AD5687RBRUZ

Overview

The AD5687RBRUZ is a dual, 12-bit buffered voltage output digital-to-analog converter (DAC) from the nanoDAC+ family. It features an internal 2.5 V reference with a typical temperature coefficient of 2 ppm/°C and operates on a single 2.7 V to 5.5 V supply. The device supports a user-selectable gain of 1 or 2 via the GAIN pin, providing full-scale outputs of 2.5 V or 5 V respectively. It utilizes a versatile SPI interface operating at clock rates up to 50 MHz and includes a VLOGIC pin for logic compatibility ranging from 1.62 V to 5.5 V.

Feature Summary

• 12-bit resolution with ±1 LSB maximum relative accuracy (INL).
• Integrated low-drift 2.5 V internal reference (2 ppm/°C typical).
• Dual-channel architecture with per-channel power-down reducing current to 4 μA at 3 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
• Data acquisition systems

Procurement Notes

Verify the specific package variant against the datasheet ordering guide. The BRUZ suffix indicates a 16-lead TSSOP package. Confirm that the required grade (A or B) matches the application's linearity specifications, as performance parameters such as INL vary between grades.

Selection Notes

Select this component when a dual-channel, 12-bit DAC with high precision is required. Ensure the system requires a 2.7 V to 5.5 V analog supply and 1.62 V to 5.5 V logic supply. Verify that the 50 MHz SPI speed and 7 µs settling time meet the system's update rate requirements.

Part Context

This part belongs to the AD5689R/AD5687R nanoDAC+ family. It shares the same physical footprint and functional block diagram as the 16-bit AD5689R but offers 12-bit resolution. Both devices utilize the same TSSOP and LFCSP packages and share identical pinouts and interface protocols.

Replacement Considerations

The AD5687RBRUZ-RL7 is the reel version of this component. For external reference applications, the AD5687 is available without the 'R' suffix. Cross-model replacement with the AD5689R is possible if higher resolution is acceptable.

FAQ

What is the maximum capacitive load stability?

The device is stable with up to 2 nF of capacitive load when the resistive load is infinite, and up to 10 nF when the resistive load is 1 kΩ.

How does the GAIN pin affect the output range?

Tying the GAIN pin to GND sets the gain to 1, resulting in a 0 V to VREF output span. Tying it to VLOGIC sets the gain to 2, resulting in a 0 V to 2 × VREF output span.

What is the function of the RSTSEL pin?

The RSTSEL pin determines the DAC output state upon power-up. Connecting it to GND powers up the DACs to zero scale, while connecting it to VLOGIC powers them up to midscale.