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MAX2681 PDF预览

MAX2681

更新时间: 2024-10-27 22:55:23
品牌 Logo 应用领域
美信 - MAXIM /
页数 文件大小 规格书
12页 128K
描述
400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers

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10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 
4 0 0 MHz t o 2 .5 GHz, Lo w -No is e ,  
S iGe Do w n c o n ve rt e r Mix e rs  
01/MAX682  
IF Ou t p u t  
De t a ile d De s c rip t io n  
The IF output frequency range extends from 10MHz to  
500MHz. IFOUT is a high-impedance, open-collector  
The MAX2680/MAX2681/MAX2682 a re 400MHz to  
2.5GHz, silicon-germanium, double-balanced down-  
converter mixers. They are designed to provide opti-  
mum line a rity p e rforma nc e for a s p e c ifie d s up p ly  
current. They consist of a double-balanced Gilbert-cell  
mixer with single-ended RF, LO, and IF port connec-  
tions. An on-chip bias cell provides a low-power shut-  
down feature. Consult the Selector Guide for device  
features and comparison.  
output that requires an external inductor to V  
for  
CC  
proper biasing. For optimum performance, the IF port  
requires an impedance-matching network. The configu-  
ration and values for the matching network is depen-  
d e nt up on the fre q ue nc y a nd d e s ire d outp ut  
impedance. For assistance in choosing components for  
optimal performance, refer to Tables 3 and 4 as well as  
the IF Port Impedance vs. IF Frequency graph in the  
Typical Operating Characteristics.  
Ap p lic a t io n s In fo rm a t io n  
SHDN  
P o w e r-S u p p ly a n d  
Proper attention to voltage supply bypassing is essen-  
tial for high-frequency RF circuit stability. Bypass V  
Byp a s s in g  
Lo c a l-Os c illa t o r (LO) In p u t  
The LO input is a single-ended broadband port with a  
typical input VSWR of better than 2.0:1 from 400MHz to  
2.5GHz. The LO signal is mixed with the RF input sig-  
nal, and the resulting downconverted output appears at  
IFOUT. AC-couple LO with a capacitor. Drive the LO  
p ort with a s ig na l ra ng ing from -10d Bm to 0 (50  
source).  
CC  
with a 10µF capacitor in parallel with a 1000pF capaci-  
tor. Use separate vias to the ground plane for each of  
the bypass capacitors and minimize trace length to  
reduce inductance. Use separate vias to the ground  
plane for each ground pin. Use low-inductance ground  
connections.  
RF In p u t  
The RF input frequency range is 400MHz to 2.5GHz.  
The RF input requires an impedance-matching network  
as well as a DC-blocking capacitor that can be part of  
the matching network. Consult Tables 1 and 2, as well  
as the RF Port Impedance vs. RF Frequency graph in  
the Typical Operating Characteristics for information on  
matching.  
Decouple SHDN with a 1000pF capacitor to ground to  
minimize noise on the internal bias cell. Use a series  
resistor (typically 100) to reduce coupling of high-fre-  
quency signals into the SHDN pin.  
La yo u t Is s u e s  
A well designed PC board is an essential part of an RF  
circuit. For best performance, pay attention to power-  
supply issues as well as to the layout of the RFIN and  
IFOUT impedance-matching network.  
Table 1. RFIN Port Impedance  
FREQUENCY  
PART  
400MHz  
179-j356  
209-j332  
206-j306  
900MHz  
54-j179  
75-j188  
78-j182  
1950MHz  
2450MHz  
33-j73  
MAX2680  
MAX2681  
MAX2682  
32-j94  
34-j108  
34-j106  
33-j86  
29-j86  
Table 2. RF Input Impedance-Matching Component Values  
FREQUENCY  
MAX2680  
MAX2681  
MAX2682  
MATCHING  
COMPONENTS  
400  
MHz  
900  
MHz  
1950  
MHz  
2450  
MHz  
400  
MHz  
900  
1950  
MHz  
2450  
MHz  
400  
MHz  
900  
1950  
MHz  
2450  
MHz  
MHz  
270pF  
18nH  
Open  
MHz  
1.5pF  
270pF  
10nH  
Z1  
Z2  
Z3  
86nH  
270pF  
Open  
270pF 1.5pF  
Short  
68nH  
1.5pF  
Short  
68nH  
Short  
Short  
22nH  
Open  
270pF 270pF 270pF  
1.8nH 1.8nH 0.5pF  
270pF 270pF 270pF  
1.8nH 2.2nH 0.5pF  
270pF 270pF  
2.2nH 1.2nH  
Note: Z1, Z2, and Z3 are found in the Typical Operating Circuit.  
_______________________________________________________________________________________  
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