- 您现在的位置：买卖IC网 > PDF目录20062 > SY88212LMG (Micrel Inc)IC LASER DRVR 2.5GBPS 3.6V 24MLF PDF资料下载
参数资料
| 型号： | SY88212LMG |
| 厂商： | Micrel Inc |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC LASER DRVR 2.5GBPS 3.6V 24MLF |
| 标准包装： | 75 |
| 类型： | 激光二极管驱动器（光纤） |
| 数据速率： | 2.5Gbps |
| 通道数： | 1 |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 55mA |
| 电流 - 调制： | 85mA |
| 电流 - 偏置： | 70mA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-VFQFN 裸露焊盘，24-MLF? |
| 供应商设备封装： | 24-MLF?（4x4） |
| 包装： | 托盘 |
| 安装类型： | 表面贴装 |
| 产品目录页面： | 1089 (CN2011-ZH PDF) |
| 其它名称： | 576-3062 |
Micrel, Inc.
Detailed Functional Description
The SY88212L laser driver is comprised from a fast
modulator, a fast bias circuit, and a digital APC loop that
allows for fast laser turn-ON time. The driver features a
power monitoring function.
BIAS and Modulation Setting
Bias and modulation currents are set by installing
resistors from APCSET (pin 24) to ground and from
MODSET (pin 23) to ground respectively or by applying
a negative current at those pins. I MD variation versus
R APCSET resistor, I BIAS variation versus R BIASMAX resistor,
and I MOD variation versus R MODSET resistor are shown on
page 8.
BIASMAX
A resistor between BIASMAX pin and ground sets the
maximum bias the driver can sink. At normal operation,
the bias current tracks the laser optical power through
the laser monitoring photodiode and the APC loop to
compensate for any power deviation from the nominal
value set at the start of operation using APCSET. If for
any failure (laser or photodiode degradation, open
feedback circuit etc…) the APC loop keeps increasing
the bias current trying to compensate for the low power
indication, the bias current will stop increasing when it
reaches BIASMAX value and continues to operate at
that maximum value and TXFAULT asserted high.
BIASMAX also controls the bias current when the circuit
is operating in the open loop mode.
SY88212L
APC Loop Function
At start up, with the driver enabled, the laser turns ON
within a few microseconds and its back facet monitoring
photodiode starts to generate a photocurrent
proportional to the optical power. The photocurrent is fed
back to the MD pin on the driver where it’s converted to
a voltage. The conversion voltage is compared to
APCSET on the driver. At equilibrium, the feedback
voltage equals the APCSET voltage and the laser optical
power reaches its nominal value. If the laser power
deviates from its nominal value, the APC loop brings it
back to its nominal setting.
APC Loop Failure
TXFAULT is asserted High if the bias current reaches
BIASMAX or if the APC loop counter reaches its
minimum or its maximum counts.
Interfacing the Driver with the Laser Diode
As shown in the “Typical Application” drawing, MOD+
pin is connected to the laser cathode through a 10 ?
resistor and MOD- pin is connected to V CC with a 15 ?
resistor equivalent to 10 ? (damping resistor) in series
with the laser (equivalent resistor of 5 ? ). The laser can
be driven differentially by connecting MOD- to the anode
of the laser through 15 ? (15 ? pull-up removed) and
isolating the anode of the laser from VCC with an
inductor.
For better results at 2.5Gbps, the driver can be AC-
coupled to the laser as shown in Figure 1.
Figure 1. Laser AC-Coupled to the Driver
Typical Application
March 2008
7
M9999-030708-A
hbwhelp@micrel.com or (408) 955-1690
相关PDF资料 |
PDF描述 |
|---|---|
| VI-BW4-CV-S | CONVERTER MOD DC/DC 48V 150W |
| ESC20DTEF | CONN EDGECARD 40POS .100 EYELET |
| GRM1885C1H1R5CZ01D | CAP CER 1.5PF 50V NP0 0603 |
| VI-26K-EV-F3 | CONVERTER MOD DC/DC 40V 150W |
| PW173KB4803F01 | PS EXT 32.2W 48V @ 0.67A E-STAR |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SY88212LMG TR | 功能描述:激光驱动器 3.3V, 2.5 Gbps LDD with APC and monitor function - 24 pin MLF Green RoHS:否 制造商:Micrel 数据速率:4.25 Gbps 工作电源电压:3 V to 3.6 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:QFN-16 封装:Tube |
| SY88212MGTR | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:3.3V, 2.5Gbps Laser Diode Driver |
| SY88216L | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:3.3V, 2.5Gbps Burst Mode Laser Driver |
| SY88216L_10 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:3.3V, 2.5Gbps Burst Mode Laser Driver |
| SY88216LMG | 功能描述:激光驱动器 3.3V, 2.5GBps Burst Mode Laser Diode Driver RoHS:否 制造商:Micrel 数据速率:4.25 Gbps 工作电源电压:3 V to 3.6 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:QFN-16 封装:Tube |
发布紧急采购，3分钟左右您将得到回复。