General Description

The MAX3260 high-speed transimpedance amplifier is ideally suited for Fibre Channel and SDH/SONET applications. An extended dynamic range makes the

MAX3260 useful in optical receiver systems with as much as 25dB of input signal range. A DC-restore feed back network prevents amplifier saturation in all Fibre Channel applications by allowing input currents as high as 900µA to be amplified linearly. To reduce noise, the restore function is disabled at low input levels, allowing detection of signals as small as 2.4µA with a signal-to noise ratio of 10.

The filter output (FILTER) of the MAX3260 provides a convenient voltage source for a photodiode, especially when the circuit will be placed into a TO-style header with the photodiode. The filter output is connected to VCC through a 1kΩ on-chip resistor. In combination with a bypass capacitor, the filter function significantly reduces the amount of noise present at the cathode of the photodiode.

The MAX3260 operates from a single +5V supply consuming only 115mW of power when the output is AC coupled. With 50Ω output termination, it consumes less than 300mW of power.

Features

♦ 1GHz Bandwidth

♦ Single 5V Supply

♦ 25dB Dynamic Range

♦ Optimized for TO-Style Header

Applications

High-Speed Fiber Optics

531Mbps and 1062Mbps Fibre Channel

622Mbps SDH/SONET

Current-to-Voltage Converters

PIN-Preamp Headers