19-3297; Rev 1; 10/07
155Mbps to 3.2Gbps, Low-Power SFP
Limiting Amplifiers
/MAX347B
General Description
Features
The MAX3747/MAX3747A/MAX3747B multirate limiting
amplifiers function as data quantizers for OC-3 through
OC-48 synchronous 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.
♦ Pin Compatible with Micrel SY88993V
♦ 155Mbps to 3.2Gbps Operation
♦ > 57dB of Gain
-
12
♦ < 10
BER with 2mV
Input Amplitude
P-P
♦ 18mA Supply Current
♦ Chatter-Free LOS with Programmable Threshold
♦ Output DISABLE Function
The MAX3747 output voltage level is 500mV
and the
P-P
MAX3747A/MAX3747B output voltages are 800mV
.
P-P
The MAX3747B has enhanced LOS operation under over-
load conditions.
♦ PECL-Compatible Inputs
The MAX3747/MAX3747A/MAX3747B limiting amplifiers
feature a programmable loss-of-signal detect (LOS)
and an optional disable function (DISABLE) that can be
combined to implement squelch.
Ordering Information
PIN-
PACKAGE
PKG
CODE
PART
TEMP RANGE
The MAX3747/MAX3747A/MAX3747B are available in a
3mm, 10-pin µMAX® package ideal for small form-
factor receivers.
MAX3747EUB
MAX3747AEUB
MAX3747BEUB
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
10 µMAX
10 µMAX
10 µMAX
U10C-4
U10C-4
U10C-4
Applications
Gigabit Ethernet SFP/SFF Optical Transceiver Modules
1G/2G Fibre-Channel SFP/SFF Optical Transceiver
Modules
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Multirate OC-3 to OC-48 FEC SFP/SFF Optical
Transceiver Modules
Pin Configuration appears at end of data sheet.
10G LX4 Transceiver Modules
Typical Application Circuit
SFP OPTICAL RECEIVER
HOST BOARD
3-INPUT
DIAGNOSTIC
MONITOR
SUPPLY FILTER
HOST FILTER
RX
V
CC
V
CC_
DS1859
MAX4004
V
CC
MAX3747
MAX3747A
MAX3747B
0.1μF
0.1μF
0.1μF
0.1μF
IN+
IN-
OUT+
OUT-
50Ω
SERDES
MAX3745
50Ω
5-PIN TO-HEADER
V
TH
GND LOS DISABLE
REF
50Ω
50Ω
4.7kΩ TO 10kΩ
V HOST
CC_
LOS
R
R
TH1
0.1μF
0.1μF
TH2
R
TH1
+ R ≥ 5kΩ
TH2
V
CC
________________________________________________________________ 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.