Linear LTC2373－18 18位8路SAR ADC解决方案

Linear公司的LTC2373-18是18位取样频率1Msps的8路SAR低噪音高速模数转换器(ADC),SNR为100dB,工作电压单源5V,具有高度可配置低串扰8路输入复接器,支持全差分,假差分单极和假差分双极信号输入,典型功耗40mW,主要用在可编逻辑控制器(PLC),工业过程控制,高速数据采集,手持仪表和自动测试设备(ATE).本文介绍了LTC2373-18主要特性,框图,几种应用电路,以及演示板DC2071A主要特性,电路图,材料清单和PCB元件布局图.
The LTCR2373-18 is a low noise, high speed, 8-channel18-bit successive approximation register (SAR) ADC. Operatingfrom a single 5V supply, the LTC2373-18 has a highlyconfigurable, low crosstalk 8-channel input multiplexer,supporting fully differential, pseudo-differential unipolar and pseudo-differential bipolar analog input ranges. TheLTC2373-18 achieves ±2.75LSB INL (maximum) in allinput ranges, no missing codes at 18-bits and 100dB (fullydifferential)/ 95dB (pseudo-differential) SNR (typical).
The LTC2373-18 has an onboard low drift (20ppm/°C max)2.048V temperature-compensated reference and a singleshotcapable reference buffer. The LTC2373-18 also has ahigh speed SPI-compatible serial interface that supports1.8V, 2.5V, 3.3V and 5V logic through which a sequencerwith a depth of 16 may be programmed. An internal oscillatorsets the conversion time, easing external timingconsiderations. The LTC2373-18 dissipates only 40mWand automatically naps between conversions, leading toreduced power dissipation that scales with the samplingrate. A sleep mode is also provided to reduce the powerconsumption of the LTC2373-18 to 300μW for furtherpower savings during inactive periods.
LTC2373-18主要特性:
1Msps Throughput Rate
18-Bit Resolution with No Missing Codes
8-Channel Multiplexer with Selectable Input Range
Fully Differential (±4.096V)
Pseudo-Differential Unipolar (0V to 4.096V)
Pseudo-Differential Bipolar (±2.048V)
INL: ±2.75LSB (Maximum)
SNR: 100dB (Fully Differential)/95dB (Pseudo-Differential) (Typical) at fIN = 1kHz
THD: –110dB (Typical) at fIN = 1kHz
Program...