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  • 參數(shù)資料
    型號: AD9736BBC
    廠商: Analog Devices Inc
    文件頁數(shù): 33/72頁
    文件大?。?/td> 0K
    描述: IC DAC 14BIT 1.2GSPS 160CSPBGA
    產(chǎn)品培訓(xùn)模塊: Data Converter Fundamentals
    DAC Architectures
    標(biāo)準(zhǔn)包裝: 1
    位數(shù): 14
    數(shù)據(jù)接口: 并聯(lián)
    轉(zhuǎn)換器數(shù)目: 1
    電壓電源: 模擬和數(shù)字
    功率耗散(最大): 550mW
    工作溫度: -40°C ~ 85°C
    安裝類型: 表面貼裝
    封裝/外殼: 160-LFBGA,CSPBGA
    供應(yīng)商設(shè)備封裝: 160-CSPBGA(12x12)
    包裝: 托盤
    輸出數(shù)目和類型: 2 電流,單極
    采樣率(每秒): 1.2G
    AD9734/AD9735/AD9736
    Rev. A | Page 39 of 72
    INTERPOLATION FILTER
    In 2× mode, the input data is interpolated by a factor of 2 so
    that it aligns with the DAC update rate. The interpolation filter
    is a hard-coded, 55-tap, symmetric FIR with a 0.001 dB pass-
    band flatness and a stop-band attenuation of about 90 dB. The
    transition band runs from 20% of fDAC to 30% of fDAC. The FIR
    response is shown in Figure 75 where the frequency axis is
    normalized to fDAC. Figure 76 shows the pass-band flatness and
    Table 23 shows the 16-bit filter coefficients.
    Table 23. FIR Interpolation Filter Coefficients
    Coefficient Number
    Tap Weight
    1
    55
    7
    2
    54
    0
    3
    53
    +24
    4
    52
    0
    5
    51
    62
    6
    50
    0
    7
    49
    +135
    8
    48
    0
    9
    47
    263
    10
    46
    0
    11
    45
    +471
    12
    44
    0
    13
    43
    793
    14
    42
    0
    15
    41
    +1273
    16
    40
    0
    17
    39
    1976
    18
    38
    0
    19
    37
    +3012
    20
    36
    0
    21
    35
    4603
    22
    34
    0
    23
    33
    +7321
    24
    32
    0
    25
    31
    13270
    26
    30
    0
    27
    29
    +41505
    28
    +65535
    04862-073
    FREQUENCY NORMALIZED TO
    fDAC
    0.50
    0
    0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45
    MAGNIT
    UDE
    (d
    B)
    0
    –10
    –20
    –30
    –40
    –50
    –60
    –70
    –80
    –90
    –100
    Figure 75. Interpolation Filter Response
    04862-074
    FREQUENCY NORMALIZED TO
    fDAC
    0.25
    0
    0.10
    0.05
    0.15
    0.20
    MA
    GN
    ITU
    D
    E
    (
    d
    B
    )
    0.10
    0.06
    0.08
    0.02
    –0.02
    –0.06
    0.04
    0
    –0.04
    –0.08
    –0.10
    Figure 76. Interpolation Filter Pass-Band Flatness
    DATA INTERFACE CONTROLLERS
    Two internal controllers are utilized in the operation of the
    AD973x. The first controller helps maintain optimum LVDS
    data sampling; the second controller helps maintain optimum
    synchronization between the DACCLK and the incoming data.
    The LVDS controller is responsible for optimizing the sampling
    of the data from the LVDS bus (DB13:0), while the sync
    controller resolves timing problems between the DAC_CLK
    (CLK+, CLK) and the DATACLK. A block diagram of these
    controllers is shown in Figure 77.
    DATACLK_OUT
    DATACLK
    DATACLK_IN
    FIFO
    DAC
    LVDS
    SAMPLE
    LOGIC
    CLK
    CONTROL
    LVDS
    CONTROLLER
    DB<13:0>
    DATA
    SOURCE
    i.e., FPGA
    SYNC
    LOGIC
    SYNC
    CONTROLLER
    04862-075
    Figure 77. Data Controllers
    The controllers are clocked with a divided-down version of the
    DAC_CLK. The divide ratio is set utilizing the controller clock
    predivider bits (CCD<3:0>) located at Reg. 22, Bits 3:0 to
    generate the controller clock as follows:
    Controller Clock = DAC_CLK/(2(CCD<3:0> + 4))
    Note that the controller clock cannot exceed 10 MHz for correct
    operation. Until CCD<3:0> is properly programmed to meet
    this requirement, the DAC output may not be stable. This
    means the FIFO cannot be enabled in PIN_MODE unless the
    DACCLK is less than 160 MHz.
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