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ADN8810 oscillation problem



		

			

									
						Seregga
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on May 31, 2018 
				
			
			
		


				
		

		    		    
		    
		    	
			
Hi.

 
Please help me.

 
I try to develop laser diode driver using ADN8810.

 
I assembled electrical scheme according datasheet page 12 fig.20

 

 
But I have oscillation about 11MHz on the Iout pin(9). If I remove FET transistor - there is no oscillation on the Iout. 

 
I try to change FET - it doesn't help. Now I use 2sk2009F.

 
SPI connection looks good, if I change sending value by SPI - Iout RMS value is changing.

 
This is pictures Iout from oscilloscope

 

 
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Please help me, because I don't know where is problem. If you need additional information, please ask.

 
___________________________________

 
Best regards

 
Sergei G