VSC7978 – 9.9 Gbps to 11.3 Gbps Transimpedance Amplifier
High Gain Transimpedance Amplifier for TO-Can Based ROSA Applications
Description:
The VSC7978 is a 9.9 Gbps to 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.
Features :
- TO-46 Can Compatible Die Size
- 4k ohm Differential Transimpedance Gain
- Low Power, 140mW typ.
- Photodetector Cusrrent Monitor Voltage Output
- Single +3.3V Power Supply
- Integrated Photo Detecotor Bias Circuit
Benefits:
- Lowest Cost 10 Gbps ROSA Solution Designed Specifically
for High Volume XFP Module Applications
Specifications:
- Transimpedance Gain 4k ohm Differential
- Low Frequency Cutoff 30kHz
- Overload Current 4.5mA
- Limiting Output 360mV Differential
- 3dB Bandwidth in a TO-46 Can 8GHz
- NOTE: All Specifications are Typical
Diagram:
Source: Vitesse
