Linear LTC2379-18低功耗高速18位SAR模数转换方案

Linear 公司的LTC2379-18是低功耗高速18位SAR模数转换器（ADC），单电源2.5V工作，± VREF全差分输入从2.5V 到5.1V，功耗仅为18mW，INL为±2LSB，18位精度时不丢失码，而SNR达到101dB，高速SPI接口支持1.8V, 2.5V, 3.3V 和 5V逻辑电平，吞吐量达1.6Msps，数字增益压缩（DGC），主要用在医疗图像，高速数据采集，手提仪表，工业过程控制和低功耗ATE等。本文介绍了LTC2379-18主要特性，方框图，典型应用电路图，输入信号链以及演示板部分电路图和LT6530与LTC2379-18连接配置图。

The LTC2379-18 is a low noise, low power, high speed 18-bit successive approximation register (SAR) ADC. Operating from a 2.5V supply, the LTC2379-18 has a ± VREF fully differential input range with VREF ranging from 2.5V to 5.1V. The LTC2379-18 consumes only 18mW and achieves ±2LSB INL maximum, no missing codes at 18-bits with 101dB SNR.

The LTC2379-18 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 1.6Msps throughput with no cycle latency makes the LTC2379-18 ideally suited for a wide variety of high speed applications.

An internal oscillator sets the conversion time, easing external timing considerations. The LTC2379-18 automatically powers down between conversions, leading to reduced power dissipation that scales with the sampling rate.
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