Rainbow-electronics MAX3983 Manual do Utilizador descarregar pdf (Página 10)

MAX3983

Quad Copper-Cable Signal Conditioner

10 ______________________________________________________________________________________

Pin Description (continued)

PIN NAME FUNCTION

55, 58, 61,

RX_OUT4+ to

RX_OUT1+

PC Board Transmitter Positive Data Outputs, CML. These outputs are terminated with 50Ω to V

56, 59, 62,

RX_OUT4- to

RX_OUT1-

PC Board Transmitter Negative Data Outputs, CML. These outputs are terminated with 50Ω to V

67 RX_PE

PC Board Transmitter Preemphasis Control Input, LVTTL with 40kΩ Internal Pullup. Set high or open

to assert this bit.

68 LOOPBACK

Loopback Enable Input, LVTTL with 40kΩ 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

RX_IN[1:4]-

RX_IN[1:4]+

POR

POWER

MANAGEMENT

LVTTL

SIGNAL

DETECT

LVTTL

CML

PRE-

EMPHASIS

CML

FIXED

EQUALIZER

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

40kΩ

TX_SD[1:4]

SIGNAL

DETECT

LIMITER

LVTTL

40kΩ

MAX3983

Figure 3. Functional Diagram

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16

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