I7520N Datasheet, PDF (1/1 Pages) Taiwan Memory Technology – 2.5Gbps Burst Mode Laser Driver & Post Amplifier

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i7520N
2.5Gbps Burst Mode Laser Driver & Post Amplifier
General Description
The i7520 is a combined burst mode laser driver and limiting amplifier for use within fiber
optic modules for FTTx applications. Used with a low cost serial EEPROM or microcontroller it
forms a complete PON diplexer silicon solution.
The transmit block includes a high frequency modulator and a bias current generator.
The bias current can be controlled either by a fast settling APC loop or in open loop mode
which uses a temperature lookup table.
The receiver includes a limiting amplifier with programmable bandwidth. A Signal
Detect/Loss Off Signal function is implemented using the input signal modulation amplitude
with user selectable threshold and hysteresis.
Operating with a 3.3V supply and rated from -40 to +85°C ambient, the i7520 is housed
in a 32pin, 5x5mm, RoHS compliant, QFN package.
Applications
GEPON/GPON ONU Transmitters
Passive Optical Network (PON) Transmitters
Fiber-to-the-Home(FTTH) and Fiber-to-the-Premises(FTTP) Broadband Access Systems
Features
Burst-Mode common anode laser driver with up to 90mA modulation and 100mA bias current
4ns output switching in Burst Mode operation.
Closed or open loop bias mode with temperature lookup table.
Temperature compensated modulation current setting stored in look up table
Limiting amplifier with programmable low pass filter and output swing
Device settings stored in external 2k EEPROM or MCU
Support TX-SD function
Lock APC Loop in 1 burst signal
Support SPI interface and I2C interface
Integrate APD voltage control
Full compliance with SFF8472 and SFP MSA
TM Technology Inc. reserves the right
P. 1
to change products or specifications without notice.