NJU8715

NJU8715 www.DataSheet4U.com PRELIMINARY Switching Driver with Regulator for Class-D Headphone Amplifier GENERAL DESCRIPTION The NJU8715 is a switching driver with regulator for class-D headphone amplifier. It incorporates an optimum regulator for the driver of headphone amplifier, class–D line amplifier and a beep amplifier. The NJU8715 converts 1bit digital signal of the PWM or the PDM to an analog signal output through a simple external LC low-pass filter. The NJU8715 provides a completed digital system and high power-efficiency with class-D operation. Therefore, it is suitable for portable audio applications. PACKAGE OUTLINE NJU8715KN1 FEATURES 2-channel 1bit Audio Signal Input Headphone Output Built-in Class D Line Amplifier Built-in Regulator for Driver Beep Function Logic Operating Voltage 1.9 to 2.6V (VDD) Regulator Operating Voltage 4.0 to 5.75V (VG) 1.9 to 4.0V (VREG) C-MOS Technology Package Outline QFN28 PIN CONFIGURATION 28 1 MODEB BEEPIN DIN2 DIN1 OBEEP1 VSS OUT1 CL CH VG NC OBEEP2 VSS OUT2 VDDO1 VREGO VREG VCONT VREF CFB VDDO2 VCONT ENVG ENREG EN2 EN1 VDD MCK VSS VDD VSS DIN1 Charge Pump Level Shifter Level Shifter Pre Driver Regulator VDDO1 HP Amp VREGO BLOCK DIAGRAM VREG CH VG CL VREF CFB OUT1 Pre Driver LINE Amp VSS VDDO2 MCK Level Shifter Pre Driver HP Amp OUT2 DIN2 Level Shifter Pre Driver LINE Amp VSS OBEEP1 OBEEP2 BEEPIN Level Shifter BEEP Amp BEEP Amp Control Logic Ver.2005-03-09 MODEB ENREG EN1 EN2 ENVG -1- NJU8715 www.Data...