LTC2688CUJ-12#TRPBF

Overview

The LTC2688CUJ-12#TRPBF is a 16-channel, 12-bit voltage output SoftSpan digital-to-analog converter (DAC) manufactured by Analog Devices Inc. It features an integrated precision 4.096 V reference with a maximum temperature coefficient of ±5 ppm/°C. The device supports five independently programmable output ranges: 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V, and ±15 V. It operates on a single analog supply voltage (VCC) ranging from 4.75 V to 5.25 V. Key performance metrics include a maximum integral nonlinearity (INL) error of ±0.75 LSB and a settling time of 3.5 μs for a ±5 V step at 0.0015% accuracy. The unit is housed in a 40-lead, 6 mm × 6 mm LFCSP package.

Feature Summary

• 16 independent channels with individually programmable SoftSpan output ranges up to ±15 V
• Integrated precision 4.096 V internal reference with ±5 ppm/°C temperature coefficient
• Built-in rail-to-rail output buffers capable of sourcing or sinking up to 20 mA
• Analog multiplexer for monitoring output voltages, load currents, and junction temperature

Applications

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

Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when reviewing distributor listings. Confirm that the 'C' grade designation aligns with the required operating temperature range of 0°C to 70°C for the intended application environment. Ensure the logic supply voltage (IOVCC) matches the system's digital interface levels, as it supports operation down to 1.71 V.

Selection Notes

Select this component when a high channel count DAC with flexible voltage ranges is required. The 12-bit resolution offers a balance between cost and performance for general-purpose applications. Consider the external reference mode if higher accuracy than the internal ±5 ppm/°C reference is needed. Verify that the PCB layout accommodates the thermal requirements of the LFCSP package, particularly if driving significant load currents near the ±20 mA limit.

Part Context

This part belongs to the LTC2688 family of SoftSpan DACs. The 'CUJ' designation identifies the commercial temperature grade ('C') and the 40-lead LFCSP package ('UJ'). The '#TRPBF' suffix denotes the specific packaging format (tape and reel) and lead-free compliance. Other variants in the series include the 16-bit version (LTC2688-16) and different temperature grades such as Industrial ('I') and Extended ('H').

Replacement Considerations

Direct pin-compatible replacements within the same package are limited to other LTC2688 variants with different resolutions or temperature grades. For functional equivalents with different channel counts or packages, redesign of the schematic and PCB layout will be necessary.