EVAL-AD7747EBZ Analog Devices Inc, EVAL-AD7747EBZ Datasheet - Page 2

• Manufacturer Part Number: EVAL-AD7747EBZ
• Description: 24-Bit Capacitance-to-Digital Converter Eval. Board
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD7747EBZ

• Silicon Manufacturer: Analog Devices
• Application Sub Type: Capacitance-to-Digital Converter
• Kit Application Type: Data Converter
• Silicon Core Number: AD7747
• Sensor Type: Touch, Capacitive
• Interface: I²C
• Voltage - Supply: 2.7 V ~ 5.25 V
• Embedded: No
• Utilized Ic / Part: AD7747
• Kit Contents: Board
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensitivity: -
• Sensing Range: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

AD7747
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Output Noise and Resolution Specifications .............................. 11
Serial Interface ................................................................................ 12
Register Descriptions ..................................................................... 14
REVISION HISTORY
1/07—Revision 0: Initial Version
Timing Specifications .................................................................. 5
ESD Caution.................................................................................. 6
Read Operation........................................................................... 12
Write Operation.......................................................................... 12
AD7747 Reset.............................................................................. 13
General Call................................................................................. 13
Status Register ............................................................................. 15
Cap Data Register....................................................................... 15
VT Data Register ........................................................................ 15
Cap Setup Register ..................................................................... 16
VT Setup Register....................................................................... 16
EXC Setup Register .................................................................... 17
Configuration Register .............................................................. 18
Rev. 0 | Page 2 of 28
Circuit Description......................................................................... 21
Outline Dimensions ....................................................................... 27
Cap DAC A Register .................................................................. 19
Cap DAC B Register................................................................... 19
Cap Offset Calibration Register ............................................... 20
Cap Gain Calibration Register.................................................. 20
Volt Gain Calibration Register ................................................. 20
Overview ..................................................................................... 21
Capacitance-to-Digital Converter............................................ 21
Active AC Shield Concept......................................................... 21
CAPDAC ..................................................................................... 21
Single-Ended Capacitive Configuration ................................. 22
Differential Capacitive Configuration..................................... 22
Parasitic Capacitance ................................................................. 23
Parasitic Resistance .................................................................... 23
Parasitic Serial Resistance ......................................................... 23
Capacitive Gain Calibration ..................................................... 23
Capacitive System Offset Calibration...................................... 24
Internal Temperature Sensor .................................................... 24
External Temperature Sensor ................................................... 24
Voltage Input............................................................................... 25
V
Typical Application Diagram.................................................... 26
Ordering Guide .......................................................................... 27
DD
Monitor ................................................................................ 25