ADZS-AD2428MINI Analog Devices

2 Automotive Audio Bus A B Transceiver AD2420(W)/AD2426(W)/AD2427(W)/AD2428(W)/AD2429(W) 2 2 A B BUS FEATURES A B TRANSCEIVER FEATURES 2 Line topology Configurable A B bus master or slave operation 2 Single master, multiple slave I C interface 2 Up to 15 m between nodes and up to 40 m overall cable 8-bit to 32-bit multichannel I S/TDM interface 2 length (see Table 9) Programmable I S/TDM data rate Communication over distance Up to 32 upstream and 32 downstream channels Synchronous data PDM interface 2 2 Multichannel I S/TDM to I S/TDM Programmable PDM clock rate Synchronous clock, phase aligned in all nodes Up to 4 high dynamic range microphone inputs 2 Low latency slave to slave communication Simultaneous reception of I S data with up to 4 PDM 2 2 Control and status information I C to I C microphones GPIO and interrupt Unique ID register for each transceiver Bus power or local power slave nodes Crossover or straight-through cabling Configurable with SigmaStudio graphical software tool Programmable settings to optimize EMC performance AEC-Q100 qualified for automotive applications 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 VOUT1 VIN VOUT2 BTRXVDD 2 SCL A B BP PLL VREG1 VREG2 TRX B SDA BCM (Towards 2 IRQ/IO0 I C BN Last Slave) ADR1/IO1 ADR2/IO2 SWP DIAGNOSTICS SENSE DTX0/IO3 2 AP A B 2 DTX1/IO4 I S/TDM TRX A ACM DRX0/IO5 PDM (Towards AN DRX1/IO6 Master) PDMCLK/IO7 BCLK SYNC VSSN VSS ATRXVDD Figure 1. Functional Block Diagram 2 2 A B and the A B logo are registered trademarks of Analog Devices, Inc. Rev. C Document Feedback 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106 U.S.A. Specifications subject to change without notice. No license is granted by implication Tel: 781.329.4700 2021 Analog Devices, Inc. All rights reserved. or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com AD2420(W)/AD2426(W)/AD2427(W)/AD2428(W)/AD2429(W) TABLE OF CONTENTS 2 A B Bus Features . 1 ESD Caution 21 2 A B Transceiver Features . 1 Test Circuits and Switching Characteristics . 21 Applications . 1 Output Drive Currents . 21 Table of Contents . 2 Test Conditions 22 Revision History 2 Pin Configuration and Function Descriptions . 24 General Description . 3 Power Analysis 28 2 A B Bus Details 4 Current Flow 28 2 I C Interface 5 VREG1 and VREG2 Output Currents 29 2 I S/TDM Interface 5 Current at VIN (I ) . 30 VIN Pulse Density Modulation (PDM) Interface . 6 Power Dissipation . 30 GPIO Over Distance 6 Resistance Between Nodes . 30 Mailboxes . 6 Voltage Regulator Current in Master Node or Local Powered Slave Node 31 Data Slot Exchange Between Slaves . 6 2 Power Dissipation of A B Bus . 31 Clock Sustain State 6 Power Analysis of Bus Powered System 31 Programmable Settings to Optimize EMC Performance . 6 Supply Voltage . 31 Specifications 8 Reducing Power Consumption . 32 Operating Conditions 8 Thermal Power . 32 Electrical Characteristics . 9 Designer Reference . 33 Power Supply Rejection Ratio (PSRR) 11 V and Considerations for Diodes ..... 33 SENSE Timing Specifications 12 Optional Add On Circuits . 33 Power-Up Sequencing Restrictions . 16 Layout Guidelines . 34 2 A B Bus System Specification . 17 Outline Dimensions 36 PDM Typical Performance Characteristics 18 Automotive Products 37 Absolute Maximum Ratings 20 Ordering Guide . 38 Thermal Characteristics . 20 REVISION HISTORY 7/2021Rev. B to Rev. C Removed references to ambient temperature in: Operating Conditions . 8 Automotive Products . 37 Ordering Guide . 38 Added statement on specification applicability to: Operating Conditions . 8 Electrical Characteristics . 9 Timing Specifications . 12 Added I and C specifications to BUSDISC BUSDISC 2 A B Bus System Specification . 17 Updated Figure 39 in Outline Dimensions 36 Changes to the Package Option column in Automotive Products . 37 Rev. C Page 2 of 38 July 2021