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參數(shù)資料
| 型號： | LTC2206UK-14 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 14-Bit, 105Msps/80Msps ADCs |
| 中文描述： | PROPRIETARY METHOD ADC, PQCC48 |
| 封裝： | 7 X 7 MM, PLASTIC, MO-220WKKD-2, QFN-48 |
| 文件頁數(shù)： | 18/32頁 |
| 文件大?。?/td> | 1298K |
| 代理商： | LTC2206UK-14 |
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LTC2207-14/LTC2206-14
18
220714614fa
INPUT DRIVE CIRCUITS
Input Filtering
A first order RC lowpass filter at the input of the ADC can
serve two functions: limit the noise from input circuitry and
provide isolation from ADC S/H switching. The LTC2207-
14/LTC2206-14 have a very broadband S/H circuit, DC to
700MHz; it can be used in a wide range of applications;
therefore, it is not possible to provide a single recom-
mended RC filter.
Figures 3, 4a and 4b show three examples of input RC
filtering at three ranges of input frequencies. In general
it is desirable to make the capacitors as large as can be
tolerated–this will help suppress random noise as well
as noise coupled from the digital circuitry. The LTC2207-
14/LTC2206-14 do not require any input filter to achieve
data sheet specifications; however, no filtering will put
more stringent noise requirements on the input drive
circuitry.
Transformer Coupled Circuits
Figure 3 shows the LTC2207-14/LTC2206-14 being driven
by an RF transformer with a center-tapped secondary. The
secondary center tap is DC biased with V
CM
, setting the
ADC input signal at its optimum DC level. Figure 3 shows
a 1:1 turns ratio transformer. Other turns ratios can be
used; however, as the turns ratio increases so does the
impedance seen by the ADC. Source impedance greater
than 50
Ω
can reduce the input bandwidth and increase
high frequency distortion. A disadvantage of using a
transformer is the loss of low frequency response. Most
small RF transformers have poor performance at frequen-
cies below 1MHz.
Center-tapped transformers provide a convenient means
of DC biasing the secondary; however, they often show
poor balance at high input frequencies, resulting in large
2nd order harmonics.
Figure 4a shows transformer coupling using a transmis-
sion line balun transformer. This type of transformer has
much better high frequency response and balance than
flux coupled center tap transformers. Coupling capacitors
are added at the ground and input primary terminals to
allow the secondary terminals to be biased at 1.25V. Figure
4b shows the same circuit with components suitable for
higher input frequencies.
APPLICATIONS INFORMATION
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC2207-14 | 14-Bit, 105Msps/80Msps ADCs |
| LTC2207CUK-14 | 14-Bit, 105Msps/80Msps ADCs |
| LTC2207IUK-14 | 14-Bit, 105Msps/80Msps ADCs |
| LTC2207UK-14 | 14-Bit, 105Msps/80Msps ADCs |
| LTC2206 | 16-Bit, 105Msps/80Msps ADCs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC2207 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 20Msps Low Power ADC |
| LTC2207-14 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:14-Bit, 105Msps/80Msps ADCs |
| LTC2207CUK | 制造商:Linear Technology 功能描述:ADC Single Pipelined 105Msps 16-bit Parallel 48-Pin QFN EP |
| LTC2207CUK#PBF | 制造商:Linear Technology 功能描述:ADC Single Pipelined 105Msps 16-bit Parallel 48-Pin QFN EP 制造商:Linear Technology 功能描述:IC ADC 16-BIT 105MSPS 48-QFN 制造商:Linear Technology 功能描述:IC ADC 16BIT 105MSPS QFN-48 制造商:Linear Technology 功能描述:ADC 16BIT 105MSPS 48QFN 制造商:Linear Technology 功能描述:IC, ADC, 16BIT, 105MSPS, QFN-48; Resolution (Bits):16bit; Sampling Rate:105MSPS; Supply Voltage Type:Single; Supply Voltage Min:3.135V; Supply Voltage Max:3.465V; Supply Current:273mA; Digital IC Case Style:QFN; No. of Pins:48 ;RoHS Compliant: Yes |
| LTC2207CUK#PBF | 制造商:Linear Technology 功能描述:IC, ADC, 16BIT, 105MSPS, QFN-48 |
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