ADN4691E/ADN4693E/ADN4696E/ADN4697E Data Sheet
Rev. B | Page 16 of 20
APPLICATIONS INFORMATION
M-LVDS extends the low power, high speed, differential signaling
of low voltage differential signaling (LVDS) to multipoint systems
where multiple nodes are connected over short distances in a
bus topology network.
With M-LVDS, a transmitting node drives a differential signal
across a transmission medium such as a twisted pair cable. The
transmitted differential signal allows other receiving nodes that
are connected along the bus to detect a differential voltage that
can then be converted back into a single-ended logic signal by
the receiver.
The communication line is typically terminated at both ends
by resistors (R
T
), the value of which is chosen to match the
characteristic impedance of the medium (typically 100 Ω).
For half-duplex multipoint applications such as the one shown
in Figure 37, only one driver can be enabled at any time. Full-
duplex nodes allow a master-slave topology as shown in Figure 38.
In this configuration, a master node can concurrently send and
receive data to/from slave nodes. At any time, only one slave
node can have a driver enabled to concurrently transmit data
back to the master node.
RO
NOTES
1. MAXIMUM NUMBER OF NODES: 32.
2. R
T
IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE USED.
RE
A B
R
D
R
T
R
T
ADN4696E
DE DI
RO RE
A B
ADN4696E
DE DI
RO RE
A B
ADN4696E
DE DI
RO RE
A B
ADN4696E
DE DI
10355-037
R
D
R
D
R
D
R
D
R
D
R
D
R
D
Figure 37. ADN4696E Typical Half-Duplex M-LVDS Network (Type 2 Receivers with Threshold Offset for Bus-Idle Fail-Safe)
RO
NOTES
1. MAXIMUM NUMBER OF NODES: 32.
2. R
T
IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE USED.
RE
A B Z Y
MASTER SLAVE SLAVE SLAVE
R
T
R
T
ADN4697E
DE DI RO RE DE DI RO RE DE DI
A B Z Y
ADN4697E
A B Z Y
ADN4697E
A B Z Y
ADN4697E
R
T
R
T
RO RE DE DI
10355-038
R
D
R
D
R
D
R
D
Figure 38. ADN4697E Typical Full-Duplex M-LVDS Master-Slave Network (Type 2 Receivers with Threshold Offset for Bus-Idle Fail-Safe)
