LTC2389HLX-18#PBF

Overview

The LTC2389HLX-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 throughput.

Feature Summary

• Pin-configurable analog input ranges including ±4.096V fully differential, 0V to 4.096V unipolar, and ±2.048V bipolar modes.
• 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.
• Supports both parallel and serial digital interfaces with 1.8V to 5V I/O voltages.

Applications

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

Procurement Notes

Verify the H-grade suffix indicates an extended operating temperature range of –40°C to 125°C. Confirm the LX package designation corresponds to the 48-lead 7mm × 7mm plastic LQFP form factor. Ensure the #PBF suffix denotes lead-free finish compliance. Cross-reference the specific ordering code against official manufacturer documentation to validate availability and exact thermal specifications.

Selection Notes

Select this component for applications requiring high linearity without pipeline latency. The H-grade variant is necessary for environments exceeding 85°C. Verify that the required I/O voltage levels are compatible with the OVDD supply range of 1.71V to 5.25V. Ensure the system can accommodate the 162.5mW power dissipation or utilize nap/sleep modes for lower average power consumption.

Part Context

This part belongs to the LTC2389-18 family of low-noise, high-speed SAR ADCs. The HLX-18#PBF specifically identifies the industrial/high-temperature grade (H), tape and reel or tray packaging variant (LX), and lead-free finish (#PBF). It shares architectural similarities with other LTC238x models but offers specific pin-configurable input flexibility and integrated reference capabilities distinct from external reference designs.

Replacement Considerations

Direct replacements within the same family include LTC2389ILX-18#PBF for commercial/industrial temperature ranges (–40°C to 85°C) and LTC2389CLX-18#PBF for commercial ranges (0°C to 70°C). Ensure the substitute maintains the 48-pin LQFP package and 18-bit resolution requirements.