LTC2688CUJ-16#TRPBF

Overview

The LTC2688CUJ-16#TRPBF is a 16-channel, 16-bit voltage output SoftSpan digital-to-analog converter (DAC) manufactured by Analog Devices Inc. It features an integrated precision 4.096 V reference with ±5 ppm/°C drift and independently programmable output ranges of 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V, or ±15 V. The device guarantees monotonicity and includes rail-to-rail output buffers capable of sourcing or sinking up to 20 mA. It supports SPI and MICROWIRE-compatible serial interfaces operating at clock rates up to 50 MHz with logic levels as low as 1.71 V. The component is housed in a 6 mm × 6 mm, 40-lead LFCSP package.

Feature Summary

• 16 independent channels with full 16-bit resolution across all five programmable output ranges.
• Integrated precision 4.096 V reference with maximum temperature coefficient of ±5 ppm/°C.
• Built-in analog multiplexer for monitoring output voltages, load currents, and junction temperature.
• Supports asynchronous toggle and sinusoidal dither operations via three multifunctional TGP pins.

Applications

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

Procurement Notes

Verify the #TRPBF suffix indicates tape-and-reel packaging distinct from tube variants. Confirm the 'C' grade designation corresponds to the 0°C to +70°C operating range. Ensure the LFCSP-40 footprint matches the PCB layout requirements. Validate that the internal reference mode meets system accuracy needs without external components.

Selection Notes

Select this model for applications requiring high channel density and wide dynamic output ranges. The internal reference simplifies design but limits flexibility compared to external reference modes. Consider thermal resistance values when designing for the ±15 V range, as power dissipation increases with higher supply voltages. Verify IOVCC compatibility with the host controller's logic levels.

Part Context

This part belongs to the LTC2688 family of SoftSpan DACs, which also includes 12-bit variants and different package options such as the 64-ball WLCSP. The CUJ-16 designation specifies the commercial temperature grade and 16-bit resolution within the 40-lead LFCSP form factor. Other family members may share functional blocks but differ in resolution, package type, or temperature specifications.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate other LTC2688 variants based on required resolution (12-bit vs. 16-bit), package type (LFCSP vs. WLCSP), and operating temperature range (Commercial vs. Industrial).