NJM2769B
-1 -
HEADPHONE AMPLIFIER for CD-ROM
GENERAL DESCRIPTIO N PACKA GE OUTLINE
The NJM2769B is a headphone am plifier des igned f or CD-
ROM.
It includes 6dB closed loop gain and mute circuit, requires
few external component.
The NJM2769B 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 6dB typ.
Stereo Headphone Output
Internal Mute Circuit
Bipolar Technology
Package Outline DMP8,TVSP8
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+
NJM2769BM NJM2769BRB1
PRELIMINAR
Y
NJM2769B
-2 -
ABSOLUTE MAXMUM RANG E (Ta=25°C)
PARAMETER SYMBOL RATINGS UNIT
Supply Voltage V+ +7 V
Power Dissipation PD (DMP8) 375
(TVSP8)320 mW
Operating Temperature Range Topr -40 to +85 °C
Storage Temperature Range Tstg -50 to +150 °C
ELECTRICAL CHARACTERI STICS (V+=5.0V,Vin=-6dBV,f=1kHz,RL=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 ICC No Signal - 2.0 4.0 mA
Reference Voltage Vref No Signal - 2.1 - V
Closed Loop Gain GV 5 6 7 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 - -98
(12.6) -88
(39.8) dBV
(µVrms)
Mute Attenuation ATT Vo/Vin - -80 -70 dB
Channel Separation CS 65 80 - dB
Ripple Rejection Ratio RR Vripple=-20dBV, Rg=0Ω - 65 - dB
Input Voltage H-level VIH 2.0 - V+ V
Input Voltage L-level VIL 0.0 - 0.3 V
CONTROL PI N INFORMATION
PARAMETER CONTROL SIGNAL OPERATING CONDITION
MUTE ON L NON-SIGNAL
MUTE OFF H OUTPUT SIGNAL
PRELIMINAR
Y
NJM2769B
-3 -
TYPICAL APPLICATION
16Ω/32Ω
GND
IN1
MUTE OUT1
OUT2
mute
BIAS
1
2
8 765
1 234
BIAS IN2
V+
1 F
16Ω/32Ω
SPEAKER
H: SPEAKER Active
L: SPEAKER Mute
MUTE
100μF
+
V
47μF
1μF
100kΩ
100μF
SPEAKER
PRELIMINAR
Y
[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.
