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LTC6404 데이터시트(PDF) 24 Page - Linear Technology

부품명 LTC6404
상세설명  600MHz, Low Noise, High Precision Fully Differential Input/Output Amplifi er/Driver
PDF  28 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTC6404 데이터시트(HTML) 24 Page - Linear Technology

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LTC6404
24
6404f
Figure 8. LTC6404 Filter Topology Modified for 1/2x Filter
Bandwidth (3 External Capacitors)
capacitor solution of 12pF from each filtered output to
ground plus a 12pF capacitor between the filtered outputs
would also halve the filter bandwidth (Figure 8).
Noise Considerations
The LTC6404’s input referred voltage noise is on the
order of 1.5nV/√Hz. Its input referred current noise is on
the order of 3pA/√Hz. In addition to the noise generated
by the amplifier, the surrounding feedback resistors also
contribute noise. A noise model is shown in Figure 9.
The output noise generated by both the amplifier and the
feedback components is governed by the equation:
e
e
R
R
IR
e
no
ni
F
I
nF
n
=
+
⎛
⎝⎜
⎞
⎠⎟
⎛
⎝⎜
⎞
⎠⎟
+
() +
••
•
•
12
2
2
2
R
RI
F
I
nRF
R
R
e
••
⎛
⎝⎜
⎞
⎠⎟
⎛
⎝⎜
⎞
⎠⎟
+
2
2
2
A plot of this equation, and a plot of the noise generated
by the feedback components for the LTC6404 is shown
in Figure 10.
APPLICATIONS INFORMATION
Figure 9. Noise Model of the LTC6404
–
+
7
OUT+
8
OUTF+
14
OUT–
13
OUTF–
12
V–
9
V–
V–
V–
6404 F08
LTC6404
FILTERED OUTPUT
(44.25MHz)
50Ω
12pF
12pF
12pF
12pF
12pF
50Ω
12pF
–
+
1
SHDN
5
6
IN–
7
OUT+
8
OUTF+
16
15
IN+
NC
NC
14
OUT–
13
OUTF–
eno
2
RF2
2
V+
3
V–
V+
V+
V–
V+
V–
VOCM
VOCM
12
V–
11
V+
10
V+
9
V–
V–
V–
6404 F09
LTC6404
enof
2
enRI2
2
SHDN
RF1
RI2
RI1
V–
V+
V–
4
enRF2
2
enRI1
2
encm
2
eni
2
enRF1
2
in
+2
in
–2



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