参数资料
型号: LTC5100EUF#TR
厂商: Linear Technology
文件页数: 37/52页
文件大小: 0K
描述: IC DRIVER VCSEL 3.2GBPS 16QFN
标准包装: 2,500
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: 带卷 (TR)
安装类型: 表面贴装
LTC5100
REGISTER DEFI ITIO S
Table 12. Register: IB (IMD)—Laser Bias Current Register (Monitor Diode Current in APC Mode) (I 2 C Command Code 0x15)
REGISTER
RESET VALUE
.BITFIELD
.Reserved
.Is_rng
BIT
15:12
11
10
(BIN)
0
0
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
Nominal Full-
Binary
Value
00
01
10
11
Decimal
Value
0
1
2
3
Scale SRC Pin
Current (mA)
9
18
27
36
See the Electrical Specifications for Guaranteed Limits in Each Range.
.Ib_nom
(.Imd_nom in
APC Mode)
9
8
7
6
5
0
0
0
0
0
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:
4
3
0
0
I B =
Ib_nom
1024
? ( Is _ rng + 1 ) ? 9 mA (typical)
2
1
0
0
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:
I MD = 4 . 25 μ A ? 4 Im d _ rng ? exp ? ln( 8 ) ?
?
?
0
0
?
?
Imd _ nom ?
1024
Table 13. Register: IB_TC1 (IMD_TC1)—Laser Bias/Monitor Diode Current First Order Temperature Coefficient
(I 2 C Command Code 0x16)
REGISTER
RESET VALUE
.BITFIELD
.Reserved
.Ib_tc1 (.Imd_tc1
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
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 –13 / ° C or 122ppm/ ° C per LSB.
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.
sn5100 5100fs
37
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