Class D Headphone Amplifier for Digital Audio

Manufacturer's part number :


Manufacturer New Japan Radio

New Japan Radio

Description :

The NJU8721 is a class D Headphone Amplifier featuring 6th ΔΣ 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.

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  • Stereo Headphone Power Amplifier: 50mW+50mW
  • Sixth-order 32fS Over Sampling ΔΣ and 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: I2S, LSB Justified, MSB Justified
  • Operating Voltage: 3.0 to 3.6V
  • Driving Voltage: VDD to 5.25V
  • C-MOS Technology
  • Package Outline: SSOP20
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Input Signal PCM  

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Channel 2  
Operating Voltage 3 to 3.6V  
Output Power 48mW  
Standby Function Yes  
Mute Function Yes  
Attenuator Yes  
Package Outline SSOP-20