NJU7394
Pushbutton Interface EVR
GENERAL DESCRIPTION
PACKAGE OUTLINE
The NJU7394 is a pushbutton interface electronic volume.
It includes a electronic volume controller with differential input,
attenuator function, some indicator and a stand-by function
(Power-saving mode).
The NJU7394 has also built-in push button interface for its
volume UP/DOWN controls and power ON/OFF controls -
making application possible without the use of micro-controller.
The NJU7394 is suitable for low power application and also for
application without micro-controller such as mobile audio player
and cradle speaker for mobile game.
NJU7394VC3
FEATURES
• Operating Voltage
+2.7 to +5.5V
• Low operating current
2mA typ. (Active mode)
1µA typ. (stand-by mode)
• Pop-noise reduction
• Quasi-differential input
• Pushbutton interface EVR
• Adjustable initial Volume
+6 to -62dB, MUTE
-6dB, -10dB, -14dB, -18dB
• Attenuator / Soft MUTE Function -10dB, -15dB, -20dB, MUTE
• CMOS Technology
• Package Outline
SSOP20
V+
V+
Volume
indicator
BLOCK DIAGRAM
Power
indicator
Power Button
V+
V+
Bias
IREF
Power
V+
V+
SWMODE PWSW
PWIND
VOLIND
VREF GND
Power Contrel
Logic
Standby
Bias
STBY
Input L
Input G
Input R
Output L
Attenuator
Bypass/Att.
(-10dB, -15dB,
-20dB, Mute)
Electric Volume
(+6dB to -62dB, Mute)
Output R
Volume Control Logic
ATTADJ
VOLADJ
ATT
UP
DOWN TEST
V+
Attenuate level
adjuster
-10,-15,-20dB,Mute
Initial volume
adjuster
-6,-10,-14,-18 dB
RATT RINIT
Test mode
V+
Up
Down
V+
Attenuator
NJU7394 Ver.3.1 _E
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