VSC7978

The VSC7978 is a 9.9 Gbps 11.3 Gbps high performance, low power transimpedance amplifier designed for use in TO-46 Can based Receiver Optical Sub Assemblies (ROSA) for optical communication networks; SONET/SDH (OC- 192/STM-64), 10G Ethernet, 10G Fiber Channel and OTN applications. The device is intended for use with a PIN photo detector or APD, and is capable of amplifying input currents of up to and greater than 3.5mAp-p with low duty-cycle distortion. The VSC7978 offers 4kohm differential transimpedance, eliminating the need for an additional postamplifier.

The outputs limit to a typical differential value of 300mVp-p, increasing the dynamic range of the system by reducing the possibility of exceeding the input voltage range of the transceiver device. A space-saving filter connection is provided for a positive bias to the photo detector through a 50ohm resister to external VCCPD. The VSC7978 operates at 3.3V power supply and is offered as bare die form.