MAX3805ETE Maxim Integrated, MAX3805ETE Datasheet - Page 6

• Manufacturer Part Number: MAX3805ETE
• Description: Specialty Function Logic 10.7Gbps Settable Receive EQ
• Manufacturer: Maxim Integrated
• Series: MAX3805r

Specifications of MAX3805ETE

• Operating Temperature Range: + 85 C

The low-noise input stage of the MAX3805 includes two
amplifiers, one with flat frequency response and the
other with a highpass frequency response compensat-
ing for the loss characteristic of 6-mil FR-4 PC board
transmission line. A current-steering network, imple-
mented with a pair of variable attenuators feeding into a
common summing node, provides the means to contin-
uously vary the amount of equalization. The amount of
equalization is controlled by feedback from two power-
detector blocks that set the variable attenuators to
match the loss of a particular transmission path.
The MAX3805 adapts the equalizer to a specific path
loss by sampling the output of the summing node with a
pair of frequency-dependent power detectors. The first
power detector has a lowpass bandwidth of 500MHz; the
second power detector has full bandwidth.
NRZ PRBS data has a sin
When this data is passed through a lossy FR-4 path,
high-frequency components are attenuated, while low-
10.7Gbps Adaptive Receive Equalizer
6
_______________________________________________________________________________________
SDI+
SDI-
Dual Power-Detector Feedback Loop
CML IN
MAX3805
V
Input Stage with Equalization
CC1
2
(f)/f
BOOST
FLAT
AMP
AMP
2
spectral characteristic.
ATTENUATOR
ATTENUATOR
VARIABLE
VARIABLE
FILTER
LOOP
∑
Figure 1. CML Output Structure
LFPD
V
CC
HFPD
50Ω
V
CC2
LIMITING
AMP
50Ω
DETECT
SIGNAL
Functional Diagram
SD
CML OUT
V
CC2
V
CC
STRUCTURES
OUT+
OUT-
SDO+
SDO-
EN
ESD