Data Sheet

VISIT ANALOG.COM
AD242x
(
W
)
Enhanced Automotive Audio Bus Transceivers
VREG1
I
2
C
PLL
DTX0/DTX3
DTX0/DTX5
IRQ/IO0
D
RX1/DRX6
DTX1/DTX4
SDA
SCL
ADR1/IO1
IOVDD
BCM
AP
ACM
BN
DVDD
BTRXVDD
PLLVDD
VSS ATRXVDDSYNCBCLK
SWP
VINVOUT1
ADR2/IO2
VREG2
VOUT2
VSSN
AN
BP
S
ENSE
PDMCLK/IO7
A
2
B
TRx A
(Toward
Master)
A
2
B
TRx B
(Toward
Last Slave)
Diagnostics
I
2
S/TDM/
PDM
ACTIVE SUB
WOOFER
REMOTE
TUNER
MODULE
AUDIO
AMP
HEAD
UNIT
eCALL
BOX
Overview
Automotive Audio Bus
®
technology provides a
multichannel, I²S/TDM link over distances of up
to 15 meters between nodes. It embeds bidirec-
tional synchronous data, clock, control data, and
power 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 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. It generates clock,
synchronization, and framing for all slave nodes.
The master A²B transceiver is programmable over
a control bus
(
I²C
)
for configuration and readback.
An extension of this control bus is embedded in the
A²B data stream, allowing direct access of registers
and status information on slave transceivers, as
well as I²C-to-I²C communication over distance.
Target Applications Include
►
Audio ECU communication links
►
Active noise cancellation
(
ANC
)
►
Road noise cancellation
(
RNC
)
►
Microphone arrays for hands-free, in-car
communications and eCall systems
Simple and Cost-Eective
Architecture for Emerging
Applications
►
Digital audio; single, low cost, unshielded
twisted pair
(
UTP
)
wire transports audio,
control, clock, and power
Downloaded from Arrow.com.