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Design Note:

HFDN-18.0

Rev.1; 04/08

The MAX3865 Laser Driver with Automatic

Modulation Control

Maxim Integrated Products

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Summary of Contents for MAX3865

Page 1: ...Design Note HFDN 18 0 Rev 1 04 08 The MAX3865 Laser Driver with Automatic Modulation Control Maxim Integrated Products...

Page 2: ...urrent because this will cause an unpredictable start up delay and a poor waveform due to relaxation oscillation in addition to increased noise and degraded laser spectral properties chirp On the othe...

Page 3: ...sed as input to a classical feedback control system in which the forward path consists of a high gain current amplifier plus the laser acting in cascade and the monitor diode constitutes the feedback...

Page 4: ...ion waveform is filtered out so Pmax Pmin and the difference between them are not controlled Automatic power control APC is achieved but not automatic modulation control AMC Laser driver systems incor...

Page 5: ...er of Figure 3 is known Then the peak peak data or modulation current in the laser is known and the pilot tone current is known At the output of the monitor diode the modulation component of current i...

Page 6: ...urrent output DACs As noted the maximum current that flows in any programming resistor is about 200 A Bias output current is programmed in 3 by connecting a resistor to ground 480 k 2 V 2 1 480 bias_m...

Page 7: ...an inductor must be zero The actual output voltage swings about this mean rising above Vcc when the instantaneous modulation current is small and falling below it when the current is large Referring t...

Page 8: ...ark density multiplier goes positive and adds to the bias reference current The numerical details in Figure 4 are such that this increase in effective reference current compensates exactly for the loc...

Page 9: ...pen collector output pins BIAS_MON and MOD_MON and noting when these approach limit values 48 _ bias mon bias I I 21 32 mod mod_ I I mon 22 If outputs BIAS_MON and MOD_MON are not used these pins shou...

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