AD9739 Analog Devices, AD9739 Datasheet - Page 45
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AD9739
Manufacturer Part Number
AD9739
Description
14-Bit, 2500 MSPS, RF Digital-to-Analog Converter
Manufacturer
Analog Devices
Datasheet
1.AD9739.pdf
(48 pages)
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
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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