Products Mentioned

AD7706 Production
The AD7705 / AD7706 are complete analog front ends for low frequency measurement applications. These 2-/3-channel devices can accept low level input signals...
Datasheet
AD7706 on Analog.com

AD7710 Production
The AD7710 is a complete analog front end for low frequency measurement applications. The device accepts low level signals directly from a strain gage...
Datasheet
AD7710 on Analog.com

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Daisy chain AD7706

		
	
				

			

									
					    drew.h
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 19, 2011 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    Is it possible to daisy chain the AD7706?  If not, can anyone recommend a 16bit ADC that can be, preferably in a DIL package?
    
 
    I have an application that requires over 50 ADCs, with 50 or 60 readings per second, so daisy chaining them would make it easy for me.  I also use the AD7710 a lot, knowing if that to can be daisy chained to would be useful.
    
			
    
			
									
		                             
                        

    
    
                                            
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                on Sep 19, 2011 10:21 AM
            
            
						
			            		
        
		
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        Thanks Rob.
        
 
        The AD977 looks like it will do the job.  With the number of ADCs on the board I'd prefer to have them in DIL sockets, so if one goes it can be replaced.  As its a one off project the age of the component is not important.  The AD7980 also looks good, but I'd have to mount them on daughter boards.  No need for an evaluation board, I'll just buy a couple from Farnell.
        
 
        The project needs to measure 64, or possibly 128, potentials at 50 or 60 readings per second, so we can filter mains noise.  The potential will be bi-polar, but conditioning for a uni-polar ADC would be possible.  Great accuracy is not needed, but I chose 16 bit because its two bytes exactly so no wasted bits.  I'll be using a dsPIC to read the ADCs and send the data to the PC.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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                on Sep 19, 2011 10:21 AM
            
            
						
			            		
          
		
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          Thanks Rob.
          
 
          The AD977 looks like it will do the job.  With the number of ADCs on the board I'd prefer to have them in DIL sockets, so if one goes it can be replaced.  As its a one off project the age of the component is not important.  The AD7980 also looks good, but I'd have to mount them on daughter boards.  No need for an evaluation board, I'll just buy a couple from Farnell.
          
 
          The project needs to measure 64, or possibly 128, potentials at 50 or 60 readings per second, so we can filter mains noise.  The potential will be bi-polar, but conditioning for a uni-polar ADC would be possible.  Great accuracy is not needed, but I chose 16 bit because its two bytes exactly so no wasted bits.  I'll be using a dsPIC to read the ADCs and send the data to the PC.
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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