Products Mentioned

ADAU7112 Recommended for New Designs
The ADAU7112 converts stereo pulse density modulation (PDM) bitstreams into one pulse code modulation (PCM) output stream. The source for the PDM data...
Datasheet
ADAU7112 on Analog.com

ADAU1772 Production
The ADAU1772 is a codec with four inputs and two outputs that incorporates a digital processing engine to perform filtering, level control, signal level...
Datasheet
ADAU1772 on Analog.com

ADAU1401A Production
The ADAU1401A is a complete, single-chip audio system with 28-/56-bit audio DSP, ADCs, DACs, and microcontroller-like control interfaces. Signal processing...
Datasheet
ADAU1401A on Analog.com

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Product Selection - PDM to Line Audio

		
	
				

			

									
					    MOpp
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 14, 2025 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user seeks to replace an analog microphone with a digital one, feeding into a DSP (TLV320AIC24IPFB) with a single-ended input. The ADAU7112 can convert PDM to I2S but lacks volume control. The ADAU1452 family (e.g., ADAU1450) is recommended as a one-chip solution with digital mic inputs, AUXADCs for volume control, and optional I2C access, providing both functionality and simplicity.
                        	    
    
                
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    Category: Hardware
    
    		        		            		    
    Product Number:  ADAU7112  
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hello,
    

    I am looking to replace an analog microphone with analog op amp through an digital one. The op amp has an potentiometer to control the gain.
    

    Sink is the DSP  TLV320AIC24IPFB, CIDI+ single ended Input. CIDI- is connected to GND.
    

    Source will be a PDM microphone.
    

    It must be able to be used as stand alone application. One time programming at manufacturing is possible. Local change of the gain on the pcb must be possible. Nice feature would be, if there is optional I2C access to the IC.
    

     
    

    My idear is to use:
    

      

    • PDM to I2S/TDM Converter ADAU7112
      • 

    • DAC, here I'm looking for help to select a fitting product, which has an input for volume control.
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    If there is a one chip solution or a complete different approach feel free to suggest. I was thinking if an ADAU1772 or ADAU1401A would be the way to go?
    

    

    Thank you, Michael
    
			
    
			
									
		                             
                        

    
    
                                            
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      •  Analog Employees  
      •  Super User  
      
            
						
                            
            
            				
            
                on Jul 14, 2025 2:36 PM
            
            
						
			            		
      
		
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      Hello Michael,
      

      I will list out some options and there are some pluses and minuses.
      

      The ADAU7112 is great to convert PDM to I2S signal but there is no volume control available with the part.
      

       The ADAU1401A or the ADAU1701 has AUX ADCs for a volume control but they do not have a digital mic input. 
      

      The ADAU1761 has a digital microphone input but no AUX ADC for volume control so you would have to do a volume control using an external controller of some sort to write to a volume control in the DSP program. 
      

      The ADUA1452 family (the ADAU1450 is the cheapest) has digital mic inputs and has AUXADCs for a volume control and it also could be controlled by another part if needed and it is VERY capable DSP core. 
      

      So those are the three option. 
      

      1) ADAU7112 feeding the signal to the ADAU1401A
      

      2) The ADAU1761 to take the mic but something else has to boot up this DSP (it cannot self boot) and that "something else" has to take care of reading a pot to send volume control info to the DSP.
      

      3) The ADAU1452 to do it all either on its own or if there is something else in the system then other fancy things could be done. 
      

      

      I vote for option 3 from a functionality and simplicity standpoint but I do not know if this fits into your product needs that you have not mentioned. You did ask for a one chip solution and this would be it. 
      

      Thanks,
      

      

      Dave T
      

      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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