Problem with frequency output and power level of ADF 4360 PLL

what exactly u see

khouly

we use ADF 4360-2 after a 100MHZ local oscillator. We can program the PLL we check it. However we suppose to get 2 GHZ at the output with a power level of -6-0 dbm and we can't get it. There is only a suppor around 2.2 GHZ with a low power level.
Thanks,

only a spur , not the main signal

khouly

I have used this chip, It worked as designed. I did have difficulty soldering down the leadles package on my prototype. I used a 10 MHz ref. A 100MHz ref is high, are you sure the device is getting the required ref signal strength?

Are you driving it with the GUI analog provides? I have seen a minor bug in their GUI when it programs a 4106, could set certain frequencies. I would firts try all the frequencies the chip should put out to see if this GUI alos has a bug.

Better yet, why don't you get the eval board.

C

Hi, I have problem witch adf4360-6 too. I have 26MHz reference clock. R-counter is set to 52 (I try get R-counter output on scope and 500 is there - this i right). but I have B counter set to 287 and A counter to 0 and RF out is on 3,3V still. I think, that VCO is no running.

My goals: 1100MHz on RFoutA

This is my code:

	_delay_us(2);
// send R counter latch//data[0] = 0x10; data[1] = 0x00; data [2] = 0x69;data[0] = 0x00; data[1] = 0x00; data [2] = 0xD1;ADF4360_SendSettings(data);// send control latch//data[0] = 0x00; data[1] = 0x21; data [2] = 0x24;	// LOCK
  	//data[0] = 0x00; data[1] = 0x21; data [2] = 0x84;	// R counter//data[0] = 0x00; data[1] = 0x21; data [2] = 0x44;	// N counterdata[0] = 0x0F; data[1] = 0xE1; data [2] = 0x44;	// N counter, max I

ADF4360_SendSettings(data);		_delay_ms(100);// send N counter latch//data[0] = 0x00; data[1] = 0x89; data [2] = 0x12;data[0] = 0x01; data[1] = 0x13; data [2] = 0x02;ADF4360_SendSettings(data);

Hello I have used this chip with a 10MHz reference.

Initially I had problems where it would not lock. It turned out to be that the VCO was not delivering enough power to the RF input.

Some initial things to check:
1. Does the PLL drive the Charge pump output in the correct direction when the VCO is not at the correct frequency.
2. There is a programmable test pin on this chip which will allow you to view the output from the N and R registers. This will help you determine if something is going wrong at the VCO or the XTAL reference.

If you have any large amplifiers external to the PLL circuitry, perhaps you should consider disabling them while performing these tests so they do not interfer.

How about posting your schematics

I use this circuit, interval VCO, no amplifier in loop. When i make short Vtune to ground, I am not able measure any frequency, co I think, that VCO is not running. I tryed route R counter output to test pin, so I measure correct 500kHz, but When I routed N counter output to test pi, no waveforms been there.

All I can recommend is that you
1. Go over the datasheets again.
2. Place a logic analyzer on the pins of the PLL and confirm that you are programming the thing correctly.
3. Open circuit the loop filter at the Vtune pin and connect a variable resistor. Vary the tuning voltage of the VCO. Determine if the VCO is then producing anything.