AD9958/PCB Analog Devices Inc, AD9958/PCB Datasheet - Page 30

• Manufacturer Part Number: AD9958/PCB
• Description: BOARD EVALUATION FOR AD9958
• Manufacturer: Analog Devices Inc

Specifications of AD9958/PCB

• Design Resources: Low Jitter Sampling Clock Generator for High Performance ADCs Using AD9958/9858 and AD9515 (CN0109) Phase Coherent FSK Modulator (CN0186)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

AD9958
I/O_UPDATE, SYNC_CLK, AND SYSTEM CLOCK
RELATIONSHIPS
I/O_UPDATE and SYNC_CLK are used together to transfer
data from the serial I/O buffer to the active registers in the
device. Data in the buffer is inactive.
SYNC_CLK is a rising edge active signal. It is derived from
the system clock and a divide-by-4 frequency divider. The
SYNC_CLK, which is externally provided, can be used to
synchronize external hardware to the AD9958 internal clocks.
I/O_UPDATE initiates the start of a buffer transfer. It can be
sent synchronously or asynchronously relative to the SYNC_CLK.
I/O BUFFERS
THE DEVICE REGISTERS AN I/O UPDATE AT POINT A. THE DATA IS TRANSFERRED FROM THE ASYNCHRONOUSLY LOADED I/O BUFFERS AT POINT B.
I/O_UPDATE
REGISTERS
SYNC_CLK
DATA IN
SYSCLK
DATA IN
N
N – 1
Figure 40. I/O_UPDATE Transferring Data from I/O Buffer to Active Registers
A
B
N + 1
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If the setup time between these signals is met, then constant
latency (pipeline) to the DAC output exists. For example, if
repetitive changes to phase offset via the SPI port is desired, the
latency of those changes to the DAC output is constant; otherwise,
a time uncertainty of one SYNC_CLK period is present.
The I/O_UPDATE is essentially oversampled by the SYNC_CLK.
Therefore, I/O_UPDATE must have a minimum pulse width
greater than one SYNC_CLK period.
The timing diagram shown in Figure 40 depicts when data in
the buffer is transferred to the active registers.
N
N + 2
N + 1