LTC2984 datasheet(2/78 Pages) AD

2 / 78 page

LTC2984

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Features............................................................................................................................ 1

Applications ....................................................................................................................... 1

Typical Application ............................................................................................................... 1

Description......................................................................................................................... 1

Absolute Maximum Ratings..................................................................................................... 3

Order Information................................................................................................................. 3

Pin Configuration ................................................................................................................. 3

Complete System Electrical Characteristics.................................................................................. 4

ADC Electrical Characteristics .................................................................................................. 4

Reference Electrical Characteristics........................................................................................... 5

Digital Inputs and Digital Outputs.............................................................................................. 5

EEPROM Characteristics......................................................................................................... 6

Typical Performance Characteristics .......................................................................................... 7

Pin Functions .....................................................................................................................10

Block Diagram....................................................................................................................11

Test Circuits ......................................................................................................................12

Timing Diagram..................................................................................................................12

Overview ..........................................................................................................................13

Applications Information .......................................................................................................17

EEPROM Overview................................................................................................................................................ 23

EEPROM Read/Write Validation ............................................................................................................................ 23

EEPROM Write Operation ..................................................................................................................................... 23

EEPROM Read Operation...................................................................................................................................... 24

Thermocouple Measurements .............................................................................................................................. 25

Diode Measurements............................................................................................................................................ 28

RTD Measurements .............................................................................................................................................. 32

Thermistor Measurements.................................................................................................................................... 50

Supplemental Information......................................................................................................61

Direct ADC Measurements.................................................................................................................................... 61

Fault Protection and Anti-Aliasing......................................................................................................................... 63

2- and 3-Cycle Conversion Modes........................................................................................................................ 63

Running Conversions Consecutively on Multiple Channels................................................................................... 64

Entering/Exiting Sleep Mode................................................................................................................................. 64

MUX Configuration Delay...................................................................................................................................... 64

Global Configuration Register............................................................................................................................... 65

Reference Considerations..................................................................................................................................... 65

Custom Thermocouples.........................................................................................................65

Custom RTDs .....................................................................................................................68

Custom Thermistors .............................................................................................................71

Package Description ............................................................................................................76

Revision History .................................................................................................................77

Typical Application ..............................................................................................................78

Related Parts .....................................................................................................................78

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