LTC5100EUF#PBF Linear Technology, LTC5100EUF#PBF Datasheet - Page 37

• Manufacturer Part Number: LTC5100EUF#PBF
• Description: IC DRIVER VCSEL 3.2GBPS 16QFN
• Manufacturer: Linear Technology
• Type: Laser Diode Driverr

Specifications of LTC5100EUF#PBF

• Data Rate: 3.2Gbps
• Number Of Channels: 1
• Voltage - Supply: 3.135 V ~ 3.465 V
• Current - Supply: 54mA
• Current - Modulation: 12mA
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 16-QFN
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 12. Register: IB (IMD)—Laser Bias Current Register (Monitor Diode Current in APC Mode) (I
REGISTER
Table 13. Register: IB_TC1 (IMD_TC1)—Laser Bias/Monitor Diode Current First Order Temperature Coefficient
(I
REGISTER
REGISTER DEFI ITIO S
.BITFIELD
.Reserved
.Is_rng
.Ib_nom
(.Imd_nom in
APC Mode)
2
.BITFIELD
.Reserved
.Ib_tc1 (.Imd_tc1
in APC Mode)
C Command Code 0x16)
15:12
15:8
BIT
BIT
11
10
9
8
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
RESET VALUE
RESET VALUE
U
(BIN)
(BIN)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
U
See the Electrical Specifications for Guaranteed Limits in Each Range.
FUNCTION AND VALUES
Source Current Range
Is_rng Sets the Full-Scale Range of the SRC Pin Current. The Table Below Shows the Available Ranges.
Values for Is_rng
Bias Current or Monitor Diode Current Setting at the Nominal Temperature
This Bit Field has Different Functions Depending on Apc_en.
This Bit Field is an Unsigned 10-Bit Integer.
Constant Current Control (CCC) Mode (Apc_en = 0): Ib_nom Sets the Laser Bias Current at
Temperature T = T_nom. The physical Bias Current at T_nom is Given by:
Automatic Power Control (APC) Mode (Apc_en = 1): Imd_nom Sets the Monitor Diode Current at the
Temperature T = T_nom. The Physical Monitor Diode Current at T_nom is Given by:
FUNCTION AND VALUES
First Order Temperature Coefficient for Bias Current or Monitor Diode Current
This Bit Field is a Signed 8-Bit, Two’s Complement Integer. Thus its Value Ranges from –128 to 127.
This Bit Field has Different Functions Depending on Apc_en.
Constant Current Control (CCC) Mode (Apc_en = 0): Ib_tc1 Sets the First Order Temperature
Coefficient for the Laser Bias Current. The Nominal Scaling is 2
Automatic Power Control (APC) Mode (Apc_en = 1): Imd_tc1 Sets the First Order Temperature
Coefficient for the Monitor Diode Current. See Laser Bias Current Control in APC Mode
in the Operation Section for Details.
Binary
I
Value
MD
I =
00
01
10
11
B
4 25
Ib_nom
.
1024
Decimal
A
Value
•
0
1
2
3
• ( _
4
Im _
Is rng
d rng
Scale SRC Pin
Nominal Full-
Current (mA)
• exp ln( )•
1 9
) •
18
27
36
9
mA
8
(typical)
Im _
1024
d nom
2
C Command Code 0x15)
–13
/ C or 122ppm/ C per LSB.
LTC5100
sn5100 5100fs
37