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产品描述:
CS6716 integrated three main functions in a single chip providing optimal solutions for various fiber module applications. The functional blocks include a 1.25G 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 output of the post-amplifier can be configured as either PECL or CML. 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 TXP/TXN and convert to drive LD output driver. The LD driver is also controlled by burst-enable signal BEN/BEP. 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. The boot ROM is responsible for uploads the user program from external serial EEPROM. The ISP/IAP is through I2C slave interface which also serves as SFP/SFF DMM function.

CS6716 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 CS6716, the module can achieve low cost and high performance fiber module and can be applied in FTTH, BPON, and GEPON.

 Features:

• 

155MBPS - 1.25GBPS

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-3dB bandwidth 850MHz  20KHz

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2mV sensitivity

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On-chip offset cancellation

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Programmable signal detect level and hysteresis

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Programmable LOS function and Power detection
-SD control
-Peak/ADC control
-External Monitor/ADC control

• 

Programmable PECL/CML/CMOS output

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Programmable power down

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Bias current up to 100mA

• 

Differential modulation current outputs up to 80mA

• 

Programmable bias and modulation current control

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Digital automatic power control loop
-Open or close loop
-Loop monitoring by MCU

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Rise/Fall time < 200psec

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Burst or continuous mode compatible

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Programmable polarity and TX fail function

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Programmable power down and TX enable/disable function

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RISC CPU - 10MHz
-2K Program ROM for Boot
-2K Program SRAM for user program uploaded
-Watchdog timer
-Low voltage reset

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I2C master for EEPROM program upload and data storage

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I2C slave for host ISP/IAP

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SFP 8472 and SFF Digital Monitoring Interface

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8-Channel 12-bit ADC

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12-bit R2R DAC

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On-chip temperature sensor

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Low power consumption (300mW)

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Single 3.3V supply with on-chip regulator

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Single 3.3V supply with on-chip regulator

• 

LQFP-32 (155Mbps) or QFN-32 (1.25Gbps)

• 

RoHS compliance package

 Application:

• 

SONET/SDH, FTTH, GEPON

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