MAX3748_11 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Compact 155Mbps to 4.25Gbps Limiting Amplifier 86ps Rise and Fall Time

19-2717; Rev 6; 6/11
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Compact 155Mbps to 4.25Gbps
Limiting Amplifier
General Description
The MAX3748 multirate limiting amplifier functions as a
data quantizer for SONET, Fibre Channel, and Gigabit
Ethernet optical receivers. The amplifier accepts a wide
range of input voltages and provides constant-level
current-mode logic (CML) output voltages with con-
trolled edge speeds.
A received-signal-strength indicator (RSSI) is available
when the MAX3748 is combined with the MAX3744 SFP
transimpedance amplifier (TIA). A receiver consisting of
the MAX3744 and the MAX3748 can provide up to
19dB RSSI dynamic range. Additional features include
a programmable loss-of-signal (LOS) detect, an option-
al disable function (DISABLE), and an output signal
polarity reversal (OUTPOL). Output disable can be
used to implement squelch.
The combination of the MAX3748 and the MAX3744
allows for the implementation of all the small-form-factor
SFF-8472 digital diagnostic specifications using a stan-
dard 4-pin TO-46 header. The MAX3748 is packaged in
a 3mm x 3mm, 16-pin thin QFN package with an
exposed pad.
Applications
Gigabit Ethernet SFF/SFP Transceiver Modules
Fibre Channel SFF/SFP Transceiver Modules
Multirate OC-3 to OC-48-FEC SFF/SFP
Transceiver Modules
Features
♦ SFP Reference Design Available
♦ 16-Pin TQFN Package with 3mm x 3mm Footprint
♦ Single 3.3V Supply Voltage
♦ 86ps Rise and Fall Time
♦ Loss of Signal with Programmable Threshold
♦ RSSI Interface (with MAX3744 TIA)
♦ Output Disable
♦ Polarity Select
♦ 8.7ps_P-P Deterministic Jitter (4.25Gbps)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX3748HETE#G16* -40°C to +85°C 16 TQFN-EP**
MAX3748ETE
-40°C to +85°C 16 TQFN-EP**
H = hybrid lead-free package. *See Detailed Description for
more information. The MAX3748H is the MAX3748 in a hybrid
lead-free package.
#Denotes a RoHS-compliant device that may include lead that
is exempt under the RoHS requirements.
**EP = Exposed pad.
Functional Diagram and Pin Configuration appear at end of
data sheet.
Typical Operating Circuits
SFP OPTICAL RECEIVER
HOST BOARD
4-PIN TO HEADER
MAX3744 TIA
OUTPOL
IN+
IN-
0.1μF
SUPPLY FILTER
V_CC
CAZ1 CAZ2
0.1μF
OUT+
0.1μF
OUT-
HOST FILTER
V_CC_RX
50Ω
SERDES
50Ω
DS1858
3-INPUT DIAGNOSTIC
MONITOR
R1
3kΩ
MAX3748
RSSI TH
GND
R_TH
C1
0.1μF
DISABLE LOS
4.7kΩ TO 10kΩ
V_CC_HOST
LOS
Typical Operating Circuits continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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