參數(shù)資料
型號(hào)： AD7747ARUZ-REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 1/28頁(yè)
文件大小： 0K
描述： IC CONV CAP TO DIG 24BIT 16TSSOP
標(biāo)準(zhǔn)包裝： 2,500
類型： 電容數(shù)字轉(zhuǎn)換器
分辨率（位）： 24 b
數(shù)據(jù)接口： 串行
電壓電源： 單電源
電源電壓： 2.7 V ~ 5.25 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 16-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 16-TSSOP
包裝： 帶卷 (TR)
配用： EVAL-AD7747EBZ-ND - BOARD EVAL FOR AD7747
24-Bit Capacitance-to-Digital Converter
with Temperature Sensor
AD7747
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
2007 Analog Devices, Inc. All rights reserved.
FEATURES
Capacitance-to-digital converter
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 (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
Proximity sensing
Level sensing
Flow metering
Impurity detection
GENERAL DESCRIPTION
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 program-
mable 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, I2C-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.
FUNCTIONAL BLOCK DIAGRAM
VIN(+)
VDD
CIN1(+)
VIN(–)
SHLD
GND
SDA
SCL
RDY
CIN1(–)
REFIN(+)
REFIN(–)
TEMP
SENSOR
24-BIT Σ-Δ
GENERATOR
DIGITAL
FILTER
I2C
SERIAL
INTERFACE
EXCITATION
CONTROL LOGIC
CALIBRATION
VOLTAGE
REFERENCE
CAP DAC 1
CAP DAC 2
CLOCK
GENERATOR
MUX
AD7747
0546
9-
00
1
Figure 1.
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