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參數(shù)資料
| 型號(hào)： | EVAL-AD9838SDZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/32頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD9838 |
| 產(chǎn)品培訓(xùn)模塊： | Direct Digital Synthesis Tutorial Series (1 of 7): Introduction Direct Digital Synthesizer Tutorial Series (7 of 7): DDS in Action Direct Digital Synthesis Tutorial Series (3 of 7): Angle to Amplitude Converter Direct Digital Synthesis Tutorial Series (6 of 7): SINC Envelope Correction Direct Digital Synthesis Tutorial Series (4 of 7): Digital-to-Analog Converter Direct Digital Synthesis Tutorial Series (2 of 7): The Accumulator |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 計(jì)時(shí)，直接數(shù)字合成（DDS） |
| 嵌入式： | 否 |
| 已用 IC / 零件： | AD9838 |
| 主要屬性： | USB 供電或外部電源 |
| 次要屬性： | SPI 接口 |
| 已供物品： | 板，線纜，CD，文檔 |
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AD9838
Rev. A | Page 14 of 32
THEORY OF OPERATION
Sine waves are typically thought of in terms of their magnitude
form: a(t) = sin(ωt). However, sine waves are nonlinear and not
easy to generate except through piecewise construction. On the
other hand, the angular information is linear in nature; that is,
the phase angle rotates through a fixed angle for each unit of
time. The angular rate depends on the frequency of the signal
by the traditional rate of ω = 2πf.
MAGNITUDE
PHASE
+1
0
–1
228
0
2π
4π
6π
2π
4π
6π
09
07
7-
0
25
Figure 20. Sine Wave
Knowing that the phase of a sine wave is linear and given a
reference interval (clock period), the phase rotation for that
period can be determined as follows:
ΔPhase = ω
Δt
(1)
Solving for ω,
ω =
ΔPhase/Δt = 2πf
(2)
Solving for f and substituting the reference clock frequency for
the reference period (1/fMCLK = Δt),
f =
ΔPhase × fMCLK∕2π
(3)
The AD9838 builds the output based on this simple equation. A
simple DDS chip can implement this equation with three major
subcircuits: numerically controlled oscillator (NCO) plus phase
modulator, SIN ROM, and digital-to-analog converter (DAC).
Each subcircuit is described in the Circuit Description section.
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| EVAL-AD9880-ABZ | 功能描述:KIT MODULE VIDEO INPUT AD9880 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
| EVAL-ADAS1000EBZU1 | 功能描述:EVAL BOARD ADAS1000 ECG AFE RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:* 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電源管理，電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板 |
| EVAL-ADAS1000SDZ | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 EVALUATION BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| EVAL-ADAS1000SDZU3 | 制造商:Analog Devices 功能描述:EVALUATION KIT - Boxed Product (Development Kits) |
| EVAL-ADAS1000SDZU4 | 制造商:Analog Devices 功能描述:EVAL BOARD ANAS1000 ECG AFE |
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