LTC2389IUK-18

Overview

The LTC2389IUK-18 is an 18-bit, 2.5Msps Successive Approximation Register (SAR) Analog-to-Digital Converter (ADC) manufactured by Analog Devices Inc. It operates from a single 5V supply and features pin-configurable analog input ranges: fully differential (±4.096V), pseudo-differential unipolar (0V to 4.096V), and pseudo-differential bipolar (±2.048V). The device integrates a precision internal voltage reference with 0.5% initial accuracy and ±20ppm/°C temperature coefficient. Key electrical parameters include a typical Signal-to-Noise Ratio (SNR) of 99.8dB at 2kHz input in full differential mode, Total Harmonic Distortion (THD) of -116dB, and a power dissipation of 162.5mW at maximum sampling rate. It is housed in a 48-lead QFN package.

Feature Summary

• 18-bit resolution with 2.5Msps throughput and no missing codes
• Pin-configurable analog inputs supporting differential, unipolar, and bipolar ranges without external level shifting
• Integrated 4.096V precision reference buffer with 0.5% initial accuracy
• Low power consumption of 162.5mW at 2.5Msps with Nap and Sleep modes

Applications

• High-resolution data acquisition systems requiring flexible input configurations
• Industrial process control and instrumentation
• Medical equipment and imaging systems
• Test and measurement instruments

Procurement Notes

Verify the specific suffix '#PBF' for lead-free compliance and RoHS status when ordering. Confirm the package type is the 48-lead QFN (IUK) variant. Check current availability as distribution status may vary by region. Ensure the development kit DC1826A-A is available if hardware evaluation is required during the design phase.

Selection Notes

Select the LTC2389IUK-18 when 18-bit accuracy and 2.5Msps speed are required with a single 5V supply. Choose this model over other LTC2389 variants specifically for its QFN-48 package form factor. Consider the integrated reference and programmable input ranges to simplify external circuitry compared to devices requiring external references or signal conditioning amplifiers.

Part Context

This component belongs to the LTC2389 family of high-speed, low-power SAR ADCs. The 'IUK' designation indicates the industrial temperature range and QFN package. The '-18' suffix specifies the 18-bit resolution version. Related evaluation boards include the DC1826A-A for performance verification.

Replacement Considerations

Direct replacements within the same package and pinout include other LTC2389 variants such as LTC2389ILX-18 (LQFP package) or LTC2389CMS-18 (MS package), provided the footprint allows. Verify that thermal characteristics and pin assignments match exactly before substitution.