Ground Referenced Stereo Headphone Amplifier
Description
NJU72040
Ground Referenced Stereo Headphone Amplifier
GENERAL DESCRIPTION The NJU72040 is an audio headphone amplifier .
Ground-referenced outputs eliminate output coupling
capacitor.
The pop noise suppression circuit removes a pop noise at the power-on and power-off.
It is suitable for audio headphone amplifer application
APPLICATIONS q Audio applications which have audio headphone interface
s PACKAGE OUTLINE NJU72040V
FEATURES q Operating Voltage q Operating Current
q Output Coupling Capacitor-less q Pop Noise Suppression Circuit q Gain Select q C-MOS Technology q Package Outline
+2.
7 to +3.
6V IDD=10.
5mA typ.
at V+=3.
3V, No load, No Signal
SSOP14
BLOCK DIAGRAM
inverted phase
INLINL+
V+ Reg V+ V+
INRINR+
inverted phase
32Ω Headphone
OUTL V+
Pop Noise Suppression
CP Regulator
CN
Pop Noise Suppression
OUTR
GND
Bias 3MΩ MUTE V-
32Ω Headphone
V+
GAIN 100kΩ Gain Select
REF
Ver.
1.
2E
–1–
NJU72040
PIN CONFIGURATION
INL-
1
INL+
OUTL V+
CP CN
GAIN 7
NJU72040
14 INRINR+ OUTR GND MUTE VREF
8
No.
Symbol
Function
1 INL-
Lch Inverted Input
2 INL+
Lch Noninverted Input
3 OUTL
Lch Output
4 V+
V+ Power Supply
5 CP Flying Capacitor Positive Terminal
6 CN Flying Capacitor Negative Terminal
7 GAIN
Gain Select
No.
Symbol
Function
8 REF
Reference Voltage Input
9 V-
V- Power Supply
10 MUTE MUTE / Pop Noise Suppression
11 GND
Ground
12 OUTR
Rch Output
13 INR+
Rch Inverted Input
14 INR-
Rch Noninverted Input
–2–
NJU72040
ABSOLUTE MAXIMUM RATING (Ta=25°C)
PARAMETER
SYMBOL
RATING
Supply Voltage Power Dissipation Maximum Input Voltage
V+ PD VIM
+4 SSOP14 : 550(Note1)
V+ +0.
3
Operating Temperature Range
Topr
-40 ~ +85
Storage Temperature Range
Tstg
-40 ~ +125
(Note1) EIA/JEDEC STANDARD Test board (76.
2x114.
3x1.
6mm, 2layer, FR-4) mounting
s RECOMMENDED OPERATING CONDITIONS (Ta=25°C unless otherwise specified)
PARAMETER
SYMBOL
Operating Voltage
V+
TEST CONDITION
MIN.
2.
7
UNIT V
mW V °C °C
TYP.
MAX...
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