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参数资料
| 型号： | MAX3869EHJ+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/15页 |
| 文件大小： | 0K |
| 描述： | IC LASER DRIVR 2CHAN 5.5V 32TQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 激光二极管驱动器（光纤） |
| 数据速率： | 2.5Gbps |
| 通道数： | 2 |
| 电源电压： | 3.14 V ~ 5.5 V |
| 电流 - 电源： | 64mA |
| 电流 - 调制： | 60mA |
| 电流 - 偏置： | 100mA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-TQFP 裸露焊盘 |
| 供应商设备封装： | 32-TQFP-EP（5x5） |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Current Monitors and APC
Pin Description (continued)
PIN
20
22
23
24
25
26
27
28
29
30
31
32
NAME
OUT-
GND4
GND3
MD
V CC3
CAPC
GND2
N.C.
APCSET
MODSET
BIASMAX
V CC2
FUNCTION
Negative Modulation-Current Output. I MOD flows through this pad when input data is low.
Ground for Output Circuitry
Ground for APC
Monitor Diode Input. Connect this pad to a monitor photodiode anode. A capacitor to ground
is required to filter high-speed AC monitor photocurrent.
Power Supply for APC
A capacitor connected from this pad to ground controls the dominant pole of the APC feed-
back loop (C APC = 0.1μF).
Ground for Internal Reference
No Connection. Leave unconnected.
A resistor connected from this pad to ground sets the desired average optical power.
Connect 100k ? from this pad to ground if APC is not used.
A resistor connected from this pad to ground sets the desired modulation current.
A resistor connected from this pad to ground sets the maximum bias current. The APC
function can subtract from this maximum value, but cannot add to it.
Power Supply for Internal Reference
_______________Detailed Description
The MAX3869 laser driver consists of two main parts: a
high-speed modulation driver and a laser-biasing block
with automatic power control (APC). The circuit design
is optimized for both high-speed and low-voltage
(+3.3V) operation. To minimize the pattern-dependent
jitter of the input signal at speeds as high as 2.5Gbps,
the device accepts a differential PECL clock signal for
data retiming. When LATCH is high, the input data is
synchronized by the clock signal. When LATCH is low,
the input data is directly applied to the output stage.
The output stage is composed of a high-speed differential
pair and a programmable modulation current source.
Since the modulation output drives a maximum current
of 60mA into the laser with an edge speed of 100ps,
large transient voltage spikes can be generated (due to
the parasitic inductance). These transients and the
laser forward voltage leave insufficient headroom for
the proper operation of the laser driver if the modulation
output is DC-coupled to the laser diode. To solve this
problem, the MAX3869’s modulation output is designed
to be AC-coupled to the cathode of a laser diode. An
external pull-up inductor is necessary to DC-bias the
modulation output at V CC . Such a configuration isolates
laser forward voltage from the output circuitry and
allows the output at OUT+ to swing above and below
the supply voltage V CC . A simplified functional diagram
is shown in Figure 4.
The MAX3869 modulation output is optimized for driv-
ing a 25 ? load; the minimum required voltage at OUT+
is 2.0V. Modulation current swings of 80mA are possi-
ble, but due to minimum power-supply and jitter
requirements at 2.5Gbps, the specified maximum mod-
ulation current is limited to 60mA. To interface with the
laser diode, a damping resistor (R D ) is required for
impedance matching. An RC shunt network may also
be necessary to compensate for the laser-diode para-
sitic inductance, thereby improving the optical output
aberrations and duty-cycle distortion.
At the data rate of 2.5Gbps, any capacitive load at the
cathode of a laser diode will degrade the optical output
performance. Since the BIAS output is directly connect-
ed to the laser cathode, minimize the parasitic capaci-
tance associated with this pin by using an inductor to
isolate the BIAS pin from the laser cathode.
Automatic Power Control
To maintain constant average optical power, the
MAX3869 incorporates an APC loop to compensate for
the changes in laser threshold current over temperature
and lifetime. A back-facet photodiode mounted in the
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3869ETJ+ | 功能描述:激光驱动器 3.3V 2.5Gbps SDH/ SONET Laser 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 |
| MAX3869ETJ+D | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX3869ETJ+T | 功能描述:激光驱动器 3.3V 2.5Gbps SDH/ SONET Laser 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 |
| MAX3869EVKIT | 功能描述:激光驱动器 Evaluation Kit for the MAX3869 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 |
| MAX3872AETJ+ | 功能描述:计时器和支持产品 Multirate Clock and Data Recovery with Limiting Amplifier RoHS:否 制造商:Micrel 类型:Standard 封装 / 箱体:SOT-23 内部定时器数量:1 电源电压-最大:18 V 电源电压-最小:2.7 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Reel |
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