News Release

New Product
April 09, 2020

NJR begins mass production of high performance audio volumes NJU72315 / NJU72322

New Japan Radio (NJR) launches high performance audio volumes "NJU72315 / NJU72322" that have entered mass production.

General Description

NJU72315 / NJU72322 are high performance audio volumes.
Employing external amplifiers will offer designer more flexible circuit design chance.
NJU72315 employs small package that is suitable for potable audio equipment, so achieve low operating voltage, ultra-low noise and ultra-low distortion.
NJU72322 is a product to increase productivity while following MUSES series development concept.
NJU72315 / NJU72322 are suitable for high-end audio equipment and professional audio equipment pursuing high performance and high quality sound.


    • High performance
      • NJU72315
        1. - Low operating voltage, Analog: ±3.0 to ±5.5V, Digital: +1.6 to +3.6V
        2. - Low noise / low distortion ※1
        3. - SNR 130dB with Ultra-low noise
        4. - Reduce the noise generated during volume adjustment combining zero cross detection circuit ※2 and soft step circuit ※3
        5. - Small package WCSP16 (1.9mm x 1.9mm x 0.41mm)

      • NJU72322
        1. - High dynamic range with the operating voltage up to ±18V
        2. - 0.5dB step adjustment
        3. - Low noise / low distortion ※1

  • Flexible design for sound quality
    • Conventional semiconductor volume has advantage of less variation between channels compared mechanical volume such as variable resistor. But sound quality depends on the built-in amplifiers.
      NJU72315 / NJU72322 are not conventional configuration of built-in amplifier, they need configure external amplifiers, so flexibility for sound quality design is improved. Combined with the MUSES series amplifiers, higher quality sound system can be achieved.

Fig.1 Configuration of common volume ICC
Fig.2 Configuration of volume IC with external amplifiers


Part Number NJU72315 NJU72322
Number of Channels 2 2
Built-in Amplifier No No
Operating Voltage Range
(Analog / Digital)
±3.0 to ±5.5V
+1.6V to +3.6V
±10 to ±18V
+3.0 to +5.5V
Volume 0 to -62dB
2.0dB step, Mute
0 to -111.5dB
0.5dB step, Mute
Gain※4 - +21 to 0dB
3dB step
Total Harmonic Distortion※1 0.00016% 0.00024%
Output Noise Voltage※1 -124dBV
Zero Cross Detection Circuit※2
Soft Step Circuit※3
Control Format I2C 3-wied serial control
Number of using chips on same bus line 2 2
Package WCSP16
1.9mm x 1.9mm x 0.41mm
11mm x 7.6mm
Minimum Order Quantity 3,000pcs 2,000pcs
  • ※1

    Confirm to the characteristics of the combined amplifiers. The table shows an example of low noise amplifier.

  • ※2

    Zero cross : This function reduces audible noise generated during gain adjustment changing the volume when the input signal is near GND (reference voltage)

  • ※3

    Soft step : This function reduces the zipper noise generated during gain adjustment changing the volume by smaller step.

  • ※4

    The gain can be adjusted by 0.5dB step with the volume control data.




  • High-end audio equipment
  • Professional audio equipment
  • Car audio system
  • Portable audio equipment

Production Schedule

  • NJU72315/ NJU72322 : In mass production

These contents of a release are the information as of an announcement date. Please contact us about the latest information.

Page Top