Product specifications

5007 Valon Technology LLC Data Sheet
7
should be ac coupled and between -10 and 10dBm. The external reference frequency should be an integer
multiple of 10MHz, such as 10, 20, 50, 100, or 150MHz. A 5MHz external reference frequency can be used
by enabling the reference doubler function with the Configuration Manager software.
Both synthesizers will operate either in the fractional-N or integer-N mode depending on the user selected
frequency. Since the internal phase-frequency detectors and loop filters are set operate at 10MHz, the
synthesizers will be operating in the factional-N mode whenever a channel frequency is selected that is not
an integer multiple of 10MHz. The Configuration Manager allows the user to set the frequency increment
to channel spacing as small as 5kHz in the divide-by-1 range with the reference doubler on. The frequency
increment will be smaller by the divide-by factor on lower frequencies. In order to minimize phase noise
and spurs its best to use the largest possible frequency increment setting that will provide the desired
output frequency.
The Configuration Manager software along with the serial adapter allows the user to set the desired output
frequency and channel spacing directly. The Configuration Manager can also store any offset frequency and
sign. This allows direct entry of the desired frequency if the synthesizer is used as a local oscillator in a
heterodyne system. For example, if the synthesizer is used as the first LO in a high-side receiver with a
160MHz IF and 1045MHz is the desired tuned frequency, then the user would simply set the desired