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Features
- Line topology
- Single main node, multiple subordinate nodes
- Up to 15 m between nodes and up to 40 m overall cable length
- Communication over distance
- Synchronous data
- Multichannel I2S/TDM to I2S/TDM
- Synchronous clock, phase aligned in all nodes
- Low latency node to node communication
- Control and status information I2C to I2C
- GPIO and interrupt
- Synchronous data
- Bus power or local power subordinate nodes
- Configurable with SigmaStudio/SigmaStudio+ graphical software tool
- AEC-Q100 qualified for automotive applications
- Configurable A2B bus main node or subordinate node
- Programmable via 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
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The Automotive Audio Bus (A2B®) provides a multichannel, I2S/TDM link over distances of up to 15 m between nodes. It embeds bidirectional synchronous pulse-code modulation (PCM) data (for example, digital audio), clock, and synchronization signals onto a single differential wire pair. A2B supports a direct point to point connection and allows multiple, daisy-chained nodes at different locations to contribute and/or consume time division multiplexed (TDM) channel content.
A2B is a single main node, multiple subordinate node system where the transceiver at the host controller is the main node. The main node generates clock, synchronization, and framing for all subordinate nodes. The main A2B transceiver is programmable over a control port (I2C) for configuration and read back. An extension of the control port protocol is embedded in the A2B data stream, which allows direct access of registers and status information on subordinate transceivers, as well as I2C to I2C communication over distance.
The transceiver can connect directly to general-purpose digital signal processors (DSPs), field-programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), microphones, analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and codecs through a multichannel I2S/TDM interface. It also provides a pulse density modulation (PDM) interface for direct connection of up to four PDM digital microphones.
Finally, the transceiver also supports an A2B bus powering feature, where the main node supplies voltage and current to the subordinate nodes over the same daisy-chained, twisted pair wire cable as used for the communication link.
| Feature | AD2420 | AD2426 | AD2427 | AD2428 | AD2429 |
| Main node capable | No | No | No | Yes | Yes |
| Number of subordinate nodes discoverable1 | N/A | N/A | N/A | Up to 10 | Up to 2 |
| Functional TRX blocks | A only | A only | A + B | A + B | B only |
| I2S/TDM support | No | No | No | Yes | Yes |
| PDM microphone inputs | 2 mics2 | 4 mics | 4 mics | 4 mics | 4 mics |
| Max node to node cable length | 5 m | 15 m | 15 m | 15 m | 5 m |
1 N/A means not applicable.
2 PDM microphones must be connected to the DRX0/IO5 pin.
APPLICATIONS
- Audio communication link
- Microphone arrays
- Beamforming
- Hands free and in car communication
- Active and road noise cancellation
- Audio/video conferencing systems
Please contact your local ADI sales office or authorized ADI product distributor to receive additional product information and technical support.
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AD2427
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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
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Aug 29, 2024
- 24_0206
Qualification of Alternate Wafer Fab for TSMC 0.18um 40V BCDMOS Process
Jul 5, 2022
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Qualification of an Alternate Adhesive Material and Molding Compound for Select LFCSP Packages
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Qualification of Alternate Wafer Fab for TSMC 0.18um 40V BCDMOS Process
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Qualification of an Alternate Adhesive Material and Molding Compound for Select LFCSP Packages
Software & Part Ecosystem
Software Development Tools
SigmaStudio®
Graphical development tool for programming, development, and tuning software for ADI DSP audio processors and A2B® transceivers.
A2B® Software
A2B network design tool and embedded software stack that allows audio network designers to graphically design an A2B network and deploy it into an embedded platform.
SigmaStudio®+
Looking for Evaluation Software? You can find it here
Evaluation Kits 7
EVAL-AD2428WG1BZ
Local-Power A2B® Subordinate Node (I2S/TDM, No PDM Mics)
Features and Benefits
- AD2428W Automotive Audio Bus A2B® Transceiver
- A2B subordinate operation
- Multichannel I2S/TDM interface
- Locally powered
- LT3505 - 1.2 A, Step-Down Switching Regulator
- LT1965 - 1.1 A, Low Noise, Low Dropout Linear Regulator
- ADAU1761 SigmaDSP® Stereo, Low Power, 96 kHz, 24-Bit Audio Codec with Integrated PLL
- EEPROM
- Power, Status, GPIO, and Interrupt LEDs
- Pushbutton Interrupt Generation
Please contact your local ADI sales office or authorized ADI product distributor to receive additional product information and technical support.
Product Detail
An Automotive Audio Bus (A2B®) system consists of a single main node and at least one subordinate node, where the transceiver at the host controller is the main node. The main transceiver generates clock, synchronization, and framing for all subordinate nodes and is programmable over a control bus (I2C) for configuration and readback. An extension of this control bus is embedded in the A2B data stream, which enables the host to directly access subordinate transceiver registers and any I2C-connected peripherals on subordinate nodes. Transceivers can connect directly to PDM microphones and to numerous peripherals via I2C and a multichannel I2S/TDM interface. Finally, the transceiver also supports an A2B bus powering feature, where the main node supplies voltage and current to the subordinate nodes over the same daisy-chained, twisted pair wire cable as used for the communication link, thus eliminating the need for a power supply on bus-powered subordinate nodes. Due to the numerous configurations that are possible for a given A2B system, there are several evaluation platforms that can be used in combination to verify system operation, as summarized in the table below.
| A2B Evaluation Board | Main/Subordinate | Power Supply |
I2S/TDM | PDM Mics |
| EVAL-AD2428WD1BZ | Main/Subordinate | Local | Yes | 3 |
| EVAL-AD2428WB1BZ | Subordinate | Bus | Yes | 2 |
| EVAL-AD2428WC1BZ | Subordinate | Bus | No | 4 |
| EVAL-AD2428WG1BZ | Subordinate | Local | Yes | 0 |
| ADZS-AD2428MINI | Main/Subordinate | Local/Bus | Yes | 0 |
Please contact your local ADI sales office or authorized ADI product distributor to receive additional product information and technical support.
EVAL-AD2428WC1BZ
Bus-Powered A2B® Subordinate Node (No I2S/TDM, 4 PDM Mics)
Features and Benefits
- AD2428W Automotive Audio Bus A2B® Transceiver
- A2B subordinate operation
- Powered over A2B bus
- Four PDM microphone inputs (INMP621)
- GPIO LED
Please contact your local ADI sales office or authorized ADI product distributor to receive additional product information and technical support.
Product Detail
An Automotive Audio Bus (A2B®) system consists of a single main node and at least one subordinate node, where the transceiver at the host controller is the main node. The main transceiver generates clock, synchronization, and framing for all subordinate nodes and is programmable over a control bus (I2C) for configuration and readback. An extension of this control bus is embedded in the A2B data stream, which enables the host to directly access subordinate transceiver registers and any I2C-connected peripherals on subordinate nodes. Transceivers can connect directly to PDM microphones and to numerous peripherals via I2C and a multichannel I2S/TDM interface. Finally, the transceiver also supports an A2B bus powering feature, where the main node supplies voltage and current to the subordinate nodes over the same daisy-chained, twisted pair wire cable as used for the communication link, thus eliminating the need for a power supply on bus-powered subordinate nodes. Due to the numerous configurations that are possible for a given A2B system, there are several evaluation platforms that can be used in combination to verify system operation, as summarized in the table below.
| A2B Evaluation Board | Main/Subordinate | Power Supply |
I2S/TDM | PDM Mics |
| EVAL-AD2428WD1BZ | Main/Subordinate | Local | Yes | 3 |
| EVAL-AD2428WB1BZ | Subordinate | Bus | Yes | 2 |
| EVAL-AD2428WC1BZ | Subordinate | Bus | No | 4 |
| EVAL-AD2428WG1BZ | Subordinate | Local | Yes | 0 |
| ADZS-AD2428MINI | Main/Subordinate | Local/Bus | Yes | 0 |
Please contact your local ADI sales office or authorized ADI product distributor to receive additional product information and technical support.
EVAL-AD2428WD1BZ
A2B® Main or Local-Power Subordinate Node (I2S/TDM, 3 PDM Mics)
Features and Benefits
|
Please contact your local ADI sales office or authorized ADI product distributor to receive additional product information and technical support.
Product Detail
An Automotive Audio Bus (A2B®) system consists of a single main node and at least one subordinate node, where the transceiver at the host controller is the main node. The main transceiver generates clock, synchronization, and framing for all subordinate nodes and is programmable over a control bus (I2C) for configuration and readback. An extension of this control bus is embedded in the A2B data stream, which enables the host to directly access subordinate transceiver registers and any I2C-connected peripherals on subordinate nodes. Transceivers can connect directly to PDM microphones and to numerous peripherals via I2C and a multichannel I2S/TDM interface. Finally, the transceiver also supports an A2B bus powering feature, where the main node supplies voltage and current to the subordinate nodes over the same daisy-chained, twisted pair wire cable as used for the communication link, thus eliminating the need for a power supply on bus-powered subordinate nodes. Due to the numerous configurations that are possible for a given A2B system, there are several evaluation platforms that can be used in combination to verify system operation, as summarized in the table below.
| A2B Evaluation Board | Main/Subordinate | Power Supply |
I2S/TDM | PDM Mics |
| EVAL-AD2428WD1BZ | Main/Subordinate | Local | Yes | 3 |
| EVAL-AD2428WB1BZ | Subordinate | Bus | Yes | 2 |
| EVAL-AD2428WC1BZ | Subordinate | Bus | No | 4 |
| EVAL-AD2428WG1BZ | Subordinate | Local | Yes | 0 |
| ADZS-AD2428MINI | Main/Subordinate | Local/Bus | Yes | 0 |
Please contact your local ADI sales office or authorized ADI product distributor to receive additional product information and technical support.
Resources
EVAL-AD2428WB1BZ
Bus-Powered A2B® Subordinate Node (I2S/TDM, 2 PDM Mics)
Features and Benefits
- AD2428W Automotive Audio Bus A2B® Transceiver
- A2B subordinate operation
- Multichannel I2S/TDM interface
- Two PDM microphone inputs
- Powered over A2B bus
- ADAU1761 SigmaDSP® Stereo, Low Power, 96 kHz, 24-Bit Audio Codec with Integrated PLL
- Status and Interrupt LEDs
- Pushbutton Interrupt Generation
Please contact your local ADI sales office or authorized ADI product distributor to receive additional product information and technical support.
Product Detail
An Automotive Audio Bus (A2B®) system consists of a single main node and at least one subordinate node, where the transceiver at the host controller is the main node. The main transceiver generates clock, synchronization, and framing for all subordinate nodes and is programmable over a control bus (I2C) for configuration and readback. An extension of this control bus is embedded in the A2B data stream, which enables the host to directly access subordinate transceiver registers and any I2C-connected peripherals on subordinate nodes. Transceivers can connect directly to PDM microphones and to numerous peripherals via I2C and a multichannel I2S/TDM interface. Finally, the transceiver also supports an A2B bus powering feature, where the main node supplies voltage and current to the subordinate nodes over the same daisy-chained, twisted pair wire cable as used for the communication link, thus eliminating the need for a power supply on bus-powered subordinate nodes. Due to the numerous configurations that are possible for a given A2B system, there are several evaluation platforms that can be used in combination to verify system operation, as summarized in the table below.
| A2B Evaluation Board | Main/Subordinate | Power Supply |
I2S/TDM | PDM Mics |
| EVAL-AD2428WD1BZ | Main/Subordinate | Local | Yes | 3 |
| EVAL-AD2428WB1BZ | Subordinate | Bus | Yes | 2 |
| EVAL-AD2428WC1BZ | Subordinate | Bus | No | 4 |
| EVAL-AD2428WG1BZ | Subordinate | Local | Yes | 0 |
| ADZS-AD2428MINI | Main/Subordinate | Local/Bus | Yes | 0 |
Please contact your local ADI sales office or authorized ADI product distributor to receive additional product information and technical support.
ADZS-AUDIOA2BAMP
A2B® Class-D Amplifier Module
Features and Benefits
- Two SSM3582 high-efficiency Class-D amplifiers
- Inputs: 4 mono (or 2 stereo) channels, sourced by
- the SHARC® Audio Module (or another A2B source) connected via A2B
- a TDM I2S source connected to 12-pin header
- Outputs: 4 amplified speaker channels at 15W each or 2 "bridged" amplified channels at 50W each. Each SSM3582 can provide:
- 2× 14.67 W output at 12 V supply to 4 Ω loads at <1% THD + N, or
- 1× 49.69 W output at 16 V supply to 2 Ω loads at <1% THD + N
- Class-D amp bridged mode can be used to support 2.1 audio configurations
- Inputs: 4 mono (or 2 stereo) channels, sourced by
- AD2428W low-latency A2B audio bus transceiver
- Connects to SHARC Audio Module (or another A2B source) via twisted-wire-pair cable (included)
- Two pushbuttons routed to I/O pins (can be sensed by any system A2B node)
- Two GPIO pins routed to LEDs (can be driven by any system A2B node)
- Can be cascaded via A2B to provide 8 amplified output channels to support 7.1 and other speaker configurations
- Further expansion possible using additional modules connected via A2B or fins connected directly to the SHARC Audio Module expansion port
- Fully integrated A2B software and drivers in the SHARC Audio Module Bare Metal Audio Framework and the SigmaStudio® A2B Software package
Product Detail
The A2B Class-D Amplifier Module leverages ADI's low-latency A2B audio bus technology, featuring an AD2428W A2B transceiver (serving as an A2B subordinate) that accepts audio over the A2B bus from a connected A2B node in the system. The ADZS-AUDIOA2BAMP Module drives the received A2B data to a pair of high-efficiency, digital input, stereo SSM3582 class-D audio amplifiers. Audio is transmitted digitally to the amplifier, minimizing the possibility of signal corruption in digital environments. See the SSM3582 data sheet for more information.
As the A2B Class-D Amplifier Module is an A2B subordinate node, it must be incorporated into an A2B system with a main node, such as the SHARC® Audio Module or the A2B main evaluation board. Connect the A2B Class-D Amplifier Module to the system using the included A2B twisted-wire-pair cable.
Resources
ADZS-AD2428MINI
AD2428 MINI Break-Out Board (32-Pin & 100-Pin Connectors)
Features and Benefits
- AD2428W Automotive Audio Bus A2B® Transceiver
- Multichannel I2S/TDM interface
- Main or Subordinate Node (Local Power & Bus Power)
- 100 pin connector for interfacing with EV-SOMCRR-EZKIT
- “Break out board” for A2B
- 32 pin 0.1" header for customers to interface their own designs
- EEPROM
- LT8620 – 2A, Step-Down Switching Regulator
- Power, Status, GPIO, and Interrupt LEDs
Product Detail
ADZS-AD2428MINI is a low-cost, mini break-out board which can interface with EV-SOMCRR-EZKIT (via a 100-pin connector) or any custom board (via a 32 pin 0.1" header). It supports main and subordinate node capability as well as bus and local power configurations.
An Automotive Audio Bus (A2B®) system consists of a single main node and at least one subordinate node, where the transceiver at the host controller is the main node. The main transceiver generates clock, synchronization, and framing for all subordinate nodes and is programmable over a control bus (I2C) for configuration and readback. An extension of this control bus is embedded in the A2B data stream, which enables the host to directly access subordinate transceiver registers and any I2C-connected peripherals on subordinate nodes.
Transceivers can connect directly to PDM microphones and to numerous peripherals via I2C and a multichannel I2S/TDM interface. Finally, the transceiver also supports an A2B bus powering feature, where the main node supplies voltage and current to the subordinate nodes over the same daisy-chained, twisted pair wire cable as used for the communication link, thus eliminating the need for a power supply on bus-powered subordinate nodes. Due to the numerous configurations that are possible for a given A2B system, there are several evaluation platforms that can be used in combination to verify system operation, as summarized in the table below.
| A2B Evaluation Board | Main/Subordinate | Power Supply |
I2S/TDM | PDM Mics |
| EVAL-AD2428WD1BZ | Main/Subordinate | Local | Yes | 3 |
| EVAL-AD2428WB1BZ | Subordinate | Bus | Yes | 2 |
| EVAL-AD2428WC1BZ | Subordinate | Bus | No | 4 |
| EVAL-AD2428WG1BZ | Subordinate | Local | Yes | 0 |
| ADZS-AD2428MINI | Main/Subordinate | Local/Bus | Yes | 0 |
Please contact your local ADI sales office or authorized ADI product distributor to receive additional product information and technical support.
Resources
A2B Bus Analyzer
A2B Node Emulator and Bus Traffic Monitor
Features and Benefits
Key Product Features
- Node Emulator
- AD243x — Main/Sub node — Standard/High Power
- AD242x — Main/Sub node
- A2B Bus Traffic Monitor
- Simultaneous Monitor and Emulator operation
- Selectable audio interface
- Analog I/O
- Digital SPDIF I/O
- USB2.0 Audio Class
- Streaming from/to PC
- Intuitive Graphical User Interface
- Supported on Windows, Linux, MacOS
- Software Development Kit (SDK)
Key Benefits
- Powerful, multi-function HW
- Supports Rapid development
- HW locked license
- Software push notifications
- Seamless integration to SigmaStudio+
- Fully compatible with SigmaStudio
Contact your nearest Analog Devices sales office to complete the Non-Disclosure Agreement (NDA) required to receive additional product information. For technical support, send email to a2b.analyzer.support@analog.com. Additional support is available from your Analog Devices local sales.
Product Detail
ADI A2B Bus Analyzer is a robust development tool supporting the design and debug of AD242x/3x based A2B networks. It can be configured to act as active bus emulation tool and/or as a passive bus monitor.
The tool consists of the following main components:
- Hardware unit
- A2B Main/Sub node emulation
- Passive bus traffic monitor
- Variety of audio input/output interfaces
- High speed USB Interface for audio and control communication
- GUI application
- Intuitive GUI for device configuration and control
- Capture/playback of Real-time audio streams and bus traffic on PC
- Inject test tones/streams from PC on to the bus for debug
- A2B Network/node management and diagnostics
- Audio streaming over USB using ASIO/ALSA/CoreAudio
- Support for Windows, Linux, MacOS
- SDK
- Software Development Kit (SDK) to create custom applications
The tool can be used in the following scenarios:
- Engineering – Design & Development
- Test & Validation
- Pre-production Testing
- CE/FCC certification process is underway
Resources
