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MAX3665：622Mbps, Ultra-Low-Power, 3.3V Transimpedance Preamplifier for SDH/SONET

The MAX3665 low-power transimpedance preamplifier for 622Mbps SDH/SONET applications consumes only 70mW at VCC = 3.3V. Operating from a single +3.3V or +5.0V supply, it converts a small photodiode current to a measurable differential voltage. A DC cancellation circuit provides a true differential output swing over a wide range of input current levels, thus reducing pulse-width distortion. The differential outputs are back-terminated with 50Ω per side. The overall transimpedance gain is nominally 8kΩ. For input signal levels beyond approximately 50µAp-p, the amplifier will limit the output swing to 250mV. The MAX3665's low 55nA input noise provides a typical sensitivity of -33.2dBm in 1300nm, 622Mbps receivers. The MAX3665 is designed to be used in conjunction with the MAX3676 clock recovery and data retiming IC with limiting amplifier. Together they form a complete 3.3V or 5.0V 622Mbps SDH/SONET receiver. In die form, the MAX3665 is designed to fit on a header with a PIN diode. It includes a filter connection that provides positive bias for the photodiode through a 1.5kΩ resistor to VCC. The device is available in an 8-pin µMAX® package.

Key Features +3.3V or +5.0V Single-Supply Operation 55nARMS Input-Referred Noise 70mW Power Consumption at VCC = 3.3V 8kΩ Gain 450µA Peak Input Current 260ps (max) Deterministic Jitter Differential Output Drives 100ΩLoad 470MHz Bandwidth

MAX3665: Typical Application Circuit Applications/Uses PIN Photodiode Preamplifiers and Receivers Regenerators for SDH/SONET SDH/SONET Receivers

DataSheet

Parametrics

Design kits & evaluation modules

• MAX3665EVKIT

Quality and Environmental Data

• MAX3665.pdf

Related Products

• MAX3680：+3.3V, 622Mbps, SDH/SONET 1:8 Deserializer with TTL Outputs
• MAX3676：622Mbps, 3.3V Clock-Recovery and Data-Retiming IC with Limiting Amplifier
• MAX3681：+3.3V, 622Mbps, SDH/SONET 1:4 Deserializer with LVDS Outputs

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