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MAX3869EHJ+T PDF预览

MAX3869EHJ+T

更新时间: 2024-10-28 19:58:35
品牌 Logo 应用领域
美信 - MAXIM 接口集成电路
页数 文件大小 规格书
15页 672K
描述
Interface Circuit, PQFP32, 5 X 5 MM, 1 MM HEIGHT, ROHS COMPLIANT, MS-026AAA-HD, TQFP-32

MAX3869EHJ+T 技术参数

是否无铅: 不含铅是否Rohs认证: 符合
生命周期:Active零件包装代码:QFP
包装说明:HTFQFP, TQFP32,.28SQ针数:32
Reach Compliance Code:compliantECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.11
接口集成电路类型:INTERFACE CIRCUITJESD-30 代码:S-PQFP-G32
JESD-609代码:e3长度:5 mm
湿度敏感等级:1功能数量:1
端子数量:32最高工作温度:85 °C
最低工作温度:-40 °C封装主体材料:PLASTIC/EPOXY
封装代码:HTFQFP封装等效代码:TQFP32,.28SQ
封装形状:SQUARE封装形式:FLATPACK, HEAT SINK/SLUG, THIN PROFILE, FINE PITCH
峰值回流温度(摄氏度):260电源:3.3/5 V
认证状态:Not Qualified座面最大高度:1.2 mm
子类别:Display Drivers最大供电电压:5.5 V
最小供电电压:3.14 V标称供电电压:3.3 V
表面贴装:YES温度等级:INDUSTRIAL
端子面层:Matte Tin (Sn)端子形式:GULL WING
端子节距:0.5 mm端子位置:QUAD
处于峰值回流温度下的最长时间:NOT SPECIFIED宽度:5 mm
Base Number Matches:1

MAX3869EHJ+T 数据手册

 浏览型号MAX3869EHJ+T的Datasheet PDF文件第6页浏览型号MAX3869EHJ+T的Datasheet PDF文件第7页浏览型号MAX3869EHJ+T的Datasheet PDF文件第8页浏览型号MAX3869EHJ+T的Datasheet PDF文件第10页浏览型号MAX3869EHJ+T的Datasheet PDF文件第11页浏览型号MAX3869EHJ+T的Datasheet PDF文件第12页 
+3.3V, 2.5Gbps SDH/SONET Laser Driver  
with Current Monitors and APC  
Optional Data Input Latch  
To minimize input data pattern-dependent jitter, the dif-  
ferential clock signal should be connected to the data  
input latch, which is selected by an external LATCH  
control. If LATCH is high, the input data is retimed by  
the rising edge of CLK+. If LATCH is low, the input data  
is directly connected to the output stage. When this  
Programming the Modulation Current  
For a given laser power P , slope efficiency (η), and  
AVG  
extinction ration (r , the modulation current can be cal-  
e)  
culated using Table 1. See the I  
vs. R  
graph  
MOD  
MODSET  
in the Typical Operating Characteristics and select the  
value of R  
that corresponds to the required cur-  
MODSET  
rent at +25°C.  
latch function is not used, connect CLK+ to V  
leave CLK- unconnected.  
and  
CC  
Programming the Bias Current  
When using the MAX3869 in open-loop operation, the  
Enable Control  
The MAX3869 incorporates a laser driver enable func-  
tion. When ENABLE is low, both the bias and modulation  
currents are off. The typical laser enable time is 250ns,  
and the typical disable time is 25ns.  
bias current is determined by the R  
resistor. To  
BIASMAX  
select this resistor, determine the required bias current  
at +25°C. See the I vs. R graph in the  
BIASMAX  
BIASMAX  
Typical Operating Characteristics and select the value  
of R that corresponds to the required current at  
BIASMAX  
+25°C.  
When using the MAX3869 in closed-loop operation, the  
resistor sets the maximum bias current avail-  
Current Monitors  
The MAX3869 features bias- and modulation-current  
monitor outputs. The BIASMON output sinks a current  
R
BIASMAX  
able to the laser diode over temperature and life. The  
APC loop can subtract from this maximum value but  
equal to 1/37 of the laser bias current (I  
/ 37). The  
BIAS  
MODMON output sinks a current equal to 1/29 of the  
laser modulation current (I / 29). BIASMON and  
cannot add to it. See the I  
vs. R  
graph  
BIASMAX  
BIASMAX  
MOD  
in the Typical Operating Characteristics and select the  
value of R that corresponds to the end-of-life  
MODMON should be connected through a pull-up resis-  
tor to V . Choose a pull-up resistor value that ensures a  
BIASMAX  
CC  
bias current at +85°C.  
voltage at BIASMON greater than V  
age at MODMON greater than V  
- 1.6V and a volt-  
CC  
- 1.0V.  
CC  
Programming the APC Loop  
When the MAX3869’s APC feature is used, program the  
average optical power by adjusting the APCSET resistor.  
To select this resistor, determine the desired monitor cur-  
rent to be maintained over temperature and life. See the  
Slow-Start  
For laser safety reasons, the MAX3869 incorporates a  
slow-start circuit that provides a delay of 250ns for  
enabling a laser diode.  
I
vs. R  
graph in the Typical Operating  
MD  
APCSET  
Characteristics and select the value of R  
responds to the required current.  
that cor-  
APCSET  
APC Failure Monitor  
The MAX3869 provides an APC failure monitor  
(TTL/CMOS) to indicate an APC loop tracking failure.  
FAIL is set low when the APC loop can no longer adjust  
the bias current to maintain the desired monitor current.  
Interfacing with Laser Diodes  
To minimize optical output aberrations caused by signal  
reflections at the electrical interface to the laser diode, a  
series damping resistor (R ) is required (Figure 4).  
D
Short-Circuit Protection  
The MAX3869 provides short-circuit protection for the  
modulation, bias, and monitor current sources. If either  
BIASMAX, MODSET, or APCSET is shorted to ground,  
the bias and modulation output will be turned off.  
Additionally, the MAX3869 outputs are optimized for a  
25load. Therefore, the series combination of R and  
D
R
(where R represents the laser-diode resistance)  
L
L
Table 1. Optical Power Definition  
Design Procedure  
PARAMETER  
SYMBOL  
RELATION  
When designing a laser transmitter, the optical output is  
usually expressed in terms of average power and extinc-  
tion ratio. Table 1 gives the relationships that are helpful  
in converting between the optical average power and the  
modulation current. These relationships are valid if the  
mark density and duty cycle of the optical waveform are  
50%.  
Average Power  
P
P
AVG  
= (P + P ) / 2  
AVG  
0
1
Extinction Ratio  
r
e
r = P / P  
e 1 0  
Optical Power High  
Optical Power Low  
Optical Amplitude  
P
1
P
0
P = 2PAVG · r / (r + 1)  
1
e
e
P = 2P  
0
/ (r + 1)  
AVG  
e
Pp-p  
Pp-p = 2P  
(r - 1) / (r + 1)  
AVG e e  
Laser Slope  
Efficiency  
η
η = Pp-p / I  
MOD  
Modulation Current  
I
I
= Pp-p / η  
MOD  
MOD  
_______________________________________________________________________________________  
9

MAX3869EHJ+T 替代型号

型号 品牌 替代类型 描述 数据表
MAX3869EHJ+ MAXIM

完全替代

Interface Circuit, PQFP32, 5 X 5 MM, 1 MM HEIGHT, ROHS COMPLIANT, MS-026AAA-HD, TQFP-32
MAX3869EGJ-T MAXIM

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Interface Circuit, 5 X 5 MM, 0.90 MM HEIGHT, MO-220, QFN-32

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