Multimodal Sensor Front End
Data Sheet
ADPD4000/ADPD4001
FEATURES
GENERAL DESCRIPTION
Multimodal analog front end
The ADPD4000/ADPD4001 operate as a complete multimodal
sensor front end, stimulating up to eight LEDs and measuring
the return signal on up to eight separate current inputs. Twelve
time slots are available, enabling 12 separate measurements per
sampling period.
The data output and functional configuration utilize an I2C
interface on the ADPD4001 or a serial port interface (SPI) on
the ADPD4000. The control circuitry includes flexible LED
signaling and synchronous detection. The devices use a 1.8 V
analog core and 1.8 V/3.3 V compatible digital input/output (I/O).
8 input channels with multiple operation modes to
accommodate the following measurements: PPG, ECG,
EDA, impedance, and temperature
Dual channel processing with simultaneous sampling
12 programmable time slots for synchronized sensor
measurements
Flexible input multiplexing to support differential and
single-ended sensor measurements
8 LED drivers, 4 of which can be driven simultaneously
Flexible sampling rate from 0.004 Hz to 9 kHz using internal
oscillators
The analog front end (AFE) rejects signal offsets and corruption
from asynchronous modulated interference, typically from
ambient light, eliminating the need for optical filters or externally
controlled dc cancellation circuitry. Multiple operating modes
are provided, enabling the ADPD4000/ ADPD4001 to be a
sensor hub for synchronous measurements of photodiodes,
biopotential electrodes, resistance, capacitance, and temperature
sensors.
On-chip digital filtering
SNR of transmit and receive signal chain: 90 dB
Ambient light rejection: 60 dB up to 1 kHz
400 mA total LED drive current
Total system power dissipation: 50 µW (combined LED and
AFE power), continuous PPG measurement at 75 dB SNR,
25 Hz ODR, 100 nA/mA CTR
SPI and I2C communications supported
256-byte FIFO
The ADPD4000/ADPD4001 are available in a 3.11 mm ×
2.14 mm, 0.4 mm pitch, 33-ball WLCSP and 35-ball WLCSP.
APPLICATIONS
Wearable health and fitness monitors: heart rate monitors
(HRMs), heart rate variability (HRV), stress, blood pressure
estimation, SpO2, hydration, body composition
Industrial monitoring: CO, CO2, smoke, and aerosol detection
Home patient monitoring
FUNCTIONAL BLOCK DIAGRAM
AVDD
DVDD1
DVDD2
IOVDD
LED4B
LED3B
ADPD4000/ADPD4001
LED LEVEL
LED2B
LED1B
LED4A
LED3A
LED2A
LED1A
AND
AGND
DGND
IOGND
LED
MUX CONTROL
DRIVERS
HIGH
FREQUENCY
AND LOW
FREQUENCY
OSCILLATORS
CS
SCLK
MOSI
MISO
LGND
DIGITAL PROCESSING,
INTERFACE AND
TIMING CONTROL,
FIFO, PROGRAM AND
DATA REGISTERS,
COMMUNICATIONS
INTEGRATOR
TIMING
SCL
SDA
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
CH 1 SIGNAL
CONDITIONING
GPIO0
GPIO1
GPIO2
GPIO3
ADC
TIA_VREF
CH 2 SIGNAL
CONDITIONING
VREF
VC1
INTEGRATOR
TIMING
VC1
VC2
VOLTAGE
REFERENCES
VREF
VC2
TIA_VREF
NOTES
V
ICM
1. CS, SCLK, MOSI, AND MISO PINS ARE ON THE ADPD4000.
2. SCL AND SDA PINS ARE ON THE ADPD4001.
3. TIA_VREF IS THE INTERNAL VOLTAGE REFERENCE SIGNAL FOR THE TRANSIMPEDANCE AMPLIFIER.
Figure 1.
Rev. A
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Technical Support
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www.analog.com
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