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CS6718 integrated two main functions in a single chip providing optimal solutions for various fiber module applications. The functional blocks include a 1.25G post-amplifier, a continuous mode LD driver.

The post-amplifier receives AC coupled differential signal from pre-amplifier and performs the quantization amplifications. There are total four amplification stages excluding the output stage. The offset cancellation is built-in on chip. The output of the post-amplifier is configured as PECL. The LOS power threshold level is configurable by SD_SET voltage.

CS6718 integrates essential building blocks for Fiber module design. Using CS6718, the module can achieve low cost and high performance fiber module and can be applied in FTTH, BPON, and GEPON.



Post Amplifier 
• 155MBPS - 1.25GBPS 
• -3dB bandwidth 850MHz  20KHz 
• 2mV sensitivity 
• On-chip offset cancellation 
• Programmable LOS function and Power detection 
刋 - External ADC channel control 
• LOS/SD programmable PECL/CMOS output 
• Programmable power down 


LD Driver 
• Bias current up to 100mA 
• Differential modulation current outputs up to 80mA 
• Programmable bias and modulation current control 
• Digital automatic power control loop 
• Rise/Fall time < 200psec 
• Continuous mode compatible 


• Low power consumption (300mW) 
• Single 3.3V supply with on-chip regulator 
• Extended temperature range -40oC ~ +85oC 
• QFN-28 
• RoHS compliance package 




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