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MAX3747EUB-T

更新时间： 2024-02-25 23:19:27
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美信 - MAXIM 放大器
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MAX3747EUB-T 数据手册

 浏览型号MAX3747EUB-T的Datasheet PDF文件第4页浏览型号MAX3747EUB-T的Datasheet PDF文件第5页浏览型号MAX3747EUB-T的Datasheet PDF文件第6页浏览型号MAX3747EUB-T的Datasheet PDF文件第7页浏览型号MAX3747EUB-T的Datasheet PDF文件第8页浏览型号MAX3747EUB-T的Datasheet PDF文件第10页 
155Mbps to 3.2Gbps, Low-Power SFP  
Limiting Amplifiers  
Loss-of-Signal Indicator  
Applications Information  
Program the LOS Assert Threshold  
Program the LOS assert threshold according to Figure  
5. The combination of R1 and R2 should be greater  
The MAX3747/MAX3747A are equipped with LOS cir-  
cuitry that indicates when the input signal is below a pro-  
grammable threshold, set by a voltage on the TH pin  
(see the Typical Operating Characteristics). The voltage  
on the TH pin is set by two resistors, one connecting  
than or equal to 5kΩ, see the Assert/Deassert vs. V  
TH  
graph in the Typical Operating Characteristics.  
from the TH pin to V  
and the other connecting from TH  
(Figure 5). An RMS power detector compares  
CC  
to V  
REF  
Select the Coupling Capacitor  
When AC-coupling is desired, coupling capacitors C  
the input signal amplitude with this threshold and feeds  
the signal-detect information to the LOS output, which  
is open collector. To prevent LOS chatter in the region of  
the programmed threshold, approximately 2dB of hys-  
teresis is built into the LOS assert/deassert function.  
Once asserted, LOS is not deasserted until the input  
amplitude rises to the required level. Figure 6 shows the  
LOS output circuit.  
IN  
and C  
should be selected to minimize the receiv-  
OUT  
er’s deterministic jitter. Jitter is decreased as the input  
low-frequency cutoff (f ) is decreased:  
IN  
f
IN  
= 1 / [2π(50)(C )]  
IN  
For all applications, the recommended value for C and  
IN  
C
OUT  
is 0.1µF, which provides f equal to 32kHz. Refer  
IN  
to Application Note HFAN-1.1: Choosing AC-Coupling  
Capacitors on the Maxim website (www.maxim-ic.com).  
V
CC  
EMI Performance  
The MAX3747/MAX3747A have been designed for bet-  
ter EMI performance. To help reduce EMI, special care  
has been taken to produce symmetrical signal outputs.  
R1  
R2  
TH  
Pin Configuration  
V
REF  
TOP VIEW  
DISABLE  
IN+  
1
2
3
4
5
10  
9
V
CC  
V
= (R1 x (V - V )) / (R2 + R1)  
REF CC  
TH  
V
IS V REFERENCED  
TH  
CC  
OUT+  
OUT-  
LOS  
R1 + R2 ≥ 5kΩ  
MAX3747  
MAX3747A  
IN-  
8
Figure 5. MAX3747/MAX3747A LOS Threshold Circuit  
V
7
REF  
TH  
V
CC  
6
GND  
µMAX  
Chip Information  
LOS  
TRANSISTOR COUNT: 443  
PROCESS: SiGe Bipolar  
ESD  
STRUCTURE  
Figure 6. MAX3747/MAX3747A LOS Output Circuit  
_______________________________________________________________________________________  
9
1...678910

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