Datasheet AD2420(W), AD2426(W), AD2427(W), AD2428(W), AD2429(W) (Analog Devices)

link to page 17
Automotive Audio Bus A2B Transceiver AD2420(W) /AD2426(W) /AD2427(W) /AD2428(W) / AD2429(W) A2B BUS FEATURES A2B TRANSCEIVER FEATURES Line topology Configurable A2B bus master or slave operation Single master, multiple slave I2C interface Up to 15 m between nodes and up to 40 m overall cable 8-bit to 32-bit multichannel I2S/TDM interface length (see Table 9) Programmable I2S/TDM data rate Communication over distance Up to 32 upstream and 32 downstream channels Synchronous data PDM interface Multichannel I2S/TDM to I2S/TDM Programmable PDM clock rate Synchronous clock, phase aligned in all nodes Up to 4 high dynamic range microphone inputs Low latency slave to slave communication Simultaneous reception of I2S data with up to 4 PDM Control and status information I2C to I2C 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 SCL A2B BP SDA PLL VREG1 VREG2 TRX B BCM IRQ/IO0 (Towards I2C BN Last Slave) ADR1/IO1 ADR2/IO2 SWP DIAGNOSTICS SENSE DTX0/IO3 A2B AP DTX1/IO4 I2S/TDM TRX A ACM DRX0/IO5 PDM (Towards AN DRX1/IO6 Master) PDMCLK/IO7 BCLK SYNC VSSN VSS ATRXVDD
Figure 1. Functional Block Diagram A2B and the A2B logo are registered trademarks of Analog Devices, Inc.
Rev. B 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. Specifications subject to change without notice. No license is granted by implication One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106 U.S.A. or otherwise under any patent or patent rights of Analog Devices. Trademarks and Tel: 781.329.4700 ©2020 Analog Devices, Inc. All rights reserved. registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline Automotive Audio Bus A2B Transceiver A2B Bus Features A2B Transceiver Features Applications Table of Contents Revision History General Description A2B Bus Details I2C Interface I2S/TDM Interface I2S Reduced Rate Pulse Density Modulation (PDM) Interface GPIO Over Distance Mailboxes Data Slot Exchange Between Slaves Clock Sustain State Programmable Settings to Optimize EMC Performance Programmable LVDS Transmit Levels Spread-Spectrum Clocking Unique ID Support for Crossover or Straight Through Cabling Data Only and Power Only Bus Operation Specifications Operating Conditions Electrical Characteristics Power Supply Rejection Ratio (PSRR) Timing Specifications Power-Up Sequencing Restrictions A2B Bus System Specification RMS Time Interval Error (TIE) Jitter PDM Typical Performance Characteristics Absolute Maximum Ratings Thermal Characteristics ESD Caution Test Circuits and Switching Characteristics Output Drive Currents Test Conditions Output Enable Time Measurement Output Disable Time Measurement Capacitive Loading Pin Configuration and Function Descriptions Power Analysis Current Flow Constant Current PLL Supply Current VIN Quiescent Current IOVDD Current Peripheral Supply Current Digital Logic Supply Current A2B Bus TX/RX Current LVDS Transmitter and Receiver Supply Currents Downstream/Upstream Activity Level LVDS Transmitter and Receiver Idle Current VREG1 and VREG2 Output Currents Current at VIN (IVIN) Power Dissipation Resistance Between Nodes Voltage Regulator Current in Master Node or Local Powered Slave Node Power Dissipation of A2B Bus Power Analysis of Bus Powered System Supply Voltage Reducing Power Consumption Power-Down Mode Standby Mode Control Mode Thermal Power Designer Reference VSENSE and Considerations for Diodes Optional Add On Circuits Layout Guidelines Outline Dimensions Automotive Products Ordering Guide