LTC2389IUK-18#PBF

Overview

The LTC2389IUK-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. Key dynamic performance metrics include a typical signal-to-noise ratio (SNR) of 99.8dB in fully differential mode and total harmonic distortion (THD) of –116dB at a 2kHz input frequency. Power consumption is 162.5mW at full speed.

Feature Summary

• 18-Bit Resolution with No Missing Codes
• 2.5Msps Throughput Rate
• Pin-Configurable Analog Input Ranges
• Internal Precision Reference

Applications

• Medical Imaging
• High Speed Data Acquisition
• Industrial Process Control
• Instrumentation
• Automated Test Equipment

Procurement Notes

Verify the package type matches the required form factor, as the IUK suffix denotes a 48-lead QFN package. Confirm the temperature grade corresponds to the application environment; the 'I' suffix specifies an operating range of –40°C to 85°C. Ensure the '#PBF' designation is present for lead-free compliance and tube packaging. Cross-reference the specific part number against the manufacturer's current datasheet to confirm active status and any potential design changes.

Selection Notes

Select this component when high accuracy and moderate speed are required without external reference circuitry. The internal 4.096V reference simplifies board layout but requires verification against system noise requirements. Choose between parallel or serial interfaces based on the host processor's available pins and clock capabilities. Consider the power-down modes if energy efficiency during idle periods is critical for the system design.

Part Context

This part belongs to the LTC2389 family of SAR ADCs, which offers pin-compatible options in various resolutions and packages. The IUK variant specifically provides the industrial temperature range in a compact QFN footprint. It serves as a direct replacement for older precision ADCs requiring similar throughput and linearity specifications while offering integrated reference and buffer capabilities.

Replacement Considerations

The LTC2389IUK-18#TRPBF is the tape-and-reel equivalent of this tube-packaged part. For wider temperature ranges, the LTC2389HLX-18#PBF (H-grade, –40°C to 125°C, LQFP package) is available. Pin-compatible alternatives within the same family include the 16-bit versions, though resolution differs.