AD9739BBCZ Analog Devices Inc, AD9739BBCZ Datasheet - Page 43

• Manufacturer Part Number: AD9739BBCZ
• Description: 14 Bit 2.5 GSPS DAC
• Manufacturer: Analog Devices Inc

Specifications of AD9739BBCZ

• Number Of Bits: 14
• Data Interface: Serial
• Number Of Converters: 1
• Voltage Supply Source: Analog and Digital
• Power Dissipation (max): 980mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 160-CSPBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Settling Time: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SYNCHRONIZATION CONTROLLER
A top level diagram of the synchronization circuitry and
controller is shown in Figure 92. The synchronization circuitry
requires a sync signal into the DAC (SYNC_IN_x) to set the
clock divider. The frequency of the SYNC_IN_x signal must be
1/4 the DACCLK_x frequency (that is, for DACCLK_x = 2.5
GSPS, the SYNC_IN_x signal must be 625 MSPS). The
SYNC_IN_x signal can be provided externally; however, it is
recommended to use the SYNC_OUT_x signal provided by the
master DAC through a fanout chip to all DACs in the system
(including the master). Using the SYNC_OUT_x signal from
the DAC allows for continuous adjustment over temperature for
SYNC_OUT_x
SYNC_IN_x
Figure 92. Top Level Block Diagram of Synchronization Circuitry and Controller
SYNC_TRACK
FF
FF
FF
FF
FF
DELAY
DELAY
SYNC_DEL
C1_DEL
C0_DEL
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0
1
3
SYNC_OUT
SO DELAY
DELAY
DELAY
CONTROLLER
proper SYNC_IN_x position. The synchronization circuitry has
two modes of operation, master and slave. In master mode, the
sync operation starts an initialization phase that determines the
proper position of the SYNC _IN_x signal by adjusting the
SYNC_ OUT_x delay line. When the SYNC_IN_x position is
locked, the master selects the correct SYNC_OUT_x phase
(and, consequently, SYNC_IN_x). After SYNC_IN_x is placed
in the center of the sampling window, and the appropriate phase
is selected, the clock divider phase is adjusted, and the master
controller enters tracking mode to maintain the SYNC_IN_x
position across temperature.
SO SELECT
DCI WINDOW SAMPLE
DCI WINDOW POST
DCI WINDOW PRE
0
2
1
3
0
2
1
3
PHASE
/4
DAC
CLOCK
AD9739