AD2428W datasheet(2/38 Pages) AD

2 / 38 page

Rev. B

Page 2 of 38

January 2020

AD2420(W)/AD2426(W)/AD2427(W)/AD2428(W)/AD2429(W)

TABLE OF CONTENTS

A2B Bus Features ..................................................... 1

A2B Transceiver Features ........................................... 1

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

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

Revision History ...................................................... 2

General Description ................................................. 3

A2B Bus Details .................................................... 4

I2C Interface ........................................................ 5

I2S/TDM Interface ................................................ 5

Pulse Density Modulation (PDM) Interface ................. 6

GPIO Over Distance .............................................. 6

Mailboxes ........................................................... 6

Data Slot Exchange Between Slaves ........................... 6

Clock Sustain State ................................................ 6

Programmable Settings to Optimize EMC 

Performance ..................................................... 6

Specifications .......................................................... 8

Operating Conditions ............................................ 8

Electrical Characteristics ......................................... 9

Power Supply Rejection Ratio (PSRR) ...................... 11

Timing Specifications .......................................... 12

Power-Up Sequencing Restrictions ......................... 16

A2B Bus System Specification ................................. 17

PDM Typical Performance Characteristics ................ 18

Absolute Maximum Ratings .................................. 20

Thermal Characteristics ....................................... 20

ESD Caution ...................................................... 21

Test Circuits and Switching Characteristics ............... 21

Output Drive Currents ......................................... 21

Test Conditions .................................................. 22

Pin Configuration and Function Descriptions ............... 24

Power Analysis ...................................................... 28

Current Flow ...................................................... 28

VREG1 and VREG2 Output Currents ...................... 29

Current at VIN (IVIN) ......................................... 30

Power Dissipation ............................................... 30

Resistance Between Nodes ..................................... 30

Voltage Regulator Current in Master Node or Local 

Powered Slave Node .......................................... 31

Power Dissipation of A2B Bus ................................. 31

Power Analysis of Bus Powered System .................... 31

Supply Voltage ................................................... 31

Reducing Power Consumption ............................... 32

Power Estimation Example .................................... 32

Thermal Power ................................................... 35

Designer Reference ................................................. 36

VSENSE and Considerations for Diodes ................... 36

Optional Add On Circuits ..................................... 36

Layout Guidelines ............................................... 37

Outline Dimensions ................................................ 39

Automotive Products .............................................. 40

Ordering Guide ..................................................... 41

REVISION HISTORY

1/20

20—Rev. A to Rev. B

Updated All Products to Released Status

. . . . . . . Throughout

Deleted Product Status Table

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Changes to Automotive Products ................................ 37

Changes to Ordering Guide ....................................... 38

Deleted Pending Products Table.................................. 39

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