XRT91L34 datasheet(9/38 Pages) EXAR

9 / 38 page

XRT91L34

REV. 1.0.1

QUAD CHANNEL MULTIRATE STS-12/3/1 AND STM-4/1/0 SONET/SDH CDR

RECEIVER SECTION

NAME

LEVEL

TYPE

DESCRIPTION

RXDI0P

RXDI0N

RXDI1P

RXDI1N

RXDI2P

RXDI2N

RXDI3P

RXDI3N

LVDS,

Diff LVPECL

Receive Serial Data Input

The differential receive serial data stream of 622.08 Mbps

STS-12/STM-1 or 155.52 Mbps STS-3/STM-1 or 51.84 Mbps

STS-1/STM-0 is applied to these differential input pins. These

pins accept LVDS or Differential LVPECL input standard.

These pins are internally biased to 1.2V via 15k

Ω resistance

and are equipped with a 100

Ω line-to-line internal termination.

RXDO0P

RXDO0N

RXDO1P

RXDO1N

RXDO2P

RXDO2N

RXDO3P

RXDO3N

LVDS,

Diff LVPECL

Recovered Serial Data Output

622.08 Mbps STS-12/STM-4 / 155.52 Mbps STS-3/STM-1 /

51.84 Mbps STS-1/STM-0 differential recovered serial data out-

put that is updated simultaneously on the falling edge of the

corresponding channel RXCLKO output. User selectable LVDS

standard or Differential LVPECL standard output based on

OUTCFG pin state.

RXCLKO0P

RXCLKO0N

RXCLKO1P

RXCLKO1N

RXCLKO2P

RXCLKO2N

RXCLKO3P

RXCLKO3N

LVDS,

Diff LVPECL

Recovered Clock Output

(622.08 MHz/ 155.52 MHz/ 51.84 MHz)

622.08 MHz STS-12/STM-4 / 155.52 MHz STS-3/STM-1 /

51.84 MHz STS-1/STM-0 differential clock output for the corre-

sponding recovered data output RXDO[0:3]P/N. The recovered

serial data output port will be updated on the falling edge of

this clock. User selectable LVDS standard or Differential

LVPECL standard output based on OUTCFG pin state.

LOL0

LOL1

LOL2

LOL3

LVCMOS

CDR LOL Detect Output

This pin is used to monitor the lock condition of the PLL in the

clock and data recovery unit of each channel.

"Low" = CDR Locked

"High" = CDR Out of Lock

CAP0P

CAP0N

Analog

109

108

CDR Non-polarized External Loop Filter Capacitors

Mode of Operation:

1. STS12/STM4: CAP[0:3]P/N = 0.47

µF ± 10% tolerance

2. STS3/STM1: CAP[0:3]P/N = 0.47

µF ± 10% tolerance

3. STS1/STM0: CAP[0:3]P/N = 1.0

µF ± 10% tolerance

Use type X7R or X5R for improved stability over temperature.

(Isolate from noise and place close to pin)

CAP1P

CAP1N

Analog

103

102

CAP2P

CAP2N

Analog

CAP3P

CAP3N

Analog

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