LTC2686CUJ-16#TRPBF

Overview

The LTC2686CUJ-16#TRPBF is an 8-channel, 16-bit voltage output SoftSpan DAC from Analog Devices. It features independently programmable output ranges of 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V, and ±15 V. The device includes a precision internal 4.096 V reference with ±10 ppm/°C drift and rail-to-rail output buffers capable of sourcing or sinking up to 55 mA. It supports SPI and MICROWIRE-compatible 3-wire serial interfaces operating at clock rates up to 50 MHz. Key specifications include ±3 LSB maximum INL error, monotonicity across all ranges, and an analog multiplexer for monitoring output voltages, load currents, and junction temperature.

Feature Summary

• Eight independent channels with full 16-bit resolution and five selectable output ranges (±15 V max).
• Integrated precision 4.096 V reference with ±10 ppm/°C maximum temperature coefficient.
• Rail-to-rail output buffers guaranteeing ±55 mA drive current capability.
• Built-in analog multiplexer for monitoring pin voltages, load currents, and junction temperature.

Applications

• Optical networking systems
• Precision instrumentation
• Data acquisition systems
• Automatic test equipment
• Process control and industrial automation

Procurement Notes

Verify the CUJ suffix indicates the commercial temperature grade (0°C to 70°C) and the #TRPBF suffix denotes tape-and-reel packaging. Confirm that the specific lot requires ESD precautions due to the LFCSP package sensitivity. Ensure supply voltages match the specified limits: VCC between 4.75 V and 5.25 V, and IOVCC between 1.71 V and VCC + 0.3 V.

Selection Notes

Select this model over the -12 variant if 16-bit resolution is required, noting the higher INL specification of ±3 LSB compared to ±0.75 LSB for the 12-bit version. Choose the CUJ package for commercial temperature applications; use the IUJ package for extended industrial temperatures (-40°C to +85°C). Ensure the system design accommodates the dual positive supply requirement (V1+, V2+) when using bipolar output ranges.

Part Context

This component belongs to the LTC2686 SoftSpan DAC family, which provides flexible single- or dual-supply operation. The device is designed to replace manual potentiometer adjustments in calibration and control loops. It integrates offset and gain adjustment registers to improve output accuracy without external components. The family also includes variants with different resolutions and package options like WLCSP.

Replacement Considerations

Direct pin-compatible replacements within the same series include the LTC2686IUJ-16#PBF for industrial temperature range or the LTC2686HUJ-16#PBF for high-temperature applications. For lower resolution needs, the LTC2686-12 variants offer tighter linearity specs but fewer bits. Verify that any substitute maintains the 55 mA output drive capability and SPI compatibility.