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| 型號(hào)： | AD7747 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 24-Bit Capacitance-to-Digital Converter with Temperature Sensor |
| 中文描述： | 24位的電容數(shù)字轉(zhuǎn)換器的溫度傳感器 |
| 文件頁(yè)數(shù)： | 1/20頁(yè) |
| 文件大?。?/td> | 200K |
| 代理商： | AD7747 |
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24-Bit Capacitance-to-Digital Converter
with Temperature Sensor
Preliminary Technical Data
AD7747
FEATURES
Capacitance-to-digital converter
New standard in single chip solutions
Interfaces to single or differential grounded sensors
Resolution down to 40 aF (that is, up to 18.5-bit ENOB)
Accuracy: 8 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
2
C
-compatible)
Power
2.7 V to 5.25 V single-supply operation
1 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
Flowmeters
Impurity detection
Rev.
PrC,
28. July 2006
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
2006 Analog Devices, Inc. All rights reserved.
www.analog.com
GENERAL DESCRIPTION
The AD7747 is a high-resolution,
Σ
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 18 bit effective
resolution), high linearity (±0.01%), and high accuracy (±8 fF
factory calibrated). The AD7747 capacitance input range is
±8 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 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, which 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
2
C-compatible serial interface. The
part can operate with a single power supply 2.7 V to 5.25 V.
It is specified over the automotive temperature range of
–40°C to +125°C and are housed in a 16-lead TSSOP package.
FUNCTIONAL BLOCK DIAGRAMS
SCL
SDA
CLOCK
GENERATOR
TEMP
SENSOR
MUX
DIGITAL
FILTER
VDD
I2C
SERIAL
INTERFACE
CAP DAC 1
EXCITATION
AD7747
CIN1(+)
VIN(+)
VIN(
-
)
GND
24-BIT
Σ
-
MODULATOR
CAP DAC 2
SHLD
CIN1(
-
)
REFIN(+)
Figure 1.
REFIN(
-
)
CONTROL LOGIC
CALIBRATION
RDY
VOLTAGE
REFERENCE
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