速度 1.25Gbps-2.5Gbps
狀態 Prod
功能 LD, Driver, MCU(3-in-1)
文件 App Note


CS6721 integrates three main functions in a single chip providing optimal solutions for various fiber module applications. The functional blocks include a 2.5G post- amplifier, a 1.25G burst or continuous mode LD driver, and an 8-bit MCU for configuring and controlling the module functions. 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 LOS status is also configurable as a set peak level detection by the post-amplifier or combined with ADC detection on peak level. The LD driver performs the transmit function that receives the PECL differential signal TXINP/TXINN and convert to drive LD output driver. The LD driver is also controlled by burst-enable signal BENN/BENP. The polarity of control can be configured. The laser driver includes differential modulation outputs and DC bias control output. The setting of output power level is controlled through automatic power control loop and is configurable by MCU. The output can be connected to Laser diode either by AC or DC coupled. The transmit path can be enabled or disabled by TXEN signal. The on-chip MCU is the flexibility and versatility of controlling and configurations of fiber module design. Almost all configurations and parameters of the PA and LD driver parameters and can be controlled by MCU through software. The 12-bit ADC associated with MCU can be used to acquire various internal and external analog signals such on-chip temperature sensor and reference voltages. The MCU has 2K boot ROM and 2K SRAM for program storage which can meet the need of application of SFP/PON, Also the boot ROM is responsible for uploads the user program from external serial EEPROM(with capacity of 2k 4k 8k), The I2C slave interface also serves as ISP/IAP interface as well as SFP/SFF DMI function. CS6721 integrates essential building blocks for Fiber module design. The integration of MCU allows precision control to tailor various module applications and facilitates configuration and automatic calibration in the manufacturing process. Using CS6721, the module can achieve low cost and high performance and can be applied in FTTH, BPON, GEPON, and GPON. APPLICATIONS  SONET/SDH, FTTH, GEPON, GPON.



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