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MAX2685_00

更新时间： 2022-11-17 18:56:04
品牌 Logo 应用领域
美信 - MAXIM 放大器
页数 文件大小 规格书
10页 174K
描述
Low-Cost, 900MHz, Low-Noise Amplifier and Downconverter Mixer

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中文翻译

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MAX2685_00 数据手册

 浏览型号MAX2685_00的Datasheet PDF文件第4页浏览型号MAX2685_00的Datasheet PDF文件第5页浏览型号MAX2685_00的Datasheet PDF文件第6页浏览型号MAX2685_00的Datasheet PDF文件第8页浏览型号MAX2685_00的Datasheet PDF文件第9页浏览型号MAX2685_00的Datasheet PDF文件第10页 
Low-Cost, 900MHz, Low-Noise Amplifier  
and Downconverter Mixer  
LNA Bypass Switch  
Detailed Description  
and Gain Control  
The MAX2685 consists of five major components: a  
When a large input signal is present, enable the LNA  
bypass function to increase linearity and reduce supply  
current. Set GAIN low to enable the LNA bypass func-  
tion.  
low-noise amplifier (LNA), an LNA bypass switch, a  
downconverter mixer, a local-oscillator (LO) buffer, and  
a power-management block.  
Low-Noise Amplifier (LNA)  
The LNA is a wideband, single-ended cascode amplifi-  
er that operates over a wide range of frequencies. The  
input of the LNA (LNAIN) requires an appropriate  
matching network and a DC-blocking capacitor. The  
typical operating circuit shown in Figure 1 is optimized  
for frequencies around 880MHz, requiring only a 0.1µF  
capacitor in series with a 12nH inductor. See Table 1  
for the LNA “S” parameters for matching to other fre-  
quencies.  
Receive Mixer  
The downconverter mixer is a wideband, single-bal-  
anced design with a low noise figure and high linearity.  
The RF signal at the MIXIN port is mixed with the signal  
at the LO port, and is downconverted to an IF frequen-  
cy at the differential IF port.  
RF Input  
The MIXIN input requires a simple external matching  
network and a series DC-blocking capacitor. See  
Figure 1 for a matching network example, optimized for  
880MHz operation. Table 2 lists mixer “S” parameters  
for matching to other frequencies.  
The output of the LNA (LNAOUT) is internally biased to  
V
. It is internally matched to 50 and incorporates  
CC  
an internal DC-blocking capacitor.  
Table 1. LNA Typical S-Parameters (V = +3V, T = +25°C)  
CC  
A
S11  
PHASE  
(degrees)  
S21  
PHASE  
(degrees)  
S12  
PHASE  
(degrees)  
S22  
PHASE  
(degrees)  
FREQUENCY  
(MHz)  
S11  
MAG  
S21  
MAG  
S12  
MAG  
S22  
MAG  
|
|
|
|
|
|
|
|
High-Gain Mode (GAIN = V  
)
CC  
800  
840  
880  
920  
960  
1000  
0.761  
0.753  
0.747  
0.733  
0.719  
0.693  
-64.5  
-68.6  
-73.2  
-78.0  
-82.8  
-87.5  
4.98  
5.06  
5.07  
4.91  
4.68  
4.40  
177.9  
167.2  
156.6  
146.6  
137.7  
130.3  
0.018  
0.022  
0.026  
0.030  
0.035  
0.039  
-163.7  
-167.1  
-171.3  
-175.7  
178.0  
171.0  
0.376  
0.264  
0.172  
0.149  
0.200  
0.263  
-107.3  
-107.0  
-94.6  
-62.9  
-42.4  
-38.8  
Low-Gain Mode (GAIN = GND)  
800  
840  
880  
920  
960  
1000  
0.625  
0.621  
0.619  
0.611  
0.608  
0.607  
-45.6  
-48.1  
-50.9  
-53.3  
-55.5  
-57.5  
0.188  
0.195  
0.199  
0.200  
0.200  
0.200  
73.0  
65.5  
58.1  
51.6  
46.1  
41.2  
0.191  
0.198  
0.201  
0.202  
0.201  
0.200  
71.9  
64.2  
56.7  
50.3  
44.7  
40.0  
0.483  
0.423  
0.370  
0.337  
0.322  
0.317  
-91.3  
-91.3  
-89.9  
-86.1  
-80.9  
-76.7  
_______________________________________________________________________________________  
7
1...45678910

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