SI5040-D-GM Silicon Laboratories Inc, SI5040-D-GM Datasheet - Page 18

• Manufacturer Part Number: SI5040-D-GM
• Description: IC TXRX XFP 10GBPS 32LGA
• Manufacturer: Silicon Laboratories Inc

Specifications of SI5040-D-GM

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Si5040
4. Functional Description
The
bidirectional signal conditioner for use in XFP modules
as defined by the XFP multi-source agreement. The
Si5040 includes independent clock and data recovery
units (CDRs) and frequency-agile, jitter-attenuating
clock multiplier units (CMUs) in both receive and
transmit directions. The receive path includes a limiting
amplifier and a programmable equalizer for direct
connection to an optical receiver trans-impedance
amplifier. The transmit path includes an equalizer for
direct connection to the XFI channel.
The device provides data-agnostic operation over a
continuous range of data rates from 9.95 to 11.35 Gbps.
Typical data rates and associated applications include
the following:






Serial control and status monitoring is supported with
either an SPI-like or I
18
9.95 Gbps: SONET OC-192, SDH STM-64, 10 Gbps
Ethernet WAN PHY
10.31 Gbps: 10 Gbps Ethernet LAN PHY
10.52 Gbps: 10 Gbps FibreChannel (10 GFC)
10.70 Gbps: OTN OTU-2 (G.709)
11.09 Gbps: 10 Gbps Ethernet LAN PHY with
255/237 FEC coding
11.32 Gbps: 10 Gbps FibreChannel with 255/237
FEC coding
Si5040
XFP
2
C serial interface.
transceiver
is
a
single-chip,
Rev. 0.86
5. Receiver
The
equalizer, a high-sensitivity limiting amplifier, clock and
data recovery unit (CDR), and a FIFO/retimer function.
5.1. Receive Equalizer
The Rx equalizer is a programmable equalizer designed
to
attenuating the low-frequency components. Figure 9
illustrates a typical frequency response of the Rx
equalizer when its capacitor setting (or high-frequency
boost, RxEqHFBoost at Register 85, Bit [7:5]) is set to
the maximum value and its resistor setting (or low-
frequency gain/attenuation, RxEqGain at Register 84,
Bit [7:5]) is changed to achieve different low-frequency
attenuations.
To optimize the equalizer settings for a given
application, the following procedure is recommended:


Note that setting RxEqGain to 0 dB bypasses the
equalizer.
-10.00
-11.00
-12.00
-13.00
-14.00
-15.00
-16.00
-17.00
-18.00
-19.00
-20.00
-21.00
-22.00
-23.00
-24.00
-25.00
-1.00
-2.00
-3.00
-4.00
-5.00
-6.00
-7.00
-8.00
-9.00
2.00
1.00
0.00
1.00E+06
Set RxEqHFBoost at Register 85, Bit [7:5] to 7
(Default = 4), and adjust RxEqGain at Register 84,
Bit [7:5] (Default = 5), to achieve the best
performance.
Further adjust RxEqHFBoost to increase the
performance further.
boost
Si5040
Figure 9. Typical Rx Equalizer
the
1.00E+07
Frequency Response
receiver
high-frequency
1.00E+08
Frequency (Hz)
includes
1.00E+09
components
a
programmable
1.00E+10
while
1.00E+11