MAX3274 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – Dual-Rate Fibre Channel Limiting Amplifier

19-2375; Rev 1; 7/03
Dual-Rate Fibre Channel Limiting Amplifier
General Description
The MAX3274 dual-rate Fibre Channel limiting amplifier
is optimized for use in dual-rate 2.125Gbps/1.0625Gbps
Fibre Channel optical receiver systems. An on-chip
selectable fourth-order Bessel Thompson filter offers
15dB (typ) of attenuation at 2GHz to suppress the relax-
ation oscillation (RO) found in legacy transmitters. The
amplifier accepts a wide range of input voltages and
provides constant-level output voltages with controlled
edge speeds. Receivers using the MAX3275/MAX3277
transimpedance amplifiers (TIA) and the MAX3274 dual-
rate limiting amplifier can meet the Fibre Channel receiv-
er sensitivity optical modulation amplitude (OMA)
specification of 49mW_P-P at 2.125Gbps and 31mW_P-P at
1.0625Gbps. Additional features include a programma-
ble threshold loss-of-signal (LOS) detector, output
squelch, and bandwidth select. The MAX3274 features
current-mode logic (CML) data outputs. The MAX3274 is
available in a 16-pin QFN package, making it ideal for
GBIC and small form-factor receiver modules.
Applications
Fibre Channel GBIC Optical Modules
Dual-Rate Fibre Channel SFF/SFP Optical
Modules
Features
o Dual-Rate 1.0625Gbps/2.125Gbps Operation
o On-Chip Selectable 4th-Order Filter
o Relaxation Oscillation Suppression of Legacy,
CD Laser-Based Transmitters
o Available in a 100Ω Output Termination
o Programmable Loss-of-Signal (LOS) Threshold
o Output Squelch Control
o Power-On Reset Minimizes Inrush Current
o 4mm ✕ 4mm 16-Pin QFN Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
PKG.
CODE
MAX3274UGE 0°C to +85°C
16 QFN G1644-1
Typical Operating Circuit
+3.3V
OPTICAL MODULE
RECEIVER SECTION
+3.3V
HOST
SERVER OR SWITCH
HOST V_CC
0.1µF
IN+
V_{CC LOS LOS}
0.1µF
OUT+
4.7kΩ TO 10kΩ
RX LOS
DESERIALIZER
TIA
0.1µF
IN-
0.1µF
OUT-
100Ω
OR 150Ω
MAX3275
MAX3274
TH SQUELCH
GND BWSEL
RATE SELECT
Pin Configurations appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
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