LTC5100EUF#TR Linear Technology, LTC5100EUF#TR Datasheet - Page 38

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

Specifications of LTC5100EUF#TR

• 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: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC5100
Table 14. Register: IB_TC2 (IMD_TC2)—Laser Bias/Monitor Diode Current Second Order Temperature Coefficient
(I
REGISTER
Table 15. Register: IM—Laser Modulation Current (I
REGISTER
REGISTER DEFI ITIO S
38
2
.BITFIELD
.Reserved
.Ib_tc2 (.Imd_tc2
in APC Mode)
.BITFIELD
.Reserved
.Im_rng
.Im_nom
C Command Code 0x17)
15:12
15:8
BIT
BIT
11
10
7
6
5
4
3
2
1
0
9
8
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
These Currents Represent the Peak-to-Peak Current at the MODA and MODB Pins. (The MODA and
MODB Pins are Tied Together On Chip).
See the Electrical Specifications for Guaranteed Limits in Each Range.
FUNCTION AND VALUES
Second 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_tc2 Sets the Second Order Temperature
Coefficient for the Laser Bias Current. The Nominal Scaling is 2
Automatic Power Control (APC) Mode (Apc_en = 1): Imd_tc2 Sets the Second Order Temperature
Coefficient for the Monitor Diode Current. See Laser Bias Current Control in APC Mode
in the Operation Section for Details.
FUNCTION AND VALUES
Modulation Current Range
Im_rng Sets the Full-Scale Range of the Modulation Current
Modulation Current Setting at the Nominal Temperature
This Bit Field is an Unsigned 10-Bit Integer. Im_nom Sets the Average Modulation Current Delivered at
the MODA and MODB Pins. (The MODA and MODB Pins are Tied Together On Chip).
The Peak-to-Peak Current is Twice the Average Current for a Data Stream with 50% Duty Cycle.
The Modulation Current Reaching the Laser Depends on its Dynamic Resistance Relative to the
Termination Resistor.
Binary
Value
00
01
10
11
2
C Command Code 0x19)
Decimal
Value
0
1
2
3
Nominal Full-Scale MODA and MODB Pin Current
Peak-to-Peak (mA)
18
27
36
9
Average (mA)
13.5
4.5
18
9
–18
/ C
2
or 3.81ppm/ C
2
per LSB.
sn5100 5100fs