20-bit SAR ADC at 1 MSPS — what it means for the signal chain
The LTC2378CDE-20#PBF from Linear Technology is a 20-bit successive-approximation-register (SAR) ADC that samples a single differential input at 1 MSPS. That combination — 20-bit resolution at a megasample per second — puts it in a narrow performance band: you get the dynamic range of a precision converter without giving up the throughput needed for fast-scanning data-acquisition systems, vibration analysis, or high-speed closed-loop control. The SPI interface keeps the digital side simple, and the external reference gives you control over the full-scale range and noise floor.
Supply and interface — what to budget on the board
Both the analog and digital supplies run from 2.375 V to 2.625 V. The SPI interface operates at the same digital supply level.
Lifecycle and sourcing — active, no LTB watch needed
The LTC2378CDE-20#PBF carries an Active lifecycle status. For a 20-bit, 1 MSPS ADC, that is a useful assurance: precision converters in this speed class often get superseded, but this one is still a supported catalog line.