NJU72040

NJU72040 Ground Referenced Stereo Headphone Amplifier „ GENERAL DESCRIPTION The NJU72040 is an audio headphone amplifier . Ground-referenced outputs eliminate output coupling capacitor. The pop noise suppression circuit removes a pop noise at the power-on and power-off. It is suitable for audio headphone amplifer application „ APPLICATIONS q Audio applications which have audio headphone interface s PACKAGE OUTLINE NJU72040V „ FEATURES q Operating Voltage q Operating Current q Output Coupling Capacitor-less q Pop Noise Suppression Circuit q Gain Select q C-MOS Technology q Package Outline +2.7 to +3.6V IDD=10.5mA typ. at V+=3.3V, No load, No Signal SSOP14 „ BLOCK DIAGRAM inverted phase INLINL+ V+ Reg V+ V+ INRINR+ inverted phase 32Ω Headphone OUTL V+ Pop Noise Suppression CP Regulator CN Pop Noise Suppression OUTR GND Bias 3MΩ MUTE V- 32Ω Headphone V+ GAIN 100kΩ Gain Select REF Ver. 1.2E –1– NJU72040 „ PIN CONFIGURATION INL- 1 INL+ OUTL V+ CP CN GAIN 7 NJU72040 14 INRINR+ OUTR GND MUTE VREF 8 No. Symbol Function 1 INL- Lch Inverted Input 2 INL+ Lch Noninverted Input 3 OUTL Lch Output 4 V+ V+ Power Supply 5 CP Flying Capacitor Positive Terminal 6 CN Flying Capacitor Negative Terminal 7 GAIN Gain Select No. Symbol Function 8 REF Reference Voltage Input 9 V- V- Power Supply 10 MUTE MUTE / Pop Noise Suppression 11 GND Ground 12 OUTR Rch Output 13 INR+ Rch Inverted Input 14 INR- Rch Noninverted Input –2– NJU72040 „ A...