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
- 电荷平衡ADC
- 24位无失码
- ±0.0015%非线性度 - 内置可编程滤波截止的低通滤波器
- 读/写校准系数
- 双向微控制器串行接口
- 3通道可编程增益前端
- 增益范围：1至128
- 2个差分输入
- 1个单端高电压输入 - 单电源供电
- 低功耗（典型值3.5 mW）,
带省电模式（典型值150 µW） - Charge Balancing ADC
- 24 Bits No Missing Codes
- ±0.0015% Nonlinearity - Low-Pass Filter with Programmable Filter Cutoffs
- Ability to Read/Write Calibration Coefficients
- Bidirectional Microcontroller Serial Interface
- 3-Channel Programmable Gain Front End
- Gains from 1 to 128
- 2 Differential Inputs
- 1 Single-Ended High Voltage Input - Single-Supply Operation
- Low Power (3.5 mW typ) with Power-Down Mode (150 µW typ)
AD7713AN 功能框图
| 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
- AD7713 数据手册DataSheet下载 . pdf
- Analog Devices, Inc.ADI 美国模拟器件公司产品订购手册 .pdf
- ADC模数转换器选型指南 . pdf
