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NJU8721 - 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.

Key Features

  • # Stereo Headphone Power Amplifier : 50mW+50mW # Sixth-order 32fS Over Sampling ∆Σ & PWM # Internal 8fS Over Sampling Digital Filter # Sampling Frequency : 96kHz (Max. ) # De-Emphasis : 32kHz, 44.1kHz, 48kHz # System Clock : 256fS # 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 CON.

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Full PDF Text Transcription (Reference)

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NJU8721 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 : 50mW+50mW # Sixth-order 32fS Over Sampling ∆Σ & PWM # Internal 8fS Over Sampling Digital Filter # Sampling Frequency : 96kHz (Max.) # De-Emphasis : 32kHz, 44.