EVAL-AD7747EBZ: 内置温度传感器的24位电容数字转换器
AD7747是一款高分辨率、Σ-Δ电容数字转换器（CDC）,可直接与电容传感器的电容连接进行测量。该芯片还具有高分辨率（24位无失码、最高19.5位有效分辨率）、高线性度（±0.01%）和高精度（±10 fF工厂校准）等固有特性。AD7747的电容输入范围是±8 pF（可变）,而且可接受最大17 pF共模电容（不可变）,后者可以通过一个可编程片内数字电容转换器（CAPDAC）来平衡。AD7747针对一块极板接地的单端或差分输入电容传感器设计。对于浮动式（不接地）电容传感器,推荐使用AD7745或AD7746。
该器件内置一个片内温度传感器,其分辨率为0.1°C,精度为±2°C；还集成片内基准电压源和片内时钟发生器,因此在电容传感器应用中无需任何额外外部元件。此款器件配有一个标准电压输入,当与差分基准电压输入结合使用时,可方便地与一个外部温度传感器（如RTD、热敏电阻或二极管等）接口。AD7747具有一个双线式I^2C兼容串行接口,可采用2.7 V至5.25 V单电源供电,额定温度范围为-40°C至+125°C汽车电子温度范围,采用16引脚TSSOP封装。
The AD7747 is a high-resolution, Σ-Δ capacitance-to-digital converter (CDC). The capacitance to be measured is connected directly to the device inputs. The architecture features inherent high resolution (24-bit no missing codes, up to 19.5-bit effective resolution), high linearity (±0.01%), and high accuracy (±10 fF factory calibrated). The AD7747 capacitance input range is ±8 pF (changing), and it can accept up to 17 pF common-mode capacitance (not changing), which can be balanced by a programmable on-chip digital-to-capacitance converter (CAPDAC).
The AD7747 is designed for single-ended or differential capacitive sensors with one plate connected to ground. For floating (not grounded) capacitive sensors, the AD7745 or AD7746 are recommended.
The part has an on-chip temperature sensor with a resolution of 0.1°C and accuracy of ±2°C. The on-chip voltage reference and the on-chip clock generator eliminate the need for any external components in capacitive sensor applications. The part has a standard voltage input that, together with the differential reference input, allows easy interface to an external temperature sensor, such as an RTD, thermistor, or diode.
The AD7747 has a 2-wire, I^2C-compatible serial interface. The part can operate with a single power supply of 2.7 V to 5.25 V. It is specified over the automotive temperature range of -40°C to +125°C and is housed in a 16-lead TSSOP package.
产品应用领域 Applications
汽车电子、工业和医疗系统,用于：
- 压力测量
- 位置传感
- 近程传感
- 液位传感
- 流量计
- 杂质检测
产品应用领域 Applications
Automotive, industrial, and medical systems for:
- Pressure measurement
- Position sensing
- Proximity sensing
- Level sensing
- Flowmeters
- Impurity detections
EVAL-AD7747EBZ 特点
- 采用单芯片解决方案的新标准
- 可与单一或差分接地式传感器接口
- 分辨率：最低20 aF（即最高19.5位 ENOB）
- 精度：10 fF
- 线性度：0.01%
- 共模（不可变）电容最大可达17 pF
- 满量程（可变）电容范围：±8 pF
- 更新速率：5 Hz～45 Hz
- 8.1 Hz更新速率时,50 Hz、60 Hz同时抑制
- 有源屏蔽保护传感器连接
- 片内温度传感器：
分辨率：0.1°C,精度：±2°C - 电压输入通道
- 内部时钟振荡器
- 双线式串行接口（I^2C(R)兼容）
- 电源：
2.7 V至5.25 V单电源工作
功耗：0.7 mA - 工作温度范围：-40°C～+125°C
- 16引脚TSSOP封装
- New standard in single chip solutions
- Interfaces to single or differential grounded sensors
- Resolution down to 20 aF (that is, up to 19.5-bit ENOB)
- Accuracy: 10 fF
- Linearity: 0.01%
- Common-mode (not changing) capacitance up to 17 pF
- Full-scale (changing) capacitance range ±8 pF
- Update rate: 5 Hz to 45 Hz
- Simultaneous 50 Hz and 60 Hz rejection at 8.1 Hz update
- Active shield for shielding sensor connection
- Temperature sensor on-chip
Resolution: 0.1°C, accuracy: ±2°C - Voltage input channel
- Internal clock oscillator
- 2-wire serial interface (I^2C(R) compatible)
- Power
2.7 V to 5.25 V single-supply operation
0.7 mA current consumption - Operating temperature: -40°C to +125°C
- 16-lead TSSOP package
EVAL-AD7747EBZ 功能框图
AD7747 产品选型
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| AD7747ARUZ | Prodn | 16 ld TSSOP | 16 | 工业 |
| AD7747ARUZ-REEL | Prodn | 16 ld TSSOP | 16 | 工业 |
| AD7747ARUZ-REEL7 | Prodn | 16 ld TSSOP | 16 | 工业 |
| EVAL-AD7747EBZ | Prodn | EVALUATION BOARDS | - | 待定 |
EVAL-AD7747EBZ 应用技术支持与电子电路设计开发资源下载
- AD7747 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