For more information www.linear.com/LTC2258-14 applicaTion" />
參數(shù)資料
型號(hào): LTC2257IUJ-14#TRPBF
廠商: Linear Technology
文件頁(yè)數(shù): 11/34頁(yè)
文件大?。?/td> 0K
描述: IC ADC 14BIT 40MSPS 1.8V 40-QFN
產(chǎn)品培訓(xùn)模塊: LTC2262 - Ultra Low Power High Speed ADCs
標(biāo)準(zhǔn)包裝: 2,000
位數(shù): 14
采樣率(每秒): 40M
數(shù)據(jù)接口: 并聯(lián),串行,SPI
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 54mW
電壓電源: 單電源
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 40-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 40-QFN(6x6)
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 1 個(gè)差分
配用: DC718C-ND - DEMO QUIKEVAL-II DATA
19
225814fc
LTC2258-14
LTC2257-14/LTC2256-14
For more information www.linear.com/LTC2258-14
applicaTions inForMaTion
Figure 5. Recommended Front-End Circuit for Input
Frequencies from 170MHz to 270MHz
Figure 6. Recommended Front-End Circuit for Input
Frequencies Above 270MHz
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.
Figure 4. Recommended Front-End Circuit for Input
Frequencies from 70MHz to 170MHz
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
balun transformer (Figures 4 to 6) has better balance,
resulting in lower A/D distortion.
25
50
0.1F
AIN+
AIN–
4.7pF
0.1F
VCM
ANALOG
INPUT
0.1F
T1
T2
T1: MA/COM MABA-007159-000000
T2: MA/COM MABAES0060
RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE
225814 F04
LTC2258-14
25
50
0.1F
AIN+
AIN–
1.8pF
0.1F
VCM
ANALOG
INPUT
0.1F
T1
T2
T1: MA/COM MABA-007159-000000
T2: COILCRAFT WBC1-1LB
RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE
225814 F05
LTC2258-14
25
50
0.1F
2.7nH
AIN+
AIN–
0.1F
VCM
ANALOG
INPUT
0.1F
T1
T1: MA/COM ETC1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
225814 F06
LTC2258-14
25
50
0.1F
AIN+
AIN–
12pF
0.1F
VCM
LTC2258-14
ANALOG
INPUT
0.1F
T1
1:1
T1: MA/COM MABAES0060
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
225814 F03
Figure 3. Analog Input Circuit Using a Transformer.
Recommended for Input Frequencies from 5MHz to 70MHz
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