AD7785BRUZ:  3通道、低噪声、低功耗、20位Σ-Δ型ADC,内置片内仪表放大器和基准电压源

AD7785是一款适合高精度测量应用的低噪声、低功耗、完整模拟前端,内置一个含有三个差分模拟输入的低噪声20位Σ-Δ型ADC,还集成了片内低噪声仪表放大器,因而该ADC可直接输入小信号。当增益设置为64、更新速率为4.17 Hz时,均方根(RMS)噪声为40 nV。

该器件内置一个精密低噪声、低漂移内部带隙基准电压源,也可采用外部差分基准电压。其它片内特性包括可编程激励电流源、熔断电流控制和偏置电压产生器,利用偏置电压产生器可将某一通道的共模电压设置为AVDD/2。AD7785可以采用内部时钟或外部时钟工作,输出数据速率可通过软件编程设置,可在4.17 Hz至470 Hz的范围内变化。这款器件采用2.7 V至5.25 V电源供电,典型功耗为400 µA,采用16引脚TSSOP封装。

The AD7785 is a low power, low noise, complete analog front ends for high precision measurement applications. It contains a low noise 20-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 device contains a precision low noise, low drift internal band gap reference and can also 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 being used to set the common-mode voltage of a channel to AVDD/2.

The device can be operated with either the internal clock or an external clock. The output data rate from the part is software-programmable and can be varied from 4.17 Hz to 470 Hz.The part operates with a power supply from 2.7 V to 5.25 V. It consumes a current of 400 µA typical and is housed in 16-lead TSSOP packages.

产品应用领域 Applications
产品应用领域 Applications
AD7785BRUZ 特点
AD7785BRUZ 功能框图

AD7785 芯片订购指南
产品型号 产品状态 封装 引脚 温度范围
AD7785BRUZ Prodn 16 ld TSSOP 16 工业
AD7785BRUZ-REEL Prodn 16 ld TSSOP 16 工业
EVAL-AD7785EBZ Prodn EVALUATION BOARDS - 待定
AD7785BRUZ 应用技术支持与电子电路设计开发资源下载
  1. AD7785 数据手册DataSheet下载 . pdf
  2. Analog Devices, Inc.ADI 美国模拟器件公司产品订购手册 .pdf
  3. ADC模数转换器选型指南 . pdf