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| 型号： | ADN2870ACPZ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC LSR DRVR 3.3GPBS 3.6V 24LFCSP |
| 标准包装： | 1,500 |
| 类型： | 激光二极管驱动器（光纤） |
| 数据速率： | 3.3Gbps |
| 通道数： | 1 |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 30mA |
| 电流 - 调制： | 90mA |
| 电流 - 偏置： | 100mA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 24-LFCSP-VQ（4x4） |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
ADN2870
LASER DIODE INTERFACING
The schematic in Figure 32 describes the recommended circuit
for interfacing the ADN2870 to most TO-Can or coax lasers.
These lasers typically have impedances of 5 Ω to 7 Ω and have
axial leads. The circuit shown works over the full range of data
rates from 155 Mbps to 3.3 Gbps including multirate operation
(with no change to PAVCAP and ERCAP values); see the
examples.
Coax lasers have special characteristics that make them difficult
to interface to. They tend to have higher inductance, and their
operates by deliberately misterminating the transmission line
on the laser side, while providing a very high quality matching
network on the driver side. The impedance of the driver side
matching network is very flat vs. frequency and enables multi-
rate operation. A series damping resistor should not be used.
V CC
The 30 Ω transmission line used is a compromise between drive
current required and total power consumed. Other transmission
line values can be used, with some modification of the compo-
nent values. The R and C snubber values in Figure 32, 24 Ω and
2.2 pF, respectively, represent a starting point and must be
tuned for the particular model of laser being used. R P , the pull-
up resistor, is in series with a very small (0.5 nH) inductor. In
some cases, an inductor is not required or can be accommodated
with deliberate parasitic inductance, such as a thin trace or a via
placed on the PC board.
Care should be taken to mount the laser as close as possible to
the PC board, minimizing the exposed lead length between the
laser can and the edge of the board. The axial lead of a coax
laser is very inductive (approximately 1 nH per mm). Long
exposed leads result in slower edge rates and reduced eye margin.
Recommended component layouts and gerber files are available
by contacting sales at Analog Devices. Note that the circuit in
L (0.5nH)
R P C
24 ? 100nF
V CC
laser, sufficient for most lasers available today. Higher currents
can be accommodated by changing transmission lines and
backmatch values; contact sales at Analog Devices for recom-
R Z
IMODP
ADN2870
IBIAS
CCBIAS
Tx LINE Tx LINE
30 ? 30 ?
V CC
L
BLM18HG601SN1D
R
24 ?
C
2.2pF
mendations. This interface circuit is not recommended for
butterfly-style lasers or other lasers with 25 Ω characteristic
impedance. Instead, a 25 Ω transmission line and inductive
(instead of resistive) pull-up is recommended; contact sales
for recommendations.
Figure 32. Recommended Interface for ADN2870 AC Coupling
L1 = 0.5nH
V CC
The ADN2870 also supports differential drive schemes. These
can be particularly useful when driving VCSELs or other lasers
with slow fall times. Differential drive can be implemented by
adding a few extra components. A possible implementation is
In the circuits shown in Figure 32 and Figure 33, Resistor R Z is
required to achieve optimum eye quality. The recommended
value is approximately 200 Ω ~ 500 Ω.
L4 = BLM18HG601SN1D
R1 = 15 ?
C1 = C2 = 100nF
L3 = 4.7nH
TO-CAN/VCSEL
IMODN
ADN2870
20 ? TRANMISSION LINES
R3
C3
SNUBBER
LIGHT
IMODP
CCBIAS IBIAS
R1 = 15 ?
(12 TO 24 ? )
L5 = 4.7nH
V CC
L2 = 0.5nH
V CC
R Z
L6 = BLM18HG601SN1D
SNUBBER SETTINGS: 40 ? AND 1.5pF, NOT OPTIMIZED,
OPTIMIZATION SHOULD CONSIDER PARASITIC.
Figure 33. Recommended Differential Drive Circuit
Rev. A | Page 16 of 20
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相关代理商/技术参数 |
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|---|---|
| ADN2871 | 制造商:AD 制造商全称:Analog Devices 功能描述:3.3 V, 50 Mbps to 4.25 Gbps Single-Loop Laser Diode Driver |
| ADN2871ACPZ | 功能描述:IC LASER DRIVER 4.25GBPS 24LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 激光驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:激光二极管驱动器 数据速率:- 通道数:4 电源电压:3.3V 电流 - 电源:- 电流 - 调制:- 电流 - 偏置:- 工作温度:0°C ~ 70°C 封装/外壳:40-TQFN 裸露焊盘 供应商设备封装:40-TQFN EP 包装:托盘 安装类型:表面贴装 |
| ADN2871ACPZ-RL | 功能描述:IC LASER DRIVER 4.25GBPS 24LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 激光驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:激光二极管驱动器 数据速率:- 通道数:4 电源电压:3.3V 电流 - 电源:- 电流 - 调制:- 电流 - 偏置:- 工作温度:0°C ~ 70°C 封装/外壳:40-TQFN 裸露焊盘 供应商设备封装:40-TQFN EP 包装:托盘 安装类型:表面贴装 |
| ADN2871ACPZ-RL7 | 功能描述:IC LASER DRIVER 4.25GBPS 24LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 激光驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:激光二极管驱动器 数据速率:- 通道数:4 电源电压:3.3V 电流 - 电源:- 电流 - 调制:- 电流 - 偏置:- 工作温度:0°C ~ 70°C 封装/外壳:40-TQFN 裸露焊盘 供应商设备封装:40-TQFN EP 包装:托盘 安装类型:表面贴装 |
| ADN2872 | 制造商:AD 制造商全称:Analog Devices 功能描述:3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver |
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