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j NJM2768
HAEDPHONE AMPLIFIER for CD-ROM
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■ GENERAL DESCRPTION ■ PACKAGE OUTLENE
The NJM2768 is a headphone amplifier designed for CD-
ROM.
It includes 0dB closed loop gain and mute circuit
which require few external component.
The
NJM2768 realizes very low turn-noise at mute mode.
It is suitable for CD-ROM , and other general audio
headphone amplifier application.
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■ FEATURES
●Operating Voltage 4.5-5.5V
●Operating Current 2mA typ., at V+=5V
●Fixed Gain 0dB typ.
●Stereo Headphone Output
●Internal Mute Circuit
●Bipolar Technology
●Package Outline DMP8
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■ PIN CONFIGURA TION
1
2
3
4
8
7
6
5
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■ BLOCK DIAGRAM
1234
8765
BIAS
MUTE
PIN FUNCTION
1.OUT1
2.MUTE
3.IN1
4.GND
5.IN2
6.BIAS
7.OUT2
8.V+
NJM2768M
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■ ABSOLUTE MAXMUM RANG E (Ta=25°C)
PARAMETER SYMBOL RATINGS UNIT
Supply Voltage V+ +7 V
Power Dissipation PD (DMP8) 375
750 (note) mW
Operating Temperature Range Topr -40 to +85 °C
Storage Temperature Range Tstg -50 to +150 °C
(note)At on PC board
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■ ELECTRICAL CHARACTERI STICS (V+=5.0V,Vin=0dBV,f=1kHz,RL=32Ω,Ta=25°C unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
Operating Voltage V+ 4.5 5.0 5.5 V
Operating Current ICC No Signal - 2.0 4.0 mA
Reference Voltage Vref No Signal - 2.1 - V
Closed Loop Gain GV -1 0 1 dB
Channel Balance ∆GV -0.5 0 +0.5 dB
Output Power PO1 RL=32Ω, THD=0.1% 30 50 - mW
P
O2 RL=16Ω, THD=0.1% 40 100 - mW
Total Harmonic Distortion THD - 0.02 0.1 %
Output Noise Voltage Vno Rg=0Ω, A-Weighted - -104
(6.3) -94
(20) dBV
(µVrms)
Mute Attenuation ATT Vo/Vin - -80 -70 dB
Channel Separation CS 90 110 - dB
Ripple Rejection Ratio RR Vripple=-20dBV, Rg=0Ω - 70 - dB
Input Voltage H-level VIH 2.0 - V+ V
Input Voltage L-level VIL 0.0 - 0.3 V
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■ COMTROL PIN INFOMETION
PARAMETER CONTROL SIGNAL OPERATING CONDITION
MUTE ON L NON-SIGNAL
MUTE OFF H OUTPUT SIGNAL
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■ TYPICAL APPLICA TION
GND
IN1
MUTEOUT1
OUT2
mute
BIAS
1
2
8765
1234
BIAS IN2
V+
1F
16Ω
ΩΩ
Ω/32Ω
ΩΩ
Ω
SPEAKER
SPEAKER
H:SPEAKER A ctive
L: SPEAKER Mute
MUTE
100uF
V+
47uF
1uF
100kΩ
ΩΩ
Ω
100uF
16Ω
ΩΩ
Ω/32Ω
ΩΩ
Ω
MEMO
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
