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参数资料
| 型号： | LTC6405CMS8E#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封装： | LEAD FREE, MSOP-8 |
| 文件页数： | 11/24页 |
| 文件大小： | 281K |
| 代理商： | LTC6405CMS8E#TRPBF |
LTC6405
19
6405fa
APPLICATIONS INFORMATION
The outputs of the LTC6405 are designed to drive 5pF to
ground, so care should be taken to not lower the effec-
tive impedance between +OUT and +OUTF or –OUT and
–OUTF below 15Ω.
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
+OUTF and –OUTF can also be used, but 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 3.9pF capacitors
could be added (one from each ltered output to ground).
Alternatively, one 1.8pF capacitor could be added between
the ltered outputs, which also halves the lter bandwidth.
Combinations of capacitors could be used as well; a three
capacitor solution of 1.2pF from each ltered output to
ground plus a 1.2pF capacitor between the ltered outputs
would also halve the lter bandwidth (Figure 9).
Noise Considerations
The LTC6405’s input referred voltage noise is 1.6nV/√Hz.
Its input referred current noise is 2.4pA/√Hz. In addition
to the noise generated by the amplier, the surrounding
feedback resistors also contribute noise. A noise model is
shown in Figure 10. The output noise generated by both
the amplier and the feedback components is governed
by the equation:
e
no =
e
ni 1+
R
F
R
I
2
+ 2 I
n RF
()2 +
2 e
nRI
R
F
R
I
2
+ 2e
nRF
2
A plot of this equation, and a plot of the noise generated
by the feedback components for the LTC6405 is shown
in Figure 11.
Figure 9. LTC6405 Filter Topology Modied for 1/2x Filter
Bandwidth (Three External Capacitors)
–
+
7
8
14
13
12
V–
9
V –
V–
6405 F09
LTC6405
FILTERED OUTPUT
(425MHz)
1.25pF
50Ω
1.25pF
1.2pF
+OUTF
–OUTF
+OUT
+OUTF
–OUT
–OUTF
Figure 10. Noise Model of the LTC6405
Figure 11. LTC6405 Output Spot Noise vs Spot Noise
Contributed by Feedback Network Alone
–
+
eno
2
RF
VOCM
enRI
2
RF
RI
enRF
2
enRI
2
encm
2
eni
2
enRF
2
in
+2
in
–2
6405 F10
RI = RF (Ω)
10
0.1
1
10
100
1000
10000
6405 F11
TOTAL (AMPLIFIER AND
FEEDBACK NETWORK)
OUTPUT NOISE
FEEDBACK NETWORK
NOISE ALONE
nV
/
Hz
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6405CUD | 制造商:Linear Technology 功能描述:DIFF AMP 5V 2.7GHZ R/R 16QFN 制造商:Linear Technology 功能描述:DIFF AMP, 5V, 2.7GHZ, R/R, 16QFN |
| LTC6405CUD#PBF | 功能描述:IC DIFF AMP/DRIVER R-R 16-QFN RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| LTC6405CUD#TR | 制造商:Linear Technology 功能描述:DIFF-AMPLIFIER, 2.7GHZ, 690V/US, QFN-16, No. of Amplifiers:1, Input Offset Voltage:6mV, Bandwidth:2.7GHz, Amplifier Case Style:QFN, No. of Pins:16, Supply Voltage Range:4.5V to 5.25V, Slew Rate:690V/s, Supply Current:18mA, MSL:- , RoHS Compliant: No |
| LTC6405CUD#TRPBF | 功能描述:IC DIFF AMP/DRIVER R-R 16-QFN RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| LTC6405CUD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.7GHz, 5V, Low Noise, Rail-to-Rail Input Differential Amplifi er/Driver |
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