Analog Devices Inc. ADPD7000 Multimodal Sensor Analog Front End

Analog Devices Inc. ADPD7000 Multimodal Sensor Analog Front End can be used for measuring vital signals. Analog Devices Inc. ADPD7000 features an optical channel that is a transceiver, with up to eight LEDs stimulating and measuring return signals on four current inputs. The signal chain rejects offsets and interference, eliminating the need for optical filters or external DC cancellation circuitry. The ECG signal acquisition ensures low-noise, diagnostic-level measurements amidst various interferers, featuring a driven reference for common-mode rejection and lead-off detection for fallen electrodes.

Features

Multimodal analog front-end
Optical channel
- 4 input channels with multiple operation modes for various sensor measurements
- 4-channel processing with simultaneous sampling
- 12 programmable time slots for synchronized sensor measurements
- Flexible input multiplexing to support single-ended sensor measurements
- 8 LED drivers, 2 of which can be driven simultaneously
- Flexible sampling rate from 0.004Hz to 9kHz using internal oscillators
- AC ambient light rejection: 78dB up to 100Hz
- 400mA total LED peak drive current
- Individual ambient cancellation DAC at TIA input with 9-bit control up to 300μA
- Individual LED DC cancellation DAC at TIA input with 7-bit control up to 190μA
ECG channel
- <1µV RMS RTI noise at diagnosis bandwidth
- High input impedance 20GΩ
- Accepts up to ±1.2V of DC differential input range
- CMRR: 115dB
- Flexible 4-electrode configurations to support various applications
- Both AC lead-off detection and DC lead-off detection
- Support always on, low power, lead on detection

BIA channel
- Low power, high accuracy excitation path
- Configurable excitation frequency up to 250kHz
- Sine wave excitation with a 12-bit DAC
- High accuracy with large imbalance contact impedance ≤20kΩ
- Configurable receive filters with low noise design
- Complex impedance measurement engine
- Integrated current-limit resistors
EDA channel
- Support both voltage excitation and current excitation
- 10kΩ to 100MΩ measurement range with 1nS resolution
- DFT and decimation for high-accuracy measurement result
- SPI communications supported
- 704-byte FIFO

Applications

Wearable health and fitness monitors: heart rate, heart rate variability, saturation level of pulse oxygen, body impedance analysis, hydration analysis, and cuff-less noninvasive blood pressure

Clinical patient monitors: small bed-side patient, home portable patient, and small remote patient
Industrial monitoring: particle, aerosol, and gas detection
Conductivity detection

Analog Devices Inc. ADPD7000 Multimodal Sensor Analog Front End

Features

Applications

Block Diagram

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