AD5940 datasheet(2/143 Pages) AD

2 / 143 page

Data Sheet

AD5940/AD5941

TABLE OF CONTENTS

analog.com

Rev. D | 2 of 143

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

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

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

Functional Block Diagram......................................5

General Description...............................................6

Specifications........................................................ 7

ADC RMS Noise Specifications....................... 16

SPI Timing Specifications.................................17

Absolute Maximum Ratings.................................18

Thermal Resistance......................................... 18

ESD Caution.....................................................18

Pin Configuration and Function Descriptions...... 19

Typical Performance Characteristics................... 22

Reference Test Circuit...................................... 24

Theory of Operation.............................................25

Configuration Registers....................................25

Silicon Identification.............................................28

Identification Registers..................................... 28

System Initialization.............................................29

Low Power DAC.................................................. 30

Low Power DAC Switch Options...................... 30

Relationship Between the 12-Bit and 6-Bit

Outputs...........................................................31

Low Power DAC Use Cases............................ 31

Low Power DAC Circuit Registers....................32

Low Power Potentiostat.......................................36

Low Power TIA.................................................... 37

Low Power TIA Protection Diodes....................37

Using an External RTIA..................................... 37

Recommended Switch Settings for Various

Operating Modes............................................37

Low Power TIA Circuits Registers....................39

High Speed DAC Circuits.................................... 43

High Speed DAC Output Signal Generation.... 43

Power Modes of the High Speed DAC Core.... 43

High Speed DAC Filter Options........................43

High Speed DAC Output Attenuation Options..45

High Speed DAC Excitation Amplifier.............. 45

Coupling an AC Signal from the High Speed

DAC to the DC Level Set by the Low

Power DAC.....................................................45

Avoiding Incoherency Errors Between

Excitation and Measurement Frequencies

During Impedance Measurements................. 45

High Speed DAC Calibration Options.............. 46

High Speed DAC Circuit Registers...................47

High Speed TIA Circuits...................................... 50

High Speed TIA Configuration..........................50

High Speed TIA Circuit Registers.....................52

High Performance ADC Circuit............................54

ADC Circuit Overview.......................................54

ADC Circuit Diagram........................................ 54

ADC Circuit Features....................................... 55

ADC Circuit Operation......................................55

ADC Transfer Function.....................................55

ADC Low Power Current Input Channel...........56

Selecting Inputs to ADC Mux........................... 56

ADC Postprocessing........................................ 57

Internal Temperature Sensor Channel............. 57

50 Hz/60 Hz Mains Rejection Filter.................. 57

ADC Calibration................................................57

ADC Circuit Registers...................................... 58

ADC Calibration Registers............................... 64

ADC Digital Postprocessing Registers

(Optional)........................................................71

ADC Statistics Registers.................................. 72

Programmable Switch Matrix...............................74

Switch Descriptions.......................................... 74

Recommended Configuration in Hibernate

Mode.............................................................. 74

Options for Controlling All Switches................. 74

Programmable Switches Registers.................. 76

Precision Voltage References............................. 87

High Power and Low Power Buffer Control

Sequencer........................................................... 89

Sequencer Features.........................................89

Sequencer Overview........................................ 89

Sequencer Commands.....................................89

Sequencer Operation....................................... 91

Sequencer and FIFO Registers........................93

Waveform Generator........................................... 99

Waveform Generator Features.........................99

Waveform Generator Operation....................... 99

Using the Waveform Generator with the

Low Power DAC............................................. 99

Waveform Generator Registers........................99

SPI Interface......................................................104

Overview........................................................ 104

SPI Pins..........................................................104

SPI Operation.................................................104

Command Byte...............................................104

Writing to and Reading from Registers.......... 104

Reading Data from the Data FIFO................. 104

ECC for DATA FIFO...........................................106

ECC Algorithm................................................106

Sleep and Wake-Up Timer................................ 107

Sleep and Wake-Up Timer Features.............. 107

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