te c h t m I7520N tm technology inc. reserves the right p. 1 to change products or specifications without notice . c reate 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 lo w cost serial eeprom or microcontroller it forms a complete pon diplexer silicon solution. the transmit block includes a high frequency modula tor 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 pro grammable bandwidth. a signal detect/loss off signal function is implemented usin g the input signal modulation amplitude with user selectable threshold and hysteresis. operating with a 3.3v supply and rated from -40 to +85c 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(f ttp) broadband access systems features burst-mode common anode laser driver with up to 90 ma modulation and 100ma bias current 4ns output switching in burst mode operation. closed or open loop bias mode with temperature loo kup table. temperature compensated modulation current setting stored in look up table limiting amplifier with programmable low pass filt er and output swing device settings stored in external 2k eeprom or mc u 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
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