19-0406; Rev 2; 2/08
1Gbps to 12.5Gbps
Passive Equalizer for Backplanes and Cables
MAX387
General Description
Features
The MAX3787 is a 1Gbps to 12.5Gbps equalization
network that compensates for transmission medium loss-
es encountered with FR4 and cables. The equalization
network is composed entirely of passive components
and functions equally well for 8b/10b or scrambled sig-
nals. It is packaged in a small 1.5mm x 1.5mm chip-
scale package (UCSP™) that can be placed anywhere
along the transmission medium to increase jitter margin
for high-speed interconnects. Roughly the size of two
0603 components, the MAX3787 easily provides place-
ment and routing flexibility.
♦ No Power Supply Required
♦ Small 1.5mm x 1.5mm Chip-Scale Package
♦ Passive Equalization Reduces ISI
♦ Operates from 1Gbps to 12.5Gbps
♦ Extends Board Link
♦ Extends Cable Link
♦ Coding Independent, 8b/10b or Scrambled
Ordering Information
At 8.5Gbps, the MAX3787 compensates for spans up to
18in of FR4 and 7m of cable. At 12.5Gbps, the MAX3787
compensates for spans up to 12in of FR4 and 3m of
cable. Input and output impedance is 100Ω differential.
The MAX3787 requires no power and operates over a
-40°C to +125°C temperature range.
PIN-
PKG
PART
TEMP RANGE
PACKAGE CODE
MAX3787ABL
-40°C to +125°C 4 UCSP
-40°C to +125°C 4 WLP
B9-7
MAX3787AWL+
W91B1+3
+Denotes a lead-free package.
Applications
Pin Configuration
Backplane Interconnect Compensation
Cable Interconnect Compensation
Chip-to-Chip Link Extensions
TOP VIEW
1
2
3
A
B
C
OUT+
Ethernet and Fibre-Channel Serial Modules
Chassis Life Extension
IN+
MAX3787
IN-
OUT-
UCSP is a trademark of Maxim Integrated Products, Inc.
UCSP/WLP
Typical Application Circuits
SWITCH CARD
LINE CARD
ALL PASSIVE BACKPLANE INTERCONNECT
100Ω FR4
IN+
IN-
OUT+
OUT-
(100Ω)
Tx
Rx (100Ω)
MAX3787
100Ω FR4
OUT+
OUT-
IN+
IN-
(100Ω)
Tx
(100Ω)
Rx
MAX3787
Typical Application Circuits continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.