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 relaxation 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 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-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.
The MAX3274 dual‑rate Fibre Channel limiting amplifier is optimized for 2.125 Gbps and 1.0625 Gbps optical receiver systems. It features an on‑chip selectable fourth‑order Bessel‑Thompson filter, programmable loss‑of‑signal detection, output squelch, and CML data outputs. The device is supplied in a 16‑pin QFN package suitable for GBIC and small‑form‑factor modules.
Typical applications include Fibre Channel GBIC optical modules and SFF/SFP optical transceivers. The datasheet provides absolute maximum ratings, electrical characteristics, pin descriptions, and design guidelines for AC‑coupling, LOS threshold programming, and jitter performance.
| Supply Voltage (VCC) | -0.5 V to +6.0 V |
|---|---|
| Data Rate | 1.0625 Gbps / 2.125 Gbps |
| Typical Output Current | 24 mA |
| Package | 16‑pin QFN, 4 mm × 4 mm |
The MAX3274 operates from –0.5 V up to +6.0 V on its VCC pin.
It supports dual‑rate operation at 1.0625 Gbps and 2.125 Gbps.