MAX3825

19-1855 Rev 0; 11/00 MAX3825 +3.3V, 2.5Gbps Quad Transimpedance Amplifier for System Interconnects General Description 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 3.7kΩ. The circuit features 460nARMS of input-referred noise per channel corresponding to an optical input sensitivity of -22.3dBm (BER ≤ 1 × 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. Typical Operating Circuit appears at end of data sheet. Features o Single +3.3V Supply o 93mW per Channel Power Dissipation o 460nARMS Input-Referred Noise o 20ps Deterministic Jitter o 2.4GHz Small-Signal Bandwidth o No External Compensation o 40dB Power-Supply Rejection Ratio o Compact Die with 250µm Channel Pitch o 100Ω Differential Output Impedance Order...