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AD7746ARUZ-REEL7 Datasheet(PDF) 2 Page - Analog Devices

Part # AD7746ARUZ-REEL7
Description  24-Bit Capacitance-to-Digital Converter with Temperature Sensor
Download  28 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7746ARUZ-REEL7 Datasheet(HTML) 2 Page - Analog Devices

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AD7745/AD7746
Rev. 0 | Page 2 of 28
TABLE OF CONTENTS
Specifications..................................................................................... 3
Timing Specifications....................................................................... 5
Absolute Maximum Ratings............................................................ 6
Pin Configurations and Function Descriptions ........................... 7
Typical Performance Characteristics ............................................. 8
Output Noise and Resolution Specifications .............................. 11
Serial Interface ................................................................................ 12
Read Operation........................................................................... 12
Write Operation.......................................................................... 12
AD7745/AD7746 Reset ............................................................. 13
General Call................................................................................. 13
Register Descriptions ..................................................................... 14
Status Register ............................................................................. 15
Cap Data Register....................................................................... 15
VT Data Register ........................................................................ 15
Cap Set-Up Register ................................................................... 16
VT Set-Up Register .................................................................... 16
EXC Set-Up Register .................................................................. 17
Configuration Register .............................................................. 18
Cap DAC A Register................................................................... 19
Cap DAC B Register................................................................... 19
Cap Offset Calibration Register................................................ 19
Cap Gain Calibration Register.................................................. 19
Volt Gain Calibration Register ................................................. 19
Circuit Description......................................................................... 20
Overview ..................................................................................... 20
Capacitance-to-Digital Converter ........................................... 20
Excitation Source........................................................................ 20
CAPDAC ..................................................................................... 21
Single-Ended Capacitive Input................................................. 21
Differential Capacitive Input .................................................... 21
Parasitic Capacitance to Ground.............................................. 22
Parasitic Resistance to Ground................................................. 22
Parasitic Parallel Resistance ...................................................... 22
Parasitic Serial Resistance ......................................................... 23
Capacitive Gain Calibration ..................................................... 23
Capacitive System Offset Calibration ...................................... 23
Internal Temperature Sensor .................................................... 23
External Temperature Sensor ................................................... 24
Voltage Input............................................................................... 24
VDD Monitor ................................................................................ 24
Typical Application Diagram.................................................... 24
Outline Dimensions ....................................................................... 25
Ordering Guide .......................................................................... 25
REVISION HISTORY
4/05—Revision 0: Initial Version


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