参数资料
| 型号： | MAX3296CTI+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 12/28页 |
| 文件大小： | 0K |
| 描述： | IC LASR DRVR 2.5GBPS 5.5V 28TQFN |
| 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： | 1 |
| 电源电压： | 3 V ~ 5.5 V |
| 电流 - 电源： | 52mA |
| 电流 - 调制： | 30mA |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页当前第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
3.0V to 5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers
rent, while the resistor R TC sets the temperature-
PORDLY
increasing portion of the modulation current.
V CC
MAX3286
To determine the appropriate temperature coefficient
from the slope efficiency ( α) of the laser, use the following
10 6 [ ppm / ° C ]
×
α 70 ? α 25
α 25 ( 70 ° C ? 25 ° C )
LV
25k ?
36k ?
28k ?
1.2V
MAX3296
VARIABLE
DELAY
= 0.7s/ μ F C PORDLY
BANDGAP
POR
equation:
Laser tempco =
where α is the slope of the laser output power to the
laser current.
For example, suppose a laser has a slope efficiency
α 25 of 0.021mW/mA at +25°C, which reduces to
0.018mW/mA at +70°C. Using the above equation pro-
R TC =
? 250 ?
Figure 7. Power-On Reset Circuit
2) EN is switched low, then high.
3) EN is switched to high, then low.
Power-On Reset (POR)
Figure 7 shows the POR circuit for the MAX3286/
duces a laser tempco of -3175ppm/°C.
To obtain the desired modulation current and tempco
for the device, the following two equations can be used
to determine the required values of R MOD and R TC :
0 . 21
tempco ( I MOD )
MAX3296 series devices. A POR signal asserts low
when V CC is in the operating range. The voltage operat-
ing range is determined by the LV pin, as shown in
R MOD =
(R TC + 250 ? )52 × tempco
( 0 . 19 ? 48 × t empco )
? 250 ?
Table 2. POR contains an internal delay to reject noise
on V CC during power-on or hot-plugging. The delay can
be extended by adding capacitance to the PORDLY
pin. The POR comparator includes hysteresis to improve
noise rejection. The laser driver is shut down while V CC
is out of the operating range.
Design Procedure
Select Laser
Select a communications-grade laser with a rise time of
260ps or better for 1.25Gbps, or 130ps or better for
2.5Gbps applications. To obtain the MAX3286/
where tempco = -laser tempco.
Figure 8a shows a family of curves derived from these
equations. The straight diagonal lines depict constant
tempcos. The curved lines represent constant modula-
tion currents. If no temperature compensation is
desired, Figure 8b displays a series of curves that
show laser modulation current with respect to R MOD for
different loads.
The following useful equations were used to derive
Figure 8a and the equations at the beginning of this
section. The first assumes R L = 25 ? .
? R + 250 ?
? ? ? 1 + 4 . 0 × 10
+
( T – 25 ° C ) ?
× ?
? [ A ]
MAX3296’s AC specifications, the instantaneous output
voltage at OUT+ must remain above V CC - 1V at all
times. Select a high-efficiency laser that requires low
modulation current and generates low-voltage swing at
OUT+. Laser package inductance can be reduced by
? 1 . 15
I MOD = 51 × ? MOD
? ? ? 3
1 . 06
R TC + 250 ?
?
?
?
? ?
trimming the leads. Typical package leads have induc-
tance of 25nH/in (1nH/mm); this inductance causes a
larger voltage swing across the laser. A compensation fil-
ter network also can be used to reduce ringing, edge
speed, and voltage swing.
Programming the Modulation Current
Resistors at the MODSET and TC pins set the ampli-
tude of the modulation current. The resistor R MOD sets
the temperature-stable portion of the modulation cur-
I MOD ( 70 ° C ) = I MOD ( 25 ° C ) + I MOD ( 25 ° C )
( tempco )( 70 ° C – 25 ° C ) [ A ]
Programming the Bias Current/APC
Three application circuits are described below: com-
mon-cathode laser with photodiode, common-cathode
laser without photodiode, and common-anode laser
12
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| MAX3296EVKIT-LW | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX3296EVKIT-SW | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX3297CUE | 功能描述:激光驱动器 Integrated Circuits (ICs) 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 |
| MAX3297CUE+ | 功能描述:激光驱动器 Integrated Circuits (ICs) 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 |
| MAX3297CUE+T | 功能描述:激光驱动器 Integrated Circuits (ICs) 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 |
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