NJM2768B
-1-
HEADPHONE AMPLIFIER for CD-ROM
GENERAL DESCRIPTIO N
PACKAGE OUTLINE
The NJM2768B is a headphone am plifier des igned f or CD-
ROM.
It includes 0dB closed loop gain and mute circuit, requires
few external component.
The NJM2768B realizes very low turn-noise at mute mode.
It is suitable for CD-ROM, and other general audio
headphone amplifier application.
FEATURES
Operating Voltage 2.8 to 5.5V
Operating Current 2mA typ. at V
+
=5V
Fixed Gain 0dB typ.
Stereo Headphone Output
Internal Mute Circuit
Bipolar Technology
Package Outline DMP8
MSOP8(TVSP8)*
*MEET JEDEC MO-187-DA / THIN TYPE
PIN CONFIGURA TION
1
2
3
4
8
7
6
5
BLOCK DIAGRAM
1 2 3 4
8 7 6 5
BIAS
MUTE
PIN FUNCTION
1.OUT1
2.MUTE
3.IN1
4.GND
5.IN2
6.BIAS
7.OUT2
8.V
+
NJM2768BRB1
MSOP8(TVSP8)
NJM2768BM
(DMP8)
NJM2768B
-2-
ABSOL UTE MAXIMUM RATINGS
(Ta=25°C)
PARAMETER SYMBOL RATINGS UNIT
Supply Voltage V
+
+7 V
Power Dissipation P
D
(DMP8) 375
750 (note)
(MSOP8(TVSP8))320
mW
Operating Temperature Range Topr -40 to +85
°C
Storage Temperature Range Tstg -50 to +150
°C
(note) At on PC board
ELECTRICAL CHARACTERI STICS
(V
+
=5.0V,Vin=0dBV,f=1kHz,R
L
=32Ω,Ta=25°C unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
Operating Voltage V
+
2.8 5.0 5.5 V
Operating Current I
CC
No Signal - 2.0 4.0 mA
Reference Voltage Vref No Signal - 2.1 - V
Closed Loop Gain G
V
-1 0 1 dB
Channel Balance
∆G
V
-0.5 0 +0.5 dB
Output Power P
O
1
R
L
=32Ω, THD=0.1%
30 50 - mW
P
O
2
R
L
=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 V
IH
2.0 - V
+
V
Input Voltage L-level V
IL
0.0 - 0.3 V
CONTROL PI N INFORMATI O N
PARAMETER CONTROL SIGNAL OPERATING CONDITION
MUTE ON
L NON-SIGNAL
MUTE OFF
H OUTPUT SIGNAL