Analog Devices has introduced the ADPD4100 and ADPD4101 front-end multimodal sensors, which boast advanced features catering to a wide range of applications. These sensors operate with dual-channel processing, allowing simultaneous sampling for enhanced efficiency in data collection.
The ADPD4100 and ADPD4101 sensors are designed to function as complete multimodal sensor front ends, capable of driving up to eight LEDs and capturing the return signal on up to eight separate current inputs. With twelve time slots available, these sensors enable the acquisition of twelve distinct measurements during each sampling period, ensuring comprehensive data capture.
In terms of interface options, the ADPD4101 supports data output and functional configuration through an I2C interface, while the ADPD4100 utilizes a serial port interface (SPI). Both devices incorporate control circuitry with flexible LED signaling and synchronous detection mechanisms. Moreover, they feature a 1.8 V analog core and support 1.8 V/3.3 V compatible digital input/output (I/O), enhancing compatibility with various systems.
One standout feature of the analog front end (AFE) in these sensors is its ability to reject signal offsets and interference from asynchronous modulated sources such as ambient light. This capability eliminates the need for optical filters or externally controlled DC cancellation circuitry, simplifying system design and improving overall performance.
The ADPD4100 and ADPD4101 offer multiple operating modes, making them versatile sensor hubs for synchronous measurements across a spectrum of parameters including photodiodes, biopotential electrodes, resistance, capacitance, and temperature sensors. These sensors support diverse sensor measurements like photoplethysmography (PPG), electrocardiography (ECG), electrodermal activity (EDA), impedance, capacitance, temperature, gas detection, smoke detection, and aerosol detection. Such versatility enables their application in various industries such as healthcare, industrial processes, and consumer electronics.
Physically, the ADPD4100 and ADPD4101 are compact in size, available in a 3.11 mm × 2.14 mm package with a 0.4 mm pitch and 33-ball or 35-ball WLCSP configurations. This compact form factor enhances their suitability for integration into small-scale devices and systems where space is limited.
In conclusion, Analog Devices' ADPD4100 and ADPD4101 front-end multimodal sensors offer a sophisticated solution for diverse applications requiring precise and synchronized data acquisition. With their advanced features, compact design, and broad compatibility, these sensors are poised to drive innovation across healthcare, industrial, and consumer sectors.
Multimodal analog front-end
8 input channels with multiple operation modes for various sensor measurements
Dual-channel processing with simultaneous sampling
12 programmable time slots for synchronized sensor measurements
Flexible sampling rate from 0.004 Hz to 9 kHz using internal oscillators
On-chip digital filtering
SNR of transmit and receive signal chain: 100 dB
AC ambient light rejection: 60 dB up to 1 kHz
400 mA total LED peak drive current
Total system power dissipation: 30 µW (combined LED and AFE power), continuous PPG measurement at 75 dB SNR, 25 Hz ODR, 100 nA/mA CTR
I2C communications supported
512 byte FIFO size
Flexible input multiplexing to support differential and single-ended sensor measurements
8 LED drivers, 4 of which can be driven simultaneously
Wearable health and fitness monitors
Heart rate monitors (HRMs)
Heart rate variability (HRV)
Stress
Blood pressure estimation
SpO2
Hydration
Body composition
Home patient monitoring
Industrial monitoring
CO
CO2
Smoke
Aerosol detection
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