LTC2327CMS-18#PBF

Analog To Digital Converters (ADC) Overview

The LTC2327CMS-18#PBF is an 18-bit successive approximation register (SAR) analog-to-digital converter with pseudo-differential inputs. It operates from a single 5V supply and supports true bipolar input ranges of ±6.25V, ±10.24V, or ±12.5V. The device achieves a maximum integral nonlinearity (INL) of ±5 LSBs with no missing codes at 18 bits. Typical performance includes 95dB SNR and –111dB THD at a 2kHz input frequency. It features a 500ksps throughput rate with no pipeline delay or cycle latency.

Analog To Digital Converters (ADC) Feature Summary

• 18-bit resolution with guaranteed no missing codes and ±5LSB maximum INL
• True bipolar input ranges: ±6.25V, ±10.24V, or ±12.5V
• Internal 2.048V reference with low drift (20ppm/°C max) and onboard reference buffer
• SPI-compatible serial interface supporting 1.8V to 5V logic levels

Analog To Digital Converters (ADC) Applications

• Programmable Logic Controllers
• Industrial Process Control
• High Speed Data Acquisition
• Portable or Compact Instrumentation
• Automated Test Equipment (ATE)

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific temperature grade suffix when ordering. The #PBF designation indicates a lead-free finish in a tube package. Confirm that the required operating temperature range matches the selected grade (C for commercial, I for industrial, H for extended). Ensure the host system provides the necessary 5V analog supply and compatible digital I/O voltage.

Analog To Digital Converters (ADC) Selection Notes

Select this component for applications requiring high accuracy and wide dynamic range without external references. The internal reference buffer allows direct connection of external references up to 5V for improved performance. Consider the power consumption scaling with sampling rate; nap mode reduces dissipation between conversions. Verify that the input signal source impedance is low enough to meet settling requirements within the acquisition time.

Analog To Digital Converters (ADC) Part Context

This part belongs to the LTC2327-18 family of 18-bit SAR ADCs. The CMS-18 suffix identifies the commercial temperature grade variant housed in a 16-lead MSOP package. Other variants include the IMS-18 for industrial temperatures and the HMS-18 for extended temperatures up to 125°C. All variants share identical electrical specifications and pinouts.

Analog To Digital Converters (ADC) Replacement Considerations

Direct replacements within the same package and specification profile are limited to other temperature grades of the LTC2327-18 series. Cross-family replacements require verification of pin compatibility and interface timing. No alternative part numbers are explicitly documented as direct substitutes in the provided datasheet.