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參數(shù)資料
| 型號： | LTC6405CMS8E#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 281K |
| 代理商： | LTC6405CMS8E#PBF |
LTC6405
18
6405fa
Output Common Mode Voltage Range
The output common mode voltage is dened as the aver-
age of the two outputs:
V
OUTCM = VOCM =
V+OUT + V–OUT
2
The VOCM pin sets this average by an internal common
mode feedback loop which internally forces VOUTCM=VOCM.
The output common mode range extends from 0.5V above
V– to typically 1V below V+. The VOCM voltage is internally
set by a resistive divider between the supplies, developing
a default voltage potential of 2.5V with a 5V supply.
In single supply applications, where the LTC6405 is used
to interface to an ADC, the optimal common mode input
range to the ADC is often determined by the ADC’s refer-
ence. If the ADC makes a reference available for setting
the input common mode voltage, it can be directly tied
to the VOCM pin (as long as it is able to drive the 19kΩ
Thevenin equivalent input impedance presented by the
VOCM pin).
The VOCM pin should be bypassed with a high quality
ceramic bypass capacitor of at least 0.01μF to lter any
common mode noise rather than being converted to dif-
ferential noise and to prevent common mode signals on
this pin from being inadvertently converted to differential
signals by impedance mismatches both externally and
internally to the IC.
APPLICATIONS INFORMATION
Output Filter Considerations and Use
Filtering at the output of the LTC6405 is often desired to
provide anti-aliasing or to improve signal to noise ratio.
To simplify this ltering, the LTC6405 in the QFN package
includes an additional pair of differential outputs (+OUTF
and –OUTF) which incorporate an internal lowpass RC
network with a –3dB bandwidth of 850MHz (Figure 7).
These pins each have an output resistance of 50Ω (toler-
ance ±12%). Internal capacitances are 1.25pF (tolerance
±15%) to V– on each ltered output, plus an additional
1.25pF (tolerance ±15%) capacitor connected between the
two ltered outputs. This resistor/capacitor combination
creates ltered outputs that look like a series 50Ω resistor
with a 3.75pF capacitor shunting each ltered output to
AC ground, providing a –3dB bandwidth of 850MHz, and
a noise bandwidth of 1335MHz. The lter cutoff frequency
is easily modied with just a few external components. To
increase the cutoff frequency, simply add two equal value
resistors, one between +OUT and +OUTF and the other
between –OUT and –OUTF (Figure 8). These resistors, in
parallel with the internal 50Ω resistors, lower the overall
resistance and therefore increase lter bandwidth. For
example, to double the lter bandwidth, add two external
50Ω resistors to lower the series lter resistance to 25Ω.
The 3.75pF of capacitance remains unchanged, so lter
bandwidth doubles. Keep in mind, the series resistance
also serves to decouple the outputs from load capacitance.
Figure 7. LTC6405 Internal Filter Topology
–
+
7
+OUT
8
+OUTF
14
–OUT
13
–OUTF
+OUTF
–OUTF
1.25pF
50Ω
1.25pF
12
V–
9
V–
6405 F07
LTC6405
FILTERED OUTPUT
Figure 8. LTC6405 Filter Topology Modied for 2x Filter
Bandwidth (Two External Resistors)
–
+
7
8
14
13
12
V–
9
V–
6405 F08
LTC6405
FILTERED OUTPUT
(1.7GHz)
+OUTF
–OUTF
49.9Ω
1.25pF
50Ω
1.25pF
+OUT
+OUTF
–OUT
–OUTF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC6405CMS8E-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2.7GHz, 5V, Low Noise, Rail-to-Rail Input Differential Amplifi er/Driver |
| 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 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變增益放大器 應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| 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 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變增益放大器 應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
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