AD9834 datasheet(15/20 Pages) AD

15 / 20 page

AD9834

–15–

REV PrM

PRELIMINARY TECHNICAL DATA

Figure 7. Flow Chart for AD9834 Initialisation and Operation

Figure 8. Initialisation

WAIT 7/8 MCLK

CYCLES

See Timing Diagram Fig. 2

VOUT = VREFOUT * 18 * RLOAD/RSET * (1+ (SIN(2p(FREQREG * FMCLK * t/2

28 + PHASEREG/212)))

DAC OUTPUT

DATA WRITE

SELECT DATA

SOURCES

INITIALISATION

See Figure 8 below

CHANGE PHASE?

CHANGE FREQUENCY?

CHANGE FSEL/

FSELECT?

CHANGE FREQ

CHANGE DAC OUTPUT

FROM SIN TO RAMP?

CONTROL

WRTE?

CHANGE OUTPUT AT

SIGN BIT OUT PIN?

CHANGE PSEL/

PSELECT?

CHANGE PHASE

See Figure 9

See Figure 10

YES

INITIALISATION

APPLY RESET

USING PIN

USING CONTROL

BIT

WRITE TO FREQUENCY AND PHASE REGISTERS

FREQ0 REG = FOUT0 / fMCLK * 2

FREQ1 REG = FOUT1 / fMCLK * 2

PHASE 0 & PHASE1 REG = (PhaseShift * 212) / 2p

(See Figure 9 Below)

SET RESET PIN = 1

SET RESET = 0

SELECT FREQUENCY REGISTERS

SELECT PHASE REGISTERS

USING PIN

USING CONTROL

BIT

(CONTROL REGISTER WRITE)

RESET bit = 0

FSEL = Selected Freq Register

PSEL = Selected Phase Register

PIN/SW = 0

(APPLY SIGNALS AT PINS)

RESET pin = 0

FSELECT = Selected Freq Register

PSELECT = Selected Phase Register

(CONTROL REGISTER WRITE)

RESET = 1

PIN/SW = 0

(CONTROL REGISTER WRITE)

PIN/SW = 1

AD9834 Datasheet(PDF) 15 Page - Analog Devices

AD9834 Datasheet(HTML) 15 Page - Analog Devices

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