M02069_17 Datasheet, PDF (24/45 Pages) M/A-COM Technology Solutions, Inc. – 3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps

M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
3.2
Features
• High speed operation; suitable for SFP/SFF applications from 155Mbps to 4.3 Gbps.
• Supports Common Anode VCSEL, Common Cathode VCSEL, or FP LASER. May be used with or without a
monitor photodiode.
• Programmable temperature compensation. Modulation output and bias output can be controlled using the pro-
grammable module controller M02088 or a few discrete resistors.
• Supports DDMI (SFF-8472) diagnostics.
• DC or AC coupled modulation drive.
• Peaking circuit to optimize VCSEL response.
• Low overshoot allows high extinction ratio with low jitter.
• Supports E-PON burst mode with no extra components
• Automatic Laser Power Control, with “Slow-Start”.
• 3.3V or 5V operation
3.3
General Description
3.3.1
Detailed Description
The M02069 laser driver consists of the following circuitry: an internal regulator, common anode/common cathode
configuration control, bias current generator and automatic power control, data inputs, peaking adjust, modulation
current control, modulator output, laser fail indication, disable control, and monitor outputs for the bias current,
modulation current, and transmitted power.
3.3.2
Internal Regulator
The M02069 contains an internal 3.3V regulator so high bit rate performance can be achieved with 5V or 3.3V
power supply.
When operating from a 5V supply (V_CC is connected to +5V), an internal regulator provides a voltage of approxi-
mately 3.3V to the majority of the on-chip circuitry. The on-chip regulator is internally compensated, requiring no
external components. When a 3.3V supply is used (V_CC and V_CC3 connected to 3.3V) the regulator is switched off
and the internal circuitry is powered directly through the V_CC3 supply pin. The decision as to whether or not the
internal regulator is required is made via the VCC3_SEL pin, which also determines whether the safety circuitry
needs to monitor for proper +5V supply voltage.
SV_CC is sourced from V_CC3 through a switch for common anode applications (this pin becomes IB_{OUT_CC} in com-
mon cathode applications). When a fault condition is present, FAIL will assert and the switch sourcing SV_CC will
open so no current can pass through the laser. SV_CC does not need any external capacitance, if capacitance to
ground is added at SV_CC it should be less than or equal to 100pF.
V_CC and V_CC3 status are internally monitored by the M02069 during power-up and normal operation. During
power-up the “slow-start” circuitry requires that V_CC and V_CC3 each reach an acceptable level before enabling bias
or modulation current.
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