Rainbow Electronics MAX3746 - Manual

General Description
The MAX3746 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 selectable-level,
current-mode logic (CML) output voltages with con-
trolled edge speeds. A received-signal-strength indica-
tor (RSSI) is available when the MAX3746 is
DC-coupled to the MAX3744/MAX3724 SFP transim-
pedance amplifier (TIA). A receiver consisting of the
MAX3744/MAX3724 and the MAX3746 can provide up
to 19dB RSSI dynamic range. Additional features
include a programmable loss-of-signal (LOS) detect, an
optional disable function (DISABLE), and an
output-signal polarity reversal (OUTPOL). Output dis-
able can be used to implement squelch.
The combination of the MAX3746 and the MAX3744/
MAX3724 allows for the implementation of all the small-
form-factor SFF-8472 digital diagnostic specifications
using a standard 4-pin TO-46 header.
The MAX3746 is pin-for-pin compatible with the
MAX3748A limiting amplifier and consumes 30% less
power. The MAX3746 is packaged in a 3mm x 3mm,
16-pin QFN package.
Applications
Gigabit Ethernet SFF/SFP Transceiver Modules
Fibre-Channel SFF/SFP Transceiver Modules
Multirate OC-12 to OC48-FEC SFF/SFP
Transceiver Modules
Features
♦ SFP Reference Design Available
♦ Low 115mW Power Consumption
♦ 16-Pin QFN Package with 3mm x 3mm Footprint
♦ 70ps Rise and Fall Time
♦ Loss-of-Signal with Programmable Threshold
♦ RSSI Interface (with MAX3744/MAX3724 TIA)
♦ Output Disable
♦ Polarity Select
♦ 8.4ps
P-P
Deterministic Jitter (3.2Gbps)
♦ Improved EMI Performance
♦ Selectable CML Output levels
♦ Pin Compatible with MAX3748A
MAX3746
Low-Power, 622Mbps to 3.2Gbps
Limiting Amplifier
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3386; Rev 0; 8/04
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE PIN-PACKAGE PKG CODE
MAX3746ETE -40°C to +85°C 16 QFN T1633F-3
Typical Operating Circuits continued at end of data sheet.
Pin Configuration appears at end of data sheet.
MAX3746
MAX3744 TIA
DS1859
3-INPUT DIAGNOSTIC
MONITOR
R1
3kΩ
C1
0.1µF
IN+
IN-
RSSI TH DISABLE LOS
OUTPOL V CC
GND
4.7kΩ TO 10kΩ
LOS
2.97V TO 3.6V
OUT+
50Ω
0.1µF
OUT-
50Ω
0.1µF SERDES
R TH = 14kΩ
SUPPLY FILTER HOST FILTER
V CC _RX 4-PIN TO HEADER
HOST BOARD SFP OPTICAL RECEIVER
Typical Operating Circuits