AD5721BRUZ-RL7

Overview

The AD5721BRUZ-RL7 is a single-channel, 12-bit serial input voltage output digital-to-analog converter (DAC) from Analog Devices. It operates on single supplies of +4.75 V to +30 V or dual supplies ranging from −16.5 V to 0 V for VSS and +4.75 V to +16.5 V for VDD. The device features an integrated output amplifier and reference buffer, supporting software-programmable output ranges including unipolar (0 V to +5 V, +10 V, +16 V, +20 V) and bipolar (±3 V, ±5 V, ±10 V, −2.5 V to +7.5 V). Key electrical specifications include a typical settling time of 7.5 μs, low noise of 35 nV/√Hz, and a total unadjusted error (TUE) of 0.1% FSR maximum. It utilizes a 50 MHz SPI-compatible interface.

Feature Summary

• 12-bit resolution with guaranteed monotonicity (±1 LSB max DNL) and integral nonlinearity (INL) of ±0.5 LSB (B Grade).
• 8 software-programmable output ranges: 0 V to +5 V, +10 V, +16 V, +20 V, ±3 V, ±5 V, ±10 V, and −2.5 V to +7.5 V.
• Integrated output amplifier and reference buffer; supports external reference voltages between 2 V and 3 V.
• Serial interface compatible with DSP/microcontrollers, operating at clock rates up to 50 MHz with double buffering for asynchronous updates.

Applications

• Industrial automation systems
• Instrumentation and data acquisition
• Open-loop and closed-loop servo control
• Process control applications
• Programmable logic controllers

Procurement Notes

Verify the specific grade (B Grade) and package type (16-lead TSSOP) against project requirements. Confirm that the design accommodates an external reference voltage source, as this variant lacks an internal reference. Ensure power supply rails align with the specified operational limits for the selected output range.

Selection Notes

Select the AD5721BRUZ-RL7 when a 12-bit resolution is sufficient and an external precision voltage reference is available. This part requires an external VREFIN source (2 V to 3 V), unlike the AD5721R series which includes an internal reference. Verify that the system can provide the required analog supply voltages (up to +30 V single or ±16.5 V dual) to support the full range of programmable output spans.

Part Context

The AD5721BRUZ-RL7 belongs to the AD5761/AD5721 family of multi-range DACs. It shares pin compatibility and functional architecture with the 16-bit AD5761 but offers 12-bit resolution. The 'RL7' suffix indicates tape and reel packaging. It is distinct from the AD5721R series, which integrates an internal reference, whereas the AD5721B requires an external reference for optimal performance.

Replacement Considerations

The AD5721BCPZ-RL7 serves as a pin-compatible alternative in a 16-lead LFCSP package. For applications requiring an internal reference, the AD5721RBRUZ-RL7 is the corresponding 12-bit variant with integrated reference capabilities. Both alternatives maintain the same serial interface and core functionality.