| Parameters | 
                                                                                                                        
                                                | Mfr | Analog Devices Inc. | 
                                                                                    
                                                | Series | - | 
                                                                                    
                                                | Package | Tray | 
                                                                                    
                                                | Product Status | Obsolete | 
                                                                                    
                                                | Type | Class D | 
                                                                                    
                                                | Output Type | 2-Channel (Stereo) or 4-Channel (Quad) | 
                                                                                    
                                                | Max Output Power x Channels @ Load | 40W x 1 @ 4Ohm; 20W x 2 @ 8Ohm | 
                                                                                    
                                                | Voltage - Supply | 6.5V ~ 22.5V | 
                                                                                    
                                                | Features | Depop, Mute, Short-Circuit and Thermal Protection | 
                                                                                    
                                                | Mounting Type | Surface Mount | 
                                                                                    
                                                | Supplier Device Package | 52-TQFP-EP (10x10) | 
                                                                                    
                                                | Package / Case | 52-TQFP Exposed Pad | 
                                                                                    
                                                | Base Product Number | AD1991 | 
                                                                                    
                                                | Moisture Sensitivity Level (MSL) | 3  (168 Hours) | 
                                                                                    
                                                | ECCN | EAR99 | 
                                                                                    
                                                | HTSUS | 8542.33.0001 | 
                                                                                    
                                                | Standard Package | 29 | 
                                                                                                                
                                
                             
                                                Amplifier IC 2-Channel (Stereo) or 4-Channel (Quad) Class D 52-TQFP-EP (10x10)