AD5685RARUZ

Overview

The AD5685RARUZ is a quad, 14-bit buffered voltage output Digital-to-Analog Converter (DAC) from the nanoDAC+ family. It features an internal 2.5 V reference with a typical drift of 2 ppm/°C and operates on a single 2.7 V to 5.5 V supply. The device supports a 50 MHz SPI interface with readback or daisy-chain capabilities and includes a user-selectable gain pin for full-scale outputs of 2.5 V or 5 V. Key electrical parameters include a settling time of 5 µs, ±1 LSB maximum INL, and a glitch impulse of 0.5 nV-sec. It offers per-channel power-down modes reducing current to 4 µA and ensures monotonic operation.

Feature Summary

• Quad 14-bit resolution with ±1 LSB maximum Integral Nonlinearity (INL)
• Integrated 2.5 V reference with 2 ppm/°C typical temperature coefficient
• User-selectable gain (GAIN pin) for 2.5 V or 5 V full-scale output ranges
• 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 package type against the specific suffix; the datasheet lists both LFCSP and TSSOP options for the AD5685R series. Confirm that the required grade (A or B) matches the application's accuracy specifications. Ensure the ordering code corresponds to the desired packaging format, such as tube or reel, as availability varies by distributor.

Selection Notes

Select the AD5685RARUZ when a quad channel configuration with 14-bit precision is required. Choose this part over the AD5686R if lower resolution suffices, or over the AD5684R if higher precision is needed. Verify that the 50 MHz SPI speed and 1.8 V logic compatibility align with the host microcontroller interface requirements.

Part Context

The AD5685RARUZ belongs to the nanoDAC+ family, which also includes the 16-bit AD5686R and 12-bit AD5684R. These devices share identical pinouts, interfaces, and functional blocks, differing primarily in resolution and accuracy grades. This family is designed for low-power, high-accuracy applications requiring integrated references and robust digital interfaces.

Replacement Considerations

The AD5686RARUZ and AD5684RARUZ are pin-compatible alternatives within the same family. For external reference configurations, the non-R variants (AD5685) may be considered, though they lack the internal reference. Ensure any substitute maintains the 14-bit resolution and SPI interface compatibility.