ADI AD7793热电偶测量系统解决方案
ADI公司的 AD7792/3是高精度测量系统的低功耗低噪音模拟前端(AFE),包括三个差分模拟输出的低噪音16/24位Delta-Sigma ADC,仪表放大器能直接连接到ADC,增益设定为64,4.17Hz的噪音为40nV,工作电压2.7-5.25V, 主要用在热电偶测量,RTD测量,气体分析,工业过程控制,手持仪表,血液分析以及6位DVM等.本文介绍了AD7793主要特性,方框图, RTD和热电偶测量电路图以及采用AD7793 24位Sigma-Delta ADC完整的热电偶测量系统电路图和材料厂清单.
The AD7792/AD7793 are low power, low noise, complete analog front ends for high precision measurement applications. The AD7792/AD7793 contain a low noise 16-/24-bit Σ-Δ ADC with three differential analog inputs. The on-chip, low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. With a gain setting of 64, the rms noise is 40 nV when the update rate equals 4.17 Hz.
The devices contain a precision low noise, low drift internal band gap reference and can accept an external differential reference. Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage generator. The bias voltage generator sets the common-mode voltage of a channel to AVDD/2.
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