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参数资料
| 型号： | ADN2873ACPZ-R7 |
| 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： | 31mA |
| 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 |
ADN2873
DATA INPUTS
Data inputs should be ac-coupled (10 nF capacitors are recom-
mended) 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 the common-mode
voltages of the data source and the ADN2873 data input pins.
LASER DIODE INTERFACING
ADN2873 to most TO-can or coax lasers. Uncooled 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 (without
and Figure 25 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 at the laser side while provid-
ing a very high quality matching network at the driver side.
The impedance of the driver side matching network is very flat
in the designed frequency range and enables multirate operation.
A series damping resistor should not be used.
V CC
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 accommo-
dated 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
laser, sufficient for most lasers available today. Higher currents
can be accommodated by changing transmission lines and back-
match 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 ADN2873 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 driving VCSELs or lasers
that have slow fall times. Differential drive can be implemented by
IMODP
ADN2873
IBIAS
L (0.5nH)
R P C
24 ? 100nF
Tx LINE Tx LINE
30 ? 30 ?
V CC
R Z
L
BLM18HG601SN1D
R
24 ?
C
2.2pF
V CC
adding a few extra components. A possible implementation is
shown in Figure 36. The bias and modulation currents that are
programmed into the ADN2873 need to be larger than the bias
and modulation current required at the laser due to the laser ac
coupling interface and because some modulation current flows
in the pull-up resistors, R1 and R2.
In Figure 35 and Figure 36, Resistor RZ is required to achieve
optimum eye quality. The recommended R Z value is approximately
Figure 35. Recommended Interface for ADN2873 AC Coupling
The 30 Ω transmission line used is a compromise between the
drive current required and the total power consumed. Other
500 Ω ~ 800 Ω.
The interface circuit needs a special modification to support
HDTV pathological test patterns. Contact sales at Analog Devices
for HDTV support.
V CC
L1 = 0.5nH
L4 = BLM18HG601SN1D
R1 = 15 ?
C1 = C2 = 100nF
L3 = 4.7nH
TO-CAN/VCSEL
IMODN
ADN2873
20 ? TRANSMISSION LINES R3
C3
SNUBBER
LIGHT
IMODP
IBIAS
R2 = 15 ?
L2 = 0.5nH
V CC
V CC
R Z
L6 = BLM18HG601SN1D
SNUBBER SETTINGS: 40 ? AND 1.5pF, NOT OPTIMIZED, OPTIMIZATION SHOULD
CONSIDER THE PARASITIC OF THE INTERFACE CIRCUITRY.
Figure 36. Recommended Differential Drive Circuit
Rev. 0 | Page 17 of 20
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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 |
| ADN2873ACPZ-RL7 | 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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