EVAL-AD7714-3EBZ: CMOS、3V或5V、500 µA、24位Σ-Δ型信号调理ADC
AD7714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,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。
该器件具有三个差分模拟输入（也可以配置为五个伪差分模拟输入）和一个差分基准电压输入。因此,AD7714能处理最多由5个通道组成系统的所有信号调节和转换。最近在现有产品中已加入一个新的Y级。与A级相比,这一新级别扩展了工作温度范围,在SCLK和DIN上提供施密特触发器输入,提供更严格的线性度规格和更低的功耗,并采用更小的封装。
AD7714非常适合基于微控制器或DSP智能系统应用。它有一个串行接口,可用于三线式模式。利用串行端口,可在软件中进行增益设置、信号极性选择和通道选择。AD7714提供了自校准、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构造可确保获得极低的功耗,省电模式则将采用3 V电源时的待机功耗降至15 µW（典型值）。A级的最低工作电压为3 V,Y级则为2.7 V。A级提供三种封装：24引脚、0.3英寸宽、塑料双列直插式封装（DIP）；24引脚小形集成封装（SOIC）；以及28引脚紧缩小型封装（SSOP）。新的Y级也提供三种封装：24引脚、0.3英寸宽、塑料双列直插式封装（DIP）；24引脚小形集成封装（SOIC）；以及24引脚超薄紧缩小型封装（TSSOP）。
The AD7714 is a complete analog front end for low-frequency measurement applications. The device accepts low level signals directly from a transducer 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 three differential analog inputs (which can also be configured as five pseudo-differential analog inputs) as well as a differential reference input. The AD7714 thus performs all signal conditioning and conversion for a system consisting of up to five channels. A new Y grade has recently been added to the existing range. Compared to the A grades this new grade has an extended operating temperature range, schmitt trigger inputs on SCLK and DIN, tighter linearity specifications, lower power consumption and is available in a smaller package.
The AD7714 is ideal for use in smart microcontroller- or DSP-based systems. It features a serial interface that can be configured for three-wire operation. Gain settings, signal polarity and channel selection can be configured in software using the serial port. The AD7714 provides self-calibration, system calibration and background calibration options and also allows the user to read and write the on-chip calibration registers.
CMOS construction ensures very low power dissipation, and the power-down mode reduces the standby power consumption to 15 µW typical at 3 V. Minimum operating voltage for the A grades is 3 V and 2.7 V for the Y grades. The A grades are available in a 24-pin, 0.3 inch-wide, plastic dual-in-line package (DIP); a 24 lead small outline (SOIC) package and a 28-lead shrink small outline package (SSOP). The new Y grade is available in a 24-pin, 0.3 inch-wide, plastic dual-in-line package (DIP); a 24 lead small outline (SOIC) package and a 24-lead Thin Shrink Small Outline Package (TSSOP).
EVAL-AD7714-3EBZ 特点
- 电荷平衡ADC
- 24位无失码
- 0.0015%非线性度 - 5通道可编程增益前端
- 增益范围：1至128
- 可配置为3个全差分
- 输入或5个伪差分输入 - 三线式串行接口
- SPI®, QSPI™, MICROWIRE™, DSP 兼容 - 工作电压：3 V（AD7714-3）
或5 V（AD7714-5） - 低功耗电流：典型值350 µA,
带省电模式5 µA（典型值） - 低噪声（<150 nV有效值）
- 内置可编程滤波截止的低通滤波器
- 欲了解更多特性,请参考数据手册
- Charge Balancing ADC
- 24 Bits No Missing Codes
- 0.0015% Nonlinearity - Five-Channel Programmable Gain Front End
- Gains from 1 to 128
- Can Be Configured as Three Fully Differential
- Inputs or Five Pseudo-Differential Inputs - Three-Wire Serial Interface
- SPI®, QSPI™, MICROWIRE™ and DSP Compatible - 3 V (AD7714-3) or 5 V (AD7714-5) Operation
- Low Current (350 µA typ) with Power-Down (5 µA typ)
- Low Noise (<150 nV rms)
- Low-Pass Filter with Programmable Filter Cutoffs
- Please see data sheet for additional features
EVAL-AD7714-3EBZ 功能框图
EVAL-AD7714-3EBZ 应用技术支持与电子电路设计开发资源下载
- AD7714 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
