AD9520-1/PCBZ Analog Devices Inc, AD9520-1/PCBZ Datasheet - Page 11

• Manufacturer Part Number: AD9520-1/PCBZ
• Description: BOARD EVAL FOR AD9520-1
• Manufacturer: Analog Devices Inc

Specifications of AD9520-1/PCBZ

• Design Resources: Synchronizing Multiple AD9910 1 GSPS Direct Digital Synthesizers (CN0121) Phase Coherent FSK Modulator (CN0186)
• Main Purpose: Timing, Clock Generator
• Embedded: No
• Utilized Ic / Part: AD9520-1
• Primary Attributes: 12 LVPECL/24 CMOS Output Clock Generator with 2.5 GHz VCO
• Secondary Attributes: SPI and I2C Compatible Control Port
• Silicon Manufacturer: Analog Devices
• Application Sub Type: PLL Clock Synthesizer
• Kit Application Type: Clock & Timing
• Silicon Core Number: AD9520-0, AD9520-2, AD9520-2
• Silicon Family Name: AD9520-X
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Evaluation Board User Guide
CHARGE PUMP SETUP WINDOW
The Charge Pump Setup window shown in Figure 17 is
accessed by clicking the CHARGE PUMP box on the main
window.
This window is most often used to vary the charge pump
current.
The window also has a check box for setting the charge pump
voltage to V
isolating the output driver section of the AD9520 from the PLL
section.
ZERO DELAY WINDOW
The Zero Delay window shown in Figure 18 is accessed by
clicking the ZERO DELAY box on the main window.
When internal zero delay mode is selected, the window shrinks
because only Divider 0 can operate in the internal zero delay mode.
CP
/2, which is very useful for debugging the PLL and
Figure 17. Charge Pump Setup Window
Figure 18. Zero Delay Window
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VCO CALIBRATION WINDOW
The Calibrate VCO window shown in Figure 19 is accessed by
clicking the Cal VCO button on the main window.
A valid reference input signal must be present to complete
VCO calibration, and the VCO must be recalibrated any time
the VCO frequency changes by more than 40 MHz.
A VCO divider of 16 is suitable for all applications. However,
for applications where the phase detector frequency is <12 MHz,
using a smaller VCO calibration divider reduces calibration
time. Refer to the AD9520 data sheet for more details.
CHANNEL DIVIDER WINDOW
The channel divider window shown in Figure 20 is accessed by
clicking the appropriate channel divider. It is usually sufficient
to change only the divide ratio because the evaluation software
and the AD9520 duty cycle correction feature ensure that the
output duty cycle remains very close to 50%.
You can also vary the phase offset by changing the Phase Offset
Bits setting. However, for the new phase to take effect, the SYNC
signal must be toggled via the SYNC button in the lower left
corner of the main window.
Figure 20. Channel Divider Window
Figure 19. Calibrate VCO Window
UG-076