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參數(shù)資料
| 型號： | LTC6404HUD-4#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP/DRIVER DIFF 16-QFN |
| 標準包裝： | 2,500 |
| 類型： | ADC 驅(qū)動器 |
| 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) |
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LTC6404
23
6404f
In single supply applications, where the LTC6404 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, but must be capable of driving the input
impedance presented by the VOCM as listed in the Electri-
cal Characteristics Table. This impedance can be assumed
to be connected to a mid-supply potential. If an external
reference drives the VOCM pin, it should still be bypassed
with a high quality 0.01μF or larger capacitor to a low
impedance ground plane to lter any thermal noise and
to prevent common mode signals on this pin from being
inadvertently converted to differential signals.
Output Filter Considerations and Use
Filtering at the output of the LTC6404 is often desired to
provide either anti-aliasing or improved signal to noise
ratio. To simplify this ltering, the LTC6404 includes an
additional pair of differential outputs (OUTF+ and OUTF–)
which incorporate an internal lowpass lter network with
a –3dB bandwidth of 88.5MHz (Figure 6).
These pins each have a DC output impedance of 50
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 series
50
Ω resistor with a 36pF capacitor shunting each ltered
output to AC ground, providing a –3dB bandwidth of
APPLICATIONS INFORMATION
88.5MHz, and a noise bandwidth of 139MHz. 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 50
Ω resistor, lower the overall
resistance and therefore increase lter bandwidth. For
example, to double the lter bandwidth, add two external
50
Ω resistors to lower the series lter resistance to 25Ω.
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 LTC6404 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
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 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
Figure 7. LTC6404 Filter Topology Modied for 2x Filter
Bandwidth (2 External Resistors)
Figure 6. LTC6404 Internal Filter Topology
–
+
7
OUT+
8
OUTF+
14
OUT–
13
OUTF–
12
V–
9
V–
6404 F06
LTC6404
FILTERED OUTPUT
(88.5MHz)
50Ω
12pF
50Ω
–
+
7
OUT+
8
OUTF+
14
OUT–
13
OUTF–
12
V–
9
V–
6404 F07
LTC6404
FILTERED OUTPUT
(176MHz)
50Ω
49.9Ω
12pF
50Ω
49.9Ω
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| LTC6404IUD-1#PBF | 功能描述:IC AMP/DRIVER DIFF 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 標準包裝: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 |
| LTC6404IUD-1#TRPBF | 功能描述:IC AMP/DRIVER DIFF 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 標準包裝: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 |
| LTC6404IUD-1-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:600MHz, Low Noise, High Precision Fully Differential Input/Output Amplifi er/Driver |
| LTC6404IUD-1-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:600MHz, Low Noise, High Precision Fully Differential Input/Output Amplifi er/Driver |
| LTC6404IUD-2#PBF | 功能描述:IC AMP/DRIVER DIFF 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 標準包裝: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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