LTC2688CUJ-16#PBF

Overview

The LTC2688CUJ-16#PBF is a 16-channel, 16-bit voltage output SoftSpan DAC in a 40-lead LFCSP package. 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 an integrated precision 4.096 V reference with ±5 ppm/°C drift. Key electrical parameters include ±3 LSB maximum INL, ±1 LSB DNL, and rail-to-rail output buffers capable of sourcing or sinking up to 20 mA. It operates on analog supplies from 4.75 V to 5.25 V (VCC) and digital I/O logic from 1.71 V to VCC.

Feature Summary

• 16 independent channels with individually programmable spans up to ±15 V
• Integrated 4.096 V precision reference with ±5 ppm/°C temperature coefficient
• Rail-to-rail output buffers supporting ±20 mA drive current
• Built-in analog multiplexer for monitoring output voltage, load current, and junction temperature

Applications

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

Procurement Notes

Verify the specific suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the 'C' grade designation matches the required operating temperature range of 0°C to +70°C. Ensure the LFCSP-40 package footprint aligns with the PCB layout design specifications before finalizing procurement orders.

Selection Notes

Select this component when high channel density and wide dynamic range are required. The ±15 V capability accommodates standard industrial signal levels without external amplification. Verify that the system power supply can support the maximum current consumption of approximately 37 mA per VCC at full bipolar ranges. Consider the internal multiplexer feature if board space for external monitoring circuits is limited.

Part Context

This part belongs to the LTC2688 family of SoftSpan DACs. The CUJ suffix identifies the commercial temperature grade (0°C to +70°C) and the 40-lead LFCSP package. Other variants in the series include the -12 resolution option and higher temperature grades (-I for -40°C to +85°C). The WLCSP package variant offers a smaller footprint but shares identical electrical characteristics.

Replacement Considerations

Direct pin-compatible replacements within the same package include other LTC2688 variants such as the LTC2688I or LTC2688H for extended temperature ranges. For lower channel counts, the LTC2686 (8-channel) or LTC2684 (4-channel) may be suitable if channel density requirements allow.