AD5666BRUZ-1

Overview

The AD5666BRUZ-1 is a low-power, quad, 16-bit buffered voltage-output digital-to-analog converter (DAC) from Analog Devices. It operates on a single 2.7 V to 5.5 V supply and features an internal 1.25 V reference with 5 ppm/°C temperature coefficient, yielding a 2.5 V full-scale output range. The device guarantees monotonicity by design and includes a power-on reset circuit for zero-scale or midscale initialization. It supports serial interfaces up to 50 MHz and offers rail-to-rail output swing with programmable power-down modes consuming as low as 200 nA at 3 V.

Feature Summary

• Quad 16-bit resolution with 95 kS/s update rate
• Internal 1.25 V reference providing 2.5 V full-scale output
• 3-wire serial interface compatible with SPI, QSPI, Microwire, and DSP standards
• Power-down current of 400 nA at 5 V and 200 nA at 3 V

Applications

• Process control systems
• Data acquisition systems
• Portable battery-powered instruments
• Digital gain and offset adjustment circuits
• Programmable voltage and current sources

Procurement Notes

Verify the specific suffix '1' in the part number AD5666BRUZ-1 to confirm the inclusion of the 1.25 V internal reference. Confirm the package type is TSSOP-14 and the industrial temperature range (-40°C to +105°C). Check for RoHS compliance status and ensure the ordering quantity matches the available packaging format.

Selection Notes

Select the AD5666BRUZ-1 when a 2.5 V full-scale output range is required without external references. Choose this variant over the AD5666BRUZ-2 if the system does not require a 5 V span. Ensure the application utilizes a single 2.7 V to 5.5 V supply. Verify that the 16-bit resolution and 6 μs settling time meet the system's accuracy and speed requirements.

Part Context

The AD5666BRUZ-1 belongs to the AD5666 family of quad DACs. The '-1' suffix specifically denotes the version with an internal 1.25 V reference, resulting in a 2.5 V output span. Other variants include the AD5666BRUZ-2 with a 2.5 V internal reference for 5 V spans. The device shares common interface logic and pinout across the family but differs in reference configuration.

Replacement Considerations

Direct replacements within the same family include the AD5666ARUZ-1REEL7 (reel packaging) or AD5666BRUZ-1 (tube packaging). For applications requiring a 5 V span, the AD5666BRUZ-2 is the functional equivalent with a different reference. Cross-family replacements like the AD5668 offer octal channels but differ in pin count and channel count.

FAQ

What is the full-scale output voltage of the AD5666BRUZ-1?

The AD5666BRUZ-1 has an internal 1.25 V reference with an internal gain of 2, resulting in a full-scale output voltage of 2.5 V.

How does the power-on reset function work?

The device incorporates a power-on reset circuit that ensures the DAC outputs power up to 0 V if the POR pin is tied low, or to midscale if the POR pin is tied high. This state is maintained until a valid write operation occurs.

Is the AD5666 guaranteed to be monotonic?

Yes, the AD5666 is guaranteed monotonic by design, ensuring that the output increases or decreases monotonically with an increase or decrease in the digital input code.