参数资料
型号: AD9834BRU
厂商: Analog Devices Inc
文件页数: 7/32页
文件大小: 0K
描述: IC DDS W/COMP 2.3V 50MHZ 20TSSOP
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
设计资源: Amplitude Control Circuit for AD9834 Waveform Generator (CN0156)
标准包装: 75
分辨率(位): 10 b
主 fclk: 50MHz
调节字宽(位): 28 b
电源电压: 2.3 V ~ 5.5 V
工作温度: -40°C ~ 105°C
安装类型: 表面贴装
封装/外壳: 20-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 20-TSSOP
包装: 管件
Data Sheet
AD9834
THEORY OF OPERATION
Sine waves are typically thought of in terms of their magnitude
form a(t) = sin (ωt). However, these 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
2p
0
02705-
025
Figure 27. 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.
Phase = ωt
Solving for ω,
ω = Phase/t = 2πf
Solving for f and substituting the reference clock frequency for
the reference period (1/fMCLK = t),
f = Phase × fMCLK/2π
The AD9834 builds the output based on this simple equation. A
simple DDS chip can implement this equation with three major
subcircuits: numerically controlled oscillator + phase modulator,
SIN ROM, and digital-to-analog converter (DAC). Each of these
subcircuits is discussed in the Circuit Description section.
Rev. D | Page 15 of 32
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