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| 型號： | AD9838BCPZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DDS 16MHZ LOW PWR 20LFCSP |
| 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 |
| 標準包裝： | 5,000 |
| 分辨率（位）： | 10 b |
| 主 fclk： | 16MHz |
| 電源電壓： | 2.3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-WFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 20-LFCSP-WQ（4x4） |
| 包裝： | 帶卷 (TR) |
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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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| AD9838BCPZ-RL7 | 功能描述:IC DDS 16MHZ LP 20LFCSP RoHS:是 類別:集成電路 (IC) >> 接口 - 直接數(shù)字合成 (DDS) 系列:- 產(chǎn)品變化通告:Product Discontinuance 27/Oct/2011 標準包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調(diào)節(jié)字寬（位）:32 b 電源電壓:2.97 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR) |
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| AD9840AJSTRL | 制造商:Analog Devices 功能描述:AFE Video 1ADC 10-Bit 3V 48-Pin LQFP T/R 制造商:Analog Devices 功能描述:AFE VID 1ADC 10-BIT 3.3V 48LQFP - Tape and Reel |
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