LTC2389ILX-18#PBF

Overview

The LTC2389ILX-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. Typical dynamic performance includes a signal-to-noise ratio (SNR) of 99.8dB in fully differential mode at a 2kHz input frequency. It integrates 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 supporting fully differential, pseudo-differential unipolar, and pseudo-differential bipolar modes without external level translation.
• High-speed 2.5Msps throughput with no pipeline delay or cycle latency in parallel interface modes.
• Integrated precision internal 4.096V voltage reference with guaranteed 0.5% initial accuracy and ±20ppm/°C maximum temperature coefficient.
• Low power consumption of 162.5mW at 2.5Msps, supplemented by nap and sleep power-down modes for inactive periods.

Applications

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

Procurement Notes

Verify the ordering suffix #PBF indicates lead-free finish and tray packaging. Confirm the ILX suffix corresponds to the –40°C to 85°C industrial temperature grade and the 48-lead LQFP package. Ensure compatibility with the DC1826A-A evaluation board for design validation. Check for humidity sensitivity requirements during storage and handling.

Selection Notes

Select this component when 18-bit resolution and 2.5Msps sampling rate are required within a single 5V supply architecture. The ILX variant is suitable for industrial environments operating between –40°C and 85°C. Choose the LQFP package if through-hole or standard surface mount reflow processes are preferred over QFN. Verify that the internal reference accuracy meets system requirements before opting for external references.

Part Context

This part belongs to the LTC2389-18 family of high-speed SAR ADCs. The ILX designation specifically identifies the industrial temperature grade version housed in a 48-lead 7mm × 7mm plastic LQFP package. Other variants include the CLX for commercial temperature ranges and the HLX for extended industrial ranges up to 125°C.

Replacement Considerations

Direct pin-compatible replacements within the same package and temperature grade include other members of the LTC2389 series such as the LTC2389CLX-18#PBF for commercial applications. Cross-family substitution requires verification of pinout compatibility with the LTC238x-16 series.