NJU8721 Datasheet | New Japan Radio

PRELIMINARY CLASS D HEADPHONE AMPLIFIER FOR DIGITAL AUDIO ! GENERAL DESCRIPTION The NJU8721 is a class D Headphone Amplifier th featuring 6 ∆Σ modulation. It includes Digital Attenuator, Mute, and De-emphasis circuits. It converts digital source input to PWM signal output which is converted to analog signal with simple external LC low-pass filter. The NJU8721 realizes very high power-efficiency by class D operation. Therefore, it is suitable for portable audio set and others. ! PACKAGE OUTLINE NJU8721V NJU8721KN1 ! Features # Stereo Headphone Power Amplifier : 50m W+50m W # Sixth-order 32f S Over Sampling ∆Σ & PWM # Internal 8f S Over Sampling Digital Filter # Sampling Frequency : 96k Hz (Max.) # De-Emphasis : 32k Hz, 44.1k Hz, 48k Hz # System Clock : 256f S # Digital Processing : Attenuator 107step, LOG Curve : Mute # Digital Audio Interface : 16bit, 18bit 2 : I S, LSB Justified, MSB Justified # Operating Voltage : 2.4 to 3.6V # Driving Voltage : VDD to 5.25V # C-MOS Technology # Package Outline : SSOP20 / QFN28 ! PIN CONFIGURATION NC TEST STBY NC VDD F0/DATA NC F1/REQ F2/SCK MUTE NC DIN LRCK BCK NC MODE RST NC VSS MCK NC QFN28 STBY TEST VSSR OUTR VDDR VDDL OUTL VSSL MODE RST 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VDD F0/DATA F1/REQ F2/SCK MUTE DIN LRCK BCK MCK VSS 28 1 VSSR OUTR VDDR NC VDDL OUTL VSSL SSOP20 Ver.2003-08-28 -1- ! BLOCK DIAGRAM VDD VSS RST MCK LRCK BCK DIN MUTE STBY MODE F0/DATA F1/REQ F2/SCK Power On Reset Circuit VDDL Synchronization Circuit Serial Audio Data Interface 8f S Over Sampling Digital Filter 32f S 6 ∆Σ & PWM th OUTL VSSL VDDR OUTR System Control VSSR -2- Ver.2003-08-28 ! TERMINAL DESCRIPTION No. QFN28 SSOP20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 - 26 27 1 2 3 5 6 7 9 10 12 13 15 16 17 19 20 21 23 24 4,8,11, 14,18,22, 25,28 SYMBOL STBY TEST VSSR OUTR VDDR VDDL OUTL VSSL MODE RST VSS MCK BCK LRCK DIN MUTE F2/SCK F1/REQ F0/DATA VDD NC I/O I I -...