The AD5689BCPZ-RL7 is a 16-bit, dual-channel, voltage-output DAC from Analog Devices' nanoDAC+® family, built around a String DAC architecture that guarantees monotonicity. Its ±1 LSB max INL and DNL means every code step lands within one LSB of the ideal transfer function — no missing codes, no differential nonlinearity that would glitch a control loop. The 8 µs settling time to ±1 LSB on a full-scale step sets the update-rate ceiling: at 125 kSPS per channel you get a clean settled output before the next conversion, which suits servo setpoint updates, programmable voltage references, or waveform generation in the audio band.
Supply rails and interface — where it fits the BOM
That split-rail flexibility lets you run the DAC core from a clean 5 V analog rail while the digital interface talks directly to a 3.3 V or 1.8 V MCU without a level shifter. The SPI/DSP-compatible serial interface accepts clock rates up to 50 MHz (per the family datasheet), so the throughput bottleneck is the DAC settling, not the bus. An external reference is required — the reference input range tracks the analog supply, so a 2.5 V or 4.096 V reference like the ADR4525 or ADR4540 is a natural pairing for a 0-to-Vref output swing.
For dual-sourcing flexibility, the pin-compatible AD5689RARUZ-RL7 adds an integrated 2.5 V reference (2 ppm/°C typical) and slightly relaxed INL of ±2 LSB max — a trade worth evaluating if you want to eliminate the external reference BOM line.