LTC2389CLX-18#PBF

Overview

The LTC2389CLX-18#PBF is an 18-bit, 2.5Msps successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices Inc. It operates from a single 5V supply and features pin-configurable analog input ranges: ±4.096V fully differential, 0V to 4.096V pseudo-differential unipolar, and ±2.048V pseudo-differential bipolar. The device guarantees 18-bit resolution with no missing codes and achieves a maximum integral nonlinearity (INL) of ±3LSB. It includes a precision internal 4.096V reference with ±20ppm/°C temperature coefficient and dissipates 162.5mW at full speed. The component is housed in a 48-lead 7mm × 7mm plastic LQFP package.

Feature Summary

• Pin-configurable analog input ranges supporting fully differential, pseudo-differential unipolar, and pseudo-differential bipolar modes without external level translation.
• High dynamic performance with typical SNR of 99.8dB (fully differential) and THD of –116dB at fIN = 2kHz.
• Integrated precision internal 4.096V voltage reference with guaranteed 0.5% initial accuracy and internal buffer.
• Supports both parallel and serial digital interfaces with 1.8V to 5V I/O voltages and no pipeline delay.

Applications

• Medical imaging systems
• High-speed, wide dynamic range data acquisition
• Industrial process control
• Instrumentation
• Automatic test equipment (ATE)

Procurement Notes

Verify the specific ordering suffix '#PBF' indicates lead-free finish and tray packaging for the CLX grade. Confirm the 'C' suffix corresponds to the commercial temperature range of 0°C to 70°C. Ensure the LQFP package dimensions match the design footprint. Check for RoHS compliance documentation if required by local regulations.

Selection Notes

Select this part when 18-bit resolution and 2.5Msps throughput are required within a single-channel SAR architecture. Choose the CLX variant for commercial temperature applications (0°C to 70°C). Consider the ILX or HLX variants if extended industrial (-40°C to 85°C) or high-temperature (-40°C to 125°C) operation is necessary. Verify that the internal reference accuracy meets system requirements before opting for external references.

Part Context

This component belongs to the LTC2389 family of 18-bit SAR ADCs. The CLX designation specifically identifies the commercial temperature grade packaged in a 48-lead LQFP format. Other variants in the series include the ILX (industrial) and HLX (high-temperature) grades, as well as QFN packages (UK suffix), offering flexibility for different environmental and board space constraints.

Replacement Considerations

Direct pin-compatible replacements within the same package and temperature grade include other LTC2389CLX variants with different input configurations or resolutions, provided they meet the electrical specifications. For extended temperature ranges, the LTC2389ILX-18#PBF or LTC2389HLX-18#PBF may be substituted if thermal conditions allow.