AD9858/FDPCB Analog Devices Inc, AD9858/FDPCB Datasheet - Page 11

• Manufacturer Part Number: AD9858/FDPCB
• Description: BOARD EVAL FOR AD9858/FD
• Manufacturer: Analog Devices Inc

Specifications of AD9858/FDPCB

• Rohs Status: RoHS non-compliant
• Design Resources: Low Jitter Sampling Clock Generator for High Performance ADCs Using AD9958/9858 and AD9515 (CN0109)
• Lead Free Status / Rohs Status: Not Compliant

USING THE EVALUATION SOFTWARE WITH THE
FRACTIONAL DIVIDER BOARD
As mentioned in the Circuit Overview section, the AD9858
cannot operate at speeds greater than 1 GHz. It can accept
clocks from 1 GHz to 2 GHz, but to do so the divide-clock-by-2
function must be enabled (it is toggled on by default at power-
up and after a reset). The clock frequency must be set to the
value the user supplies as the external reference; if the value is
greater than 1 GHz and less than 2 GHz, leave the divide-by-2
box checked. To bypass the divider, clear the box and load the
information. Once the divide-by-2 function is enabled or
disabled, the user must program the Icpo currents supplied by
the charge pump. (For more information on the different output
currents supplied by the charge pump, please see the AD9858
data sheet on the DDS website www.analog.com/dds.) The next
step in programming the device is to set the frequency of the
DDS. Any or all of the four profiles can be used. Load the
frequency value into the frequency tuning word for the desired
profile, click LOAD, and then click Update.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the
human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
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ELECTRICAL CONNECTIONS
Power Plug Connections
SMB for VCO: SMB to separate 5 V.
Other Connections
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AVDD = CMOS power (3.3 V)
DVDD = CMOS power (3.3 V)
VCC = Bipolar power (3.3 V)
5 V = Charge Pump Power (5 V)
GND
External Reference (SMB from Reference Source)
RF Out(SMB to Spectrum Analyzer)
Sync Clock (if desired, SMB to external hardware)
Data port (parallel printer cable to PC’s parallel port)
AD9858FDPCB