Features: ` Dual-Rate 1.0625Gbps/2.125Gbps Operation
` On-Chip Selectable 4th-Order Filter
` Relaxation Oscillation Suppression of Legacy,CD Laser-Based Transmitters
` Available in 100 and 150 Output Terminations
` Programmable Loss-of-Signal (LOS) Threshold
` Output Squelch Control
` Power-On Reset Minimizes Inrush Current
` 4mm* 4mm 16-Pin QFN PackagesApplication·Fibre Channel GBIC Optical Modules
·Dual-Rate Fibre Channel SFF/SFP Optical ModulesPinout
SpecificationsSupply Voltage (VCC) .......................................-0.5V to +6.0V
Continuous CML Output Current
(OUT+, OUT-) ...............................................-25mA to +25mA
CML Input Voltage (IN+, IN-) .................-0.5V to (VCC + 0.5V)
Differential Input Voltage (IN+, IN-)................................2VP-P
TTL Input Voltage
(BWSEL, SQUELCH, TEST)........................-0.5V to (VCC + 0.5V)
Voltage at TH ............................................-0.5V to VCC + 0.5V
Current into TH...............................................................5.0mA
Open Collector (LOS, LOS).................................-0.5V to +5.5V
Operating Ambient Temperature Range .......-40°C to +85°C
Storage Ambient Temperature Range.........-55°C to +100°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DescriptionThe MAX3274/MAX3276* dual-rate Fibre Channel limiting amplifiers are 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 relaxation oscillation (RO) found in legacy transmitters. The amplifiers accept a wide range of input voltages and provide constant-level output voltages with controlled edge speeds. Receivers using the MAX3275/MAX3277 transimpedance amplifiers (TIA) and the MAX3274/MAX3276 dual-rate limiting amplifiers can meet the Fibre Channel receiver sensitivity optical modulation amplitude (OMA) specification of 49mWP-P at 2.125Gbps and 31mWP-P at 1.0625Gbps. Additional features include a programmable threshold loss-ofsignal (LOS) detector, output squelch, and bandwidth select. The MAX3274/MAX3276 feature current-mode logic (CML) data outputs. The MAX3274/MAX3276 are available in 16-pin QFN packages, making them ideal for GBIC and small form-factor receiver modules.
*Future product
MAX3276 Data Sheet
