参数资料
型号: ADN4693EBRZ-RL7
厂商: Analog Devices Inc
文件页数: 7/20页
文件大小: 0K
描述: IC TXRX MLVDS 200MBPS 14SOIC
标准包装: 1,000
系列: *
Data Sheet
ADN4691E/ADN4693E/ADN4696E/ADN4697E
Rev. A | Page 15 of 20
GLITCH-FREE POWER-UP/POWER-DOWN
To minimize disruption to the bus when adding nodes, the
M-LVDS outputs of the device are kept glitch-free when the
device is powering up or down. This feature allows insertion of
devices onto a live M-LVDS bus because the bus outputs are not
switched on before the device is fully powered. In addition, all
outputs are placed in a high impedance state when the device is
powered off.
FAULT CONDITIONS
short-circuit current protection that protects the part under
fault conditions in the case of short circuits on the bus. This
protection limits the current in a fault condition to 24 mA at
the transmitter outputs for short-circuit faults between 1 V
and +3.4 V. Any network fault must be cleared to avoid data
transmission errors and to ensure reliable operation of the data
network and any devices that are connected to the network.
RECEIVER INPUT THRESHOLDS/FAIL-SAFE
Two receiver types are available, both of which incorporate
protection against short circuits.
The Type 1 receivers of the ADN4691E/ADN4693E incorporate
25 mV of hysteresis. This ensures that slow-changing signals or
a loss of input does not result in oscillation of the receiver output.
Type 1 receiver thresholds are ±50 mV; therefore, the state of the
receiver output is indeterminate if the differential between A and
B is about 0 V. This state occurs if the bus is idle (approximately 0 V
on both A and B), with no drivers enabled on the attached nodes.
Type 2 receivers (ADN4696E/ADN4697E) have an open circuit
and bus-idle fail-safe. The input threshold is offset by 100 mV so
that a logic low is present on the receiver output when the bus is
idle or when the receiver inputs are open.
The different receiver thresholds for the two receiver types are
illustrated in Figure 36. See Table 12 and Table 13 for receiver
output states under various conditions.
TYPE 1 RECEIVER
OUTPUT
LOGIC 1
LOGIC 0
D
IFF
E
R
E
N
TI
A
L
I
N
PU
T
VO
LT
A
GE
(
V
IA
V
IB
)[V
]
0.25
0.15
0.05
–0.05
–0.15
0
TYPE 2 RECEIVER
OUTPUT
LOGIC 1
LOGIC 0
UNDEFINED
10
355
-0
36
UNDEFINED
Figure 36. Input Threshold Voltages
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