NJM2777
Headphone Amplifier with Electronic Volume
I
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.
I
FEATURES
G
Operating Voltage
G
Electronic Volume
G
Mute Function
G
Bipolar
G
Package Outline
I
BLOCK DIAGRAM
CNTa CAPa
Mute
I
PACKAGE OUTLINE
NJM2777D
NJM2777M
NJM2777V
8 to 10 V
+20dB to -80dB
DIP14, DMP14, SSOP14
Mute
IN a
VOL
OUTa
IN b
VOL
OUTb
Bias
Vref
CNTb CAPb
I
PIN FUNCTION
No.
1
1
14
2
3
4
5
7
8
6
7
SYMBOL
V+ GND
V+
OUTb
CNTb
CAPb
INb
Mute
N.C.
FUNCTION
Power Supply
Bch Output
Bch Volume control voltage
input
Bch Volume control click
noise absorbing capacitor
connect terminal
Bch Input
Mute control
No connecting
No.
8
9
10
11
12
13
14
SYMBOL
N.C.
Vref
INa
CAPa
CNTa
OUTa
GND
FUNCTION
No connecting
Reference voltage stabilized
capacitor connect terminal
Ach Input
Ach Volume control click
noise absorbing capacitor
connect terminal
Ach Volume control voltage
input
Ach Output
Ground
–1–
NJM2777
I
ABSOLUTE MAXIMUM RATING (Ta=25°C)
°
PARAMETER
SYMBOL
Supply Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
V
+
RATING
12
DIP14 : 500
DMP14 : 500*
SSOP14 : 440*
-20 to +75
-40 to +125
UNIT
V
mW
°C
°C
P
D
Topr
Tstg
I
ELECTRICAL CHARACTERISTICS
+
*(Note) EIA/JEDEC STANDARD Test board(76.2 x 114.3 x 1.6mm, 2layers, FR-4)mounting
(V =9V, V
IN
=-20dBV, f=1kHz, R
L
=100Ω, Gv=0dB,”Mute” terminal =L, Ta=25
°C
)
G
POWER SUPPLY
PARAMETER
Operating Voltage
Operating Current
Reference Voltage
G
AMPLIFIER
SYMBOL
V
+
TEST CONDITION
No Signal
MIN.
8
-
4
TYP.
9
5
4.1
MAX.
10
8
4.2
UNIT
V
mA
V
I
CC
V
REF
SYMBOL
G
EVR
∆Gv
V
IM
P
O
THD
CS
Mute
V
NO1
V
NO2
PSRR
SYMBOL
V
IH
V
IL
PARAMETER
Volume Operating Range
Voltage Gain Channel Balance
Maximum Input Voltage
Output Power
Total Harmonic Distortion
Channel Separation
Mute Level
Output Noise Voltage 1
Output Noise Voltage 2
Power Supply Ripple Rejection
G
CONTROL
TEST CONDITION
V
CNTa
, V
CNTb
= 0 to 3.3V
Gv=-10dB
MIN.
80
-1.5
8.9
(2.8)
70
-
70
-
-
-
-
MIN.
2
0
TYP.
100
0
9.5
(3.0)
100
0.1
80
-85
-95
(18)
-105
(5.6)
70
TYP.
-
-
MAX.
-
1.5
-
-
1
-
-75
-85
(56)
-95
(18)
-
MAX.
V
+
0.4
UNIT
dB
dB
dBV
(Vrms)
mW
%
dB
dB
dBV
(µVrms)
THD=3%
Gv=10dB,
THD=10%
Rg=600Ω, Vin = 0dBV
“Mute” terminal=H,
Vin = 0dBV
Rg=0Ω, A-Weighted
“Mute” terminal =H
Rg=0Ω, A-Weighted
Vripple=-20dBV
Rg=0Ω
dBV
(µVrms)
dB
UNIT
V
V
PARAMETER
High Level Input Voltage
Low Level Input Voltage
TEST CONDITION
I
CONTROL TERMINAL
Operating Condition
Mute
Active
Operating
Condition
Control Terminal
Mute Terminal
Description
Mute the signal
Output the signal
H
L, OPEN
–2–
NJM2777
I
TEST CIRCUIT
TEST CIRCUIT1 (THD, GEVR, VIM, PO)
Input B
CNT B
Output B
100Ω
0.47µF
1µF
V
CNTB
100µF
V+
[THD] BPF:400 to 30KHz
[G
EVR
] BPF:1KHz
7
N.C.
6
Mute
5
INb
4
3
2
1
V+
10µF
CAPb CNTb OUTb
VOL
VOL
Bias
N.C.
8
Vref
9
10µF
INa
10
CAPa CNTa OUTa GND
11
12
13
100µF
14
0.47µF
1µF
Output A
V
CNTA
100Ω
[THD] BPF:400 to 30KHz
[G
EVR
] BPF:1KHz
Input A
CNT A
Volume Range :
G
EVR
=
20 log
Vo
max
Vo
min
Vomin : Output voltage at VCNT=0V
Vomax : Output voltage at VCNT=3.3V
–3–
NJM2777
TEST CIRCUIT 2 (VNO1,VNO2,VREF)
Input B
CNT B
Output B
100Ω
V
CNTB
0.47µF
1µF
100µF
[V
NO1
, V
NO2
]
A-Weighted
V+
7
N.C.
6
Mute
5
INb
4
3
2
1
V+
10µF
CAPb CNTb OUTb
VOL
VOL
Bias
N.C.
8
Vref
9
INa
10
CAPa CNTa OUTa GND
11
12
13
100µF
14
10µF
[V
REF
]
0.47µF
1µF
V
CNTA
100Ω
Output A
Input A
CNT A
[V
NO
, V
NO2
]
A-Weighted
–4–
NJM2777
TEST CIRCUIT 3 (Icc)
Input B
CNT B
Output B
100Ω
Rg=600Ω
V
CNTB
100µF
V+
[Icc]
1µF
0.47µF
7
N.C.
6
Mute
5
INb
4
3
2
1
V+
10µF
CAPb CNTb OUTb
VOL
VOL
Bias
N.C.
8
Vref
9
INa
10
CAPa CNTa OUTa GND
11
12
13
100µF
V
CNTA
14
0.47µF
10µF
Rg=600Ω
1µF
Output A
100Ω
Input A
CNT A
–5–
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