ternal capacitances are 12pF to V–" />
參數(shù)資料
型號(hào)： LTC6403CUD-1#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 7/20頁(yè)
文件大?。?/td> 0K
描述： IC AMP/DRIVER LN LP 16-QFN
標(biāo)準(zhǔn)包裝： 2,500
類型： ADC 驅(qū)動(dòng)器
應(yīng)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(yīng)商設(shè)備封裝： 16-QFN-EP（3x3）
包裝： 帶卷 (TR)
LTC6403-1
15
64031fa
These pins each have an output impedance of 100
Ω. In-
ternal capacitances are 12pF to V– on each ltered output,
plus an additional 12pF capacitor connected differentially
between the two ltered outputs. This resistor/capacitor
combination creates ltered outputs that look like a se-
ries 100
Ω resistor with a 36pF capacitor shunting each
ltered output to AC ground, providing a –3dB bandwidth
of 44.2MHz, and a noise bandwidth of 69.4MHz. The
lter cutoff frequency is easily modied with just a few
external components. To increase the cutoff frequency,
simply add 2 equal value resistors, one between +OUT
and +OUTF and the other between –OUT and –OUTF
(Figure 7). These resistors, in parallel with the internal
100
Ω resistors, lower the overall resistance and therefore
increase lter bandwidth. For example, to double the lter
bandwidth, add two external 100
Ω resistors to lower the
series lter resistance to 50
Ω. The 36pF of capacitance
remains unchanged, so lter bandwidth doubles. Keep in
mind, the series resistance also serves to decouple the
outputs from load capacitance. The unltered outputs of
the LTC6403-1 are designed to drive 10pF to ground or
5pF differentially, so care should be taken to not lower the
effective impedance between +OUT and +OUTF or –OUT
and –OUTF below 25
Ω.
To decrease lter bandwidth, add two external capacitors,
one from +OUTF to ground, and the other from –OUTF to
ground. A single differential capacitor connected between
APPLICATIONS INFORMATION
+OUTF and –OUTF can also be used, and since it is being
driven differentially it will appear at each ltered output
as a single-ended capacitance of twice the value. To halve
the lter bandwidth, for example, two 36pF capacitors
could be added (one from each ltered output to ground).
Alternatively, one 18pF capacitor could be added between
the ltered outputs, again halving the lter bandwidth.
Combinations of capacitors could be used as well; a three
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).
Figure 7. LTC6403-1 Filter Topology Modied for 2x
Filter Bandwidth (2 External Resistors)
Figure 6. LTC6403-1 Internal Filter Topology
Figure 8. LTC6403-1 Filter Topology Modied for 1/2x
Filter Bandwidth (3 External Capacitors)
–
+
7
+OUT
8
+OUTF
14
–OUT
13
–OUTF
12
V–
9
V–
64031 F06
LTC6403-1
FILTERED OUTPUT
(44.2MHz)
100
Ω
12pF
100
Ω
–
+
7
+OUT
8
+OUTF
14
–OUT
13
–OUTF
12
V–
9
V–
64031 F07
LTC6403-1
FILTERED OUTPUT
(88.4MHz)
100
Ω
100
Ω
12pF
100
Ω
100
Ω
–
+
7
+OUT
8
+OUTF
14
–OUT
13
–OUTF
12
V–
9
V–
64031 F08
LTC6403-1
FILTERED OUTPUT
(22.1MHz)
100
Ω
12pF
100
Ω
12pF
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LTC6403IUD-1-TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:200MHz, Low Noise, Low Power Fully Differential Input/Output Amplifi er/Driver
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