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HMC6545 Obsolete
The HMC6545 is a low power, high performance, fully programmable, dual-channel, asynchronous advanced linear equalizer that operates at data rates of up...
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HMC6545 on Analog.com

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Inquiry about HMC6545



		

			

									
					    AkiraO
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 3, 2016 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
    
 
    I received inquiry about HMC6545 from our customer.
    
 
    (1) Can we off the AGC of input side? If yes, how to do it? If now, how much input level to work the AGC?
    
 
    (2) As for the register setting of "Tap x gain sign",
    
 
         I understand that when we set this register to 1, the gain will be increase and set to 0, the gain will be decrease. Is this correct?
    
 
         Or, it just inverse the polarity of the wave form? 
    
 
    Best regards,
    
 
    Akira
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Analog Control Variable Gain Amplifiers (VGAs)
                
                                                    
                 amplifiers
                
                                                    
                 Variable Gain Amplifiers (VGA)
                
                                                    
                 HMC6545
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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        Based on a response from the ADI Tech Support folks (Kevin G and Sinan), you can drive the CAGC input to set the AGC gain, rather than just attaching a capacitor to the CAGC pin. As I understand it, the CAGC is normally driven by a current source in the IC so the external capacitor will charge up (or down) to achieve a voltage that is used to determine the AGC gain level. "Overdriving" the CAGC input with a low impedance voltage source between VCC (minimum gain) and VCC-1 (maximum gain) should allow manual adjustment of the gain of the input amplifier. (I believe the "low impedance" part is required so the internal current source does not modulate the voltage being driven into the CAGC pin.)
        
 
        I have a development board on the way and will be experimenting with this.
        
 
        SPW
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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          Based on a response from the ADI Tech Support folks (Kevin G and Sinan), you can drive the CAGC input to set the AGC gain, rather than just attaching a capacitor to the CAGC pin. As I understand it, the CAGC is normally driven by a current source in the IC so the external capacitor will charge up (or down) to achieve a voltage that is used to determine the AGC gain level. "Overdriving" the CAGC input with a low impedance voltage source between VCC (minimum gain) and VCC-1 (maximum gain) should allow manual adjustment of the gain of the input amplifier. (I believe the "low impedance" part is required so the internal current source does not modulate the voltage being driven into the CAGC pin.)
          
 
          I have a development board on the way and will be experimenting with this.
          
 
          SPW
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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