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參數(shù)資料
| 型號： | AD9772EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 14-Bit, 150 MSPS TxDAC⑩ with 2x Interpolation Filter |
| 中文描述： | 14位，150 MSPS的TxDAC系列⑩2倍插值濾波器 |
| 文件頁數(shù)： | 12/30頁 |
| 文件大?。?/td> | 340K |
| 代理商： | AD9772EB |
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REV. 0
AD9772
–12–
Referring to Figure 23, the “new” 1st image associated with the
DAC’s higher data rate after interpolation is “pushed” out fur-
ther relative to the input signal, since it now occurs at 2
×
f
DATA
– f
FUNDAMENTAL
. 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 reconstruc-
tion filter is increased, thus reducing the complexity of the ana-
log filter. Furthermore, the sin(x)/x roll-off over the original
input data passband (i.e., dc to f
DATA
/2) is significantly reduced.
As previously mentioned, the 2
×
interpolation filter can be con-
verted into a high pass response, thus suppressing the “funda-
mental” while passing the “original” 1st image occurring at
f
DATA
– f
FUNDAMENTAL
. Figure 24 shows the time and frequency
representation for a high pass response of a discrete time sine
wave. This action can also be modeled as a “1/2 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
2
3
INTERPOLATION FILTER
2
3
2
3
f
DATA
INPUT DATA LATCH
f
DATA
DAC
2
f
DATA
f
DATA
DAC'S SIN (X)/X
RESPONSE
1
ST
IMAGE
SUPPRESSED
1
ST
IMAGE
2
f
DATA
f
DATA
f
FUNDAMENTAL
DIGITAL
FILTER
RESPONSE
NEW
1
ST
IMAGE
2
f
DATA
f
DATA
f
FUNDAMENTAL
FREQUENCY
DOMAIN
1/2
f
DATA
1/
f
DATA
TIME
DOMAIN
Figure 23. Time and Frequency Domain Example of Low-Pass 2
×
Digital Interpolation Filter
2
3
INTERPOLATION FILTER
2
3
2
3
f
DATA
INPUT DATA LATCH
f
DATA
DAC
2
f
DATA
f
DATA
DAC'S SIN (X)/X
RESPONSE
1
ST
IMAGE
SUPPRESSED
FUNDAMENTAL
2
f
DATA
f
DATA
DIGITAL
FILTER
RESPONSE
UPPER AND
LOWER
IMAGE
2
f
DATA
f
DATA
f
FUNDAMENTAL
FREQUENCY
DOMAIN
1
/
2
f
DATA
1/
f
DATA
TIME
DOMAIN
Figure 24. Time and Frequency Domain Example of High-Pass 2
×
Digital Interpolation Filter
exactly f
DATA
/2. Since the even coefficients have a zero value
(refer to Table I), this process simplifies into inverting the cen-
ter coefficient of the low-pass filter (i.e., invert H(18)). Note,
this also corresponds into inverting the peak of the impulse
response shown in Figure 2a. The resulting high pass frequency
response becomes the frequency inverted mirror image of the
low-pass filter response shown in Figure 2b.
It is worth noting that the “new” 1st image now occurs at
f
DATA
+ f
FUNDAMENTAL
. A reduced transition region of 2
×
f
FUNDAMENTAL
exists for image selection, thus mandating that
the f
FUNDAMENTAL
be placed sufficiently high for practical filter-
ing purposes in direct IF applications. Also, the “l(fā)ower sideband
images” occurring at f
DATA
– f
FUNDAMENTAL
and its multiples
(i.e., N
×
f
DATA
– f
FUNDAMENTAL
) experience a frequency inver-
sion while the “upper sideband images” occurring at f
DATA
+
f
FUNDAMENTAL
and its multiples (i.e., N
×
f
DATA
+ f
FUNDAMENTAL
)
do not.
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PDF描述 |
|---|---|
| AD9772A | 14-Bit, 160 MSPS TxDAC+ with 2x Interpolation Filter |
| AD9772AAST | 14-Bit, 160 MSPS TxDAC+ with 2x Interpolation Filter |
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| AD9773 | 12-Bit, 160 MSPS 2】/4】/8】 Interpolating Dual TxDAC+ D/A Converter |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| AD9773BSVRL | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 12-bit 80-Pin TQFP EP T/R |
| AD9773BSVZ | 功能描述:IC DAC 12BIT DUAL 160MSPS 80TQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:TxDAC® 標準包裝:1 系列:- 設(shè)置時間:4.5µs 位數(shù):12 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)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(yīng)商設(shè)備封裝:8-SOICN 包裝:剪切帶 (CT) 輸出數(shù)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 |
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