ADI LTC2358 18位低噪音4路同时取样SAR ADC解决方案

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 voltage applicationsrequiring wide dynamic range.
The LTC2357-18 supports pin-selectable SPI CMOS (1.8Vto 5V) and LVDS serial interfaces. Between one and fourlanes of data output may be employed in CMOS mode,allowing the user to optimize bus width and throughput.
LTC2358主要特性:
nnSimultaneous Sampling of 4 Buffered Channels
nn350ksps per Channel Throughput
nn500pA/12nA Max Input Leakage at 85℃/125℃
nn±3.5LSB INL (Maximum, ±10.24V Range)
nnGuaranteed 18-Bit, No Missing Codes
nnDifferential, Wide Common Mode Range Inputs
nnPer-Channel SoftSpan Input Ranges:
nn±10.24V, 0V to 10.24V, ±5.12V, 0V to 5.12V
nn±12.5V, 0V to 12.5V, ±6.25V,...