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LTC2381-16 - 16-Bit, 250ksps, Low Power SAR ADC with Serial Interface

The LTC2381-16 is a low noise, low power, high speed 16-bit successive approximation register (SAR) ADC. Operating from a 2.5V supply, the LTC2381-16 has a ±2.5V fully differential input range. The LTC2381-16 consumes only 3.25mW and achieves ±2LSB INL max, no missing codes at 16-bits and 92dB SNR.

The LTC2381-16 has a high speed SPI-compatible serial interface that supports 1.8V, 2.5V, 3.3V and 5V logic while also featuring a daisychain mode. The fast 250ksps throughput with no cycle latency makes the LTC2381-16 ideally suited for a wide variety of high speed applications. An internal oscillator sets the conversion time, easing external timing considerations. The LTC2381-16 automatically powers down between conversions, leading to reduced power dissipation that scales with the sampling rate.

The LTC2381-16 features a proprietary sampling architecture that enables the ADC to begin acquiring the next sample during the current conversion. The resulting extended acquisition time of 3.25μs allows the use of extremely low power ADC drivers.

Features 250ksps Throughput Rate ±2LSB INL (Max) Guaranteed 16-Bit No Missing Codes Low Power: 3.25mW at 250ksps, 13μW at 1ksps 92dB SNR (typ) at fIN = 20kHz Extended Acquisition Time of 3.25μs Allows Use of Lower Power Drivers Guaranteed Operation to 125°C 2.5V Supply Fully Differential Input Range ±2.5V External 2.5V Reference Input No Pipeline Delay, No Cycle Latency 1.8V to 5V I/O Voltages SPI-Compatible Serial I/O with Daisy-Chain Mode Internal Conversion Clock 16-pin MSOP and 4mm × 3mm DFN Packages Typical Application

Applications Medical Imaging High Speed Data Acquisition Portable or Compact Instrumentation Industrial Process Control Low Power Battery-Operated Instrumentation ATE Packaging

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