Post amplifier boosts fiber optics receivers

San Jose, Calif.&#8212Micrel's SY88343DL, a 3.2 Gbps common-mode logic (CML), limiting post amplifier with high-gain TTL loss-of-signal detection circuitry, improves fiber-optic receiver designs. Applications include APON, BPON, EPON, GEPON, and GPON; Gigabit Ethernet; 1X and 2X Fibre Channel; and SONET/SDH applications.

“This product is ideally suited for multi-rate applications where the same post amplifier is optimized to operate over a wide range of data rates, 155 Mbps to 3.2 Gbps, without using an external capacitor or any special compensation,” said Thomas S. Wong, vice president for high bandwidth products. “It is also best-suited for applications requiring a very sensitive loss-of-signal (LOS) detection.”

In the typical fiber optics module, the SY88343DL connects to a transimpedance amplifier (TIA). The linear signal output from a TIA may contain significant noise. The SY88343DL quantizes the amp's output to minimize these noise levels. The chip features has high gain: Low-amplitude signals (5 mV p-p) will drive devices with CML inputs or AC-coupled CML/PECL inputs. The IC operates from a single 3.3-volt power supply.

Click here for the product datasheet. The device, in a 3-by-3 mm 16-pin MLF package, is priced starting at $2.40 in 1k quantities.

Micrel , 1-408-944-0800,

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