LTC1861LIMS#PBF

Analog To Digital Converters (ADC) Overview

The LTC1861LIMS#PBF is a 12-bit, 150ksps successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices. It operates on a single 3V supply with a typical supply current of 450μA at maximum sampling rate, dropping to 10μA in auto-shutdown mode. The device features a software-selectable 2-channel multiplexer and an external reference pin in the MSOP-8 package. It utilizes a 3-wire serial interface compatible with SPI/MICROWIRE standards. Key electrical specifications include a signal-to-noise ratio of 72 dB, full power bandwidth of 10 MHz, and integral nonlinearity of ±1 LSB.

Analog To Digital Converters (ADC) Feature Summary

• 12-Bit Resolution with 150ksps Sampling Rate
• Software-Selectable 2-Channel Multiplexer
• Single 3V Supply Operation with Auto Shutdown
• SPI/MICROWIRE Compatible Serial I/O

Analog To Digital Converters (ADC) Applications

• High Speed Data Acquisition
• Portable or Compact Instrumentation
• Low Power Battery-Operated Instrumentation
• Isolated and/or Remote Data Acquisition

Analog To Digital Converters (ADC) Procurement Notes

Verify the ordering suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the IMS8 suffix corresponds to the 8-lead plastic MSOP package variant. Ensure the specific temperature grade matches application requirements, as standard industrial grades are available. Cross-reference the manufacturer part number with authorized distributors to ensure authenticity and traceability.

Analog To Digital Converters (ADC) Selection Notes

Select the LTC1861L over the LTC1860L when a 2-channel input multiplexer is required for multi-point sensing applications. The MSOP package is suitable for space-constrained designs compared to the SO-8 option. Ensure the external reference voltage range supports the desired input span, as the MSOP version allows external VREF adjustment from 1V to VCC. Verify that the source impedance is low enough to settle within the sampling window without additional buffering.

Analog To Digital Converters (ADC) Part Context

This component belongs to the LTC1860L/LTC1861L family of μPower ADCs designed for compact, low-power systems. It serves as a high-speed upgrade to older 12-bit devices like the LTC1285/LTC1288 while maintaining pin compatibility with the 16-bit LTC1864L/LTC1865L series. The L-series variants specifically optimize performance for single 3V supply operation.

Analog To Digital Converters (ADC) Replacement Considerations

Pin-compatible replacements include the LTC1860L for single-channel applications and the LTC1864L/LTC1865L for 16-bit resolution upgrades. Direct substitutes may require verification of supply voltage compatibility and reference configuration differences between packages.