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AD7747 Datasheet(PDF) 1 Page - Analog Devices |
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AD7747 Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page 24-Bit Capacitance-to-Digital Converter with Temperature Sensor Preliminary Technical Data AD7747 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 www.analog.com Fax: 781.461.3113 © 2006 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 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 (I2C ®-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 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, I2C-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(+) REFIN(-) CONTROL LOGIC CALIBRATION RDY VOLTAGE REFERENCE Figure 1. |
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