LTC2688IUJ-16#TRPBF

Overview

The LTC2688IUJ-16#TRPBF is a 16-channel, 16-bit digital-to-analog converter (DAC) from Analog Devices. It features independently programmable SoftSpan output ranges of 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V, and ±15 V. The device includes an integrated precision 4.096 V reference with a maximum temperature coefficient of ±5 ppm/°C. Built-in rail-to-rail output buffers can source or sink up to 20 mA per channel. Key specifications include a maximum integral nonlinearity (INL) error of ±3 LSB for the 16-bit version, a settling time of 3.5 µs for a ±5 V step, and a serial peripheral interface (SPI) compatible clock rate up to 50 MHz. It operates on a single analog supply voltage (VCC) of 4.75 V to 5.25 V.

Feature Summary

• 16 independent channels with full 16-bit resolution across all five SoftSpan output ranges
• Integrated precision 4.096 V internal reference with ±5 ppm/°C maximum temperature coefficient
• Rail-to-rail output buffers capable of driving ±20 mA guaranteed load current
• Supports asynchronous toggle and sinusoidal dither operations via three multifunctional pins

Applications

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

Procurement Notes

Verify that the #TRPBF suffix indicates tape-and-reel packaging suitable for automated surface-mount assembly. Confirm the 'I' grade designation corresponds to the -40°C to +85°C operating temperature range required for the specific application environment. Ensure the LFCSP-40 package footprint matches the PCB layout guidelines provided in the datasheet.

Selection Notes

Select this component when high channel density and flexible bipolar/unipolar voltage ranges are required. The 16-bit resolution and ±3 LSB INL make it suitable for precision applications. Consider the ±20 mA drive capability for direct interfacing with low-impedance loads without external amplifiers. Verify that the 50 MHz SPI interface speed meets the system's data throughput requirements.

Part Context

This part belongs to the LTC2688 family of SoftSpan DACs, which also offers 12-bit resolution variants and different package options such as the 64-ball WLCSP. The 'I' suffix denotes the industrial temperature grade, while the 'UJ' code specifies the 6 mm × 6 mm 40-lead LFCSP package. The '#TRPBF' suffix confirms lead-free construction and tape-and-reel shipping format.

Replacement Considerations

Direct pin-compatible replacements within the same series include the LTC2688-12 variants for lower resolution needs or other temperature grades like the LTC2688HUJ-16#TRPBF for extended temperature operation. Cross-family comparisons should account for differences in channel count, resolution, and package dimensions.