximize performance.

Replacement Considerations

The AD5781ARUZ is a pin-compatible alternative within the same family but may have different linearity specifications depending on the reference voltage setup. Check the specific INL/DNL tables for both parts to ensure the replacement meets the application's accuracy requirements.