ADF4351 Third Generation High Performance Signal Generator Frequency Generator Frequency Source RF Signal Source

ADF4351 Third Generation High Performance Signal Generator Frequency Generator Frequency Source RF Signal Source

Description:
Compared to the previous generation of ADF4351 signal source, hardware improvements are the following:
- The last generation of temperature compensated crystal oscillator is made in China, the volume is large, the phase noise index is relatively poor, the volume is relatively large. The third generation version uses the United States FOX high stability temperature compensation crystal, a lot of good phase noise. In addition, the frequency stability has improved a lot, can do 0.1-0.5ppm. The price is more expensive than domestic made crystal.
- More and more users put forward requirements, the need to add an external source on the signal chip or other MCU control interface (the last generation of signal source only provide USB control interface, no other control interface). According to the needs of users, the third generation signal generator provides the standard UART serial connector, RXD, TXD, GND three lines, and open user control protocol to facilitate the user to do the two development.
- Power chip: The power converter to the PLL integrated circuit of power supply, the generation of AH33 power converter, 12V directly into 3.3V, a power converter of the output spectrum of the phase noise and spurious effects are quite big find work. The new third generation signal source to give up the AH33, switch to the Japanese TOREX power company production of XC series, the actual measurement of the ADF4351 PLL phase noise has been reduced to the theoretical limit. It is fully up to the ideal phase noise index described in the ADF4351 manual.

Compared to the previous generation of ADF4351 signal source, software optimization improvements are the following:
- Frequency stepping: The previous generation of ADF4351 frequency step is 100KHZ. Many users reflect the frequency step 100KHZ is not enough, hoping to design a smaller frequency step.
Therefore, the new third generation signal source frequency stepped up to 10KHZ resolution
In the development of this new generation of signal source, I hope to achieve the frequency step of 1KHZ, but in the end of the data, if want to very good phase noise spectrum, then the phase frequency must be high. The machine uses the 20MHZ phase detection frequency.
The conclusion is that the use of 20MHZ phase frequency, then, the minimum resolution can not be 1KHZ, weigh again and again, the third generation of ADF4351 design focus is to protect the phase noise, the frequency of the smallest step.
- Sweep function: In the work, many users want the signal source to have the sweep frequency function, the previous generation signal source is not the sweep frequency function. Therefore, in the new third generation signal source to increase the sweep function. Can scan the entire frequency range, but also can be scanned in the user specified frequency range, taking into account the scanning time problem, the current sweep resolution is 100KHZ, not 10KHZ.
- Control interface: USB control interface and TTL UART control interface, used to set the frequency and output power and sweep frequency.
- Ultra-low phase noise: (measured)
  35MHz: -120dBc at 10KHz
  100MHz: -120dBc at 10KHz
  1000MHz: -111dBc at 10KHz
  3000MHz: -102dBc at 10KHz
  4400MHz: -96.7dBc at 10KHz

Parameter:
- Output power:
  35MHZ: 19.5dBm
  100MHZ: 19.5dBm
  1000MHZ: 18dBm
  3000MHZ: 15dBm
  4400MHZ: 10dBm
- Dimensions: 99 x 60 x 16mm
- Weight: 170g

Package Included:
- 1 x Signal Generator