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MAX2620 PDF预览

MAX2620

更新时间: 2024-01-13 04:09:37
品牌 Logo 应用领域
美信 - MAXIM 振荡器
页数 文件大小 规格书
12页 107K
描述
10MHz to 1050MHz Integrated RF Oscillator with Buffered Outputs

MAX2620 技术参数

是否无铅: 含铅是否Rohs认证: 不符合
生命周期:Active零件包装代码:SOIC
包装说明:TSSOP,针数:8
Reach Compliance Code:unknown风险等级:5.9
JESD-30 代码:S-PDSO-G8JESD-609代码:e0
长度:3 mm湿度敏感等级:1
功能数量:1端子数量:8
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:TSSOP
封装形状:SQUARE封装形式:SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度(摄氏度):240认证状态:COMMERCIAL
座面最大高度:1.1 mm标称供电电压:3 V
表面贴装:YES技术:BIPOLAR
电信集成电路类型:RF AND BASEBAND CIRCUIT温度等级:INDUSTRIAL
端子面层:TIN LEAD端子形式:GULL WING
端子节距:0.65 mm端子位置:DUAL
处于峰值回流温度下的最长时间:20宽度:3 mm

MAX2620 数据手册

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1 0 MHz t o 1 0 5 0 MHz In t e g ra t e d  
RF Os c illa t o r w it h Bu ffe re d Ou t p u t s  
MAX620  
R , the negative real impedance, is set by C3 and C4  
n
and is approximately:  
V
CC  
V
CC  
[Equation 2]  
0.01µF  
1
1
R
= g  
m
n
10Ω  
0.01µF  
2πfC3 2πfC4  
where g = 0.018mS.  
m
27pF  
10µH  
Using the circuit model of Figure 5, the following exam-  
ple describes the design of an oscillator centered at  
900MHz.  
0.01µF  
1
2
8
7
VCC1  
TANK  
OUT  
OUT  
OUT  
Choose: L1 = 5nH ±10%  
Q = 140  
V
CC  
30pF  
VCC2  
Calculate R = Q x 2π x f x L1  
p
0.01µF  
0.01µF  
MAX2620  
FDBK  
3
4
6
5
Using Equation 1, solve for varactor capacitance (C ).  
D1  
120pF  
120pF  
GND  
OUT  
C
is the capacitance of the varactor when the volt-  
D1  
age applied to the varactor is approximately at half-  
supply (the center of the varactors capacitance range).  
Assume the following values:  
SHDN  
51Ω  
C
= 2.7pF, C17 = 1.5pF, C6 = 1.5pF, C5 = 1.5pF,  
STRAY  
0.01µF  
C3 = 2.7pF, and C4 = 1pF.  
The value of C was based on approximate perfor-  
SHDN  
STRAY  
mance of the MAX2620 EV kit. Values of C3 and C4 are  
V
CC  
chosen to minimize R (Equation 2) while not loading  
n
X = STATEK AT-3004 10MHz  
FUNDAMENTAL MODE CRYSTAL SURFACE MOUNT  
= 20pF  
the resonant circuit with excessive capacitance.  
C
LOAD  
The varactors capacitance range should allow for the  
desired tuning range. Across the tuning frequency  
Figure 4. 10MHz Crystal Oscillator  
range, ensure that R < 1/2 R .  
p
n
The MAX2620s oscillator is optimized for low-phase-  
noise operation. Achieving lowest phase-noise charac-  
te ris tic s re q uire s the us e of hig h-Q (q ua lity fa c tor)  
components such as ceramic transmission-line type  
resonators or high-Q inductors. Also, keep C5 and C17  
Ex a m p le Ca lc u la t io n  
According to the electrical model shown in Figure 5, the  
re s ona nc e fre q ue nc y c a n b e c a lc ula te d a s :  
[Equation 1]  
1
f
=
O
C
+ C  
C + C  
03 4  
C
C
x C  
+ C  
(
+
6
)(  
)
3
04  
04  
17  
D1  
D1  
2π L1 C  
+
+ C  
STRAY  
C
+ C + C + C  
03 4  
17  
3
_______________________________________________________________________________________  
9

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