データシートサーチシステム |
|
AD7747 データシート(PDF) 1 Page - Analog Devices |
|
AD7747 データシート(HTML) 1 Page - Analog Devices |
1 / 29 page 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 Figure 1. |
同様の部品番号 - AD7747 |
|
同様の説明 - AD7747 |
|
|
リンク URL |
プライバシーポリシー |
ALLDATASHEET.JP |
ALLDATASHEETはお客様のビジネスに役立ちますか? [ DONATE ] |
Alldatasheetは | 広告 | お問い合わせ | プライバシーポリシー | リンク交換 | メーカーリスト All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |