EVAL-AD7715-3EBZ: 3 V或5 V、450 µA、16位Σ-Δ型ADC
AD7715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输入信号,并产生串行数字输出。它采用Σ-Δ转换技术,可实现最高16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输出更新速率进行调整。
AD7715具有一个差分模拟输入和一个差分基准电压输入。它采用单电源（+3 V或+5 V）供电,可处理以下范围的单极性输入信号：0 mV至+20 mV、0 mV至+80 mV、0 V至+1.25 V和0 V to +2.5 V；还可处理以下范围的双极性输入信号：±20 mV、±80 mV、±1.25 V和±2.5 V。这些双极性范围都以差分模拟输入的负极输入作为参考电压。因此,AD7715能处理单通道系统所有的信号调节和转换。
AD7715具有一个差分模拟输入和一个差分基准电压输入。它采用单电源（+3 V或+5 V）供电,可处理以下范围的单极性输入信号：0 mV至+20 mV、0 mV至+80 mV、0 V至+1.25 V和0 V 至 +2.5 V；还可处理以下范围的双极性输入信号：±20 mV、±80 mV、±1.25 V和±2.5 V。这些双极性范围都以差分模拟输入的负极输入作为参考电压。因此,AD7715能处理单通道系统所有的信号调节和转换。
AD7715非常适合基于微控制器或DSP的智能系统应用。它有一个串行接口,可用于三线式模式。利用输入串行端口,可在软件中进行增益设置、信号极性和更新速率选择。该器件包含自校准和系统校准选项,可消除器件本身或系统中的增益和失调误差。
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）。该器件提供三种封装：16引脚、0.3英寸宽、塑料双列直插式封装（DIP）；16引脚、0.3英寸宽、小形集成封装（SOIC）；以及16引脚超薄紧缩小型封装（TSSOP）。
The AD7715 is a complete analog front end for low frequency measurement applications. The part can accept low level input signals directly from a transducer and outputs a serial digital word. It employs a sigma-delta conversion technique to realize up to 16 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 output update rate.
The AD7715 features a differential analog input as well as a differential reference input. It operates from a single supply (+3 V or +5 V). It can handle unipolar input signal ranges of 0 mV to +20 mV, 0 mV to +80 mV, 0 V to +1.25 V and 0 V to +2.5 V. It can also handle bipolar input signal ranges of ±20 mV, ±80 mV, ±1.25 V and ±2.5 V. These bipolar ranges are referenced to the negative input of the differential analog input. The AD7715 thus performs all signal conditioning and conversion for a single-channel system.
The AD7715 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 update rate selection can be configured in software using the input serial port. The part contains self-calibration and system calibration options to eliminate gain and offset errors on the part itself or in the system.
CMOS construction ensures very low power dissipation, and the power-down mode reduces the standby power consumption to 15 µW typical at 3 V operation. The part is available in a 16-pin, 0.3 inch-wide, plastic dual-in-line package (DIP), a 16-lead 0.3 inch-wide small outline (SOIC) package and in a tiny 16-lead Thin Shrink Small Outline Package (TSSOP).
EVAL-AD7715-3EBZ 特点
- 电荷平衡ADC
- 16位无失码
- 0.0015%非线性度 - 可编程增益前端
- 增益范围：1、2、32和128
- 差分输入能力 - SPI®, QSPI™, MICROWIRE™, DSP 兼容
- 三线式串行接口
- 缓冲模拟输入
- 工作电压：3 V （AD7715-3）
或5 V （AD7715-5） - 低电源电流：450 µA（最大值、3 V电源）
- 内置可编程输出更新的低通滤波器
- 16引脚SOIC/DIP/TSSOP
- Charge-Balancing ADC
- 16 Bits No Missing Codes
- 0.0015% Nonlinearity - Programmable Gain Front End
- Gains of 1, 2, 32 and 128
- Differential Input Capability - SPI®, QSPI™, MICROWIRE™ and DSP Compatible
- Three-Wire Serial Interface
- Ability to Buffer the Analog Input
- 3 V (AD7715-3) or 5 V (AD7715-5) Operation
- Low Supply Current: 450 µA max @ 3 V Supplies
- Low-Pass Filter with Programmable Output Update
- 16-Lead SOIC/DIP/TSSOP
EVAL-AD7715-3EBZ 功能框图
EVAL-AD7715-3EBZ 应用技术支持与电子电路设计开发资源下载
- AD7715 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
