M02094 Datasheet, PDF (14/44 Pages) M/A-COM Technology Solutions, Inc. – 3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 2 Gbps

M02094 Data Sheet
Table 2-1.
Pin
Number
Pin Definitions
Pin Name
Pin equivalent load
10
BIAS_MON
See MOD_MON drawing
V_CC
V_CC3
TxPwr _MON
11
TxPwr_MON
33 Ω
Function
Bias Current Monitor. Connect to a resistor to GND.
The current through this pin is typically:
1/45.7th of the BIAS current to the laser when CC_SEL is low
1/13.5th of the BIAS current to the laser when CC_SEL is high
This pin may be left open if the feature is not needed and the M02094 current
consumption will be reduced by 0.5mA typically.
Transmit Power Monitor. Connect to a resistor to GND.
The current through this pin is approximately the same as the photodiode
current into I_PIN. The current out of this pin is low pass filtered (no external
filtering required).
This pin may be left open if the feature is not needed and the M02094 current
consumption will be reduced by the I_PIN current.
V_CC
12
APC_SET
APC_SET
V_CC3
Average Power Control, laser bias current adjustment. Connect to a resistor
between this pin and ground to set the bias current to the laser.
The APC loop will adjust the laser bias current to maintain a voltage at APC_SET of
approximately 1.3V. The current sourced from this pin is approximately the same
as the current into I_PIN.
V_CC
For CC_SEL low - Current input from monitor photodiode anode.
V_CC3
The APC loop will adjust the laser bias current to maintain a voltage at APC_SET of
approximately 1.3V and at this pin of approximately one V_GS.
I_PIN
13
I_PIN
For CC_SEL high - Current source for monitor photodiode cathode.
The APC loop will adjust the laser bias current to maintain a voltage at APC_SET of
approximately 1.3V and at this pin of approximately one V_GS below V_CC3.
33 Ω
14
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02094-DSH-001-C
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