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Analog Devices Semiconductor Electronic Components Datasheet

AD5941 Datasheet

High Precision Impedance and Electrochemical Front End

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Data Sheet
High Precision, Impedance, and
Electrochemical Front End
AD5940/AD5941
FEATURES
Analog input
16-bit, 800 kSPS ADC
Voltage, current, and impedance measurement capability
Internal and external current and voltage channels
Ultralow leakage switch matrix and input mux
Input buffers and programmable gain amplifier
Voltage DACs
Dual output voltage DAC with an output range of 0.2 V
to 2.4 V
12-bit VBIAS0 output to bias potentiostat
6-bit VZERO0 output to bias TIA
Ultra low power: 1 µA
1 high speed, 12-bit DAC
Output range to sensor: ±607 mV
Programmable gain amplifier on output with gain
settings of 2 and 0.05
Amplifiers, accelerators, and references
1 low power, low noise potentiostat amplifier suitable for
potentiostat bias in electrochemical sensing
1 low noise, low power TIA, suitable for measuring sensor
current output
50 pA to 3 mA range
Programmable load and gain resistors for sensor output
Analog hardware accelerators
Digital waveform generator
Receive filters
Complex impedance measurement (DFT) engine
1 high speed TIA to handle wide bandwidth input signals
from 0.015 Hz up to 200 kHz
Digital waveform generator for generation of sinusoid and
trapezoid waveforms
2.5 V and 1.82 V internal reference voltage sources
System level power savings
Fast power-up and power-down analog blocks for duty
cycling
Programmable AFE sequencer to minimize workload of
host controller
6 kB SRAM to preprogram AFE sequences
Ultra low power potentiostat channel: 6.5 µA of current
consumption when powered on and all other blocks in
hibernate mode
Smart sensor synchronization and data collection
Cycle accurate control of sensor measurement
Sequencer controlled GPIOs
On-chip peripherals
SPI serial input/output
Wake-up timer
Interrupt controller
Power
2.8 V to 3.6 V supply
1.82 V input/output compliant
Power-on reset
Hibernate mode with low power DAC and potentiostat
amplifier powered up to maintain sensor bias
Package and temperature range
3.6 mm × 4.2 mm, 56-ball WLCSP
7 mm × 7 mm, 48-lead LFCSP
Fully specified for operating temperature range of −40°C
to +85°C
APPLICATIONS
Electrochemical measurements
Electrochemical gas sensors
Potentiostat/amperometric/voltammetry/cyclic
voltammetry
Bioimpedance applications
Skin impedance
Body impedance
Continuous glucose monitoring
Battery impedance
SIMPLIFIED BLOCK DIAGRAM
POTENTIOSTAT:
AMPLIFIER AND DAC
CURRENT
CHANNELS
VOLTAGE
CHANNELS
INTERNAL
CHANNELS
TEMPERATURE
CHANNEL
IMPEDANCE ENGINE
AMPLIFIERS AND DAC
16-BIT
ADC
WAVEFORM
GENERATOR
DFT
ADC FIFO
AND MMR
DIGITAL
FILTERS
DATA FIFO
LDOs
SLEEP/WAKEUP
TIMER
SEQUENCER
VOLTAGE
REFERENCES
GPIOs
INTERRUPTION
GENERATOR
SPI
Figure 1.
Rev. A
Document Feedback
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rights of thirdpartiesthatmay result fromits use. Specifications subject tochangewithout notice.
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Devices.Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2019 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

AD5941 Datasheet

High Precision Impedance and Electrochemical Front End

No Preview Available !

AD5940/AD5941
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Simplified Block Diagram ............................................................... 1
Revision History ............................................................................... 3
Functional Block Diagram .............................................................. 4
General Description ......................................................................... 5
Specifications..................................................................................... 6
ADC RMS Noise Specifications ............................................... 15
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
Low Power DAC ............................................................................. 29
Low Power DAC Switch Options ............................................. 29
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 ................................................................. 35
Low Power TIA ............................................................................... 36
Low Power TIA Protection Diodes .......................................... 36
Using an External RTIA ............................................................... 36
Recommended Switch Settings for Various Operating Modes
....................................................................................................... 36
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 ..................... 44
High Speed DAC Excitation Amplifier ................................... 44
Coupling an AC Signal from the High Speed DAC to the DC
Level Set by the Low Power DAC............................................. 44
Avoiding Incoherency Errors Between Excitation and
Measurement Frequencies During Impedance Measurements
....................................................................................................... 44
High Speed DAC Calibration Options .................................... 45
High Speed DAC Circuit Registers .......................................... 46
High Speed TIA Circuits ............................................................... 49
High Speed TIA Configuration................................................ 49
High Speed TIA Circuit Registers............................................ 51
High Performance ADC Circuit................................................... 53
ADC Circuit Overview.............................................................. 53
ADC Circuit Diagram ............................................................... 53
ADC Circuit Features ................................................................ 54
ADC Circuit Operation............................................................. 54
ADC Transfer Function............................................................. 54
ADC Low Power Current Input Channel ............................... 55
Selecting Inputs to ADC Mux .................................................. 55
ADC Postprocessing .................................................................. 55
Internal Temperature Sensor Channel .................................... 56
Sinc2 Filter (50 Hz/60 Hz Mains Filter).................................. 56
ADC Calibration ........................................................................ 56
ADC Circuit Registers ............................................................... 57
ADC Calibration Registers ....................................................... 63
ADC Digital Postprocessing Registers (Optional) ................ 69
ADC Statistics Registers ............................................................ 70
Programmable Switch Matrix....................................................... 72
Switch Descriptions ................................................................... 72
Recommended Configuration in Hibernate Mode ............... 72
Options for Controlling All Switches ...................................... 72
Programmable Switches Registers ........................................... 75
Precision Voltage References ........................................................ 85
High Power and Low Power Buffer Control Register—
BUFSENCON ............................................................................. 86
Sequencer ........................................................................................ 87
Sequencer Features..................................................................... 87
Sequencer Overview .................................................................. 87
Sequencer Commands............................................................... 87
Sequencer Operation ................................................................. 89
Sequencer and FIFO Registers ................................................. 91
Waveform Generator...................................................................... 96
Rev. A | Page 2 of 135


Part Number AD5941
Description High Precision Impedance and Electrochemical Front End
Maker Analog Devices
Total Page 30 Pages
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