New Content (5)
Overview
Features and Benefits
- Line topology
- Single master, multiple slaves
- 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
- Clock synchronous, phase aligned in all nodes
- Low latency slave to slave communication
- Control and status information I2C to I2C
- GPIO over distance
- Synchronous data
- Bus power or local power slave nodes
- Configurable with SigmaStudio® graphical software tool
- Configurable as A2B bus master (supporting up to 10 slaves) or slave
- 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
- Supports 4 high dynamic range microphone inputs
- Programmable sampling rate
- Performs 24-bit PCM demodulation
- Support for receiving I2S data on nodes with up to 4 PDM microphones
- Unique ID register for each transceiver
- Support for crossover or straight-through cabling
- Programmable settings to optimize EMC performance
Product Details
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 modulated (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 channel content.
A2B is a single-master, multiple-slave system where the transceiver at the host controller is the master. The master transceiver generates clock, synchronization, and framing for all slave nodes and is programmable over a control bus (I2C) for configuration and read back. An extension of this control bus is embedded in the A2B data stream, which enables direct access to registers and status information on slave transceivers, as well as providing 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 PDM interface for direct connection of up to four PDM digital microphones.
Finally, the transceiver also supports an A2B bus powering feature, where the master node supplies voltage and current to the slave 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 slave nodes.
| Feature | AD2420(W) | AD2426(W) | AD2427(W) | AD2428(W) | AD2429(W) |
| Master/Slave Capability | Slave | Slave | Slave | Both | Master |
| 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 mics | 4 mics | 4 mics | 4 mics | 4 mics |
| # of Slaves Supported | N/A | N/A | N/A | Up to 10 | Up to 2 |
| Max node to node cable length | 5 m | 15 m | 15 m | 15 m | 5 m |
Product Categories
Markets & Technology
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Part#
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Vsupply (min)
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Vsupply (max)
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US Price 1000-4999
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Status
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Product Description
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Number of Nodes
|
Master/ Slave
|
Iout Isolated Supply (max
|
Interface Protocol
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ESD Protection
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Data Rate (max)
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# of Channels
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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3.7V
|
9V
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$1.85
|
Pre-Release
|
A2B last-in-line slave 2xPDM XCVR
|
3
|
Slave
|
100mA
|
A2B, I2C, PDM
|
2.5kV
|
50Mbps
|
32
|
|
|
3.7V
|
9V
|
$2.97
|
Pre-Release
|
A2B mid-line slave 4xPDM XCVR
|
11
|
Slave
|
300mA
|
A2B, I2C, PDM
|
2.5kV
|
50Mbps
|
32
|
|
|
3.7V
|
9V
|
$2.72
|
Pre-Release
|
A2B last-in-line slave 4xPDM XCVR
|
11
|
Slave
|
-
|
A2B, I2C, PDM
|
2.5kV
|
50Mbps
|
32
|
|
|
3.7V
|
9V
|
$2.88
|
Pre-Release
|
A2B master 4xPDM XCVR w I2S/TDM
|
3
|
Master
|
100mA
|
A2B, I2C, I2S, PDM
|
2.5kV
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50Mbps
|
32
|
Product Lifecycle
Pre-Release
This product is new and engineering validation may still be underway. Quantities may be limited and design specifications may change while we ready the product for release to production.
Evaluation Kits (5)
Documentation
User Guides (6)
Product Highlight (1)
Software & Systems Requirements
Software Development Tools
A2B® Software
SigmaStudio®
Reference Materials
3rd-Generation A2B® Transceivers Offer Enhanced Configurability
Design Resources
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.
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Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
