AD7713AN:  内置匹配RTD电流源的CMOS、低功耗24位Σ-Δ型信号调理ADC

AD7713是一款适合低频测量应用的完整模拟前端,可直接接受来自传感器的低电平信号,也可接受高电平信号(4 × VREF ),并产生串行数字输出。它采用Σ-Δ转换技术,可实现最高24位无失码性能。输入信号加在一个以模拟调制器为基础的专有可编程增益前端。调制器输出由片内数字滤波器处理。此数字滤波器的第一个陷波可通过片内控制寄存器进行编程,以便对滤波器截止和建立时间进行调整。

该器件具有两个差分模拟输入、一个单端高电平模拟输入和一个差分基准电压输入,可采用单电源供电(+5 V AVDD和DVDD)。该器件提供两个电流源,可用来在三线式和四线式RTD配置中提供激励。因此,AD7713能处理单通道、双通道或三通道系统所有的信号调节和转换。

AD7713非常适合基于微控制器的智能系统应用。利用双向串行端口,可在软件中进行增益设置、信号极性选择和RTD电流控制配置。AD7713包含自校准、系统校准和后台校准选项,同时允许用户读取和写入片内校准寄存器。

CMOS构造可确保低功耗,硬件可编程省电模式则将待机功耗降至仅150 µW(典型值)。该器件提供两种封装:24引脚、0.3英寸宽、塑料密封双列直插式封装(DIP)和24引脚小形集成封装(SOIC)。

The AD7713 is a complete analog front end for low frequency measurement applications. The device accepts low level signals directly from a transducer or high level signals (4 × VREF ) and outputs a serial digital word. It employs a sigma-delta conversion technique to realize up to 24 bits of no missing codes performance. The input signal is applied to a proprietary programmable gain front end based around an analog modulator. The modulator output is processed by an on-chip digital filter. The first notch of this digital filter can be programmed via the on-chip control register allowing adjustment of the filter cutoff and settling time.

The part features two differential analog inputs and one single-ended high level analog input as well as a differential reference input. It can be operated from a single supply (AVDD and DVDD at +5 V). The part provides two current sources which can be used to provide excitation in three-wire and four-wire RTD configurations. The AD7713 thus performs all signal conditioning and conversion for a single, dual or three-channel system.

The AD7713 is ideal for use in smart, microcontroller-based systems. Gain settings, signal polarity and RTD current control can be configured in software using the bidirectional serial port. The AD7713 contains self-calibration, system calibration and background calibration options and also allows the user to read and to write the on-chip calibration registers.

CMOS construction ensures low power dissipation and a hardware programmable power-down mode reduces the standby power consumption to only 150 µW typical. The part is available in a 24-pin, 0.3 inch wide, plastic and hermetic dual-in-line package (DIP) as well as a 24-lead small outline (SOIC) package.

AD7713AN 特点
AD7713AN 功能框图

AD7713 芯片订购指南
产品型号 产品状态 封装 引脚 温度范围
AD7713AN 量产 24 ld PDIP 24 工业
AD7713ANZ 量产 24 ld PDIP 24 工业
AD7713AQ 量产 CERDIP GLASS SEAL 24 工业
AD7713AR 量产 24 ld SOIC - Wide 24 工业
AD7713AR-REEL 量产 24 ld SOIC - Wide 24 工业
AD7713AR-REEL7 量产 24 ld SOIC - Wide 24 工业
AD7713ARZ 量产 24 ld SOIC - Wide 24 工业
AD7713ARZ-REEL 量产 24 ld SOIC - Wide 24 工业
AD7713SQ 量产 CERDIP GLASS SEAL 24 军用
AD7713AN 应用技术支持与电子电路设计开发资源下载
  1. AD7713 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