參數(shù)資料
型號(hào): AD9833BRM
廠商: ANALOG DEVICES INC
元件分類: 數(shù)字信號(hào)處理外設(shè)
英文描述: +2.5 V to +5.5 V, 25 MHz Low Power CMOS Complete DDS
中文描述: DSP-NUM CONTROLLED OSCILLATOR, PDSO10
封裝: ROHS COMPLAINT, MO-187BA, MSOP-10
文件頁(yè)數(shù): 14/18頁(yè)
文件大?。?/td> 210K
代理商: AD9833BRM
AD9833
14
REV PrG
PRELIMINARY TECHNICAL DATA
Figure 7. Initialisation
Figure 6. Flow Chart for AD9833 Initialisation and Operation
WAIT 7/8 MCLK
CYCLES
VOUT = VREF * 18 * RLOAD/RSET * (1+ (SIN(2
p
(FREQREG * FMCLK * t/228 + PHASEREG/212)))
DAC OUTPUT
DATA WRITE
See Figure 8 below
SELECT DATA
SOURCES
INITIALISATION
See Figure 7 below
CHANGE PHASE
CHANGE FREQUENCY
CHANGE
FSELECT
CHANGE FREQ
REGISTER
CHANGE DAC OUTPUT
FROM SIN TO RAMP
CONTROL
REGISTER
WRITE
(see Table 11)
CHANGE OUTPUT TO
A DIGITAL SIGNAL
CHANGE
PSELECT
CHANGE PHASE
REGISTER
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
NO
YES
INITIALISATION
APPLY RESET
WRITE TO FREQUENCY AND PHASE REGISTERS
FREQ0 REG = FOUT0 / fMCLK * 228
FREQ1 REG = FOUT1 / fMCLK * 228
PHASE 0 & PHASE1 REG = (PhaseShift * 212) / 2
p
(See Figure 8)
SET RESET = 0
SELECT FREQUENCY REGISTERS
SELECT PHASE REGISTERS
(CONTROL REGISTER WRITE)
RESET bit = 0
FSELECT = Selected Freq Register
PSELECT = Selected Phase Register
(CONTROL REGISTER WRITE)
RESET = 1
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