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AD7124-8BCPZ Fiches technique(PDF) 2 Page - Analog Devices

No de pièce AD7124-8BCPZ
Description  8-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference
Download  91 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD7124-8BCPZ Fiches technique(HTML) 2 Page - Analog Devices

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AD7124-8
Data Sheet
Rev. B | Page 2 of 91
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 3
General Description ......................................................................... 4
Specifications..................................................................................... 5
Timing Characteristics .............................................................. 10
Absolute Maximum Ratings.......................................................... 13
Thermal Resistance .................................................................... 13
ESD Caution................................................................................ 13
Pin Configuration and Function Descriptions........................... 14
Terminology .................................................................................... 17
Typical Performance Characteristics ........................................... 18
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.............................................................. 44
Analog Input Channel ............................................................... 44
Programmable Gain Array (PGA)........................................... 45
Reference ..................................................................................... 45
Bipolar/Unipolar Configuration .............................................. 46
Data Output Coding .................................................................. 46
Excitation Currents .................................................................... 46
Bridge Power-Down Switch ...................................................... 46
Logic Outputs.............................................................................. 47
Bias Voltage Generator .............................................................. 47
Clock ............................................................................................ 47
Power Modes............................................................................... 47
Standby and Power-Down Modes............................................ 48
Digital Interface .......................................................................... 48
DATA_STATUS.......................................................................... 50
Serial Interface Reset (DOUT_RDY_DEL and CS_EN Bits)50
Reset ............................................................................................. 50
Calibration................................................................................... 51
Span and Offset Limits .............................................................. 52
System Synchronization ............................................................ 52
Digital Filter .................................................................................... 53
Sinc4 Filter ................................................................................... 53
Sinc3 Filter ................................................................................... 55
Fast Settling Mode (Sinc4 + Sinc1Filter).................................. 57
Fast Settling Mode (Sinc3 + Sinc1Filter).................................. 59
Post Filters ................................................................................... 61
Summary of Filter Options ....................................................... 64
Diagnostics...................................................................................... 65
Signal Chain Check.................................................................... 65
Reference Detect......................................................................... 65
Calibration, Conversion, and Saturation Errors .................... 65
Overvoltage/Undervoltage Detection ..................................... 65
Power Supply Monitors ............................................................. 66
LDO Monitoring ........................................................................ 66
MCLK Counter........................................................................... 66
SPI SCLK Counter...................................................................... 66
SPI Read/Write Errors ............................................................... 67
SPI_IGNORE Error ................................................................... 67
Checksum Protection ................................................................ 67
Memory Map Checksum Protection ....................................... 67
Burnout Currents ....................................................................... 69
Temperature Sensor ................................................................... 69
Grounding and Layout .................................................................. 70
Applications Information .............................................................. 71
Temperature Measurement Using a Thermocouple.............. 71
Temperature Measurement Using an RTD............................. 72
Flowmeter.................................................................................... 74
On-Chip Registers.......................................................................... 76
Communications Register......................................................... 77
Status Register............................................................................. 77
ADC_CONTROL Register ....................................................... 78
Data Register............................................................................... 80
IO_CONTROL_1 Register........................................................ 80
IO_CONTROL_2 Register........................................................ 82
ID Register................................................................................... 83
Error Register.............................................................................. 83
ERROR_EN Register ................................................................. 84
MCLK_COUNT Register.......................................................... 85


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