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參數資料
| 型號： | AD9775BSV |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | 14-Bit, 160 MSPS 2X/4X/8X Interpolating Dual TxDAC+ D/A Converter |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 0.011 us SETTLING TIME, 14-BIT DAC, PQFP80 |
| 封裝： | PLASTIC, MO-026-ADD-HD, TQFP-80 |
| 文件頁數： | 25/48頁 |
| 文件大?。?/td> | 6054K |
| 代理商： | AD9775BSV |
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REV. 0
AD9775
–25–
The programmable modes’ ONEPORTCLK inversion,
ONEPORTCLK driver strength, and IQ pairing described in
the previous section (PLL Enabled, One Port Mode) have
identical functionality with the PLL disabled.
t
OD
t
H
t
S
CLKIN
I AND Q INTERLEAVED
INPUT DATA AT PORT 1
ONEPORTCLK
IQSEL
t
IQH
t
IQS
t
OD
= 4.7ns
t
S
= 3.0ns
t
H
= –1.0ns
t
IQS
= 3.5ns
t
= –1.5ns
(TYP SPECS)
Figure 22. Timing Requirements in One Port
Input Mode with PLL Disabled
DIGITAL FILTER MODES
The I and Q data paths of the AD9775 have their own indepen-
dent half-band FIR filters. Each data path consists of three FIR
filters, providing up to 8
×
interpolation for each channel. The
rate of interpolation is determined by the state of Control Register
01h, Bits 7 and 6. Figures 1a–1c show the response of the digi-
tal filters when the AD9775 is set to 2
×
, 4
×
, and 8
×
modes. The
frequency axes of these graphs have been normalized to the input
data rate of the DAC. As the graphs show, the digital filters can
provide greater than 75 dB of out-of-band rejection.
An online tool is available for quick and easy analysis of the
AD9775 interpolation filters in the various modes. The link
can be accessed at:
www.analog.com/techSupport/designTools/
interactiveTools/dac/ad9777image.html
.
AMPLITUDE MODULATION
Given two sine waves at the same frequency, but with a 90 phase
difference, a point of view in time can be taken such that the
waveform that leads in phase is cosinusoidal and the waveform
that lags is sinusoidal.
Analysis of complex variables states that
the cosine waveform can be defined as having real positive and
negative frequency components, while the sine waveform consists
of imaginary positive and negative frequency images. This is
shown graphically in the frequency domain in Figure 23.
DC
DC
e
–j t
/2j
COSINE
SINE
e
–j t
/2
e
–j t
/2j
e
–j t
/2
Figure 23. Real and Imaginary Components of
Sinusoidal and Cosinusoidal Waveforms
Amplitude modulating a baseband signal with a sine or a cosine
convolves the baseband signal with the modulating carrier in the
frequency domain. Amplitude scaling of the modulated signal
reduces the positive and negative frequency images by a factor of
two. This scaling will be very important in the discussion of the
various modulation modes. The phase relationship of the modu-
lated signals is dependent on whether the modulating carrier is
sinusoidal or cosinusoidal, again with respect to the reference
point of the viewer. Examples of sine and cosine modulation are
given in Figure 24.
SINUSOIDAL
MODULATION
DC
DC
Ae
–j t
/2j
Ae
–j t
/2
Ae
–j t
/2
Ae
–j t
/2j
COSINUSOIDAL
MODULATION
Figure 24. Baseband Signal, Amplitude
Modulated with Sine and Cosine Carriers
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相關代理商/技術參數 |
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| AD9775BSVRL | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 14-bit 80-Pin TQFP EP T/R |
| AD9775BSVZ | 功能描述:IC DAC 14BIT DUAL 160MSPS 80TQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:TxDAC+® 標準包裝:1 系列:- 設置時間:4.5µs 位數:12 數據接口:串行，SPI? 轉換器數目:1 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOICN 包裝:剪切帶 (CT) 輸出數目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:* 其它名稱:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
| AD9775BSVZRL | 功能描述:IC DAC 14BIT DUAL 160MSPS 80TQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:TxDAC+® 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1,000 系列:- 設置時間:1µs 位數:8 數據接口:串行 轉換器數目:8 電壓電源:雙 ± 功率耗散（最大）:941mW 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 W 包裝:帶卷 (TR) 輸出數目和類型:8 電壓，單極 采樣率（每秒）:* |
| AD9775EB | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 160 MSPS 2X/4X/8X Interpolating Dual TxDAC+ D/A Converter |
| AD9775-EB | 制造商:Analog Devices 功能描述:EVAL BOARD - Bulk |
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