ADI AD4114单电源多路24位Sigma－Delta ADC解决方案

ADI公司的AD4114单电源低功耗低噪音多路24位Sigma-Delta(Σ-Δ)模拟数转换器(ADC),集成了用于差分或单端高阻抗(≥1 MΩ)双极±10 V电压输入的模拟前端(AFE).此外,AD4114集成了主要模拟和数字信号调理区块,用来配置八个单独建立的每一个模拟输入通路. AD4114具有最大通路扫描速率6.21 kSPS (161 μs),用于全确定的数据.其嵌入的2.5V低飘移(±5 ppm/C)带宽基准电压(带输出基准缓冲器),从而降低了外接元件数量.数字滤波器允许灵活设定,包括在27.27 SPS输出数据速率的50Hz和60Hz的抑制.用户可根据应用每路的要求来选择不同滤波器的设定.器件具有快速和灵活的输出速率,从1.25 SPS 到 31.25 kSPS,每路20SPS时的50Hz和60Hz的共模抑制比为120dB.电源电压AVDD = 3.0 V to 5.5 V ,IOVDD = 2 V to 5.5 V.总电流消耗AVDD + IOVDD (IDD) = 3.9 mA,温度范围从−40C 到 +105C,3线或4线串行数字接口.主要用在过程控制,可编逻辑控制器(PLC)和分布控制系统(DCS)模块以及仪器和仪表.本文介绍了AD4114主要特性,功能框图, 评估板EVAL-AD4114SDZ主要特性,框图,电路图,材料清单和PCB设计图.

 Single Supply, Multichannel, 31.25 kSPS, 24-Bit, Sigma-Delta ADC with ±10 V Inputs

 The AD4114 is a low power, low noise, 24-bit, sigma-delta (Σ-Δ) analog-to-digital converter (ADC) that integrates an analog front end (AFE) for fully differential or single-ended, high impedance (≥1 MΩ), bipolar, ±10 V voltage inputs. The AD4114 integrates key analog and digital signal conditioning blocks to configure eight individual setups for each analog input channel in use. The AD4114 features a maximum channel scan rate of 6.21 kSPS (161 μs) for fully settled data. The embedded 2.5 V, low drift (±5 ppm/C), band gap internal reference (with output reference buffer) reduces the external component count. The digital filter allows flexible settings, including simultaneous 50 Hz and 60 Hz rejection at a 27.27 SPS output data rate. The user can select different filter settings depending on the requirements of each channel in the application. The automatic channel sequencer enables the ADC to switch through each enab...