EVAL-ADPD1080Z-PRX datasheet, PDF

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EVAL-ADPD1080Z-PRX: DescriptionOptical sensor development tool ADPD1080 Supp board; CategoryEmbedded solution Engineering tools Sensor development tools Optical sensor development tools; File Size978KB，75 Pages; ManufacturerADI; Websitehttps://www.analog.com; Environmental Compliance

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Optical sensor development tool ADPD1080 Supp board

EVAL-ADPD1080Z-PRX Parametric

Parameter Name	Attribute value
Maker	ADI
Product Category	Optical sensor development tools
product	Evaluation Boards
type	Photometric Front End
Tools for assessment	ADPD1080
series	ADPD1080
Factory packaging quantity	1

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Data Sheet

FEATURES

Multifunction photometric front end

Fully integrated AFE, ADC, LED drivers, and timing core

Enables ambient light rejection capability without the need

for photodiode optical filters

Three 370 mA LED peak current drivers

Flexible, multiple, short LED pulses per optical sample

20-bit burst accumulator enabling 20 bits per sample period

On-board sample to sample accumulator, enabling up to

27 bits per data read

Low power operation

SPI, I

C interface, and 1.8 V analog/digital core

Flexible sampling frequency ranging from 0.122 Hz to 2700 Hz

FIFO data operation

Qualified for automotive applications

Photometric Front Ends

ADPD1080/ADPD1081

GENERAL DESCRIPTION

The ADPD1080/ADPD1081 are highly efficient, photometric

front ends, each with an integrated 14-bit analog-to-digital

converter (ADC) and a 20-bit burst accumulator that works

with flexible light emitting diode (LED) drivers. The ADPD1080/

ADPD1081 stimulate an LED and measures the corresponding

optical return signal. The data output and functional configuration

occur over a 1.8 V I

C interface on the ADPD1080 or a serial

port interface (SPI) on the ADPD1081. The control circuitry

includes flexible LED signaling and synchronous detection.

The analog front end (AFE) features rejection of signal offset and

corruption due to modulated interference commonly caused by

ambient light without the need for optical filters or dc cancellation

circuitry that requires external control.

Couple the ADPD1080/ADPD1081 with a low capacitance

photodiode of <100 pF for optimal performance. The ADPD1080/

ADPD1081 can be used with any LED. The ADPD1080 is available

in a 16-ball, 2.46 mm × 1.4 mm WLCSP and a 28-lead, 4 mm ×

4 mm LFCSP. The SPI only version, ADPD1081, is available in a

17-ball, 2.46 mm × 1.4 mm WLCSP.

APPLICATIONS

Wearable health and fitness monitors

Clinical measurements, for example, SpO

Industrial monitoring

Background light measurements

Rev. B

Document Feedback

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Technical Support

www.analog.com

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

ADPD1080/ADPD1081

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications ....................................................................................... 1

General Description ......................................................................... 1

Table of Contents .............................................................................. 2

Revision History ............................................................................... 3

Functional Block Diagrams ............................................................. 4

Specifications..................................................................................... 6

Temperature and Power Specifications ..................................... 6

Performance Specifications ......................................................... 7

Analog Specifications ................................................................... 8

Digital Specifications ................................................................. 10

Timing Specifications ................................................................ 11

Absolute Maximum Ratings .......................................................... 13

Thermal Resistance .................................................................... 13

Recommended Soldering Profile ............................................. 13

ESD Caution ................................................................................ 13

Pin Configurations and Function Descriptions ......................... 14

Typical Performance Characteristics ........................................... 17

Theory of Operation ...................................................................... 19

Introduction ................................................................................ 19

Dual Time Slot Operation ......................................................... 19

Time Slot Switch ......................................................................... 20

Adjustable Sampling Frequency ............................................... 23

State Machine Operation ........................................................... 24

Normal Mode Operation and Data Flow ................................ 24

AFE Operation ............................................................................ 26

AFE Integration Offset Adjustment ......................................... 26

I C Serial Interface...................................................................... 28

SPI Port ........................................................................................ 29

Applications Information .............................................................. 31

Typical Connection Diagram.................................................... 31

Data Sheet

LED Driver Pins and LED Supply Voltage.............................. 32

LED Driver Operation ............................................................... 32

Determining the Average Current ........................................... 33

Determining C

VLED

..................................................................... 33

LED Inductance Considerations .............................................. 34

Recommended Start-Up Sequence .......................................... 34

Reading Data ............................................................................... 34

Clocks and Timing Calibration ................................................ 36

Optional Timing Signals Available on GPIO0 and GPIO1 .. 36

Calculating Current Consumption .......................................... 38

Optimizing SNR per Watt ......................................................... 39

Optimizing Power by Disabling Unused Channels and

Amplifiers .................................................................................... 41

Optimizing Dynamic Range for High Ambient Light

Conditions ................................................................................... 42

TIA ADC Mode .......................................................................... 43

Pulse Connect Mode .................................................................. 46

Synchronous ECG and PPG Measurement Using TIA ADC

Mode ............................................................................................ 46

Float Mode .................................................................................. 47

LED Control Registers ............................................................... 58

AFE Configuration Registers .................................................... 60

Float Mode Registers.................................................................. 64

System Registers ......................................................................... 66

ADC Registers ............................................................................ 71

Data Registers ............................................................................. 72

Required Start-Up Load Procedure ......................................... 72

Outline Dimensions ....................................................................... 73

Ordering Guide .......................................................................... 74

Automotive Products ................................................................. 74

Rev. B | Page 2 of 74

Data Sheet

REVISION HISTORY

10/2018—Rev. A to Rev. B

Changed T

= Full Operating Temperature Range to

= 25°C ........................................................................ Throughout

Changes to Features Section ............................................................ 1

Changes to ADPD1080WBCPZR7 Parameter, Table 1 ............... 6

Deleted Input Capacitance Parameter, Table 4.............................. 8

Changes to Digital Specifications Section....................................10

Changes to Timing Specifications Section...................................11

Changes to SPI Timing Specifications Section ............................12

Change to Calibrating the 32 kHz Clock Section .......................36

Added Improving SNR Using Integrator Chopping Section,

Figure 46, and Table 25; Renumbered Sequentially....................40

Changes to Table 36 ........................................................................54

Changes to Table 39 ........................................................................62

Changes to Table 40 ........................................................................63

Changes to Register 0x58 Description Column, Table 41 .........65

Changes to Ordering Guide ...........................................................74

Added Automotive Products Section ...........................................74

7/2018—Rev. 0 to Rev. A

Added ADPD1081 ............................................................. Universal

Added 28-Lead LFCSP (CP-28-5), ADPD1080 ............. Universal

Added 17-Ball WLCSP (CB-17-1), ADPD1081 ............. Universal

Changes to Features Section and General Description Section ........1

Changes to Figure 1 ...................................................................................... 4

Added Figure 2; Renumbered Sequentially............................................5

Changes to Table 2 ............................................................................ 6

ADPD1080/ADPD1081

Changes to Table 5 .......................................................................... 10

Added SPI Timing Specifications Section, Table 7; Renumbered

Sequentially, SPI Timing Diagram Section, and Figure 4.......... 12

Added Table 9 .................................................................................. 13

Added Figure 6 and Table 12 ......................................................... 14

Added Figure 8 and Table 14 ......................................................... 16

Added Figure 16 .............................................................................. 17

Changes to Introduction Section .................................................. 19

Added ADPD1080 LFCSP Input Configurations Section and

Figure 18 to Figure 21 ..................................................................... 20

Added Figure 22 to Figure 24 and Table 16 ................................. 21

Changes to Data Read Section ...................................................... 25

Added SPI Port Section, Table 20, and Table 21 ......................... 29

Added Figure 33 to Figure 35 ........................................................ 30

Changes to Typical Connection Diagram Section ..................... 31

Added Figure 38 .............................................................................. 31

Added Figure 39 and Table 22 ....................................................... 32

Changes to Protecting Against TIA Saturation in Normal

Operation Section ........................................................................... 42

Change to Hex Addr. 0x08, Reset Column, Table 35 ................. 54

Changes to Table 37 ........................................................................ 60

Changes to Table 41 ........................................................................ 67

Updated Outline Dimensions........................................................ 73

Changes to Ordering Guide ........................................................... 74

1/2018—Revision 0: Initial Version

Rev. B | Page 3 of 74

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