參數(shù)資料
型號: LTC6404HUD-4#TRPBF
廠商: Linear Technology
文件頁數(shù): 17/28頁
文件大小: 0K
描述: IC AMP/DRIVER DIFF 16-QFN
標準包裝: 2,500
類型: ADC 驅動器
應用: 數(shù)據(jù)采集
安裝類型: 表面貼裝
封裝/外殼: 16-WFQFN 裸露焊盤
供應商設備封裝: 16-QFN-EP(3x3)
包裝: 帶卷 (TR)
LTC6404
24
6404f
Figure 8. LTC6404 Filter Topology Modied for 1/2x Filter
Bandwidth (3 External Capacitors)
capacitor solution of 12pF from each ltered output to
ground plus a 12pF capacitor between the ltered outputs
would also halve the lter 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 amplier, the surrounding feedback resistors also
contribute noise. A noise model is shown in Figure 9.
The output noise generated by both the amplier and the
feedback components is governed by the equation:
e
R
IR
e
no
ni
F
I
nF
n
=
+
+
() +
12
2
R
RI
F
I
nRF
R
e
+
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
6404 F08
LTC6404
FILTERED OUTPUT
(44.25MHz)
50Ω
12pF
50Ω
12pF
+
1
SHDN
5
6
IN
7
OUT+
8
OUTF+
16
15
IN+
NC
14
OUT
13
OUTF
eno
2
RF2
2
V+
3
V
V+
V
V+
V
VOCM
12
V
11
V+
10
V+
9
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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