参数资料
型号: LTC5100EUF
厂商: Linear Technology
文件页数: 38/52页
文件大小: 0K
描述: IC DRIVER VCSEL 3.2GBPS 16QFN
标准包装: 91
类型: 激光二极管驱动器
数据速率: 3.2Gbps
通道数: 1
电源电压: 3.135 V ~ 3.465 V
电流 - 电源: 54mA
电流 - 调制: 12mA
工作温度: -40°C ~ 85°C
封装/外壳: 16-WQFN 裸露焊盘
供应商设备封装: 16-QFN(4x4)
包装: 管件
安装类型: 表面贴装
LTC5100
REGISTER DEFI ITIO S
Table 14. Register: IB_TC2 (IMD_TC2)—Laser Bias/Monitor Diode Current Second Order Temperature Coefficient
(I 2 C Command Code 0x17)
REGISTER
RESET VALUE
.BITFIELD
.Reserved
.Ib_tc2 (.Imd_tc2
in APC Mode)
BIT
15:8
7
6
5
4
3
2
1
0
(BIN)
0
0
0
0
0
0
0
0
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 –18 / ° C 2 or 3.81ppm/ ° C 2 per LSB.
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.
Table 15. Register: IM—Laser Modulation Current (I 2 C Command Code 0x19)
REGISTER
RESET VALUE
.BITFIELD
.Reserved
.Im_rng
BIT
15:12
11
10
(BIN)
0
0
FUNCTION AND VALUES
Modulation Current Range
Im_rng Sets the Full-Scale Range of the Modulation Current
Binary
Decimal
Nominal Full-Scale MODA and MODB Pin Current
Value
Value
Peak-to-Peak (mA) Average (mA)
00
01
10
11
0
1
2
3
9
18
27
36
4.5
9
13.5
18
See the Electrical Specifications for Guaranteed Limits in Each Range.
These Currents Represent the Peak-to-Peak Current at the MODA and MODB Pins. (The MODA and
MODB Pins are Tied Together On Chip).
.Im_nom
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
0
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.
sn5100 5100fs
38
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