622Mbps, Ultra-Low-Power, 3.3V Transimpedance Preamplifier for SDH/SONET
DescriptionThe 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.
- +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
- PIN Photodiode Preamplifiers and Receivers
- Regenerators for SDH/SONET
- SDH/SONET Receivers
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Technical DocumentsApp Note 1788 HFAN-06.2: IBIS Data for CML, PECL, and LVDS Interface Circuits
App Note 1102 HFAN-09.0.3: APON Class A, B, & C Physical Layer Requirements
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