参数资料
型号: AD9838ACPZ-RL
厂商: Analog Devices Inc
文件页数: 6/32页
文件大小: 0K
描述: IC DDS 16MHZ LOW PWR 20LFCSP
产品培训模块: 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
标准包装: 5,000
分辨率(位): 10 b
主 fclk: 5MHz
电源电压: 2.3 V ~ 5.5 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 20-WFQFN 裸露焊盘,CSP
供应商设备封装: 20-LFCSP-WQ(4x4)
包装: 带卷 (TR)
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
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.
相关PDF资料
PDF描述
AD9837BCPZ-RL IC WAVEFORM GEN PROG 10LFCSP
VE-2WM-IY-F2 CONVERTER MOD DC/DC 10V 50W
AD9837ACPZ-RL IC WAVEFORM GEN PROG 10LFCSP
VE-2W3-IY-F4 CONVERTER MOD DC/DC 24V 50W
VE-2W2-IY-F3 CONVERTER MOD DC/DC 15V 50W
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