LTC2995 datasheet(2/90 Pages) AD

2 / 90 page

LTM2985

Rev. 0

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TABLE OF CONTENTS

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 .................................................................................................. 5

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

Digital Inputs and Digital Outputs.............................................................................................. 6

Isolation Characteristics......................................................................................................... 6

LTM2985 EEPROM Characteristics............................................................................................. 7

Typical Performance Characteristics .......................................................................................... 8

Pin Functions .....................................................................................................................11

Block Diagram....................................................................................................................12

Test Circuits ......................................................................................................................13

Timing Diagram..................................................................................................................13

Overview ..........................................................................................................................14

Applications Information .......................................................................................................18

EEPROM Overview................................................................................................................................................ 24

EEPROM Read/Write Validation ............................................................................................................................ 24

EEPROM Write Operation ..................................................................................................................................... 24

EEPROM Read Operation...................................................................................................................................... 25

Thermocouple Measurements .............................................................................................................................. 26

Diode Measurements............................................................................................................................................ 29

RTD Measurements .............................................................................................................................................. 33

Thermistor Measurements.................................................................................................................................... 52

Global Configuration Register............................................................................................................................... 61

Input Overvoltage Protection – Overview.............................................................................................................. 61

Active Analog Temperature Sensors ..................................................................................................................... 67

Direct ADC Measurements.................................................................................................................................... 71

Supplemental Information......................................................................................................76

2- and 3-Cycle Conversion Modes........................................................................................................................ 76

Running Conversions Consecutively on Multiple Channels................................................................................... 76

Entering/Exiting Sleep Mode................................................................................................................................. 77

MUX Configuration Delay...................................................................................................................................... 77

Reference Considerations..................................................................................................................................... 77

Custom Thermocouples.........................................................................................................78

Custom RTDs .....................................................................................................................81

Custom Thermistors .............................................................................................................84

Package Description ............................................................................................................89

Typical Application ..............................................................................................................90

Related Parts .....................................................................................................................90

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