参数资料
型号: LTC5100EUF#TRPBF
厂商: Linear Technology
文件页数: 18/52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
OPERATIO
current, I M . The maximum value of I S is given in the
V
Electrical Characteristics and the value of I M depends on
the laser characteristics and the termination resistor value.
The logic “1” and “0” current levels in the laser are given
by:
V LD
R LD
I 1 = I B +
I MOD
2
(4)
I 0 = I B –
I MOD
2
(5)
I0
I B
I1
I LD
5100 F15
I B
I TH
0
5100 F14
I MOD
Figure 15. Approximate VI Curve for a Laser Diode
L
P1
Figure 14. Components of the Laser Bias
and Modulation Currents
The power levels corresponding to I1 and I0 are P1 and P0,
as shown in Figure 16.
P AVG
η
P1 = η (I1 – I TH )
(6)
P0 = η (I0 – I TH ) (7)
where η is the slope efficiency and Ith is the laser threshold
P0
I TH
I0
I B
I1
I LD
5100 F15
current, defined in Figure 16.
The average optical power and extinction ratio are given
by:
I MOD
Figure 16. Approximate LI Curve for a Laser Diode
P AVG =
P1 + P0
2
(8)
The voltage across the termination resistor is:
V TERM = V SRC – V MODA
(11)
ER =
P1
P 0
(9)
= Is ? R T
The LTC5100 can digitize the voltage across the termina-
The average voltage on the laser diode relative to ground
is V LD (see Figure 12 and Figure 15). The voltage on the
SRC pin is:
tion resistor using the on-chip ADC, which can give a more
accurate measurement of Is than that given by digitizing
the current internally. See the Electrical Characteristics for
V S = V LD + I S ? R T
(10)
details.
= V LD + (I B + I M ) ? R T
The value V S is important because V S must not exceed the
limits given in the Electrical Characteristics.
Temperature Compensation
The LTC5100 digitally compensates the temperature drift
of the laser bias current, laser modulation current and
sn5100 5100fs
18
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