MAX3825

The MAX3825 is a quad transimpedance amplifier (TIA) intended for 2.5Gbps system interconnect applications. Each of the four channels converts a small photodiode current to a measurable differential voltage with a transimpedance gain of 3.7kohm. The circuit features 460nA_RMS of input-referred noise per channel corresponding to an optical input sensitivity of -22.3dBm (BER < 1 x 10^-14). The quad transimpedance amplifier has 20ps of deterministic jitter and a 2.4GHz small-signal bandwidth. The MAX3825 is optimized for use with a quad PIN photodetector array with a standard fiber pitch of 250µm.

The MAX3825 operates from a single +3.3V supply over a 0°C to +85°C temperature range. With a +3.3V supply, each channel dissipates 93mW of power. A DC cancellation circuit on each channel provides a true differential output swing over a wide range of input currents.

Each channel has an independent supply and ground to allow all or any combination of channels to be connected. This device is available in dice only.

Applications

• ATM Switch Networks
• Backplane and Interconnect Applications
• Dense Digital Cross-Connects
• High-Speed Parallel Optical Links
• SDH/SONET
• System Interconnects