參數(shù)資料
型號(hào): LTC6605CDJC-7#TRPBF
廠商: Linear Technology
文件頁(yè)數(shù): 7/20頁(yè)
文件大?。?/td> 0K
描述: IC FILTER 7MHZ DUAL 22-DFN
標(biāo)準(zhǔn)包裝: 2,500
濾波器類(lèi)型: 抗混迭
頻率 - 截止或中心: 5MHz
濾波器數(shù): 2
濾波器階數(shù): 2nd
電源電壓: 2.7 V ~ 5.25 V
安裝類(lèi)型: 表面貼裝
封裝/外殼: 22-WFDFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝: 22-DFN(6x3)裸露焊盤(pán)
包裝: 帶卷 (TR)
LTC6605-7
15
66057f
APPLICATIONS INFORMATION
Noise
When comparing the LTC6605-7’s noise to that of other
ampliers, be sure to compare similar specications. Stand-
aloneopampsoftenspecifynoisereferredtotheinputsofthe
op amp. The LTC6605-7’s internal op amp has input referred
voltage noise of only 2.1nV/√Hz. In addition to the noise gen-
erated by the amplier, the surrounding feedback resistors
also contribute noise. A noise model is shown in Figure 7a.
The output spot noise generated by both the amplier
and the feedback components is given in Figure 7b.
Substituting the equation for Johnson noise of a resistor
(e2nR = 4kTR) into the equation in Figure 7b and simplify-
ing gives the result shown in Figure 7c.
Board Layout and Bypass Capacitors
For single-supply applications it is recommended that a
high quality X5R or X7R, 0.1μF bypass capacitor be placed
directly between V+ and the adjacent Vpin. The Vpins,
including the Exposed Pad, should be tied directly to a low
impedance ground plane with minimal routing.
Figure 7a. Differential Noise Model
Figure 7b
Figure 7c
eno =
eni 1+
R2
R1
2
+ 2 In R2 + R3 1+
R2
R1
2
+ 2 enR1
R2
R1
2
+ 2 enR3 1+
R2
R1
2
+ 2enR2
2
eno =
eni 1+
R2
R1
2
+ 2 In R2 + R3 1+
R2
R1
2
+ 8 k T R2 1+
R2
R1
+ R3 1+
R2
R1
2
+
66057 F07a
R1
R3
eni2
eno2
enR32
R3
enR32
R2
enR22
R2
enR22
enR12
In+2
In–2
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