AD2428 Transceiver Datasheet

AD2428 Datasheet, PDF, Equivalent


Part Number

AD2428

Description

Automotive Audio Bus A2B Transceiver

Manufacture

Analog Devices

Total Page 30 Pages
Datasheet
Download AD2428 Datasheet


AD2428
Automotive Audio Bus A2B Transceiver
AD2420(W)/AD2426(W)/AD2427(W)/AD2428(W)/AD2429(W)
A2B BUS FEATURES
Line topology
Single master, multiple slave
Up to 15 m between nodes and up to 40 m overall cable
length (see Table 9)
Communication over distance
Synchronous data
Multichannel I2S/TDM to I2S/TDM
Synchronous clock, phase aligned in all nodes
Low latency slave to slave communication
Control and status information I2C to I2C
GPIO and interrupt
Bus power or local power slave nodes
Configurable with SigmaStudio graphical software tool
AEC-Q100 qualified for automotive applications
A2B TRANSCEIVER FEATURES
Configurable A2B bus master or slave operation
I2C interface
8-bit to 32-bit multichannel I2S/TDM interface
Programmable I2S/TDM data rate
Up to 32 upstream and 32 downstream channels
PDM interface
Programmable PDM clock rate
Up to 4 high dynamic range microphone inputs
Simultaneous reception of I2S data with up to 4 PDM
microphones
Unique ID register for each transceiver
Crossover or straight-through cabling
Programmable settings to optimize EMC performance
APPLICATIONS
Audio communication link
Microphone arrays
Beamforming
Hands free and in car communication
Active and road noise cancellation
Audio/video conferencing systems
IOVDD DVDD PLLVDD
SCL
SDA
IRQ/IO0
ADR1/IO1
ADR2/IO2
I2C
PLL
DTX0/IO3
DTX1/IO4
DRX0/IO5
DRX1/IO6
I2S/TDM
PDM
PDMCLK/IO7
BCLK SYNC
VOUT1 VIN VOUT2
VREG1
VREG2
VSSN
VSS
BTRXVDD
A2B
TRX B
(Towards
Last Slave)
DIAGNOSTICS
A2B
TRX A
(Towards
Master)
ATRXVDD
BP
BCM
BN
SWP
SENSE
AP
ACM
AN
Figure 1. Functional Block Diagram
A2B and the A2B logo are registered trademarks of Analog Devices, Inc.
Rev. B
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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.
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Tel: 781.329.4700
©2020 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com

AD2428
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
1/2020—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
Rev. B | Page 2 of 38 | January 2020


Features Automotive Audio Bus A2B Transceiver AD 2420(W)/AD2426(W)/AD2427(W)/AD2428(W)/A D2429(W) A2B BUS FEATURES Line topolog y Single master, multiple slave Up to 1 5 m between nodes and up to 40 m overal l cable length (see Table 9) Communicat ion over distance Synchronous data Mult ichannel I2S/TDM to I2S/TDM Synchronous clock, phase aligned in all nodes Low latency slave to slave communication Co ntrol and status information I2C to I2C GPIO and interrupt Bus power or local power slave nodes Configurable with Sig maStudio graphical software tool AEC-Q1 00 qualified for automotive application s A2B TRANSCEIVER FEATURES Configurabl e A2B bus master or slave operation I2C interface 8-bit to 32-bit multichannel I2S/TDM interface Programmable I2S/TDM data rate Up to 32 upstream and 32 dow nstream channels PDM interface Programm able PDM clock rate Up to 4 high dynami c range microphone inputs Simultaneous reception of I2S data with up to 4 PDM microphones Unique ID register for each transceiver Crossover o.
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