VOUT
參數(shù)資料
型號(hào)： AD9838BCPZ-RL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 15/32頁(yè)
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(biāo)準(zhǔn)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(lèi)型： 表面貼裝
封裝/外殼： 20-WFQFN 裸露焊盤(pán)，CSP
供應(yīng)商設(shè)備封裝： 20-LFCSP-WQ（4x4）
包裝： 帶卷 (TR)
AD9838
Rev. A | Page 22 of 32
CHANGE PHASE?
CHANGE FREQUENCY?
NO
YES
NO
YES
NO
YES
DAC OUTPUT
VOUT = VREFOUT × 18 × RLOAD/RSET × (1 + (SIN(2π(FREQREG × fMCLK × t/228 + PHASEREG/212))))
INITIALIZATION
(SEE FIGURE 25)
SELECT DATA
SOURCES
(SEE FIGURE 27)
WAIT 8/9 MCLK
CYCLES
(SEE TIMING DIAGRAM
FIGURE 3)
CHANGE PSEL/
PSELECT?
CHANGE PHASE
REGISTER?
CHANGE DAC OUTPUT
FROM SIN TO TRIANGLE?
CHANGE OUTPUT AT
SIGN BIT OUT PIN?
CHANGE FSEL/
FSELECT?
CHANGE FREQUENCY
REGISTER?
CONTROL
REGISTER
WRITE
(SEE TABLE 7)
DATA WRITE
(SEE FIGURE 26)
09077-
028
Figure 24. Flowchart for AD9838 Initialization and Operation
INITIALIZATION
APPLY RESET
USING PIN
SET RESET PIN = 1
USING PINS
USING CONTROL
BIT
(CONTROL REGISTER WRITE)
RESET = 1
PIN/SW = 0
(CONTROL REGISTER WRITE)
PIN/SW = 1
USING CONTROL
BITS
SET RESET = 0
SELECT FREQUENCY REGISTERS
SELECT PHASE REGISTERS
(CONTROL REGISTER WRITE)
RESET BIT = 0
FSEL = SELECTED FREQUENCY REGISTER
PSEL = SELECTED PHASE REGISTER
PIN/SW = 0
(APPLY SIGNALS AT PINS)
RESET PIN = 0
FSELECT = SELECTED FREQUENCY REGISTER
PSELECT = SELECTED PHASE REGISTER
PIN/SW = 1
WRITE TO FREQUENCY AND PHASE REGISTERS
FREQ0 REG = fOUT0/fMCLK × 228
FREQ1 REG = fOUT1/fMCLK × 228
PHASE0 AND PHASE1 REG = (PHASESHIFT × 212)/2π
(SEE FIGURE 26)
090
77-
029
Figure 25. Flowchart for Initialization
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