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參數(shù)資料
| 型號： | AD9773EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 12-Bit, 160 MSPS 2】/4】/8】 Interpolating Dual TxDAC+ D/A Converter |
| 中文描述： | 12位，160 MSPS的2】/ 4】/ 8】TxDAC系列插雙D / A轉換 |
| 文件頁數(shù)： | 17/19頁 |
| 文件大?。?/td> | 218K |
| 代理商： | AD9773EB |
AD9773
17
PRELIMINARY TECHNICAL DATA
a(t)
b(t)
real
input output
imaginary
input output
complex filter
= (c+jd)
c
×
a(t)-d
×
b(t)
d
×
a(t)+c
×
b(t)
complex input
= (a+jb)
Figure 11. Realization of a Complex Filter
Figure 12. Implementation of Complex Modulator
Figure 13. Quadrature Modulator
ej
ω
t = cos
ω
t + jsin
ω
t
×
×
Σ
×
×
Σ
cos
ω
t
90
°
sin
ω
t
output (real)
output
(imaginary)
input (real)
input
(imaginary)
+
-
+
+
×
×
Σ
cos
ω
t
90
°
sin
ω
t
output
input (real)
input
(imaginary)
+
-
Figure 10. Identical Baseband Signals, Amplitude
Modulated with Sine and Cosine Carriers.
A more efficient method of suppressing the unwanted
image can be achieved by using a complex modulator
followed by a quadrature modulator. Figure 13 shows a
block diagram of of a quadrature modulator. Note that
it is in fact the real output half of a complex modulator.
using the architecture defined in figure 11, a system can
be realized which operates on complex signals, giving a
complex (real and imaginary) output.
The complete upconversion can actually be referred to
as two complex upconversion stages, the real output of
which becomes the transmitted signal.
The entire upconversion, from baseband to transmit
frequency, is represented graphically in figure 14. The
resulting spectrum shown in figure 14 represents the
complex data consisting of the baseband real and
imaginary channels, now modulated onto orthogonal
(cosine and negative sine) carriers at the transmit
frequency. Note that by changing the sign of the
sinusoidal multiplying term in the complex modulator,
the upper sideband image could have been suppressed
while passing the lower one.
dc
Aej
ω
t/2
Ae-j
ω
t/2
dc
Aej
ω
t/2j
Ae-j
ω
t/2j
sinusoidal
modulation
cosinusoidal
modulation
dc
A (amplitude)
baseband
signal
BW
BW
BW
BW
BW
If a complex modulation function (e
+j
ω
t
) is desired, the
real and imaginary components of the system corre-
spond to the real and imaginary components of e
+j
ω
t
, or
cos
ω
t and sin
ω
t. As Figure 12 shows, the complex
modulation function can be realized by applying these
components to the structure of the complex system
defined in Figure 11.
COMPLEX MODULATION AND IMAGE
REJECTION
In many applications, a two step upconversion is done
in which the baseband signal is modulated by one
carrier to an IF (intermediate frequency) and then mod-
ulated a second time to the transmit frequency. Although
this approach has several benefits, a major drawback is
that two images are created near the transmit frequency.
Only one image is needed, the other being an exact
duplicate. Unless the unwanted image is filtered, typi-
cally with analog components, transmit power is wasted
and the usable bandwidth available in the system is
reduced.
REV. PrA
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PDF描述 |
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| AD9774EB | 14-Bit, 32 MSPS TxDAC⑩ with 4x Interpolation Filters |
| AD9774 | 14-Bit，32 MSPS DAC with 4× Interpolation Filters(14位的，輸入數(shù)據(jù)數(shù)率為32MSPS的具有內插濾波器的D/A轉換器) |
| AD9775 | 14-Bit, 160 MSPS 2X/4X/8X Interpolating Dual TxDAC+ D/A Converter |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD9773-EB | 制造商:Analog Devices 功能描述: |
| AD9773-EBZ | 功能描述:BOARD EVALUATION AD9773 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 數(shù)模轉換器 (DAC) 系列:TxDAC® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- DAC 的數(shù)量:4 位數(shù):12 采樣率（每秒）:- 數(shù)據(jù)接口:串行，SPI? 設置時間:3µs DAC 型:電流/電壓 工作溫度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
| AD9774 | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 32 MSPS TxDAC⑩ with 4x Interpolation Filters |
| AD9774AS | 制造商:Analog Devices 功能描述:DAC 1-CH Segment 14-bit 44-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:14-BIT 32 MSPS TXDAC W/4X INTERPOLATION - Bulk 制造商:Analog Devices 功能描述:14BIT DAC CMOS SMD 9774 LQFP44 |
| AD9774ASRL | 制造商:Analog Devices 功能描述:DAC 1-CH Segment 14-bit 44-Pin MQFP T/R 制造商:Rochester Electronics LLC 功能描述:14-BIT 32 MSPS TXDAC W/4X INTERPOLATION - Bulk |
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