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| 型号： | AD7746ARUZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | IC CONV 2CH CAP TO DGTL 16-TSSOP |
| 设计资源： | Extending the Capacitive Input Range of AD7745/AD7746 (CN0129) |
| 标准包装： | 2,500 |
| 类型： | 电容数字转换器 |
| 分辨率（位）： | 24 b |
| 数据接口： | 串行 |
| 电压电源： | 单电源 |
| 电源电压： | 2.7 V ~ 5.25 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
| 配用： | EVAL-AD7746EBZ-ND - BOARD EVALUATION FOR AD7746 |
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24-Bit Capacitance-to-Digital Converter
with Temperature Sensor
AD7745/AD7746
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
2005 Analog Devices, Inc. All rights reserved.
FEATURES
Capacitance-to-digital converter
New standard in single chip solutions
Interfaces to single or differential floating sensors
Resolution down to 4 aF (that is, up to 21 ENOB)
Accuracy: 4 fF
Linearity: 0.01%
Common-mode (not changing) capacitance up to 17 pF
Full-scale (changing) capacitance range: ±4 pF
Tolerant of parasitic capacitance to ground up to 60 pF
Update rate: 10 Hz to 90 Hz
Simultaneous 50 Hz and 60 Hz rejection at 16 Hz
Temperature sensor on-chip
Resolution: 0.1°C, accuracy: ±2°C
Voltage input channel
Internal clock oscillator
2-wire serial interface (I2C
-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
APPLICATIONS
Automotive, industrial, and medical systems for
Pressure measurement
Position sensing
Level sensing
Flowmeters
Humidity sensing
Impurity detection
GENERAL DESCRIPTION
The AD7745/AD7746 are a high resolution, Σ-Δ capacitance-to-
digital converter (CDC). The capacitance to be measured is
connected directly to the device inputs. The architecture fea-
tures inherent high resolution (24-bit no missing codes, up to
21-bit effective resolution), high linearity (±0.01%), and high
accuracy (±4 fF factory calibrated). The AD7745/AD7746
capacitance input range is ±4 pF (changing), while 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 AD7745 has one capacitance input channel, while the
AD7746 has two channels. Each channel can be configured as
single-ended or differential. The AD7745/AD7746 are designed
for floating capacitive sensors. For capacitive sensors with one
plate connected to ground, the AD7747 is recommended.
The parts have 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
parts have a standard voltage input, which together with the
differential reference input allows easy interface to an external
temperature sensor, such as an RTD, thermistor, or diode.
The AD7745/AD7746 have a 2-wire, I2C-compatible serial
interface. Both parts can operate with a single power supply
from 2.7 V to 5.25 V. They are specified over the automotive
temperature range of –40°C to +125°C and are housed in a
16-lead TSSOP package.
FUNCTIONAL BLOCK DIAGRAMS
DIGITAL
FILTER
24-BIT
Σ-
MODULATOR
CLOCK
GENERATOR
MUX
TEMP
SENSOR
CAP DAC
VOLTAGE
REFERENCE
CONTROL LOGIC
CALIBRATION
AD7745
VDD
REFIN(+) REFIN(–)
GND
SDA
SCL
RDY
VIN(+)
VIN(–)
CIN1(+)
CIN1(–)
EXCA
EXCB
05468-001
I2C
SERIAL
INTERFACE
EXCITATION
Figure 1.
DIGITAL
FILTER
24-BIT
Σ-
MODULATOR
MUX
TEMP
SENSOR
CAP DAC
VOLTAGE
REFERENCE
CONTROL LOGIC
CALIBRATION
AD7746
VDD
REFIN(+) REFIN(–)
GND
SDA
SCL
RDY
VIN(+)
VIN(–)
CIN1(+)
CIN1(–)
CIN2(+)
CIN2(–)
EXC1
EXC2
05468-002
CLOCK
GENERATOR
I2C
SERIAL
INTERFACE
EXCITATION
Figure 2.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7746ARUZ-REEL7 | 功能描述:IC CONV 2CH CAP TO DGTL 16-TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| AD7747 | 制造商:AD 制造商全称:Analog Devices 功能描述:24-Bit Capacitance-to-Digital Converter with Temperature Sensor |
| AD7747ARUZ | 功能描述:IC CONV 24BIT CAP-DGTL 16-TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Data Converter Basics 标准包装:1 系列:- 类型:电机控制 分辨率（位）:12 b 采样率（每秒）:1M 数据接口:串行，并联 电压电源:单电源 电源电压:2.7 V ~ 3.6 V，4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:100-TQFP 供应商设备封装:100-TQFP（14x14） 包装:剪切带 (CT) 其它名称:296-18373-1 |
| AD7747ARUZ-REEL | 功能描述:IC CONV CAP TO DIG 24BIT 16TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| AD7747ARUZ-REEL7 | 功能描述:IC CONV CAP TO DIG 24BIT 16TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
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