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MAX2681 PDF预览

MAX2681

更新时间: 2023-12-20 18:44:15
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
12页 2151K
描述
400MHz至2.5GHz、低噪声、SiGe下变频混频器

MAX2681 数据手册

 浏览型号MAX2681的Datasheet PDF文件第6页浏览型号MAX2681的Datasheet PDF文件第7页浏览型号MAX2681的Datasheet PDF文件第8页浏览型号MAX2681的Datasheet PDF文件第9页浏览型号MAX2681的Datasheet PDF文件第11页浏览型号MAX2681的Datasheet PDF文件第12页 
MAX2680/MAX2681/  
MAX2682  
400MHz to 2.5GHz, Low-Noise,  
SiGe Downconverter Mixers  
Power-Supply Layout  
Table 3. IFOUT Port Impedance  
To minimize coupling between different sections of the IC,  
the ideal power-supply layout is a star configuration with  
FREQUENCY  
PART  
45MHz  
960-j372  
934-j373  
670-j216  
70MHz  
803-j785  
746-j526  
578-j299  
240MHz  
186-j397  
161-j375  
175-j296  
a large decoupling capacitor at a central V  
node. The  
CC  
MAX2680  
MAX2681  
MAX2682  
V
traces branch out from this central node, each going  
CC  
to a separate V  
node on the PC board. At the end of  
CC  
each trace is a bypass capacitor that has low ESR at the  
RF frequency of operation. This arrangement provides  
local decoupling at the V  
pin. At high frequencies, any  
CC  
signal leaking out of one supply pin sees a relatively high  
impedance (formed by the V trace inductance) to the  
Table 4. IF Output Impedance-Matching  
Components  
CC  
central V  
node, and an even higher impedance to any  
CC  
other supply pin, as well as a low impedance to ground  
through the bypass capacitor.  
FREQUENCY  
70MHz  
330nH  
MATCHING  
COMPONENT  
45MHz  
390nH  
39pF  
240MHz  
82nH  
3pF  
Impedance-Matching Network Layout  
L1  
C2  
R1  
The RFIN and IFOUT impedance-matching networks  
are very sensitive to layout-related parasitics. To mini-  
mize parasitic inductance, keep all traces short and  
place components as close as possible to the chip. To  
minimize parasitic capacitance, use cutouts in the ground  
plane (and any other plane) below the matching network  
components. However, avoid cutouts that are larger than  
necessary since they act as aperture antennas.  
15pF  
250Ω  
Open  
Open  
Typical Operating Circuit  
C1  
LO  
1
2
6
5
4
SHUTDOWN  
CONTROL  
C3  
SHDN  
LO  
INPUT  
MAX2680  
MAX2681  
MAX2682  
V
CC  
V
CC  
GND  
+2.7V TO +5.5V  
C4  
C5  
10µF  
1000pF  
R1  
L1  
Z
Z
2
1
RF  
IF  
OUTPUT  
3
RFIN  
IFOUT  
INPUT  
C2  
Z
3
THE VALUES OF MATCHING COMPONENTS C2, L1, R1, Z1, Z2, AND Z3 DEPEND ON THE IF AND RF FREQUENCY AND DOWNCONVERTER. SEE TABLES 2 AND 4.  
Maxim Integrated  
10  
www.maximintegrated.com  

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