AD5686ARUZ

Overview

The AD5686ARUZ is a quad, 16-bit buffered voltage output digital-to-analog converter (DAC) from the nanoDAC+ family. It features an external reference input and operates on a single 2.7 V to 5.5 V supply. The device provides four rail-to-rail buffered outputs with a user-selectable gain of 1 or 2 via the GAIN pin, enabling full-scale spans of 0 V to VREF or 0 V to 2 × VREF. It includes a versatile SPI interface supporting clock rates up to 50 MHz with readback capabilities. Key performance metrics include ±2 LSB maximum integral nonlinearity (INL), ±0.1% FSR total unadjusted error, and low power consumption of 1.8 mW at 3 V.

Feature Summary

• Quad 16-bit resolution with ±2 LSB maximum INL and guaranteed monotonicity by design.
• External reference input with selectable gain (×1 or ×2) for flexible output voltage ranges.
• High-speed 50 MHz SPI interface with daisy-chain and readback support via SDO pin.
• Low power operation: 1.8 mW typical at 3 V; per-channel power-down reduces current to 4 µA.

Applications

• Programmable attenuators
• Digital gain and offset adjustment circuits
• Process control I/O cards and PLCs
• Industrial automation systems

Procurement Notes

Verify the specific grade (A or B) required for your application, as specifications such as INL and offset error vary between grades. Confirm that the TSSOP-16 package matches your PCB footprint. Ensure the system design accommodates an external voltage reference, as this variant does not include an internal one. Check compatibility with the host controller's SPI logic levels using the VLOGIC pin.

Selection Notes

Select the AD5686ARUZ when high accuracy (16-bit) and multiple channels are needed without the cost of an integrated reference. Compare against the AD5686R if an internal 2.5 V reference is preferred. Consider the AD5684 if 12-bit resolution is sufficient for lower cost. Ensure the external reference voltage meets the input range requirements defined in the specifications table for the chosen gain setting.

Part Context

The AD5686ARUZ belongs to the nanoDAC+ series, which integrates DACs with output amplifiers in small packages. It shares the same core architecture and pinout as the AD5684 (12-bit) and AD5686R (internal reference). The 'A' suffix typically denotes a specific accuracy grade within the product line, while 'RUZ' indicates the 16-lead TSSOP package with lead-free solder finish.

Replacement Considerations

The AD5686BRUZ is a direct pin-compatible alternative with potentially different accuracy grades (B Grade). For applications requiring an internal reference, the AD5686RBRUZ is functionally similar but includes an on-chip 2.5 V reference. The AD5684ARUZ offers 12-bit resolution in the same package if higher precision is not required.