參數(shù)資料
型號(hào): EVAL-AD9835EBZ
廠(chǎng)商: Analog Devices Inc
文件頁(yè)數(shù): 5/28頁(yè)
文件大小: 0K
描述: BOARD EVALUATION FOR AD9835
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)
已用 IC / 零件: AD9835
已供物品:
相關(guān)產(chǎn)品: AD9835BRUZ-REEL7-ND - IC DDS 10BIT 50MHZ 16-TSSOP
AD9835BRUZ-REEL-ND - IC DDS 10BIT 50MHZ 16-TSSOP
AD9835BRUZ-ND - IC DDS 10BIT 50MHZ 16-TSSOP
AD9835BRU-REEL7-ND - IC DDS 10BIT 50MHZ 16-TSSOP
AD9835BRU-ND - IC DDS DAC 10BIT 50MHZ 16-TSSOP
Data Sheet
AD9835
Rev. A | Page 13 of 28
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 = 2 πf.
MAGNITUDE
PHASE
+1
0
–1
2
0
09
63
0-
0
23
Figure 21. 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 by
ΔPhase = ωδt
Solving for ω,
ω = ΔPhase/δt = 2 πf
Solving for f and substituting the reference clock frequency for
the reference period (1/fMCLK = δt),
f = ΔPhase × fMCLK/2 π
The AD9835 builds the output based on this simple equation. A
simple DDS chip can implement this equation with three major
subcircuits.
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