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.

Features

High performance

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

NJU72322
- High dynamic range with the operating voltage up to ±18V
- 0.5dB step adjustment
- 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.

 

Characteristics

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 (0.63μVrms)	-118dBV (1.26μVrms)
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	SSOP32 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)
※3Soft 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.

photos
 

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

Production Schedule
NJU72315/ NJU72322 : In mass production
Learn more about NJU72315
NJU72315 Data Sheet
Learn more about NJU72322
NJU72322 Data Sheet

Source: http://www.njr.com/