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参数资料
| 型号： | ADN2871ACPZ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/20页 |
| 文件大小： | 0K |
| 描述： | IC LASER DRIVER 4.25GBPS 24LFCSP |
| 标准包装： | 1,500 |
| 类型： | 激光二极管驱动器（光纤） |
| 数据速率： | 4.25Gbps |
| 通道数： | 1 |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 32mA |
| 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 |
ADN2871
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
ADN2871 to most TO Can or coax lasers. DFB and FP 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 Multirate
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 35 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 in comparison to 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 the total power consumed. Other
transmission line values can be used, with some modification of
the component values. In Figure 35, the R and C snubber
values, 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
can supply up to 56 mA of modulation current to the laser,
sufficient for most lasers available today. Higher currents can be
accommodated by changing transmission lines and backmatch
values; contact Sales for recommendations. 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. The ADN2871 single-ended application shown
in Figure 35 is recommended for use up to 2.7 Gbps. From 2.7
Gbps to 4.25 Gbps, a differential drive is recommended when
L (0.5nH)
R P C
24 ? 100nF
V CC
driving VCSELs or lasers that have slow fall times. Differential
drive can be implemented by adding a few extra components. A
IMODP
ADN2871
IBIAS
Tx LINE
30 ?
V CC
R Z
L
Tx LINE
30 ?
R
24 ?
C
2.2pF
possible implementation is shown in Figure 36. The bias and
modulation currents that are programmed into the ADN2871
need to be larger that the bias and modulation current required
at the laser due to the laser ac coupling interface and because
BLMI8HG60ISN1D
Figure 35. Recommended Interface for ADN2871 AC Coupling
L1 = 0.5nH
V CC
some modulation current flows in pull-up Resistors R1 and R2.
optimum eye quality. The recommended R Z value is
approximately 200 Ω ~ 500 Ω.
L4 = BLM18HG601SN1
R1 = 15 ?
C1 = C2 = 100nF
L3 = 4.7nH
TOCAN/VCSEL
IMODN
ADN2871
20 ? TRANMISSION LINES
R3
C3
SNUBBER
LIGHT
IMODP
IBIAS
R2 = 15 ?
V CC
L2 = 0.5nH
V CC
R Z
L6 = BLM18HG601SN1D
SNUBBER SETTINGS: 40 ? AND 1.5pF, NOT OPTIMIZED,
OPTIMIZATION SHOULD CONSIDER PARASITIC.
Figure 36. Recommended Differential Drive Circuit
Rev. A | Page 17 of 20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ADN2872ACPZ | 功能描述:IC LSR DVR 3.3GBPS 3.3V 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 |
| ADN2872ACPZ-R7 | 功能描述:IC LASR DVR 3.3GBPS 3.3V 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 |
| ADN2872ACPZ-RL | 功能描述:IC LASR DVR 3.3GBPS 3.3V 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 |
| 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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