LTC2351CUH-14#PBF

Analog To Digital Converters (ADC) Overview

The LTC2351CUH-14#PBF is a 14-bit, 1.5Msps simultaneous sampling analog-to-digital converter (ADC) featuring six differential input channels. It operates from a single 3V supply, drawing 5.5mA in active mode and reducing power to 12μW in sleep shutdown. The device utilizes a successive approximation register (SAR) architecture with an internal 2.5V bandgap reference. Key performance metrics include a Signal-to-Noise Plus Distortion Ratio (SINAD) of 75dB at 100kHz, a Spurious Free Dynamic Range (SFDR) of 90dB, and Total Harmonic Distortion (THD) of -90dB. It supports unipolar (0V to 2.5V) or bipolar (±1.25V) input ranges and communicates via a 3-wire SPI-compatible serial interface.

Analog To Digital Converters (ADC) Feature Summary

• Six simultaneously sampled differential inputs with 250ksps throughput per channel
• Low power consumption: 16.5mW active, 4.5mW nap, and 12μW sleep modes
• 83dB common mode rejection ratio (CMRR) for noise elimination
• Internal 2.5V reference with external reference overdrive capability

Analog To Digital Converters (ADC) Applications

• Multiphase power measurement
• Multiphase motor control
• Data acquisition systems
• Uninterruptable power supplies

Analog To Digital Converters (ADC) Procurement Notes

Verify the operating temperature range corresponds to the 'C' suffix, which indicates a commercial grade of 0°C to 70°C. Confirm package details match the 32-pin (5mm × 5mm) Plastic QFN. Ensure compatibility with the required digital logic voltage levels, noting that OVDD must not exceed VDD by more than 300mV.

Analog To Digital Converters (ADC) Selection Notes

Select this component when simultaneous sampling of multiple channels is required without external multiplexing. The CUH-14 variant is suitable for commercial applications within the 0°C to 70°C range. For industrial (-40°C to 85°C) or high-temperature (-40°C to 125°C) environments, consider the IUH-14 or HUH-14 variants respectively. Ensure the application can accommodate the 39ns acquisition time requirement for full throughput.

Analog To Digital Converters (ADC) Part Context

This part belongs to the LTC2351-14 family of 14-bit SAR ADCs. The specific ordering suffix 'CUH' denotes the commercial temperature grade and the QFN package type. Other variants in the series include the IUH (industrial) and HUH (high-temperature) grades, all sharing identical electrical specifications but differing in operational temperature limits.

Analog To Digital Converters (ADC) Replacement Considerations

Direct replacements within the same package and specification set are the LTC2351IUH-14#PBF for industrial temperature ranges and the LTC2351HUH-14#PBF for extended high-temperature operation. Verify that the system thermal design accommodates the specific grade's requirements.