ADA4254ACPZ-R7 datasheet(2/59 Pages) AD

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ADA4254

Data Sheet

Rev. B | Page 2 of 59

TABLE OF CONTENTS

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

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

General Description ......................................................................... 1

Simplified Functional Block Diagram ........................................... 1

Companion Products....................................................................... 1

Revision History ............................................................................... 3

Specifications .................................................................................... 4

Timing Specifications .................................................................. 8

Absolute Maximum Ratings ........................................................... 9

Thermal Resistance ...................................................................... 9

ESD Caution.................................................................................. 9

Pin Configurations and Function Descriptions......................... 10

Typical Performance Characteristics........................................... 11

Theory of Operation ...................................................................... 23

Programmable Gain Instrumentation Amplifier .................. 23

Input Multiplexer ....................................................................... 24

EMI Reduction and Internal EMI Filter ................................. 24

Input Amplifier........................................................................... 25

Output Amplifier........................................................................ 25

Power Supplies............................................................................ 26

ESD Map...................................................................................... 26

Output Ripple Calibration Configuration .............................. 27

General-Purpose Inputs/Outputs (GPIOs) ............................ 27

Excitation Currents.................................................................... 27

External Clock Synchronization .............................................. 28

Sequential Chip Select (SCS) .................................................... 28

Gain Error Calibration .............................................................. 30

Wire Break Detection ................................................................ 31

Test Multiplexer ......................................................................... 32

External Mux Control................................................................ 32

Digital Interface .............................................................................. 33

SPI Interface................................................................................ 33

Accessing the ADA4254 Register Map ................................... 33

Checksum Protection ................................................................ 33

CRC Calculation......................................................................... 35

Memory Map Checksum Protection....................................... 35

Read-Only Memory (ROM) Checksum Protection.............. 35

SPI Read/Write Error Detection.............................................. 35

SPI Command Length Error Detection .................................. 35

Applications Information ............................................................. 36

Input and Output Offset Voltage and Noise.......................... 36

ADC Clock Synchronization.................................................... 36

Programmable Logic Controller (PLC) Voltage/Current

Input............................................................................................. 37

3-Wire RTD With Current Excitation.................................... 38

High Rail Current Sensing........................................................ 39

GAIN_MUX Register Details................................................... 42

Software Reset Register (Reset) Details................................... 43

Clock Synchronization Configuration Register (SYNC_CFG)

Details .......................................................................................... 44

Digital Error Register (DIGITAL_ERR) Details.................... 45

Analog Error Register (ANALOG_ERR) Details .................. 46

GPIO Data Register (GPIO_DATA) Details ......................... 47

Internal Mux Control Register (INPUT_MUX) Details ...... 48

Wire Break Detect Register (WB_DETECT) Details............ 49

GPIO Direction Register (GPIO_DIR) Details ..................... 50

Sequential Chip Select Register (SCS) Details........................ 50

Analog Error Mask Register (ANALOG_ERR_DIS) Details ... 51

Digital Error Mask Register (DIGITAL_ERR_DIS) Details..... 52

Special Function Configuration Register (SF_CFG) Details .... 53

Error Configuration Register ................................................... 54

Test Multiplexer Register (TEST_MUX) Details .................. 55

Excitation Current Configuration Register

(EX_CURRENT_CFG) Details ................................................ 56

Gain Calibration Registers (GAIN_CALx) Details ............... 57

Trigger Calibration Register (TRIG_CAL) Details ............... 58

Master Clock Count Register (M_CLK_CNT) Details......... 58

DIE Revision Identification Register (DIE_REV_ID) Details

....................................................................................................... 58

Device Identification Registers (PART_ID) Details ............. 58

Outline Dimensions....................................................................... 59

Ordering Guide .......................................................................... 59

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