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| 型號： | AD9786BSVRL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | 16-Bit, 200 MSPS/500 MSPS TxDAC+ with 2】/4】/8】 Interpolation and Signal Processing |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 16-BIT DAC, PQFP80 |
| 封裝： | PLASTIC, MS-026-ADD, TQFP-80 |
| 文件頁數(shù)： | 33/60頁 |
| 文件大小： | 1497K |
| 代理商： | AD9786BSVRL |
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AD9786
Rev. 0 | Page 33 of 60
–8
–6
–4
–2
–0
2
4
6
8
–150
–100
–50
0
–8
–6
–4
–2
0
2
4
6
8
–150
–100
–50
0
–8
–6
–4
–2
0
2
4
6
8
–150
–100
–50
0
–8
–6
–4
–2
0
2
4
6
8
–150
–100
–50
0
NO INTERPOLATION
×4INTERPOLATION
×2INTERPOLATION
×8INTERPOLATION
SINCRESPONSE
f
SIN
f
SIN
f
SIN
f
SIN
INTERP[1] = 1
INTERP[0] = 1
INTERP[1] = 1
INTERP[0] = 0
INTERP[1] = 0
INTERP[0] = 1
INTERP[1] = 0
INTERP[0] = 0
0
Figure 57. Interpolation Modes
REAL AND COMPLEX SIGNALS
A complex signal contains both magnitude and phase
information. Given two signals at the same frequency, if a point
in time can be taken such that the signal leading in phase is
cosinusoidal and the lagging signal is sinusoidal, then
information pertaining to the magnitude and phase of a
combination of the two signals can be derived; the combination
of the two signals can be considered a complex signal. The
cosine and sine can be represented as a series of exponentials;
recalling that a multiplication by j is a counterclockwise rotation
about the Re/Im plane, the phasor representation of a complex
signal, with frequency f, can be shown in Figure 58.
Im
Re
C
Re
Im
A/2
A/2
A/2
A/2
FREQUENCY
0
+f
–f
A
2
π
ft
C = Ae
2
π
ft
= Acos(2
π
ft) + jAsin(2
π
ft)
e
+j2
π
ft
+ e
–j2
π
ft
2
e
+j2
π
ft
+ e
–j2
π
ft
2j
Acos(2
π
ft) = A
=
[
e
+j2
π
ft
+ e
–j2
π
ft
]
A
2
Asin(2
π
ft) = A
=
[
j
e
+j2
π
ft
+ e
–j2
π
ft
]
A
2
0
Figure 58. Complex Phasor Representation
The cosine term represents a signal on the real plane with
mirror symmetry about dc; this is referred to as the real, in-
phase or I component of a complex signal. The sine term
represents a signal on the imaginary plane with mirror
asymmetry about dc; this term is referred to as the imaginary,
quadrature or Q complex signal component.
The AD9786 has two channels of interpolation filters, allowing
both I and Q components to be shaped by the same filter
transfer function. The interpolation filters’ frequency response
is a real transfer function. Two DACs are required to represent a
complex signal. A single DAC can only synthesize a real signal.
When a DAC synthesizes a real signal, negative frequency
components fold onto the positive frequency axis. If the input to
the DAC is mirror symmetrical about dc, the folded negative
frequency components fold directly onto the positive frequency
components in phase producing constructive signal summation.
If the input to the DAC is not mirror symmetric about dc,
negative frequency components may not be in phase with
positive frequency components and will cause destructive signal
summation. Different applications may or may not benefit from
either type of signal summation.
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| AD9786BSVZ | 功能描述:IC DAC 16BIT INTERPOL/SP 80TQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉換器 系列:TxDAC+® 標準包裝:1 系列:- 設置時間:4.5µs 位數(shù):12 數(shù)據(jù)接口:串行，SPI? 轉換器數(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） 供應商設備封裝: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 |
| AD9786BSVZRL | 功能描述:IC DAC 16BIT INTERPOL/SP 80TQFP 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(chǎn)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(shù):8 數(shù)據(jù)接口:串行 轉換器數(shù)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(shù)目和類型:8 電壓，單極 采樣率（每秒）:* |
| AD9786-EB | 制造商:Rochester Electronics LLC 功能描述:EVAL BOARD FOR AD9786 - Bulk |
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| AD9786XSV | 制造商:Analog Devices 功能描述:- Bulk |
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