ADPD4001 Front End Datasheet

ADPD4001 Datasheet, PDF, Equivalent


Part Number

ADPD4001

Description

Multimodal Sensor Front End

Manufacture

Analog Devices

Total Page 30 Pages
Datasheet
Download ADPD4001 Datasheet


ADPD4001
Data Sheet
Multimodal Sensor Front End
ADPD4000/ADPD4001
FEATURES
GENERAL DESCRIPTION
Multimodal analog front end
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
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
APPLICATIONS
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).
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.
The ADPD4000/ADPD4001 are available in a 3.11 mm ×
2.14 mm, 0.4 mm pitch, 33-ball WLCSP and 35-ball WLCSP.
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
LED4B
LED3B
LED2B
LED1B
LED4A
LED3A
LED2A
LED1A
LGND
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
LED
DRIVERS
INTEGRATOR
TIMING
CH 1 SIGNAL
CONDITIONING
TIA_VREF
CH 2 SIGNAL
CONDITIONING
LED LEVEL
AND
MUX CONTROL
ADPD4000/ADPD4001
HIGH
FREQUENCY
AND LOW
FREQUENCY
OSCILLATORS
ADC
DIGITAL PROCESSING,
INTERFACE AND
TIMING CONTROL,
FIFO, PROGRAM AND
DATA REGISTERS,
COMMUNICATIONS
AVDD
DVDD1
DVDD2
IOVDD
AGND
DGND
IOGND
CS
SCLK
MOSI
MISO
SCL
SDA
GPIO0
GPIO1
GPIO2
GPIO3
VC1
VC2
INTEGRATOR
TIMING
VREF
VC1
VC2
VOLTAGE
REFERENCES
VREF
TIA_VREF
NOTES
1. CS, SCLK, MOSI, AND MISO PINS ARE ON THE ADPD4000.
VICM
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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ADPD4001
ADPD4000/ADPD4001
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Temperature and Power Specifications ..................................... 3
Performance Specifications......................................................... 3
Digital Specifications ................................................................... 5
Timing Specifications .................................................................. 6
Absolute Maximum Ratings............................................................ 8
Thermal Resistance ...................................................................... 8
Recommended Soldering Profile ............................................... 8
ESD Caution.................................................................................. 8
Pin Configurations and Function Descriptions ........................... 9
Typical Performance Characteristics ........................................... 13
Theory of Operation ...................................................................... 15
Introduction ................................................................................ 15
Analog Signal Path ..................................................................... 15
LED Drivers ................................................................................ 16
Determining CVLED...................................................................... 17
Datapath, Decimation, and FIFO............................................. 17
Clocking....................................................................................... 19
Time Stamp Operation .............................................................. 19
Low Frequency Oscillator Calibration .................................... 20
High Frequency Oscillator Calibration ................................... 20
REVISION HISTORY
6/2019—Revision A: Initial Version
Data Sheet
Time Slot Operation .................................................................. 20
Execution Modes........................................................................ 21
Host Interface.............................................................................. 22
Applications Information .............................................................. 25
Operating Mode Overview ....................................................... 25
Single Integration Mode ............................................................ 25
Multiple Integration Mode........................................................ 33
Digital Integration Mode........................................................... 34
TIA ADC Mode.......................................................................... 36
Register Map ................................................................................... 38
Register Details ............................................................................... 57
Global Configuration Registers................................................ 57
Interrupt Status and Control Registers.................................... 59
Threshold Setup and Control Registers .................................. 66
Clock and Timestamp Setup and Control Registers.............. 67
System Registers ......................................................................... 68
I/O Setup and Control Registers .............................................. 69
Time Slot Configuration Registers........................................... 72
AFE Timing Setup Registers..................................................... 76
LED Control and Timing Registers ......................................... 78
ADC Offset Registers................................................................. 79
Output Data Registers ............................................................... 79
Outline Dimensions ....................................................................... 82
Ordering Guide .......................................................................... 82
Rev. A | Page 2 of 82


Features Data Sheet Multimodal Sensor Front End ADPD4000/ADPD4001 FEATURES GENERAL DE SCRIPTION Multimodal analog front end 8 input channels with multiple operatio n modes to accommodate the following me asurements: PPG, ECG, EDA, impedance, a nd temperature Dual channel processing with simultaneous sampling 12 programma ble time slots for synchronized sensor measurements Flexible input multiplexin g to support differential and single-en ded sensor measurements 8 LED drivers, 4 of which can be driven simultaneously Flexible sampling rate from 0.004 Hz t o 9 kHz using internal oscillators On-c hip digital filtering SNR of transmit a nd 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 LE D and AFE power), continuous PPG measur ement at 75 dB SNR, 25 Hz ODR, 100 nA/m A CTR SPI and I2C communications suppor ted 256-byte FIFO APPLICATIONS The ADP D4000/ADPD4001 operate as a complete multimodal sensor front end.
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