MAX3825

+3.3V, 2.5Gbps, Quad, Transimpedance Amplifier for System Interconnects

Quad 2.5Gbps Low-Power 2R Receiver Chipset

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Overview

Single +3.3V Supply
93mW per channel Power Dissipation
460nA_RMS Input-Referred Noise
20ps Deterministic Jitter
2.4GHz Small-Signal Bandwidth
No External Compensation
40dB Power-Supply Rejection Ratio
Compact Die with 250µm Channel Pitch
100Ω Differential Output Impedance

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