NJM2769B
HEADPHONE AMPLIFIER for CD-ROM
!
GENERAL DESCRIPTION
The
NJM2769B
is a headphone amplifier designed for 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.
!
PACKAGE OUTLINE
NJM2769BM
(DMP8)
NJM2769BRB1
MSOP8(TVSP8)
!
FEATURES
!
!
!
!
!
!
!
Operating Voltage
Operating Current
Fixed Gain
Stereo Headphone Output
Internal Mute Circuit
Bipolar Technology
Package Outline
2.8 to 5.5V
+
2mA typ. at V =5V
6dB typ.
DMP8
MSOP8(TVSP8)*
*MEET JEDEC MO-187-DA / THIN TYPE
!
PIN CONFIGURATION
PIN FUNCTION
1.OUT1
2.MUTE
3.IN1
4.GND
5.IN2
6.BIAS
7.OUT2
+
8.V
1
2
3
4
8
7
6
5
!
BLOCK DIAGRAM
8
7
6
BIAS
5
MUTE
1
2
3
4
-1-
NJM2769B
!
ABSOLUTE MAXIMUM RATINGS
(Ta=25°C)
PARAMETER
Supply Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
(note) At on PC board
SYMBOL
V
+
RATINGS
+7
(DMP8) 375
750
(note)
(MSOP8(TVSP8))320
-40 to +85
-50 to +150
UNIT
V
mW
°C
°C
P
D
Topr
Tstg
!
ELECTRICAL CHARACTERISTICS
(V
+
=5.0V,Vin=-6dBV,f=1kHz,R
L
=32Ω,Ta=25°C unless otherwise specified)
PARAMETER
SYMBOL
V
+
TEST CONDITIONS
MIN.
2.8
TYP.
5.0
2.0
2.1
6
0
50
100
0.02
-98
(12.6)
-80
80
65
-
-
MAX.
5.5
4.0
-
7
+0.5
-
-
0.1
UNIT
V
mA
V
dB
dB
mW
mW
%
Operating Voltage
Operating Current
Reference Voltage
Closed Loop Gain
Channel Balance
Output Power
I
CC
Vref
G
V
∆G
V
P
O
1
P
O
2
No Signal
No Signal
-
-
5
-0.5
R
L
=32Ω, THD=0.1%
R
L
=16Ω, THD=0.1%
30
40
-
Total Harmonic Distortion
Output Noise Voltage
Mute Attenuation
Channel Separation
Ripple Rejection Ratio
Input Voltage H-level
Input Voltage L-level
THD
Vno
ATT
CS
RR
V
IH
V
IL
Vripple=-20dBV, Rg=0Ω
Rg=0Ω, A-Weighted
Vo/Vin
-
-
65
-
2.0
0.0
dBV
-88
(39.8) (µVrms)
-70
-
-
V
+
dB
dB
dB
V
V
0.3
!
CONTROL PIN INFORMATION
PARAMETER
MUTE ON
MUTE OFF
CONTROL SIGNAL
L
H
OPERATING CONDITION
NON-SIGNAL
OUTPUT SIGNAL
-2-
NJM2769B
!
TERMINAL DESCRIPTION
PIN
NO.
SYMBOL
FUNCTION
EQUIVALENT CIRCUIT
TERMINAL
VOLTAGE
1
7
OUT1
OUT2
OUTPUT1
OUTPUT2
FB
(V -1V
BE
)/2
+
10uA
2
MUTE
MUTE CONTROL
350k
-
50k
3
5
IN1
IN2
INPUT1
INPUT2
(V -1V
BE
)/2
50k
+
BIAS
50k
6
BIAS
REFERENCE VOLTAGE
STABILIIZED CAPACITOR
CONNECT TERMINAL
50k
(V -1V
BE
)/2
+
-3-
NJM2769B
!
TYPICAL APPLICATION
100
µ
F
V
16
Ω
/32
Ω
SPEAKER
100
µ
F
+
47
µ
F
OUT2
8
7
BIAS
6
BIAS
IN2
5
V
+
2
16
Ω
/32
Ω
SPEAKER
1
OUT1
MUTE
H: SPEAKER Active
L: SPEAKER Mute
100k
Ω
1
mute
2
MUTE
1
µ
F
3
IN1
4
GND
1 F
-4-
NJM2769B
!
TYPICAL CHARACTERISTICS
Oprating Current vs. Operating Voltage
(MUTE=V+)
4
4
3.5
3
2.5
2
1.5
1
0.5
0
0
1
2
3
4
5
6
3.5
3
2.5
2
1.5
1
0.5
0
-40 -20
0
20 40 60
80 100 120
V
+
=2.8V
V
+
=5V
Operating Current vs. Ambient Temperature
Operating Current (mA)
Operating Current (mA)
Operating Voltage (V)
o
Ambient Temperature ( C)
Reference Voltage vs. Operating Voltage
3
2.5
2
1.5
1
0.5
0
0
1
2
3
4
5
6
Reference Voltage vs. Ambient Temperature
3
2.5
2
1.5
V
+
=2.8V
1
0.5
0
-40 -20
0
20 40 60
80 100 120
o
Reference Voltage (V)
Reference Voltage (V)
V
+
=5V
Operating Voltage (V)
Ambient Temperature ( C)
Power Dissipation vs. Output Power
Power Dissipation vs.Output Power
(V+=5V,f=1KHz)
(V+=5V,f=1KHz)
400
400
120
350
350
300
300
250
250
200
200
150
150
100
100
50
50
RL=16
Ω
Power Dissipation vs. Output Power
Power Dissipation vs.Output Power
(V+=2.8V,f=1KHz)
(V+=2.8V,f=1KHz)
RL=16Ω
Power Dissipation (mW)
Power Dissipation (mW)
RL=16Ω
Power Dissipation (mW)
Power Dissipation (mW)
100
80
60
60
40
40
20
20
0
0
RL=16
Ω
RL=32Ω
RL=32
Ω
RL=32
Ω
RL=32Ω
THD=10%
THD=10%
THD=10%
THD=10%
0
0
0
0
20
20
40
40
60
60
80
80
100
100
120
120
0
0
5
5
10
10
15
15
20
20
25
25
Output Power (mW)
Output Power (mW)
Output Power (mW)
Output Power (mW)
-5-
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
