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| 型号： | MAX3795ETG+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 12/15页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER VCSEL W/MON 24-TQFN |
| 标准包装： | 2,500 |
| 类型： | 激光二极管驱动器 |
| 数据速率： | 4.25Gbps |
| 通道数： | 1 |
| 电源电压： | 2.97 V ~ 3.63 V |
| 电流 - 电源： | 71mA |
| 电流 - 调制： | 15mA |
| 电流 - 偏置： | 15mA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-TQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
1Gbps to 4.25Gbps Multirate VCSEL Driver
with Diagnostic Monitors
current. For appropriate R TC and R MODSET values, see
the Typical Operating Characteristics .
Design Procedure
Select Laser
Select a communications-grade laser with a rise time of
90ps or better for 4.25Gbps applications. Use a high-
efficiency laser that requires low modulation current and
generates a low-voltage swing. Trim the leads to reduce
Programming Modulation-Current Tempco
Compute the required modulation tempco from the
slope efficiency of the laser at T A = +25 ° C and at a
higher temperature. Then select the value of R TC from
the Typical Operating Characteristics . For example,
suppose a laser has a slope efficiency (SE) of
0.021mW/mA at +25 ° C, which reduces to 0.018mW/mA
at +85 ° C. The temperature coefficient is given by the
following:
laser package inductance. The typical package leads
have inductance of 25nH per inch (1nH/mm). This
inductance causes a large voltage swing across the
laser. A compensation filter network can also be used to
reduce ringing, edge speed, and voltage swing.
Laser tempco =
( SE 85 ? SE 25 )
SE 25 × ( 85 ? 25 )
= ? 2380 ppm / ° C
× 10 6
? ? ? 200 + R MODSET ?
I MOD = ? ? ? × 40 ? × ? R ?
? ? ? OUT LOAD ?
Programming Modulation Current
A resistor (R MODSET ) placed between the MODSET pin
and ground controls the modulation current out of the
MAX3795 to the VCSEL. The modulation current is
given by the following:
? ? 1 ? ? ? R OUT ?
+ R
It is important to note that the load impedance of the
VCSEL affects the modulation current being sourced by
the MAX3795. The Modulation Current vs. R MODSET
graph in the Typical Operating Characteristics shows the
current into a 50 ? load. Capacitance at the MODSET pin
should be ≤ 20pF.
Programming Bias Current
From the Typical Operating Characteristics , the value
of R TC , which offsets the tempco of the laser, is 9k ? . If
modulation temperature compensation is not desired,
short TC1 and TC2.
Programming the APC Loop
Program the average optical power by adjusting
R PWRSET . To select the resistance, determine the
desired monitor current to be maintained over tempera-
ture and lifetime. See the Monitor Diode Current vs.
R PWRSET graph in the Typical Operating Characteristics,
and select the value of R PWRSET that corresponds to the
required current.
V CC
The bias current output of the MAX3795 is controlled by
a resistor (R BIASSET ) placed between the BIASSET pin
and ground. In open-loop operation, BIASSET controls
the bias current level of the VCSEL. In closed-loop
operation (APC); the R BIASSET controls the maximum
allowed bias current. The open-loop bias current is
given by the following:
IN+
MAX3795
PACKAGE
1nH
0.5pF
V CC
50 ?
1k ?
I BIAS = ?
? × 34
? 1 . 2 ?
? 200 + R BIASSET ?
The Bias Current vs. R BIASSET graph in the Typical
Operating Characteristics shows the current into a 50 ?
IN-
1nH
0.5pF
V CC
50 ?
15pF
load. Capacitance at the BIASSET pin should be
≤ 20pF.
Figure 4. Simplified Input Structure
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3795EVKIT | 功能描述:激光驱动器 MAX3795 Eval Kit 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 |
| MAX3798ETJ+ | 功能描述:激光驱动器 1.0625-10.32Gbps SFP w/VCSEL 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 |
| MAX3798ETJ+T | 功能描述:激光驱动器 1.0625-10.32Gbps SFP w/VCSEL 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 |
| MAX3799E/D | 功能描述:限幅放大器 1Gbps to 14Gbps SFP+ Multirate Limiting Amplifier and VCSEL Driver RoHS:否 制造商:Micrel 输入电压范围（最大值）:3.6 V 工作电源电压:3.3 V 电源电流:40 mA 工作温度范围:- 40 C to + 85 C 封装 / 箱体:MSOP-10 封装:Tube |
| MAX3799ETJ+ | 功能描述:限幅放大器 1-14Gbps SFP w/VCSEL Driver RoHS:否 制造商:Micrel 输入电压范围（最大值）:3.6 V 工作电源电压:3.3 V 电源电流:40 mA 工作温度范围:- 40 C to + 85 C 封装 / 箱体:MSOP-10 封装:Tube |
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