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參數(shù)資料
| 型號： | AD9772A |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 14-Bit, 160 MSPS TxDAC+ with 2x Interpolation Filter |
| 中文描述： | 14位，160 MSPS的TxDAC系列的2倍插值濾波器 |
| 文件頁數(shù)： | 12/32頁 |
| 文件大小： | 596K |
| 代理商： | AD9772A |
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REV. A
AD9772A
–12–
Referring to Figure 5, the
“
new
”
first 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
reconstruction filter is increased, thus reducing the complexity of the
analog 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
converted into a high-pass response, thus suppressing the
“
fun-
damental
”
while passing the
“
original
”
first image occurring at
f
DATA
–
f
FUNDAMENTAL
. Figure 6 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 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
that this also corresponds to 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
”
first image now occurs at f
DATA
+
f
FUNDAMENTAL
. A reduced transition region of 2
exists for image selection, thus mandating that the f
FUNDAMENTAL
be placed sufficiently high for practical filtering purposes in direct
IF applications. Also, the
“
lower sideband images
”
occurring at
f
DATA
–
f
FUNDAMENTAL
and its multiples (i.e., N
f
FUNDAMENTAL
) experience a frequency inversion while the
“
upper
sideband images
”
occurring at f
DATA
+ f
FUNDAMENTAL
and its mul-
tiples (i.e., N
f
DATA
+ f
FUNDAMENTAL
) do not.
f
FUNDAMENTAL
f
DATA
–
2
2
f
DATA
f
DATA
DAC
2
f
DATA
f
DATA
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
INPUT DATA
LATCH
2 INTERPOLATION
FILTER
DAC'S SIN (X)/X
RESPONSE
Figure 5. Time and Frequency Domain Example of Low-Pass 2
Digital Interpolation Filter
2
2
f
DATA
f
DATA
2
f
DATA
f
DATA
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
DAC
INPUT DATA
LATCH
2 INTERPOLATION
FILTER
DAC'S SIN (X)/X
RESPONSE
Figure 6. Time and Frequency Domain Example of High-Pass 2 Digital Interpolation Filter
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PDF描述 |
|---|---|
| AD9772AAST | 14-Bit, 160 MSPS TxDAC+ with 2x Interpolation Filter |
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| AD9773AST | 12-Bit, 160 MSPS 2】/4】/8】 Interpolating Dual TxDAC+ D/A Converter |
| AD9773EB | 12-Bit, 160 MSPS 2】/4】/8】 Interpolating Dual TxDAC+ D/A Converter |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD9772AAST | 制造商:Analog Devices 功能描述:DAC 1-CH Segment 14-bit 48-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:14BIT 160 MSPS TXDAC+ W/2X INTERPOLATION - Tape and Reel 制造商:Analog Devices 功能描述:Digital-Analog Converter IC Number of Bi |
| AD9772AASTRL | 制造商:Analog Devices 功能描述:DAC 1-CH Segment 14-bit 48-Pin LQFP T/R |
| AD9772AASTZ | 功能描述:IC DAC 14BIT 160MSPS 48-LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)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:50 系列:- 設置時間:4µs 位數(shù):12 數(shù)據(jù)接口:串行 轉換器數(shù)目:2 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-uMAX 包裝:管件 輸出數(shù)目和類型:2 電壓，單極 采樣率（每秒）:* 產品目錄頁面:1398 (CN2011-ZH PDF) |
| AD9772AASTZRL | 功能描述:IC DAC 14BIT 160MSPS 48LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉換器 系列:TxDAC+® 產品培訓模塊:Data Converter Fundamentals DAC Architectures 標準包裝:750 系列:- 設置時間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應商設備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
| AD9772A-EB | 制造商:Analog Devices 功能描述:14 BIT DAC W/2X INTERPOLATION 制造商:Analog Devices 功能描述:DEV TOOLS, EVAL BD FOR AD9772A - Bulk |
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