AD9739 Analog Devices, AD9739 Datasheet - Page 45

• Manufacturer Part Number: AD9739
• Description: 14-Bit, 2500 MSPS, RF Digital-to-Analog Converter
• Manufacturer: Analog Devices

Specifications of AD9739

• Resolution (bits): 14bit
• Dac Update Rate: 2.5GSPS
• Dac Settling Time: n/a
• Max Pos Supply (v): +3.5V
• Single-supply: Yes
• Dac Type: Current Out
• Dac Input Format: LVDS,Par

Data Sheet
RECOMMENDED START-UP SEQUENCE
Upon power-up of the AD9739, a host processor is required
to initialize and configure the
shows a flowchart of the sequential steps required, while Table 31
and Table 32 provides more detail on the SPI register write/read
operations required to implement the flowchart steps. Note the
following:
•
•
A software reset is optional because the
an internal POR circuit and a RESET pin.
The SYNC controller is optional because it is only required
to synchronize two or more devices. If synchronization is
required, validate that DCI_DEL values between devices
are sufficiently matched.
CONFIGURE
SOFTWARE
INPUT CMV
SPI PORT
SET CLK
RESET
AD9739
CONFIGURE
FEW 100µs
MU CONT.
MU CONT.
LOCKED?
WAIT A
YES
via its SPI port. Figure 75
Figure 75. Flowchart for Initialization and Configuration of the
AD9739
NO
has both
SYNC CONT.
FEW 100µs
CONFIGURE
WAIT A
VALID?
CONT.
SYNC
Rev. B | Page 45 of 48
YES
NO
•
•
•
•
The mu controller must be first enabled (and in track mode)
before the data receiver controller is enabled because the
DCO output signal is derived from this circuitry.
A wait period is related to f
Limit the number of attempts to lock the controllers to
three; locks typically occur on the first attempt.
Hardware or software interrupts can be used to monitor
the status of the controllers.
CONFIGURE
FEW 100µs
DATA CONT.
LOCKED?
Rx DATA
WAIT A
CONT.
Rx
YES
AD9739
NO
DEFAULT SETTING
RECONFIGURE
TxDAC FROM
OPTIONAL
COMPARE
DCI_DEL
VALUES
DATA
periods.
SYNC.
ONLY
AD9739