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AD7152BRMZ-REEL Datasheet(PDF) 1 Page - Analog Devices |
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AD7152BRMZ-REEL Datasheet(HTML) 1 Page - Analog Devices |
1 / 24 page 12-Bit Capacitance-to-Digital Converter Data Sheet AD7152/AD7153 Rev. A Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesfor itsuse,norfor anyinfringements ofpatents orother 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 ©2008–2016 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES Capacitance-to-digital converters Interfaces to floating sensors Resolution down to 0.25 fF (that is, up to 12 ENOB) Linearity: 0.05% Common-mode (not changing) capacitance up to 5 pF Four capacitance ranges selectable per operation mode ±0.25 pF to ±2 pF in differential mode 0.5 pF to 4 pF in single-ended mode Tolerant of parasitic capacitance to ground up to 50 pF Conversion time per channel: 5 ms, 20 ms, 50 ms, and 60 ms Internal clock oscillator 2-wire serial interface (I2C-compatible) Power 2.7 V to 3.6 V single-supply operation 100 μA current consumption Operating temperature: −40°C to +85°C 10-lead MSOP APPLICATIONS Automotive, industrial, and medical systems for Pressure measurement Position sensing Level sensing Flowmeters Humidity sensing FUNCTIONAL BLOCK DIAGRAMS DIGITAL FILTER 12-BIT Σ-∆ MODULATOR CLOCK GENERATOR VOLTAGE REFERENCE AD7152 I2C SERIAL INTERFACE EXCITATION EXC2 CIN1(+) CIN1(–) CIN2(+) CIN2(–) EXC1 SDA SCL VDD GND CONTROL LOGIC CALIBRATION CAP+ CAP– MUX Figure 1. DIGITAL FILTER 12-BIT Σ-∆ MODULATOR CLOCK GENERATOR VOLTAGE REFERENCE AD7153 I2C SERIAL INTERFACE EXCITATION CIN1(+) CIN1(–) EXC1 SDA SCL VDD GND CONTROL LOGIC CALIBRATION CAP+ CAP– MUX Figure 2. GENERAL DESCRIPTION The AD7152/AD7153 are 12-bit sigma-delta (Σ-Δ) capacitance-to- digital converters (CDCs). The capacitance to be measured is connected directly to the device inputs. The architecture features inherent high resolution (12-bit no missing codes, up to 12-bit effective resolution) and high linearity (±0.05%). The AD7152/ AD7153 have four capacitance input ranges per operation mode, ±0.25 pF to ±2 pF in differential mode and 0.5 pF to 4 pF in single-ended mode. The AD7152/AD7153 can accept up to 5 pF common-mode capacitance (not changing), which can be balanced by a programmable on-chip, digital-to-capacitance converter (CAPDAC). The AD7153 has one capacitance input channel, while the AD7152 has two channels. Each channel can be configured as single-ended or differential. The AD7152/AD7153 are designed for floating capacitive sensors. The AD7152/AD7153 have a 2-wire, I2C-compatible serial interface. Both devices can operate with a single power supply from 2.7 V to 3.6 V. They are specified over the temperature range of −40°C to +85°C and are available in a 10-lead MSOP. |
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