Data Conversion Chip-AST8326S
AST8326S是国科安芯研制的一款16位单端模数转换器，工作速率为400KSPS。AST8326S具有出色的线性度、极低的噪声和失真。它还具有同步串行（兼容SPI/SSI）接口和伪差分输入。工作电压范围为2.7V至5.5V，参考电压可设置为0.1V至VDD范围内的任意值，即使在全数据速率下运行，其功耗也极低。在较低的数据速率下，该器件的高速特性使其大部分时间处于掉电模式，是便携式和电池供电系统的理想选择。它也完美适用于远程数据采集模块、同步多通道系统和隔离式数据采集。AST8326S采用先进抗辐照加固设计，可应用于商业航天、核电站等高安全需求场景。
Product Details
- 16位无缺失码（REF=2.5V）
- 超低噪声(REF=2.5V):33µVrms
- 优异的线性度(REF=2.5V):
- ±1.5LSB typ INL
- ±0.8LSB typ DNL
- ±0.5mV typ Offset
- ±3LSB typ Gain Error
- 微功率：
- 12.5mW at 5V, 400KSPS
- 4.86mW at 2.7V, 300KSPS
- 1.62mW at 2.7V, 100KSPS
- 162µW at 2.7V, 10KSPS
- 封装：MSOP8
- SEU≥37MeV.cm²/mg或10−5次/器件天（商业航天级）
- SEL≥37MeV.cm²/mg（商业航天级）
- TID≥100krad（Si）（商业航天级）
封装类型：MSOP8
抗辐照：
- SEU: ≥37MeV.cm²/mg或10−5次/器件.天（商业航天级）
- SEL: ≥37MeV.cm²/mg（商业航天级）
- TID: ≥100krad（Si）（商业航天级）
典型应用
高精度星载遥测采集（核心场景）
16位无缺失代码：以REF=2.5V为例，LSB≈38μV，相比12位ADC的1.22mV（5V供电），精度提升了约32倍。这意味着可以分辨亚毫伏级的信号变化，对于应变片桥路输出（满量程仅几十毫伏）等微弱信号场景至关重要；
超低噪声33µVrms（REF=2.5V）：即使在16位分辨率下，本底噪声仍远低于1LSB，有效位数（ENOB）可达约14位，确保测量链路的信噪比优势不被ADC自身噪声消耗；
优异的线性度：INL±1.5LSB（典型）、DNL±0.8LSB（典型），保证在整个输入范围内转换结果的单调性和准确性，不会出现跳码或非线性失真。
星载精密传感器前端
伪差分输入可抑制共模噪声，在星上电源母线纹波较大的环境下，有效提高测量精度。
外部参考电压可灵活设定（0.1V~VDD），允许根据传感器满量程输出范围优化LSB大小，最大化动态范围。
星载电池管理系统（BMS）
精密过程参数监测
以4-20mA电流环信号为例，经250Ω电阻转换为1-5V电压后，16位ADC的LSB≈76μV（REF=5V），对应电流分辨率约0.3μA，远优于常规12位方案。
INL±1.5LSB保证在整个量程范围内的线性度，不会因非线性引入额外测量误差。
核安全级仪控系统（DCS）
辐射监测仪表
Product Manual
AST8326S数据手册V1.0.pdfRelated Products
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