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AD7746ARUZ датащи(PDF) 1 Page - Analog Devices |
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AD7746ARUZ датащи(HTML) 1 Page - Analog Devices |
1 / 28 page 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 www.analog.com 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 CAP DAC VOLTAGE REFERENCE CONTROL LOGIC CALIBRATION AD7745 VDD REFIN(+) REFIN(–) GND SDA SCL RDY VIN(+) VIN(–) CIN1(+) CIN1(–) EXCA EXCB I2C SERIAL INTERFACE EXCITATION Figure 1. DIGITAL FILTER 24-BIT Σ-∆ MODULATOR MUX TEMP SENSOR CAP DAC CAP DAC VOLTAGE REFERENCE CONTROL LOGIC CALIBRATION AD7746 VDD REFIN(+) REFIN(–) GND SDA SCL RDY VIN(+) VIN(–) CIN1(+) CIN1(–) CIN2(+) CIN2(–) EXC1 EXC2 CLOCK GENERATOR I2C SERIAL INTERFACE EXCITATION Figure 2. |
Аналогичный номер детали - AD7746ARUZ |
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Аналогичное описание - AD7746ARUZ |
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