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AD7356 Production
The AD7356 is a dual, 12-bit, high speed, low power, successive approximation ADC that operates from a single 2.5 V power supply and features throughput...
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AD7356 on Analog.com

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Using Single ended analog input in AD7356



		

			

									
					    jpdp
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on May 4, 2018 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    
 
    I'm planning to use AD7356 IC in my board design, but I need to provide single ended analog signal as the input for monitoring. As per the Data sheet and Application note related to the IC, it is suggested that I may have to include a single to differential converter as well as an OP-AMP buffer ( for Vocm input) for the single to differential interfacing. If planned so I need to add two single to differential converters and two more OP-AMP buffers - as I need to monitor two single ended analog signals. The problem is - I have space constraints in my board and incorporating these many components into it is not at all possible. Can anyone suggest any alternate method for using my single ended signal directly into that IC ( without any buffers or converters)? What if I connect my single ended input directly to the Vin+ of the IC (AD7356) and connect the Vin- pin to ground? Is there any problem if I do so? 
    
 
    Kindly suggest any methods/  measures so that I can proceed with my design.
    
 
    Thanks in advance,
    
 
    Janani.
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on May 4, 2018 5:14 AM
            
            
					
      
	
      

		
		
      
					
      Hi Janani,
      
 
      AD7356 is a differential input SAR ADC. Thus, it needs to have differential signal as input and since it is a SAR ADC, it needs to have buffer to drive the internal DAC capacitors. Based on your requirements, you need only a single or pseudo differential ADC so I would recommend AD7866. it is a dual 12-bit high speed, low power, successive approximation ADC. The part operates from a single 2.7 V to 5.25 V power supply and features throughput rates up to 1 MSPS. Similar with AD7356, it contains two ADCs. But since this is a SAR ADC, you need to have two buffer to drive the two ADCs.
      
 
      Regards,
      
 
      Daryl
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
			                            
                        
                on May 4, 2018 5:14 AM
            
            
					
      
	
      

		
		
      
					
      Hi Janani,
      
 
      AD7356 is a differential input SAR ADC. Thus, it needs to have differential signal as input and since it is a SAR ADC, it needs to have buffer to drive the internal DAC capacitors. Based on your requirements, you need only a single or pseudo differential ADC so I would recommend AD7866. it is a dual 12-bit high speed, low power, successive approximation ADC. The part operates from a single 2.7 V to 5.25 V power supply and features throughput rates up to 1 MSPS. Similar with AD7356, it contains two ADCs. But since this is a SAR ADC, you need to have two buffer to drive the two ADCs.
      
 
      Regards,
      
 
      Daryl
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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