LTC2328HMS-18#TRPBF

Analog To Digital Converters (ADC) Overview

The LTC2328HMS-18#TRPBF is an 18-bit successive approximation register (SAR) analog-to-digital converter in a 16-lead MSOP package. It operates from a single 5V supply with a true bipolar input range of ±10.24V, achieving 95dB SNR and ±5LSB maximum INL. The device features a 1Msps sampling rate with no pipeline delay or cycle latency. It includes an onboard 2.048V temperature-compensated reference and a single-shot capable reference buffer. Power consumption is 50mW at full speed, scaling down to 300μW in sleep mode.

Analog To Digital Converters (ADC) Feature Summary

• 18-bit resolution with guaranteed no missing codes and ±5LSB maximum INL
• 1Msps throughput with internal oscillator and zero cycle latency
• True bipolar pseudo-differential inputs supporting ±6.25V, ±10.24V, and ±12.5V ranges
• Onboard 2.048V reference with low drift (20ppm/°C max) and single-shot reference buffer
• SPI-compatible serial interface supporting 1.8V to 5V logic levels with daisy-chain capability

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 H-grade suffix indicates operation from -40°C to +125°C. Confirm the #TRPBF suffix denotes tape and reel packaging for automated assembly. Ensure OVDD supply voltage matches the host digital interface requirements between 1.71V and 5.25V.

Analog To Digital Converters (ADC) Selection Notes

Select this component for high-speed applications requiring wide dynamic range and true bipolar input handling without external level shifting. The internal reference simplifies design but may require overdriving with an external precision reference for lower drift specifications. Consider the 45pF input capacitance and acquisition time when designing the analog front-end driver circuit.

Analog To Digital Converters (ADC) Part Context

This part belongs to the LTC2328 family of SAR ADCs. The HMS-18 designation specifies the 18-bit resolution variant housed in a 16-lead MSOP package with extended industrial temperature range capabilities. It shares architectural similarities with the 16-bit LTC2328-16 but offers higher resolution and slightly different linearity specifications.

Analog To Digital Converters (ADC) Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pin compatibility and electrical parameters against existing designs if considering alternative manufacturers.

Analog To Digital Converters (ADC) FAQ

How does the LTC2328-18 handle bipolar input signals?

The device uses pseudo-differential inputs where IN+ accepts the signal and IN– serves as analog ground sense. An internal resistor divider network attenuates and level-shifts the ±2.5 • VREFBUF input swing to the ADC core's 0-VREFBUF range.

What is the power consumption during inactive periods?

The device features a nap mode that reduces power dissipation proportionally with the sampling rate. Additionally, a sleep mode is provided to reduce power consumption to 300μW during inactive periods.

Can the internal reference be disabled?

Yes, the internal reference buffer can be disabled by grounding the REFIN pin. This allows the REFBUF pin to be overdriven by an external reference voltage in the range of 2.5V to 5V.