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AD5940 Datasheet(PDF) 1 Page - Analog Devices |
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AD5940 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 143 page  Data Sheet AD5940/AD5941 High Precision, Impedance, and Electrochemical Front End Rev. D DOCUMENT FEEDBACK TECHNICAL SUPPORT Information furnished by Analog Devices is believed to be accurate and reliable "as is". However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. FEATURES ► Analog input ► 16-bit ADC with both 800 kSPS and 1.6 MSPS options ► 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 from high-speed DAC (HSDAC): ±607 mV ► Programmable gain amplifier on HSDAC 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 con- sumption 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 amplifi- er powered up to maintain sensor bias ► Package and temperature range ► AD5940: 3.6 mm × 4.2 mm, 56-ball WLCSP ► AD5941: 7 mm × 7 mm, 48-lead LFCSP ► AD5940 and AD5941 fully specified for operating temperature range of −40°C to +85°C ► AD5941W fully specified for operating temperature range of −40°C to +105°C ► AEC-Q100 qualified for automotive applications APPLICATIONS ► Electrochemical measurements ► Electrochemical gas sensor measurements ► Potentiostat/amperometric/voltammetry/cyclic voltammetry ► Bioimpedance applications ► Skin impedance ► Body impedance ► Continuous glucose monitoring ► Battery impedance SIMPLIFIED BLOCK DIAGRAM Figure 1. |
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