ADN4690E(RevA) Просмотр технического описания (PDF) - Analog Devices

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ADN4690E
(Rev.:RevA)

3.3 V, 100 Mbps, Half- and Full-Duplex, High Speed M-LVDS Transceivers

Analog Devices 

ADN4690E/ADN4692E/ADN4694E/ADN4695E

Data Sheet

APPLICATIONS INFORMATION

M-LVDS extends the low power, high speed, differential signal-

ing of LVDS (low voltage differential signaling) 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.

RT

The communication line is typically terminated at both ends

by resistors (RT), 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 36, only one driver can be enabled at any time. Full-

duplex nodes allow a master slave topology, as shown in Figure 37.

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 its driver enabled to concurrently transmit data

back to the master node.

RT

AB

ADN4694E

AB

ADN4694E

AB

ADN4694E

AB

ADN4694E

RO RE DE DI

RO RE DE DI

RO RE DE DI

RO RE DE DI

NOTES

1. MAXIMUM NUMBER OF NODES: 32.

2. RT IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE USED.

Figure 36. ADN4694E Typical Half-Duplex M-LVDS Network (Type 2 Receivers with Threshold Offset for Bus-Idle Fail-Safe)

RT

RT

RT

RT

A B Z Y MASTER

ADN4695E

R

D

ABZ Y

SLAVE

ADN4695E

R

D

ABZ Y

SLAVE

ADN4695E

R

D

ABZ Y

SLAVE

ADN4695E

R

D

RO RE DE DI

RO RE DE DI

RO RE DE DI

RO RE DE DI

NOTES

1. MAXIMUM NUMBER OF NODES: 32.

2. RT IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE USED.

Figure 37. ADN4695E Typical Full-Duplex M-LVDS Master-Slave Network (Type 2 Receivers with Threshold Offset for Bus-Idle Fail-Safe)

Rev. A | Page 16 of 20

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