NJM2777
– 1 –
Headphone Amplifier with Electronic Volume
■
■■
■ GENERAL DESCRIPTION
NJM2777 is a headphone amplifier with electronic volume. It
includes widely gain adjustable volume, +20 to –80 dB, and mute
function. These are controlled by DC voltage. The NJM2777 is
suitable for headphone output on TV set.
■
■■
■ FEATURES
● Operating Voltage 8 to 10 V
● Electronic Volume +20dB to -80dB
● Mute Function
● Bipolar
● Package Outline DIP14, DMP14, SSOP14
■
■■
■ BLOCK DIAGRAM
■
■■
■ PIN FUNCTION
■
■■
■PACKAGE OUTLINE
VOL
IN b
IN a
VOL
Vref
V+ GND
OUTa
OUTb
CNTb
CNTa
Mute
Bias
Mute
CAPa
CAPb
1
7 8
14
No. SYMBOL FUNCTION No.
SYMBOL FUNCTION
1 V+ Power Supply 8 N.C. No connecting
2 OUTb Bch Output
9 Vref Reference voltage stabilized
capacitor connect terminal
3 CNTb Bch Volume control voltage
input
10 INa Ach Input
4 CAPb Bch Volume control click
noise absorbing capacitor
connect terminal
11 CAPa Ach Volume control click
noise absorbing capacitor
connect terminal
5 INb Bch Input
12 CNTa Ach Volume control voltage
input
6 Mute Mute control 13 OUTa Ach Output
7 N.C. No connecting 14 GND Ground
NJM2777D NJM2777M NJM2777V
NJM2777
– 2 –
■
■■
■ ABSOLUTE MAXIMUM RATING (Ta=25°
°°
°C)
PARAMETER SYMBOL RATING UNIT
Supply Voltage V+ 12 V
Power Dissipation PD
DIP14 : 500
DMP14 : 500*
SSOP14 : 440*
mW
Operating Temperature Range Topr -20 to +75 °C
Storage Temperature Range Tstg -40 to +125 °C
*(Note) EIA/JEDEC STANDARD Test board(76.2 x 114.3 x 1.6mm, 2layers, FR-4)mounting
■
■■
■ ELECTRICAL CHARACTERISTICS
(V+=9V, VIN=-20dBV, f=1kHz, RL=100Ω, Gv=0dB,”Mute” terminal =L, Ta=25°C)
●
●●
●POWER SUPPLY
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Operating Voltage V+ 8 9 10 V
Operating Current ICC No Signal - 5 8 mA
Reference Voltage VREF 4 4.1 4.2 V
●
●●
●AMPLIFIER
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Volume Operating Range GEVR VCNTa, VCNTb = 0 to 3.3V 80 100 - dB
Voltage Gain Channel Balance ∆Gv -1.5 0 1.5 dB
Maximum Input Voltage VIM Gv=-10dB
THD=3%
8.9
(2.8)
9.5
(3.0) - dBV
(Vrms)
Output Power PO Gv=10dB, THD=10% 70 100 - mW
Total Harmonic Distortion THD - 0.1 1 %
Channel Separation CS Rg=600Ω, Vin = 0dBV 70 80 - dB
Mute Level Mute “Mute” terminal=H,
Vin = 0dBV - -85 -75 dB
Output Noise Voltage 1 VNO1 Rg=0Ω, A-Weighted - -95
(18)
-85
(56)
dBV
(µVrms)
Output Noise Voltage 2 VNO2 “Mute” terminal =H
Rg=0Ω, A-Weighted - -105
(5.6)
-95
(18)
dBV
(µVrms)
Power Supply Ripple Rejection PSRR Vripple=-20dBV
Rg=0Ω - 70 - dB
●
●●
●CONTROL
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
High Level Input Voltage VIH 2 - V+ V
Low Level Input Voltage VIL 0 - 0.4 V
■
■■
■ CONTROL TERMINAL
Control Terminal
Operating Condition Mute Terminal Description
Mute H Mute the signal
Operating
Condition
Active L, OPEN Output the signal
NJM2777
– 3 –
■
■■
■ TEST CIRCUIT
TEST CIRCUIT1 (THD, GEVR, VIM, PO)
Volume Range : GEVR=min
max
log20 Vo
Vo
Vomin : Output voltage at VCNT=0V
Vomax : Output voltage at VCNT=3.3V
0.47µF
10µF 100µF
Input A
Output A
CNT A
Input B Output BCNT B
10µF
0.47µF 100µF
1µF
1µF
100Ω
VCNTB
100Ω
VCNTA
V+
[THD] BPF:400 to 30KHz
[GEVR] BPF:1KHz
[THD] BPF:400 to 30KHz
[GEVR] BPF:1KHz
VOL
7
CAPb
6
Mute
5
INb
4
CNTb
3
OUTb
2
N.C.
1
V+
8
CAPa
9
Vref
10
INa
11
CNTa
12
OUTa
13
N.C.
14
GND
VOL
Bias
NJM2777
– 4 –
TEST CIRCUIT 2 (VNO1,VNO2,VREF)
0.47µF
10µF
100µF
Input A
Output A
CNT A
Input B Output B CNT B
10µF
0.47µF 100µF
1µF
1µF
100Ω
VCNTB
100Ω
VCNTA
V+
[VNO1, VNO2]
A
-Weighted
[VNO, VNO2]
A
-Weighted
[VREF]
VOL
7
CAPb
6
Mute
5
INb
4
CNTb
3
OUTb
2
N.C.
1
V+
8
CAPa
9
Vref
10
INa
11
CNTa
12
OUTa
13
N.C.
14
GND
VOL
Bias
NJM2777
– 5 –
TEST CIRCUIT 3 (Icc)
0.47µF
10µF
100µF
Input A
Output A
CNT A
Input B Output B CNT B
10µF
0.47µF
100µF
1µF
1µF
100Ω
VCNTB
Rg=600Ω
100Ω
VCNTA
Rg=600Ω
V+
[Icc]
VOL
7
CAPb
6
Mute
5
INb
4
CNTb
3
OUTb
2
N.C.
1
V+
8
CAPa
9
Vref
10
INa
11
CNTa
12
OUTa
13
N.C.
14
GND
VOL
Bias
NJM2777
– 6 –
TEST CIRCUIT 4 (CS)
0.47µF
10µF
100µF
Input A
Output A
CNT A
Input B
CNT B
10µF
0.47µF
100µF
1µF
1µF
100Ω
VCNTB
100Ω
VCNTA
Rg=600Ω
[CS]
BPF:1KHz
[CS]
BPF:1KHz
Rg=600Ω
Rg=600Ω
VOL
7
CAPb
6
Mute
5
INb
4
CNTb
3
OUTb
2
N.C.
1
V+
8
CAPa
9
Vref
10
INa
11
CNTa
12
OUTa
13
N.C.
14
GND
VOL
Bias
NJM2777
– 7 –
TEST CIRCUIT 5 (PSRR)
0.47µF
10µF
100µF
Input A
Output A
CNT A
Input B Output B CNT B
10µF
0.47µF
100µF
1µF
1µF
100Ω[PSRR]
BPF:1KHz
VCNTB
Rg=0Ω
100Ω[PSRR]
BPF:1KHz
VCNTA Rg=0Ω
V+
VOL
7
CAPb
6
Mute
5
INb
4
CNTb
3
OUTb
2
N.C.
1
V+
8
CAPa
9
Vref
10
INa
11
CNTa
12
OUTa
13
N.C.
14
GND
VOL
Bias
NJM2777
– 8 –
TEST CIRCUIT 6 (MUTE)
0.47µF
10µF
100µF
Input A
Output A
CNT A
Input B Output B CNT B
10µF
0.47µF 100µF
1µF
1µF
100Ω
VCNTB
100Ω
V+
VOL
7
CAPb
6
Mute
5
INb
4
CNTb
3
OUTb
2
N.C.
1
V+
8
CAPa
9
Vref
10
INa
11
CNTa
12
OUTa
13
N.C.
14
GND
VOL
Bias
[MUTE]
BPF:1KHz
[MUTE]
BPF:1KHz
NJM2777
– 9 –
■
■■
■ APPLICATION CIRCUIT
0.47µF
10µF
100µF
Input A
Output A
CNT A
Input B
Output B
CNT B
10µF
1µF
0.47µF 100µF
100kΩ
1µF
1µF
75Ω
75Ω
VOL
7
CAPb
6
Mute
5
INb
4
CNTb
3
OUTb
2
N.C.
1
V+
8
CAPa
9
Vref
10
INa
11
CNTa
12
OUTa
13
N.C.
14
GND
VOL
Bias
NJM2777
– 10 –
■
■■
■ TERMINAL DESCRIPTION
PIN
NO. SYMBOL FUNCTION EQUIVALENT CIRCUIT TERMINAL
VOLTAGE
2
13
OUTb
OUTa
Bch Output
Ach Output
V+/2
3
12
CNTb
CNTa
Bch Volume Control
Ach Volume Control
-
4
11
CAPb
CAPa
Bch Volume control click
noise absorbing capacitor
connect terminal
Ach Volume control click
noise absorbing capacitor
connect terminal
-
5
10
INb
INa
Bch Input
Ach Input
GND
18k
1k
200
25p
2.2
OUT
IN 200
50k
200 42k
42k
CNT
CAP
200 42k
42k
CNT
CAP
NJM2777
– 11 –
■
■■
■ TERMINAL DESCRIPTION
PIN
NO. SYMBOL FUNCTION EQUIVALENT CIRCUIT TERMINAL
VOLTAGE
6
Mute
Mute Control
GND
9
Vref
Reference voltage stabilized
capacitor connect terminal
V+/2
400k
200
Mute
Vref
100k
100k
200
NJM2777
– 12 –
■
■■
■ TYPICAL CHARACTERISTICS
Operating Current vs. Operating Voltage
No signal, MUTE=L, Ta=25°C
0
1
2
3
4
5
6
7
8
4 6 8 10 12 14
Operating Voltage [V]
Operating Current [mA]
Operating Current vs. Ambient Temperature
V+=9V, No signal, MUTE=L
0
1
2
3
4
5
6
7
8
-50 0 50 100 150
Ambient Temperature [°C]
Operating Current [mA]
Reference Voltage vs. Operating Voltage
No signal, MUTE=L, Ta=25°C
2
3
4
5
6
7
4 6 8 101214
Operating Voltage [V]
Reference Voltage [V]
Reference Voltage vs. Ambient Temperature
V+=9V, No signal, MUTE=L
2
3
4
5
6
7
-50 0 50 100 150
Ambient Temperature [°C]
Reference Voltage [V]
Voltage Gain vs. Control Voltage (Operating Voltage)
Vin=-20dBV, f=1kHz, RL=100Ω, Ta=25°C
-100
-80
-60
-40
-20
0
20
40
0.0 0.5 1.0 1.5 2.0 2.5 3.0
VCNT [V]
Voltaqge Gain [dB]
V+=8V, 9V, 10V
Voltage Gain vs. Control Voltage (Frequency)
V+=9V, Vin=-20dBV, RL=100Ω, Ta=25°C
-100
-80
-60
-40
-20
0
20
40
0.0 0.5 1.0 1.5 2.0 2.5 3.0
VCNT [V]
Voltage Gain[dB]
f=100Hz, 1kHz, 10kHz
NJM2777
– 13 –
■
■■
■ TYPICAL CHARACTERISTICS
Voltage Gain vs. Control Voltage (Ambient Temperature)
V+=9V, Vin=-20dBV, f=1kHz, RL=100Ω
-100
-80
-60
-40
-20
0
20
40
0.0 0.5 1.0 1.5 2.0 2.5 3.0
VCNT [V]
Voltage Gain [dB]
-20°C
25°C
75°C
Mute Level vs. Mute Control Voltage
V+=9V, Vin=0dBV, f=1kHz, Gv=0dB, RL=100Ω
-100
-80
-60
-40
-20
0
20
0.0 1.0 2.0 3.0 4.0
Mute Control Voltage [V]
Mute Level [dB]
Ta=-20°C
Ta=75°C
Ta=25°C
Mute Level vs. Frequency
V+=9V, Vin=0dBV, Gv=0dB, RL=100Ω, MUTE=H, Ta=25°C
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1000 10000 100000
Frequency [Hz]
Mute Level [dB]
Mute Level vs. AMbient Temperature
V+=9V, Vin=0dBV, f=1kHz, Gv=0dB, RL=100Ω, MUTE=H
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-50 0 50 100 150
Ambient Temperature [°C]
Mute Level [dB]
Voltage Gain Channel Balance vs. Control Voltage (Frequency)
V+=9V, Vin=-20dBV, RL=100Ω, Ta=25°C
-1.5
-1
-0.5
0
0.5
1
1.5
0.0 0.5 1.0 1.5 2.0 2.5 3.0
VCNT [V]
Voltage Gain Channel Balance [dB]
f=10kHz
100Hz
f=1kHz
Voltage Gain Channel Balance vs. Control Voltage (Ambient Temperature)
V+=9V, Vin=-20dBV, f=1kHz, RL=100Ω
-1.5
-1
-0.5
0
0.5
1
1.5
0.00.51.01.52.02.53.0
VCNT [V]
Voltage Gain Channel Balance [dB]
75°C
25°C
-20°C
NJM2777
– 14 –
■
■■
■ TYPICAL CHARACTERISTICS
THD+N vs. Output Power (Operating Voltage)
f=1kHz, Gv=10dB, RL=100Ω, BW=400Hz-30kHz, Ta=25°C
0.01
0.1
1
10
100
1E-6 10E-6 100E-6 1E-3 10E-3 100E-3 1E+0
Output Power [W]
THD+N [%]
V+=10V
V+=9V
V+=8V
THD+N vs. Output Power (Frequency)
V+=9V, Gv=10dB, RL=100Ω, Ta=25°C
0.01
0.1
1
10
100
1E-6 10E-6 100E-6 1E-3 10E-3 100E-3 1E+0
Output Power [W]
THD+N [%]
f=10kHz
f=100Hz,
f=1kHz
f=100Hz: BW=22Hz-30kHz
f=1kHz : BW=4 00 Hz-30 kHz
f=10kHz: BW=400Hz-80kHz
THD+N vs. Output Power (Ambient Temperature)
V+=9V, f=1kHz, Gv=10dB, RL=100Ω, BW=400Hz-30kHz
0.01
0.1
1
10
100
1E-6 10E-6 100E-6 1E-3 10E-3 100E-3 1E+0
Output Power [W]
THD+N [%]
Ta=-2 0°C
Ta=25°C
Ta=75°C
Power Dissipation vs. Output Power
f
=1kHz, Gv=10dB, RL=100Ω, BW=400Hz-30kHz, Ta=25°C, 2ch Input
0
20
40
60
80
100
120
140
160
180
0 20406080100120140
Output Power [mW/ch]
Power Dissipation [mW]
V+=10V
V+=9V
V+=8V
THD=10%
THD=10
%
THD=10
%
Output Power vs. Operating Voltage
f=1kHz, THD=10%, Gv=10dB, RL=100Ω, BW=400Hz-30kHz
0
20
40
60
80
100
120
140
160
180
200
6 7 8 9 10 11 12 13
Operating Voltage [V]
Output Power [mW]
Ta=75°C
Ta=25°C
Ta=-20°
Output Noise Voltatge 1 vs. Ambient Temperature
V+=9V, Gv=0dB, RL=100Ω, Rg=0Ω, A-Weighted, MUTE=L
-120
-115
-110
-105
-100
-95
-90
-85
-80
-50 0 50 100 150
Ambient Temperature[°C]
Output Noise Voltatge 1 [dBV]
NJM2777
– 15 –
■
■■
■ TYPICAL CHARACTERISTICS
Output Noise Voltatge 2 vs. Ambient Temperature
V+=9V, RL=100Ω, Rg=0Ω, A-Weighted, MUTE=H
-120
-115
-110
-105
-100
-95
-90
-85
-80
-50 0 50 100 150
Ambient Temperature[°C]
Output Noise Voltatge 2 [dBV]
[CAUTION]
The specifications on this data book are only
given for information, without any guarantee
as regards either mistakes or omissions. The
application circuits in this data book 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.
