2 2 . . 5 5 g g b b p p s s l l a a s s e e r r d d r r i i v v e e r r a a n n d d i i n n t t e e g g r r a a t t e e d d l l i i m m i i t t i i n n g g a a m m p p l l i i f f i i e e r r i i n n a a 5 5 x x 5 5 m m m m q q f f n n p p a a c c k k a a g g e e the m02090 is a highly integrated, programmable burst- mode laser driver with a limiting amplifier intended for onu/olt applications up to 2.5 gbps. the m02090 offers a single, flexible solution that addresses all pon applications of bpon, gepon and gpon. capable of independently driving 100 ma of modulation current and 80 ma of bias current, the laser driver in the m02090 can independently control bias and modulation currents via the eye-minder tm , a dual closed-loop that maintains the target extinction ratio by compensating for laser aging, temperature, and voltage changes. open-loop and average closed-loop configurations are also supported. the limiting amplifier inputs in the m02090 have selec- table bandwidth. the input sensitivity is less than 3 mv at 1.25 gbps, and less than 6 mv at 2.5 gbps. the positive emitter-coupled logic (pecl) differential outputs achieve full swing at the minimum specified input signal. also included are features such as programmable loss of signal, received signal strength indication and jam func- tion, which can be used to squelch chatter on the outputs when no signal is present. many features of the m02090 can be accessed through a 2-wire interface by an external microcontroller or the device can operate independently with an external eeprom. the m02090 is offered in a compact 32 pin, 5mm x 5mm qfn package and is specified over an extended operating temperature range of -40oc to +100oc. > integrated 2.5 gbps burst- mode driver with limiting amplifier > up to 100ma of modulation current and 80ma of bias current > dual 2-wire interface enables operation inde- pendently or with an external microcontroller > dual digital closed-loop architecture, enables real time extinction ratio control > 2.5 ns burst on/off time > extended temperature range of -40 oc to +100 o c > > k k e e y y f f e e a a t t u u r r e e s s 3 3 . . 3 3 v v b b u u r r s s t t - - m m o o d d e e l l a a s s e e r r d d r r i i v v e e r r a a n n d d i i n n t t e e g g r r a a t t e e d d l l i i m m i i t t i i n n g g a a m m p p l l i i f f i i e e r r w w i i t t h h e e y y e e - - m m i i n n d d e e r r t t m m t t e e c c h h n n o o l l o o g g y y f f o o r r f f i i b b e e r r - - t t o o - - t t h h e e - - p p r r e e m m i i s s e e s s m m 0 0 2 2 0 0 9 9 0 0
w w w w w w . . m m i i n n d d s s p p e e e e d d . . c c o o m m / / s s a a l l e e s s o o f f f f i i c c e e s s general information: (949) 579-3000 headquarters C newport beach 4000 macarthur blvd., east tower newport beach, ca 92660-3007 02090-BRF-001-A ? 2006 mindspeed technologies ? . all rights reserved. mindspeed and the mindspeed logo are trademarks of mindspeed technologies. all other trademarks are the prop- erty of their respective owners. although mindspeed technologies strives for accu- racy in all its publications, thi s material may contai n errors or omissions and is subject to change without notice. this material is provided as is and without any express or implied warranties, including merchantability, fitness for a particular purpose and non-infringement. mindspeed technologies shall not be liable for any special, indirect, incidental or consequential damages as a result of its use. ? fiber-to-the-premises ? passive optical networks - bpon, gepon and gpon p p r r o o d d u u c c t t a a p p p p l l i i c c a a t t i i o o n n s s output buffer outp outn ipin ibias out input buffer d in n d in p tx disable dis v cc3t gnd input buffer benn benp laser driver modulation and bias current control biasing rxoutp rxoutn rssi pk - pk st set los jam rxinn iref rxinp v cc3r output buffer limiting amplifier safety logic (fault detection) fail rssi scl _ m sda _ m scl _s sda _s adc imod gnd 0 temp sensor slave two- wire interface master two-wire interface limiting amplifier and laser driver control registers offset cancel level detect comparator limiting amplifier laser driver los threshold por figure 1: m02090 functional block diagram
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