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    參數(shù)資料
    型號: LTC2257CUJ-14#TRPBF
    廠商: Linear Technology
    文件頁數(shù): 11/34頁
    文件大小: 0K
    描述: IC ADC 14BIT 40MSPS 1.8V 40-QFN
    產(chǎn)品培訓模塊: LTC2262 - Ultra Low Power High Speed ADCs
    標準包裝: 2,000
    位數(shù): 14
    采樣率(每秒): 40M
    數(shù)據(jù)接口: 并聯(lián),串行,SPI
    轉換器數(shù)目: 1
    功率耗散(最大): 54mW
    電壓電源: 單電源
    工作溫度: 0°C ~ 70°C
    安裝類型: 表面貼裝
    封裝/外殼: 40-WFQFN 裸露焊盤
    供應商設備封裝: 40-QFN(6x6)
    包裝: 帶卷 (TR)
    輸入數(shù)目和類型: 1 個差分
    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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    LTC2257IUJ-12#TRPBF 功能描述:IC ADC 12BIT 40MSPS 1.8V 40-QFN RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:1,000 系列:- 位數(shù):12 采樣率(每秒):300k 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:1 功率耗散(最大):75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC(0.295",7.50mm 寬) 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端,單極;1 個單端,雙極
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    LTC2257IUJ-12-TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:12-Bit, 65/40/2 5Msps Ultralow Power 1.8V ADCs
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