AD9835BRU Analog Devices Inc, AD9835BRU Datasheet - Page 12

• Manufacturer Part Number: AD9835BRU
• Description: ADSP-2103KS-405V DDS DAC I.C.
• Manufacturer: Analog Devices Inc

Specifications of AD9835BRU

• Rohs Compliant: NO
• Rohs Status: RoHS non-compliant
• Resolution (bits): 10 b
• Master Fclk: 50MHz
• Tuning Word Width (bits): 32 b
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• For Use With: EVAL-AD9835EBZ - BOARD EVALUATION FOR AD9835

AD9835
SET PINS OR FREQUENCY/PHASE REGISTER WRITE
SET SYNC AND/OR SELSRC TO 1
PHASEREG<3:0> = DELTA PHASE<0, 1, 2, 3>
CONTROL REGISTER WRITE
SET FSELECT, PSEL0 AND PSEL1
INITIALIZATION*
Figure 21. Initialization
CONTROL REGISTER WRITE
FREG<0> = f
FREG<1> = f
SET SLEEP
RESET = 1
CLR = 1
WRITE INITIAL DATA
V
NO
CHANGE FSELECT
OUT
SLEEP = 0
RESET = 0
CLR = 0
OUT0
OUT1
= V
REFIN
/f
/f
CONTROL REGISTER WRITE
MCLK
MCLK
Figure 20. Flowchart for AD9835 Initialization and Operation
WAIT 6 MCLK CYCLES (8 MCLK CYCLES IF SYNC = 1)
*6.25*R
*2
*2
32
32
YES
PHASEREG <3:0> = DELTA PHASE<0, 1, 2, 3>
SELSRC = 1
SYNC = 1
OUT
AND/OR
/R
NO
NO
SELECT DATA SOURCES***
SET
FREG<0> = f
FREG<1> = f
*(1 + COS(2 (FREG*f
SET PSEL0, PSEL1
CHANGE PHASE?
CHANGE FREG?
CHANGE f
DATA WRITE**
SET FSELECT
DAC OUTPUT
OUT0
OUT1
YES
YES
NO
OUT
/f
/f
MCLK
MCLK
?
*2
*2
MCLK
32
32
YES
–12–
CHANGE PHASEREG?
*t/2
32
+ PHASEREG/2
WRITE A WORD TO ANOTHER REGISTER
DEFER REGISTER TO DATA REGISTER
WRITE PRESENT 8 BITS AND 8 BITS IN
WRITE 8 BITS TO DEFER REGISTER
YES
WRITE ANOTHER WORD TO THIS
DEFERRED TRANSFER WRITE
FSELECT/PSEL PINS BEING USED?
DIRECT TRANSFER WRITE
INITIALIZATION*
SELECT DATA SOURCES***
12
DATA WRITE**
)))
REGISTER?
Figure 23. Selecting Data Sources
NO
SET FSELECT
SET PSEL0
SET PSEL1
SET PINS
CHANGE PSEL0, PSEL1
NO
Figure 22. Data Writes
YES
SELSRC = 0
FREQUENCY/PHASE REGISTER WRITE
YES
NO
CHANGE 8 BITS ONLY
SET FSELECT
YES
SET PSEL0
SET PSEL1
SELSRC = 1
CHANGE 16 BITS
NO
REV. 0