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CX02068WAFER データシート(PDF) 10 Page - M/A-COM Technology Solutions, Inc.

部品番号 CX02068WAFER
部品情報  3.3 Volt Laser Driver IC for 155/622 Mbps
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メーカー  MA-COM [M/A-COM Technology Solutions, Inc.]
ホームページ  http://www.macomtech.com
Logo MA-COM - M/A-COM Technology Solutions, Inc.

CX02068WAFER データシート(HTML) 10 Page - M/A-COM Technology Solutions, Inc.

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Functional Description
02068-DSH-001-C
Mindspeed Technologies
®
8
Mindspeed Proprietary and Confidential
3.4
Mean Power Control Loop
To maintain constant average optical power, the CX02068 incorporates a control loop to compensate for the
changes in laser threshold current over temperature and lifetime. A monitor photodiode mounted in the laser
package is used to convert the optical power into a photocurrent. The MPC loop adjusts the laser bias current so
that the monitor current is matched to a reference current set by a single external resistor (RMPCSET). The time
constant of the loop is then determined by CMPC.
Safety logic is provided in order to limit the maximum bias current. The bias current at which the safety logic trips
is set by an external resistor to ground (ROCA) from the OCASET pin. When the bias current limit is reached alarm
flag OCA is asserted LOW. A loop failure alarm is also provided to detect when the bias current can no longer be
adjusted to achieve the desired average optical power.
Figure 3-3.
Typical bias current vs RBIASSET (3.3V)
Figure 3-4.
Typical limiting current vs ROCA (at 25 °C)
0
20
40
60
80
100
120
0
10000
20000
30000
40000
R
BIASSET (Ω )
0
10
20
30
40
50
60
70
80
90
100
0
10000
20000
30000
40000
R
OCA (Ω )


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