MAX3747A_12 Datasheet, PDF (1/11 Pages) Maxim Integrated Products – 155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers

EVALUATION KIT AVAILABLE
MAX3747A/MAX3747B
155Mbps to 3.2Gbps, Low-Power SFP
Limiting Amplifiers
General Description
The MAX3747A/MAX3747B multirate limiting amplifiers
function as data quantizers for OC-3 through OC-48 syn-
chronous optical network (SONET), Fibre-Channel, and
Gigabit Ethernet optical receivers. They are pin-for-pin
compatible with the SY88993V from Micrel
Semiconductor, Inc. The amplifiers accept a wide range
of input voltages and provide constant-level, current-
mode logic (CML) output voltages with controlled edge
speeds. The MAX3747A/MAX3747B output voltages are
800mV_P-P. The MAX3747B has enhanced LOS operation
under overload conditions.
The MAX3747A/MAX3747B limiting amplifiers feature a
programmable loss-of-signal detect (LOS) and an
optional disable function (DISABLE) that can be com-
bined to implement squelch.
The MAX3747A/MAX3747B are available in a 3mm, 10-
pin µMAX® package ideal for small form-
factor receivers.
Applications
Gigabit Ethernet SFP/SFF Optical Transceiver Modules
1G/2G Fibre-Channel SFP/SFF Optical Transceiver
Modules
Multirate OC-3 to OC-48 FEC SFP/SFF Optical
Transceiver Modules
10G LX4 Transceiver Modules
Features
o Pin Compatible with Micrel SY88993V
o 155Mbps to 3.2Gbps Operation
o > 57dB of Gain
o < 10^-12 BER with 2mV_P-P Input Amplitude
o 18mA Supply Current
o Chatter-Free LOS with Programmable Threshold
o Output DISABLE Function
o PECL-Compatible Inputs
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX3747AEUB+
-40°C to +85°C 10 µMAX
MAX3747BEUB+
-40°C to +85°C 10 µMAX
+Denotes a lead(Pb)-free/RoHS-compliant package.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configuration appears at end of data sheet.
Typical Application Circuit
3-INPUT
DIAGNOSTIC
MONITOR
DS1859
VCC
MAX4004
MAX3745
5-PIN TO-HEADER
SFP OPTICAL RECEIVER
SUPPLY FILTER
0.1µF
0.1µF
VCC
MAX3747A
MAX3747B
IN+
IN-
0.1µF
OUT+
0.1µF
OUT-
50Ω 50Ω
VREF TH
GND LOS DISABLE
RTH1
0.1µF
RTH2
0.1µF
HOST BOARD
HOST FILTER
VCC_RX
50Ω
SERDES
50Ω
4.7kΩ TO 10kΩ
VCC_HOST
LOS
VCC ^{RTH1 + RTH2 ≥ 5kΩ}
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-0281; Rev 2; 8/12