LTC5100EUFTR Linear Technology, LTC5100EUFTR Datasheet - Page 36

• Manufacturer Part Number: LTC5100EUFTR
• Manufacturer: Linear Technology
• Type: VCSELr

Specifications of LTC5100EUFTR

• Number Of Channels: 1
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

LTC5100
Table 9. Register: LOOP_GAIN—Control Loop Gain (I
REGISTER
.Reserved
.Ib_gain
(.Apc_gain in APC
Mode)
Im_gain
REGISTER DEFI ITIO S
36
Table 10. Register: PEAKING—High Speed Modulation Peaking (I
REGISTER
Table 11. Register: Reserved—Reserved for Internal Use. This Register is for Test Puposes Only. Do Not Write to this Register
(I
REGISTER
.BITFIELD
2
.BITFIELD
.Reserved
.Peaking
.BITFIELD
.Reserved
.Reserved
.Reserved
C Command Code 0x08)
15:8
15:5
15:7
BIT
BIT
BIT
7
6
5
4
3
2
1
0
4
3
2
1
0
6
5
4
3
2
1
0
RESET VALUE
U
RESET VALUE
RESET VALUE
(BIN)
(BIN)
(BIN)
0
0
1
0
0
0
0
1
1
0
0
0
0
1
0
0
0
1
0
0
U
FUNCTION AND VALUES
Bias Current or APC Loop Gain
This Bit Field Modifies the Open-Loop Gain of the Bias Current Servo Control Loop. The Effect of This
Bit Field Differs in Constant Current Control (CCC) Mode and in Automatic Power Control (APC) Mode.
In CCC Mode, This Bit Field is Called lb_gain. In APC Mode, This Bit Field is Called Apc_gain.
Constant Current Control (CCC) Mode (Apc_en = 0): The Loop Gain and Settling Time are Independent
of Is_rng. The Default Value of Ib_gain Yields Stable but Slow Settling of the Laser Bias Current for
Any Value of Is_rng.
Automatic Power Control (APC) Mode (Apc_en = 1): The Open-Loop Gain of the Bias Current Servo
Loop Depends on the Value of Is_rng. The Default Value of Apc_gain Yields Stable but Potentially Slow
Settling of the Laser Bias Current for any Value of Is_rng.
Modulation Current Loop Gain
This Bit Field Modifies the Open-Loop Gain of the Modulation Current Servo Loop. The Open-Loop.
Gain is Approximately Im_gain/32. The Loop Gain and Settling Time are Independent of Im_rng. The
Default Value of Im_gain Yields Stable but Slow Settling of the Laser Modulation Current.
FUNCTION AND VALUES
Peaking Control for the Modulation Output
This Bit Field Controls the High Speed Peaking of the Modulation Output. Decreasing the Value of
Peaking Increases the Undershoot on the Falling Edge of the Modulation Signal. The Peaking Control
can be Used to Compensate for Slow Laser Turn-Off Characteristics.
FUNCTION AND VALUES
Reserved for Internal Use, Do Not Write.
Reserved for Internal Use, Do Not Write.
2
C Command Code 0x1E)
2
C Command Code 0x1F)
sn5100 5100fs