Overview
The AD5941BCPZ-RL7, produced by Analog Devices Inc., is a high precision, low power analog front end (AFE) designed for portable applications that require advanced electrochemical-based measurement techniques. This device is particularly suited for applications such as electrochemical measurements, bioimpedance, and continuous glucose monitoring. It features two high precision excitation loops and a common measurement channel, enabling a wide range of measurements on sensors under test.
Key Specifications
| Parameter | Value | Unit | Comments |
|---|---|---|---|
| Supply Voltage | 2.8 V to 3.6 V | V | |
| Operating Temperature | -40°C to +85°C | °C | |
| Package Type | 48-Lead LFCSP | 7 mm x 7 mm x 0.85 mm w/ EP | |
| ADC Resolution | 16 bits | 800 kSPS and 1.6 MSPS options | |
| Integral Nonlinearity | ±2 LSB typical | ||
| Differential Nonlinearity | ±0.9 LSB typical | At AVDD = DVDD = 2.8 V to 3.6 V | |
| Signal-to-Noise Ratio | 80 dB typical | At PGA gain = 1, 1.5, and 2 | |
| Total Harmonic Distortion | -84 dB typical | At AVDD = DVDD = 2.8 V to 3.6 V | |
| Noise (RMS) | 800 nV/√Hz typical | Chop on, AVDD = DVDD = 2.8 V to 3.6 V | |
| Potentiostat Current Consumption | 6.5 µA | µA | When powered on and all other blocks in hibernate mode |
Key Features
- Two high precision excitation loops: one for low frequency signals (dc to 200 Hz) and one for high frequency signals (up to 200 kHz)
- 16-bit, 800 kSPS, multichannel successive approximation register (SAR) analog-to-digital converter (ADC) with input buffers and a programmable gain amplifier (PGA)
- Ultra low power potentiostat and transimpedance amplifiers (TIAs) for low and high bandwidth signals
- Smart sensor synchronization and data collection capabilities
- Cycle accurate control of sensor measurement using a preprogrammable sequencer
- 6 kB SRAM for deep data FIFO and command FIFO
- SPI serial input/output, wake-up timer, and interrupt controller
- General-purpose inputs/outputs (GPIOs) controlled by the AFE sequencer
- On-chip peripherals including power-on reset and hibernate mode with low power DAC and potentiostat amplifier
Applications
- Electrochemical measurements
- Electrochemical gas sensors
- Potentiostat, amperometric, voltammetry, and cyclic voltammetry
- Bioimpedance applications: skin impedance, body impedance
- Continuous glucose monitoring
- Battery impedance measurements
- AEC-Q100 qualified for automotive applications
Q & A
- What is the primary function of the AD5941BCPZ-RL7?
The AD5941BCPZ-RL7 is a high precision, low power analog front end (AFE) designed for portable applications requiring advanced electrochemical-based measurement techniques.
- What are the key components of the AD5941's measurement system?
The device features two high precision excitation loops and a common measurement channel, including a 16-bit ADC, ultra low power potentiostat, and transimpedance amplifiers.
- What is the operating temperature range of the AD5941BCPZ-RL7?
The operating temperature range is -40°C to +85°C, with the AD5941W variant specified up to +105°C.
- What types of measurements can the AD5941BCPZ-RL7 perform?
The device can perform voltage, current, and impedance measurements, including electrochemical, bioimpedance, and battery impedance measurements.
- How is the AD5941BCPZ-RL7 controlled?
The device can be controlled via direct register writes through the SPI interface or using a preprogrammable sequencer for autonomous control.
- What is the power consumption of the potentiostat in hibernate mode?
The potentiostat consumes 6.5 µA of current when powered on and all other blocks are in hibernate mode.
- What is the resolution of the ADC in the AD5941BCPZ-RL7?
The ADC has a resolution of 16 bits with options for 800 kSPS and 1.6 MSPS sampling rates.
- Does the AD5941BCPZ-RL7 support GPIOs?
Yes, the device includes general-purpose inputs/outputs (GPIOs) controlled by the AFE sequencer.
- What is the package type and size of the AD5941BCPZ-RL7?
The device is packaged in a 48-lead LFCSP with dimensions of 7 mm x 7 mm x 0.85 mm w/ EP.
- Is the AD5941BCPZ-RL7 qualified for automotive applications?
Yes, the AD5941 is AEC-Q100 qualified for automotive applications.
