Rainbow-electronics MAX3983 Manual de usuario Pagina 10

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MAX3983
Quad Copper-Cable Signal Conditioner
10 ______________________________________________________________________________________
Pin Description (continued)
PIN NAME FUNCTION
55, 58, 61,
64
RX_OUT4+ to
RX_OUT1+
PC Board Transmitter Positive Data Outputs, CML. These outputs are terminated with 50 to V
CC
4.
56, 59, 62,
65
RX_OUT4- to
RX_OUT1-
PC Board Transmitter Negative Data Outputs, CML. These outputs are terminated with 50 to V
CC
4.
67 RX_PE
PC Board Transmitter Preemphasis Control Input, LVTTL with 40k Internal Pullup. Set high or open
to assert this bit.
68 LOOPBACK
Loopback Enable Input, LVTTL with 40k Internal Pullup. Set low for normal operation. Set high or
open for internal connection of TX_IN to RX_OUT. TX_OUT continues to transmit when loopback is
enabled.
EP Exposed Pad
Exposed Pad. Signal and supply ground. For optimal high-frequency performance and thermal
conductivity, this pad must be soldered to the circuit board ground.
TX_OUT[1:4]+
TX_OUT[1:4]-
GND
2
RX_IN[1:4]-
RX_IN[1:4]+
1
0
POR
POWER
MANAGEMENT
LVTTL
LVTTL
SIGNAL
DETECT
LVTTL
CML
PRE-
EMPHASIS
CML
FIXED
EQUALIZER
CML
CML
FIXED
EQUALIZER
PRE-
EMPHASIS
TX_IN[1:4]-
TX_IN[1:4]+
TX_ENABLE
LOOPBACK
TX_PE[0:1]
RX_OUT[1:4]-
RX_OUT[1:4]+
RX_ENABLE
RX_SD[1:4]
RX_PE
40k
40k
40k
TX_SD[1:4]
SIGNAL
DETECT
LIMITER
LIMITER
V
CC
1
V
CC
1
V
CC
3
V
CC
1
V
CC
2
V
CC
2
V
CC
4
LVTTL
LVTTL
40k
40k
V
CC
3
V
CC
3
V
CC
4
V
CC
4
V
CC
4
V
CC
3
V
CC
4
V
CC
4
V
CC
2
V
CC
2V
CC
1
V
CC
3
MAX3983
Figure 3. Functional Diagram
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