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Module model: ADF4351

Module type: wideband PLL frequency source

Supply voltage: DC-5v

Module current: 160mA(MAX) Static current 20mA(TYP) Normal driving current

(155mA)

Module communication protocol: SPI

Module provides routine: STM32F103RBT6 (dot frequency, sweep frequency)

Routine platform: STM32F103X-M3 (KEIL5 version source)

Module reference frequency: 100MHz (can be external input clock)

Reference frequency signal amplitude: 700mVpp(MIN)

Frequency stability: greater than 25PPM

Phase noise: each frequency point phase noise is different

Module output frequency range: 35MHz-4.4GHz

Frequency control step: 0.1MHz

Frequency sweep step time: 1ms (MIN)

Module output power: 7dBm (MAX) Different frequency output power

Module output interface: SMA (24 hours salt spray anti-oxidation)

Module output signal: sine wave or square wave

Module output channel: 2 differential channels

Module output impedance: 50 OhMs matching

Module signal characteristics: 35MHZ- - 2.2GHz square wave (fundamental wave

frequency division)

Module features: ultra-low phase noise, broadband RF PLL signal generator

Module application: RF signal frequency generator, sensor excitation source, line

loss attenuation detection, scan clock signal generator

Module specification: 50*50*7mm (length * width * height -PCB size)

Module operating temperature: 0-75℃

Module description

The ADF4351 is used in combination with an external loop filter and an external

reference frequency to implement an integer n-division PLL frequency synthesizer.

The ADF4351 features an integrated voltage-controlled oscillator (VCO) with a

fundamental output frequency range of 2200 MHz to 4400 MHzo. In addition,

using 1/2/4/8/16/32/64 frequency division circuits, users can generate RF output

frequencies as low as 35 MHz. For applications that require isolation, the RF

output stage can be muted. The mute function can be controlled either by pins or

software. It also provides auxiliary RF output and can be turned off when not in

use.

Module interface diagram

Precautions for module use

(1) The hand module is a high-precision device, in order to avoid unnecessary

interference, it is recommended to use linear power supply.

(2) Correct power supply, no reverse connection, voltage should not exceed 5.5V.

(3) The output signal is recommended to use a good conversion cable to access

the observation effect of the instrument. Poor contact or inferior wire may lead to

signal attenuation or excessive noise.

(4) If the module function needs to be simply tested, it is recommended to use it

with the control board of our shop. Power the PLL module first and then the

control board to generate waveform. Long press the middle key to switch the

function.

(5) Phase locked loop module phase noise, harmonics, power output and other

corresponding indicators

Frequently Asked Questions

ADF4351 output waveform is not sine wave, harmonics are large?

A: The ADF4351 is a digital phase-locked loop. The frequency output below 2.2G

is a frequency division output, and the output waveform is similar to a square

wave. If a sine wave is required, an external filter is required.

Q: Is the maximum frequency sweep speed of the ADF4351 only 1mS? Is the

minimum step only 0.1MHz?

A: The current loop bandwidth design and software design on the board, in order

to support 35M-4.4G frequency can be output normally, so fixed the minimum

step and the fastest sweep time, need to pursue more small steps and faster

sweep time, need to make hardware and software adjustments.

Q: PLL module, what are the two lights on the board, they did not light up after

importing the program?

A: One is the power indicator, the other is the lock indicator, and the two lights

are on to work normally. - Generally, power on the module before powering on

the main control board. When the power port on the main control board is on,

the module output is normal.