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 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

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 sensors

Potentiostat/amperometric/voltammetry/cyclic voltammetry

Bioimpedance applications

Skin impedance

Body impedance

Continuous glucose monitoring

Battery impedance