參數(shù)資料
型號(hào)： DAC5674EVM
廠商： Texas Instruments
文件頁(yè)數(shù)： 14/39頁(yè)
文件大?。?/td> 0K
描述： EVAL MODULE FOR DAC5674
產(chǎn)品培訓(xùn)模塊： Data Converter Basics
標(biāo)準(zhǔn)包裝： 1
系列： CommsDAC™
DAC 的數(shù)量： 1
位數(shù)： 14
采樣率（每秒）： 400M
數(shù)據(jù)接口： 并聯(lián)
設(shè)置時(shí)間： 20ns
DAC 型： 電流
工作溫度： -40°C ~ 85°C
已供物品： 板
已用 IC / 零件： DAC5674
相關(guān)產(chǎn)品： DAC5674IPHPRG4-ND - IC DAC 14BIT 400MSPS 48-HTQFP
DAC5674IPHPR-ND - IC DAC 14BIT 400MSPS 48-HTQFP
DAC5674IPHPG4-ND - IC DAC 14BIT 400MSPS 48-HTQFP
296-15726-ND - IC DAC 14BIT 400MSPS 48-HTQFP
其它名稱： 296-30860
DAC5674EVM-ND
DAC5674
SLWS148A SEPTEMBER 2003 REVISED OCTOBER 2005
www.ti.com
21
PFD
ref
ICO
Fref
Fvco
LPF
R
C1
C2
DAC5674
External Loop Filter
PN
Figure 22. PLL Functional Block Diagram
Table 5. DAC5674 Evaluation Board PLL Loop Filter Parameters
N(1)
PHASE MARGIN (DEGREES)
BANDWIDTH (MHZ)
2
60
1.6
4
71
1.4
8
77
1
16
78
0.7
32
74
0.4
(1) N is the VCO divide-down factor from prescale and interpolation.
Non-Harmonic Clock-Related Spurious Signals
In interpolating DACs, imperfect isolation between the digital and DAC clock circuits generates spurious signals
at frequencies related to the DAC clock rate. The digital interpolation filters in these DACs run at subharmonic
frequencies of the output rate clock, where these frequencies are fDAC/2 , N = 1,2. For example, for 2×
interpolation only one interpolation filter runs at fDAC/2; for 4× interpolation, on the other hand, two interpolation
filters run at fDAC/2 and fDAC/4. These lower-speed clocks for the interpolation filter mix with the DAC clock
circuit and create spurious images of the wanted signal and second Nyquist-zone image at offsets of fDAC/2N.
Figure 23 shows the location of the largest spurious signals for 4
× interpolation for a real signal. With a real
output signal, there is no distinction between negative and positive frequencies, and therefore the signals that
appear at negative frequencies wrap and potentially fall near the wanted signal. In particular, at IFs near fDAC/8,
fDAC/4, and fDAC × 3/4 (50 MHz, 100 MHz, and 150 MHz in this example), the mixing effect results in spurious
signals falling near the wanted signal, which may present a problem depending on the system application. For
a frequency-symmetric signal (such as a single WCDMA or CDMA carrier), operating at exactly fDAC/8, fDAC/4
and fDAC × 3/4, the spurious signal falls completely inside the wanted signal, which produces a clean spectrum
but may result in degradation of the signal quality.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DAC5674IPHP 功能描述:數(shù)模轉(zhuǎn)換器- DAC 14-Bit 400 CommsDAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
DAC5674IPHPG4 功能描述:數(shù)模轉(zhuǎn)換器- DAC 14-Bit 400 CommsDAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
DAC5674IPHP-ND 制造商: 功能描述: 制造商:undefined 功能描述:
DAC5674IPHPR 功能描述:數(shù)模轉(zhuǎn)換器- DAC 14-Bit 400 CommsDAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
DAC5674IPHPRG4 功能描述:數(shù)模轉(zhuǎn)換器- DAC 14-Bit 400 CommsDAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
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