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參數資料
型號: DC1369A-A
廠商: Linear Technology
文件頁數: 10/34頁
文件大小: 0K
描述: BOARD DEMO 125MSPS LTC2261-14
軟件下載: QuikEval II System
設計資源: DC1369A Design Files
標準包裝: 1
系列: *
相關產品: DC890B-ND - BOARD USB DATA COLLECTION
LTC2261-14
LTC2260-14/LTC2259-14
18
226114fc
For more information www.linear.com/LTC2261-14
CONVERTER OPERATION
TheLTC2261-14/LTC2260-14/LTC2259-14arelowpower
14-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
CSAMPLE
3.5pF
RON
25
RON
25
VDD
LTC2261-14
AIN+
226114 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
LTC2261-14
ANALOG
INPUT
0.1F
T1
1:1
T1: MA/COM MABAES0060
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
226114 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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相關代理商/技術參數
參數描述
DC1369A-B 功能描述:BOARD DEMO 105MSPS LTC2260-14 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-C 功能描述:BOARD DEMO 80MSPS LTC2259-14 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
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