AD5686RBCPZ-RL7

Overview

The AD5686RBCPZ-RL7 is a quad, 16-bit buffered voltage output Digital-to-Analog Converter (DAC) from the nanoDAC+ family. It integrates a 2.5 V internal reference with a typical drift of 2 ppm/°C and operates on a single 2.7 V to 5.5 V supply. The device features a 50 MHz SPI interface with readback capability and supports 1.8 V logic levels via the VLOGIC pin. Key electrical specifications include a maximum Integral Nonlinearity (INL) of ±2 LSB, a total unadjusted error (TUE) of ±0.1% of Full Scale Range (FSR), and an offset error of ±1.5 mV maximum. It provides a high drive capability of 20 mA and consumes only 3.3 mW at 3 V.

Feature Summary

• Quad 16-bit resolution with ±2 LSB maximum INL and guaranteed monotonicity by design.
• Integrated 2.5 V reference with 2 ppm/°C typical temperature coefficient.
• User-selectable gain of 1 or 2 via GAIN pin for full-scale outputs of 2.5 V or 5 V.
• Power-on reset circuit with RSTSEL pin for zero scale or midscale initialization.

Applications

• Optical transceivers
• Base-station power amplifiers
• Process control PLC I/O cards
• Industrial automation systems
• Data acquisition systems

Procurement Notes

Verify the specific suffix BC in the part number against official documentation to confirm package type and reel configuration. Ensure compatibility with the required operating temperature range of -40°C to +105°C. Confirm that the 16-lead LFCSP footprint matches the PCB layout guidelines provided in the datasheet.

Selection Notes

Select this component when a quad-channel DAC with high relative accuracy and low drift is required. The internal 2.5 V reference simplifies design by eliminating external reference components. Consider the 20 mA drive capability for direct load driving without additional amplification. Verify that the 50 MHz SPI speed meets the system's throughput requirements.

Part Context

This part belongs to the AD5686R/AD5685R/AD5684R family, which shares identical pinouts and interfaces but differs in resolution (16-bit, 14-bit, and 12-bit respectively). The AD5686R is the highest-resolution variant in this series, offering 16-bit precision with the same low-power and compact package options as its lower-resolution counterparts.

Replacement Considerations

Direct functional replacements within the same family include the AD5685R (14-bit) and AD5684R (12-bit) if reduced resolution is acceptable. For external reference variants, consider the AD5686, though it lacks the integrated reference. Ensure any substitute maintains the 16-lead LFCSP package for mechanical compatibility.

FAQ

How does the GAIN pin affect the output voltage range?

When tied to GND, the gain is 1, providing an output range of 0 V to VREF (typically 2.5 V). When tied to VLOGIC, the gain is 2, providing an output range of 0 V to 2 × VREF (typically 5 V).

What is the function of the RSTSEL pin during power-up?

The RSTSEL pin determines the initial state of the DAC outputs after power-on reset. Tying it to GND powers up all outputs to zero scale, while tying it to VLOGIC powers them up to midscale.

Can multiple AD5686R devices be connected in a daisy-chain configuration?

Yes, the SDO (Serial Data Output) pin allows multiple devices to be connected in a daisy chain, enabling data transfer across several units using a single serial bus.