ADFS7124-8BBCPZ datasheet(2/93 Pages) AD

2 / 93 page

Data Sheet

ADFS7124-8

TABLE OF CONTENTS

analog.com

Rev. 0 | 2 of 93

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

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

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

General Description...............................................3

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

Timing Characteristics......................................10

Absolute Maximum Ratings ................................13

Thermal Resistance......................................... 13

ESD Caution.....................................................13

Pin Configuration and Function Descriptions ..... 14

Typical Performance Characteristics................... 17

Terminology......................................................... 26

RMS Noise and Resolution................................. 27

Full Power Mode.............................................. 27

Mid Power Mode.............................................. 30

Low Power Mode..............................................33

Getting Started.................................................... 36

Overview.......................................................... 36

Power Supplies................................................ 37

Digital Communication..................................... 37

Configuration Overview.................................... 39

ADC Circuit Information.......................................46

Analog Input Channel.......................................46

Programmable Gain Amplifier (PGA)............... 47

Reference.........................................................47

Bipolar/Unipolar Configuration......................... 47

Data Output Coding..........................................48

Excitation Currents........................................... 48

Bridge Power-Down Switch..............................48

Logic Outputs................................................... 48

Bias Voltage Generator.................................... 49

Clock................................................................ 49

Power Modes................................................... 49

Standby and Power-Down Modes....................49

Digital Interface................................................ 50

DATA_STATUS.................................................52

Serial Interface Reset (DOUT_RDY_DEL

and CS_EN Bits)............................................ 52

Reset................................................................52

Calibration........................................................ 52

Span and Offset Limits..................................... 53

System Synchronization...................................54

Digital Filter..........................................................55

Sinc4 Filter........................................................55

Sinc3 Filter........................................................57

Fast Settling Mode (Sinc4 + Sinc1 Filter).......... 60

Fast Settling Mode (Sinc3 + Sinc1 Filter).......... 62

Post Filters....................................................... 63

Summary of Filter Options................................66

Diagnostics.......................................................... 68

Signal Chain Check..........................................68

Reference Detect............................................. 68

Calibration, Conversion, and Saturation

Errors..............................................................68

Overvoltage/Undervoltage Detection............... 68

Power Supply Monitors.................................... 69

LDO Monitoring................................................ 69

MCLK Counter..................................................69

SPI SCLK Counter........................................... 70

SPI Read/Write Errors......................................70

SPI_IGNORE Error.......................................... 70

Checksum Protection....................................... 70

Memory Map Checksum Protection................. 70

ROM Checksum Protection..............................71

Burnout Currents..............................................72

Temperature Sensor.........................................72

Grounding and Layout......................................... 73

Applications Information...................................... 74

Temperature Measurement Using a

Thermocouple................................................ 74

Temperature Measurement Using an RTD.......75

Flowmeter.........................................................77

On-Chip Registers............................................... 79

Communications Register................................ 80

Status Register.................................................80

ADC_CONTROL Register................................81

Data Register................................................... 83

IO_CONTROL_1 Register................................83

IO_CONTROL_2 Register................................85

ID Register....................................................... 85

Error Register................................................... 85

ERROR_EN Register....................................... 86

MCLK_COUNT Register.................................. 88

Channel Registers............................................88

Configuration Registers....................................90

Filter Registers................................................. 91

Offset Registers................................................92

Gain Registers..................................................92

Outline Dimensions............................................. 93

Ordering Guide.................................................93

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