ADI AD7193四路24位Sigma-Delta ADC解决方案

ADI 公司的AD7193是四路4.8 kHz超低噪音24位Sigma-Delta ADC, MS噪音为11 nV @ 4.7 Hz (增益 = 128),增益=1时的无噪音位多达22位,失调漂移±5 nV/℃,增益漂移±1 ppm/℃,可编程增益1-128,AVDD为3 V 到 5.25 V ,DVDD为 2.7 V 到5.25 V ,电流为 4.65 mA ,主要用PLC/DCS模拟输入模块,数据采集,应力仪传感器,压力测量,温度和流量测量,医疗和科学仪器.本文介绍AD7193主要特性,方框图,基本连接框图,流量仪应用电路和评估板EVAL-AD7193EBZ主要特性,方框图,电路图和材料清单与元件布局图.

4-Channel, 4.8 kHz, Ultralow Noise, 24-Bit Sigma-Delta ADC with PGA

The AD7193 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC). The on-chip low noise gain stage means that signals of small amplitude can interface directly to the ADC.

The device can be configured to have four differential inputs or eight pseudo differential inputs. The on-chip channel sequencer allows several channels to be enabled simultaneously, and the AD7193 sequentially converts on each enabled channel, simplifying communication with the part. The on-chip 4.92 MHz clock can be used as the clock source to the ADC or, alternatively, an external clock or crystal can be used. The output data rate from the part can be varied from 4.7 Hz to 4.8 kHz.
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