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参数资料
| 型号： | LTC5100EUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 20/52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 |
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LTC5100
OPERATIO
Figure 17 depicts the current ranges for the source cur-
rent. The guaranteed full scale is 6mA per range. The
minimum operating level should be limited to 1/16 of full
scale to avoid the coarse relative quantization seen in any
ADC or DAC when operated at low levels. The source
range, Is_rng, should be selected as low as possible such
that the source current, I S , stays within the guaranteed
current limits over temperature, considering the laser
temperature characteristics. From Equation 1 we can see
that the source current is the sum of the laser bias and the
average modulation currents:
Figure 18 depicts the current ranges for the average
modulation current. This is the average modulation cur-
rent at the MODA and MODB pins of the chip (recall that the
MODA and MODB pins are connected on-chip). The peak-
to-peak modulation at the pins of the chip is twice the
average. Guaranteed full scale is 3mA average or 6mA pp
per range. The minimum operating level should be limited
to 1/8 of full scale to preserve the quality of the eye
diagram. Operating below 1/8 full scale causes increased
overshoot and undershoot. The modulation range, Im_rng,
should be selected as low as possible such that the
I S = I B + I M
(15)
modulation current, I M , stays within the guaranteed cur-
rent limits over temperature. The modulation current
Is_rng should be chosen to support the total current
required for laser bias and modulation, taking temperature
changes in I B and I M into account.
varies over temperature to compensate the loss in slope
efficiency typical of most VCSELs. Therefore, the choice of
Im_rng should take temperature changes into account.
36
I S (mA)
Is_rng = 3
High Speed Aspects of the Modulation Output
The LTC5100 modulation output presents a resistive drive
27
Is_rng = 2
impedance with very low reflection coefficient. This output
design suppresses ringing and reflections to maintain the
quality of the eye diagrams in spite of laser impedance
18
Is_rng = 1
variations. The reflection coefficient is sufficiently low that
the LTC5100 can drive the laser over an arbitrary length of
9
4.5
0
Is_rng = 0
RECOMMENDED
MINIMUM IS 1/16
OF FULL SCALE
5100 F17
transmission line, as shown in Figure 19. A well designed
transmission line stretching the entire length of a typical
transceiver module goes virtually unnoticed in this sys-
tem. The only practical limitation on interconnect length to
the laser is high frequency line loss.
Figure 17. Ranges for the Source Current
LTC5100
V DD
18
13.5
I M (mA)
Im_rng = 3
Im_rng = 2
C1
L BWA
SRC
MODA
14
11
I S
C T
10nF
R T
50 ?
TYP
I S = I B + I M
9
Im_rng = 1
RECOMMENDED
3.2Gbps
MODULATOR
L BWB
I M
MODB
10
Z O = R T
TRANSMISSION
LINE
I B
4.5
MINIMUM IS 1/8
OF FULL SCALE
M1
0
Im_rng = 0
5100 F18
V SS
Figure 18. Ranges for the Modulation Current
Figure 19. High Speed Details of the Modulation Output
sn5100 5100fs
20
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