Overview
The AD5940BCBZ-RL, produced by Analog Devices Inc., is a high precision, low power analog front end (AFE) designed for portable applications requiring advanced electrochemical-based measurement techniques. This device is particularly suited for applications such as electrochemical gas sensing, bioimpedance measurements, and continuous glucose monitoring. The AD5940 features two high precision excitation loops and a common measurement channel, enabling a wide range of measurements including voltage, current, and impedance. It operates from a 2.8 V to 3.6 V supply and is fully specified for an operating temperature range of -40°C to +85°C.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | 56-Ball WLCSP (3.6 mm x 4.2 mm) |
| Supply Voltage | 2.8 V to 3.6 V |
| Input/Output Compliance | 1.82 V |
| Operating Temperature Range | -40°C to +85°C |
| ADC Resolution and Sample Rate | 16-bit, 800 kSPS and 1.6 MSPS options |
| DAC Resolution and Output Range | Dual output DAC: 0.2 V to 2.4 V; 12-bit high speed DAC up to 200 kHz |
| Interface | SPI serial input/output |
| Memory | 6 kB SRAM for data and command FIFO |
| Power Modes | Active, Hibernate, Shutdown, Low Power |
Key Features
- Analog input with 16-bit ADC and options for 800 kSPS and 1.6 MSPS sampling rates
- Voltage, current, and impedance measurement capability
- Internal and external current and voltage channels
- Ultra-low leakage switch matrix and input multiplexer
- Input buffers and programmable gain amplifier
- Dual output voltage DAC and 12-bit high speed DAC
- Low power potentiostat and transimpedance amplifier (TIA)
- Sequencer controlled GPIOs and cycle accurate control of sensor measurement
- Wake-up timer, interrupt controller, and power-on reset
- Hibernate mode with low power DAC and potentiostat amplifier
Applications
- Electrochemical measurements
- Electrochemical gas sensors
- Potentiostat, amperometric, voltammetric, and cyclic voltammetry
- Bioimpedance applications including skin and body impedance measurements
- Continuous glucose monitoring
- Battery impedance measurements
Q & A
- What is the primary function of the AD5940BCBZ-RL? The AD5940BCBZ-RL is a high precision, low power analog front end designed for electrochemical-based measurements.
- What are the operating voltage and temperature ranges of the AD5940BCBZ-RL? The device operates from 2.8 V to 3.6 V and is specified for an operating temperature range of -40°C to +85°C.
- What types of measurements can the AD5940BCBZ-RL perform? It can perform voltage, current, and impedance measurements.
- What is the resolution and sample rate of the ADC in the AD5940BCBZ-RL? The ADC has a resolution of 16 bits and sample rates of 800 kSPS and 1.6 MSPS.
- What types of DACs are included in the AD5940BCBZ-RL? It includes a dual output DAC and a 12-bit high speed DAC capable of generating signals up to 200 kHz.
- How is the AD5940BCBZ-RL controlled? It can be controlled via direct register writes through the SPI interface or using a preprogrammable sequencer.
- What is the purpose of the sequencer in the AD5940BCBZ-RL? The sequencer provides autonomous control of the AFE chip and allows cycle accurate control of multiple external sensor devices.
- What power modes are available in the AD5940BCBZ-RL? The device has Active, Hibernate, Shutdown, and Low Power modes.
- Is the AD5940BCBZ-RL suitable for automotive applications? Yes, it is AEC-Q100 qualified for automotive applications.
- What is the package type of the AD5940BCBZ-RL? It is packaged in a 56-Ball WLCSP (3.6 mm x 4.2 mm).
