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參數(shù)資料
| 型號： | DC1369A-G |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 10/34頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD DEMO 125MSPS LTC2261-12 |
| 軟件下載： | QuikEval II System |
| 設計資源： | DC1369A Design Files |
| 標準包裝： | 1 |
| 系列： | * |
| 相關產(chǎn)品： | DC890B-ND - BOARD USB DATA COLLECTION |
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LTC2261-12
LTC2260-12/LTC2259-12
18
226112fc
For more information www.linear.com/LTC2261-12
CONVERTER OPERATION
TheLTC2261-12/LTC2260-12/LTC2259-12arelowpower
12-bit125Msps/105Msps/80MspsA/Dconvertersthatare
poweredbyasingle1.8Vsupply.Theanaloginputsshould
be driven differentially. The encode input can be driven
differentially or single ended for lower power consump-
tion. The digital outputs can be CMOS, double-data rate
CMOS(tohalvethenumberofoutputlines),ordouble-data
rate LVDS (to reduce digital noise in the system.) Many
additional features can be chosen by programming the
mode control registers through a serial SPI port. See the
Serial Programming Mode section.
ANALOG INPUT
The analog input is a differential CMOS sample-and-hold
circuit (Figure 2). The inputs should be driven differentially
around a common mode voltage set by the VCM output
pin, which is nominally VDD/2. For the 2V input range,
the inputs should swing from VCM – 0.5V to VCM + 0.5V.
Thereshouldbe180°phasedifferencebetweentheinputs.
INPUT DRIVE CIRCUITS
Input Filtering
If possible, there should be an RC lowpass filter right at
the analog inputs. This lowpass filter isolates the drive
circuitry from the A/D sample-and-hold switching, and
alsolimitswidebandnoisefromthedrivecircuitry.Figure 3
shows an example of an input RC filter. The RC component
values should be chosen based on the application’s input
frequency.
Transformer Coupled Circuits
Figure 3 shows the analog input being driven by an RF
transformer with a center-tapped secondary. The center
tap is biased with VCM, setting the A/D input at its optimal
DC level. At higher input frequencies a transmission line
CSAMPLE
3.5pF
RON
25
RON
25
VDD
LTC2261-12
AIN+
226112 F02
CSAMPLE
3.5pF
VDD
AIN–
ENC–
ENC+
1.2V
10k
1.2V
10k
CPARASITIC
1.8pF
CPARASITIC
1.8pF
10
25
50
0.1F
AIN+
AIN–
12pF
0.1F
VCM
LTC2261-12
ANALOG
INPUT
0.1F
T1
1:1
T1: MA/COM MABAES0060
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
226112 F03
Figure 2. Equivalent Input Circuit
Figure 3. Analog Input Circuit Using a Transformer.
Recommended for Input Frequencies from 5MHz to 70MHz
applicaTions inForMaTion
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| DC1369A-A | BOARD DEMO 125MSPS LTC2261-14 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
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| DC1369A-H | 功能描述:BOARD DEMO 105MSPS LTC2260-12 RoHS:是 類別:未定義的類別 >> 其它 系列:* 標準包裝:1 系列:* 其它名稱:MS305720A |
| DC1369A-I | 功能描述:BOARD DEMO 80MSPS LTC2259-12 RoHS:是 類別:未定義的類別 >> 其它 系列:* 標準包裝:1 系列:* 其它名稱:MS305720A |
| DC1369A-J | 制造商:Linear Technology 功能描述:12BIT ADC Eval Brd, Rq. DC1371 & DC1075 制造商:Linear Technology 功能描述:12BIT ADC Eval Brd, Rq. DC1371 & DC1075; Silicon Manufacturer:Linear Technology; Silicon Core Number:LTC2258-12; Kit Application Type:Data Converter; Application Sub Type:ADC; Kit Contents:Board, Guide |
| DC1369A-K | 制造商:Linear Technology 功能描述:12BIT ADC Eval Brd, Rq. DC1371 & DC1075 制造商:Linear Technology 功能描述:12BIT ADC Eval Brd, Rq. DC1371 & DC1075; Silicon Manufacturer:Linear Technology; Silicon Core Number:LTC2257-12; Kit Application Type:Data Converter; Application Sub Type:ADC; Kit Contents:Board, Guide |
| DC1369A-L | 制造商:Linear Technology 功能描述:12BIT ADC Eval Brd, Rq. DC1371 & DC1075 制造商:Linear Technology 功能描述:12BIT ADC Eval Brd, Rq. DC1371 & DC1075; Silicon Manufacturer:Linear Technology; Silicon Core Number:LTC2256-12; Kit Application Type:Data Converter; Application Sub Type:ADC; Kit Contents:Board, Guide |
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