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AD7153 반도체 회로 부품 판매점

12-Bit Capacitance-to-Digital Converter



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Analog Devices
AD7153 데이터시트, 핀배열, 회로
Data Sheet
12-Bit Capacitance-to-Digital Converter
AD7152/AD7153
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
VDD
CIN1(+)
CIN1(–)
EXC1
CIN2(+)
CIN2(–)
EXC2
CAP+
CAP–
AD7152
CLOCK
VOLTAGE
GENERATOR REFERENCE
MUX
12-BIT Σ-
MODULATOR
I2C
SERIAL
INTERFACE
SDA
SCL
EXCITATION
DIGITAL
FILTER
CONTROL LOGIC
CALIBRATION
GND
Figure 1.
VDD
CAP+
CAP–
AD7153
CLOCK
VOLTAGE
GENERATOR REFERENCE
CIN1(+)
CIN1(–)
EXC1
MUX
12-BIT Σ-
MODULATOR
I2C
SERIAL
INTERFACE
SDA
SCL
EXCITATION
DIGITAL
FILTER
CONTROL LOGIC
CALIBRATION
GND
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.
Rev. A
Document Feedback
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.
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


AD7153 데이터시트, 핀배열, 회로
AD7152/AD7153
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagrams............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications .................................................................. 5
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configurations and Function Descriptions ........................... 7
Typical Performance Characteristics ............................................. 8
Serial Interface ................................................................................ 11
Write Operation.......................................................................... 11
Read Operation........................................................................... 11
AD7152/AD7153 Reset .............................................................. 12
General Call................................................................................. 12
Register Map.................................................................................... 13
Status Register ............................................................................. 14
Data Registers ............................................................................. 15
Offset Calibration Registers ...................................................... 15
Gain Calibration Registers ........................................................ 15
CAP Setup Registers .................................................................. 16
REVISION HISTORY
2/16—Rev. 0 to Rev. A
Change to Address 0x01, Address 0x02 for Channel 1, Address
0x03, Address 0x04 (AD7152 Only) for Channel 2, 16 Bits,
Read-Only, Default Value 0x0000 Section .................................. 15
Updated Outline Dimensions ....................................................... 23
5/08—Revision 0: Initial Version
Data Sheet
Configuration Register .............................................................. 16
CAPDAC POS Register ............................................................. 17
CAPDAC NEG Register ............................................................ 17
Configuration2 Register ............................................................ 17
Circuit Description......................................................................... 18
Capacitance-to-Digital Converter (CDC) .............................. 18
Excitation Source........................................................................ 18
CAPDAC ..................................................................................... 19
Single-Ended Capacitive Input................................................. 19
Differential Capacitive Input .................................................... 20
Parasitic Capacitance to Ground.............................................. 20
Parasitic Resistance to Ground................................................. 20
Parasitic Parallel Resistance ...................................................... 21
Parasitic Serial Resistance ......................................................... 21
Input EMC Protection ............................................................... 21
Power Supply Decoupling and Filtering.................................. 21
Capacitive Gain Calibration ..................................................... 21
Capacitive System Offset Calibration...................................... 21
Typical Application Diagram.................................................... 22
Outline Dimensions ....................................................................... 23
Ordering Guide .......................................................................... 23
Rev. A | Page 2 of 24




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