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參數(shù)資料
| 型號： | AD9772A-EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/40頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD9772A |
| 產(chǎn)品培訓(xùn)模塊： | DAC Architectures |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | TxDAC+® |
| DAC 的數(shù)量： | 1 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 160M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 設(shè)置時間： | 11ns |
| DAC 型： | 電流 |
| 工作溫度： | -40°C ~ 85°C |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD9772A |
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AD9772A
Rev. C | Page 18 of 40
In many band-limited applications, the images from the
reconstruction process must be suppressed by an analog filter
following the DAC. The complexity of this analog filter is typically
determined by the proximity of the desired fundamental to the
first image and the required amount of image suppression.
Adding to the complexity of this analog filter is the requirement
of compensating for the sin(x)/x response of the DAC.
Referring to Figure 27, the new first image associated with the
higher data rate of the DAC after interpolation is pushed out
further relative to the input signal, because it now occurs at 2×
fDATA fFUNDAMENTAL. The old first image associated with the
lower DAC data rate before interpolation is suppressed by the
digital filter. As a result, the transition band for the analog
reconstruction filter is increased, thus reducing the complexity
of the analog filter. Furthermore, the value of the sin(x)/x roll-
off divided by the original input data pass band (that is, dc to
fDATA/2) is significantly reduced.
As previously mentioned, the 2× interpolation filter can be
converted into a high-pass response, thus suppressing the fun-
damental while passing the original first image occurring at
representation for a high-pass response of a discrete time sine
wave. This action can also be modeled as a half-wave digital
mixing process in which the impulse response of the low-pass
filter is digitally mixed with a square wave having a frequency of
exactly fDATA/2. Because the even coefficients have an integer
value of 0 (see Table 5), this process simplifies into inverting the
center coefficient of the low-pass filter (that is, inverting H(18)).
Note that this also corresponds to inverting the peak of the
impulse response shown in Figure 4. The resulting high-pass
frequency response becomes the frequency inverted mirror
image of the low-pass filter response shown in Figure 5.
Note that the new first image occurs at fDATA + fFUNDAMENTAL. A
reduced transition region of 2 × fFUNDAMENTAL exists for image
selection, thus mandating that the fFUNDAMENTAL be placed
sufficiently high for practical filtering purposes in direct IF
applications. In addition, the lower sideband images occurring
at fDATA fFUNDAMENTAL and its multiples (that is, N × fDATA
fFUNDAMENTAL) experience a frequency inversion while the upper
sideband images occurring at fDATA + fFUNDAMENTAL and its multiples
(that is, N × fDATA + fFUNDAMENTAL) do not.
2×
DAC
2 ×
fDATA
FIRST IMAGE
SUPPRESSED
FIRST IMAGE
2 ×
fDATA
DIGITAL
FILTER
RESPONSE
NEW
FIRST IMAGE
2 ×
fDATA
fFUNDAMENTAL
FREQUENCY
DOMAIN
1/ 2 ×
fDATA
1/
fDATA
TIME
DOMAIN
INPUT DATA
LATCH
2× INTERPOLATION
FILTER
DAC SIN(x)/x
RESPONSE
2 ×
fDATA
02
25
3-
0
27
Figure 27. Time and Frequency Domain Example of Low-Pass 2× Digital Interpolation Filter
fFUNDAMENTAL
FREQUENCY
DOMAIN
TIME
DOMAIN
2×
DAC
2 ×
fDATA
FIRST IMAGE
SUPPRESSED
fFUNDAMENTAL
2 ×
fDATA
DIGITAL
FILTER
RESPONSE
UPPER AND
LOWER IMAGE
2 ×
fDATA
1/2 ×
fDATA
1/
fDATA
INPUT DATA
LATCH
2× INTERPOLATION
FILTER
DAC SIN(x)/x
RESPONSE
2 ×
fDATA
022
53
-028
Figure 28. Time and Frequency Domain Example of High-Pass 2× Digital Interpolation Filter
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9772AST | 制造商:Rochester Electronics LLC 功能描述:14 BIT DAC W/2X INTERPOLA - Tape and Reel |
| AD9772EB | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 160 MSPS TxDAC+ with 2x Interpolation Filter |
| AD9773 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Analog Devices: Data Converters: DAC 12-Bit, 10 ns to 100 ns Converters Selection Table |
| AD9773AST | 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Bit, 160 MSPS 2】/4】/8】 Interpolating Dual TxDAC+ D/A Converter |
| AD9773BSV | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 12-bit 80-Pin TQFP EP 制造商:Rochester Electronics LLC 功能描述:12BIT 160 MSPS DUAL TXDAC+ D/A CONVERTER - Bulk 制造商:Analog Devices 功能描述:IC 12-BIT DAC |
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