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| 型号： | ADN2872ACPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC LASR DVR 3.3GBPS 3.3V 24LFCSP |
| 标准包装： | 1 |
| 类型： | 激光二极管驱动器 |
| 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： | 标准包装 |
| 安装类型： | 表面贴装 |
| 产品目录页面： | 788 (CN2011-ZH PDF) |
| 其它名称： | ADN2872ACPZ-RLDKR |
ADN2872
DATA INPUTS
Data inputs should be ac-coupled (10 nF capacitors are
recommended) and are terminated via a 100 Ω internal resistor
between the DATAP and DATAN pins. A high impedance
circuit sets the common-mode voltage and is designed to allow
maximum input voltage headroom over temperature. It is
necessary to use ac coupling to eliminate the need for matching
between common-mode voltages.
LASER DIODE INTERFACING
The schematic in Figure 32 describes the recommended circuit
for interfacing the ADN2872 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
section for multirate performance examples. Coax lasers have
special characteristics that make them difficult to interface to.
They tend to have higher inductance, and their impedance is
not well controlled. The circuit in Figure 32 operates by delibe-
rately 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 multirate 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.
Take care 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 millimeter). 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
laser, sufficient for most lasers available today. Higher currents
can be accommodated by changing transmission lines and
backmatch values. 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 on transmission lines and backmatch values.
The ADN2872 also supports differential drive schemes. These
L (0.5nH)
R P C1
24 ? 100nF
V CC
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
R Z
IMODP
ADN2872
IBIAS
CCBIAS
Tx LINE Tx LINE
30 ? 30 ?
V CC
L
BLM18HG601SN1D
R
24 ?
C
2.2pF
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.
Figure 32. Recommended Interface for ADN2872 AC Coupling
V CC
L1 = 0.5nH
L4 = BLM18HG601SN1D
R1 = 15 ?
C1 = C2 = 100nF
L3 = 4.7nH
TO-CAN/VCSEL
IMODN
ADN2872
20 ? TRANMISSION LINES
R3
C3
SNUBBER
LIGHT
IMODP
CCBIAS IBIAS
R2 = 15 ?
(12 ? TO 24 ? )
L2 = 0.5nH
V CC
V CC
R Z
L5 = 4.7nH
L6 = BLM18HG601SN1D
SNUBBER SETTINGS: 40 ? AND 1.5pF, NOT OPTIMIZED, OPTIMIZATION SHOULD
CONSIDER THE PARASITIC OF THE INTERFACE CIRCUITRY.
Figure 33. Recommended Differential Drive Circuit
Rev. 0 | Page 15 of 20
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| ADN2873 | 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 |
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| ADN2873ACPZ-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 |
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