AD5761BRUZ-RL7

Overview

The AD5761BRUZ-RL7 is a single-channel, 16-bit serial input voltage output digital-to-analog converter (DAC) from Analog Devices Inc. It operates from single supply voltages of +4.75 V to +30 V or dual supplies ranging from −16.5 V to 0 V and +4.75 V to +16.5 V. The device features eight software-programmable output ranges including unipolar and bipolar options with 5% overrange capability. Key electrical specifications include a total unadjusted error (TUE) of 0.1% FSR maximum, integral nonlinearity (INL) of ±2 LSB maximum for B Grade, and a typical settling time of 7.5 μs. It integrates reference buffers and offers low noise performance of 35 nV/√Hz.

Feature Summary

• 16-bit resolution with guaranteed monotonicity (±1 LSB max DNL) and ±2 LSB max INL (B Grade).
• Eight programmable output ranges: 0 V to +5 V, 0 V to +10 V, 0 V to +16 V, 0 V to +20 V, ±3 V, ±5 V, ±10 V, and −2.5 V to +7.5 V.
• Asynchronous updating via LDAC pin and asynchronous RESET to zero scale/midscale/full-scale.
• DSP/microcontroller-compatible serial interface supporting clock rates up to 50 MHz.

Applications

• Industrial automation systems
• Instrumentation and data acquisition equipment
• Open-/closed-loop servo control and process control
• Programmable logic controllers

Procurement Notes

Verify the ordering suffix RL7 indicates reel packaging when sourcing components. Confirm the BRUZ designation corresponds to the B Grade specification and 16-lead LFCSP package. Ensure compatibility with external reference requirements, as specified performance assumes a 2.5 V reference input. Check for RoHS compliance status if required by specific manufacturing standards.

Selection Notes

Select the AD5761 variant for applications requiring 16-bit resolution; the AD5721 provides 12-bit resolution. Choose the B Grade version for tighter INL specifications (±2 LSB) compared to A Grade (±8 LSB). Ensure power supply rails support the desired output range, particularly for bipolar configurations requiring negative supply voltages. Verify that the load impedance meets the stability requirements, typically 1 kΩ resistive and 200 pF capacitive.

Part Context

The AD5761 is part of the AD5761/AD5721 family of single-channel DACs. It is pin-compatible with the AD5761R and AD5721R, which feature internal references. The device is available in 16-lead TSSOP and 16-lead LFCSP packages. It shares functional similarities with other high-precision DACs but distinguishes itself through its wide programmable output range flexibility and integrated reference buffering capabilities.

Replacement Considerations

The AD5761R serves as a direct replacement if an internal reference is preferred, eliminating the need for an external 2.5 V reference source. For lower resolution needs, the AD5721 offers a cost-effective alternative with 12-bit accuracy. Ensure any substitute maintains the same serial interface timing characteristics and package dimensions for board-level compatibility.

FAQ

What is the maximum serial clock frequency for the AD5761?

The serial interface supports clock rates of up to 50 MHz in write mode and 33 MHz in readback mode.

How does the asynchronous RESET function operate?

Asserting the RESET pin returns the device to its default power-on status, clamping the output to ground and powering down the output buffer. It can also be configured to reset to midscale or full-scale code.

What are the power supply requirements for bipolar output ranges?

For bipolar output ranges, the device requires dual supplies where VDD ranges from +4.75 V to +16.5 V and VSS ranges from −16.5 V to 0 V.