參數(shù)資料
型號(hào): LTC6605CDJC-14#TRPBF
廠商: Linear Technology
文件頁(yè)數(shù): 7/20頁(yè)
文件大?。?/td> 0K
描述: IC FILTER 14MHZ DUAL 22-DFN
標(biāo)準(zhǔn)包裝: 2,500
濾波器類型: 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
安裝類型: 表面貼裝
封裝/外殼: 22-WFDFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 22-DFN(6x3)裸露焊盤
包裝: 帶卷 (TR)
LTC6605-14
15
660514f
APPLICATIONS INFORMATION
Noise
When comparing the LTC6605-14’s noise to that of
other ampliers, be sure to compare similar speci-
cations. Standalone op amps often specify noise re-
ferred to the inputs of the op amp. The LTC6605-14’s
internal op amp has input referred voltage noise of
only 2.1nV/√Hz. In addition to the noise generated 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.
Figure 7a. Differential Noise Model
Figure 7b
Figure 7c
+
660514 F07a
R1
R3
eni2
eno2
enR32
R3
enR32
R2
enR22
R2
enR22
enR12
In+2
In–2
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
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