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[原创] ADI LTC2358 18位低噪音4路同时取样SAR ADC解决方案

关键词:工业控制 测试测量 工业过程控制 可编逻辑控制器(PLC)

时间:2018-07-31 11:13:39       作者:ADI       来源:中电网

ADI公司的LTC2357-18是18位低噪音4路同时取样SAR ADC,具有缓冲差分,宽共模范围微微安培(picoamp)输入.每路吞吐量350ksps,在85℃/125℃ 时最大限度输入漏电500pA/12nA, ±3.5LSB IN,保证18位不丢码,工作电压5V,容纳±10.24V, 0V 到10.24V, ±5.12V, 或 0V to到5.12V,主要用在可编逻辑控制器(PLC),工业过程控制,测试测量和动力线监测.本文介绍了LTC2358主要特性,框图和应用框图,演示板DC2365A主要特性,电路图,材料清单和PCB设计图.

The LTC.2357-18 is an 18-bit, low noise 4-channelsimultaneous sampling successive approximation register(SAR) ADC with buffered differential, wide commonmode range picoamp inputs. Operating from a 5V lowvoltage supply, flexible high voltage supplies, and usingthe internal reference and buffer, each channel of thisSoftSpan™ ADC can be independently configured on aconversion-by-conversion basis to accept ±10.24V, 0V to 10.24V, ±5.12V, or 0V to 5.12V signals. Individual channelsmay also be disabled to increase throughput on theremaining channels.

The integrated picoamp-input analog buffers, wideinput common mode range and 128dB CMRR of theLTC2357-18 allow the ADC to directly digitize a varietyof signals using minimal board space and power. Thisinput signal flexibility, combined with ±3.5LSB INL, nomissing codes at 18 bits, and 96.4dB SNR, makes theLTC2357-18 an ideal choice for many high voltag..

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