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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=25C) 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
PD 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, VIN=-20dBV, f=1kHz, RL=100, Gv=0dB,"Mute" terminal =L, Ta=25C) GPOWER SUPPLY
PARAMETER Operating Voltage Operating Current Reference Voltage
GAMPLIFIER
SYMBOL V
+
TEST CONDITION No Signal
MIN. 8 4
TYP. 9 5
4.1
MAX. 10 8
4.2
UNIT V mA
V
ICC VREF SYMBOL GEVR Gv VIM PO THD CS Mute VNO1 VNO2 PSRR SYMBOL
VIH VIL
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
GCONTROL
TEST CONDITION
VCNTa, VCNTb = 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
+
UNIT dB dB dBV (Vrms) mW % dB dB dBV
(Vrms)
THD=3%
Gv=10dB, THD=10%
Rg=600, Vin = 0dBV "Mute" terminal=H, Vin = 0dBV Rg=0, A-Weighted "Mute" terminal =H Rg=0, A-Weighted Vripple=-20dBV Rg=0
dBV
(Vrms)
dB UNIT
V V
PARAMETER
High Level Input Voltage Low Level Input Voltage
TEST CONDITION
0.4
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
100 0.47F 1F VCNTB 100F
V+
[THD] BPF:400 to 30KHz [GEVR] BPF:1KHz
7 N.C.
6 Mute
5 INb
4
3
2
1 V+
10F
CAPb CNTb OUTb
VOL
VOL Bias
N.C. 8
Vref 9
10F
INa 10
CAPa CNTa OUTa GND 11 12 13
100F
14
0.47F 1F
Output A
VCNTA 100 [THD] BPF:400 to 30KHz [GEVR] BPF:1KHz
Input A
CNT A
Volume Range : GEVR= 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
100 VCNTB 0.47F 1F 100F [VNO1, VNO2] A-Weighted
V+
7 N.C.
6 Mute
5 INb
4
3
2
1 V+
10F
CAPb CNTb OUTb
VOL
VOL Bias
N.C. 8
Vref 9
INa 10
CAPa CNTa OUTa GND 11 12 13
100F
14
10F [VREF]
0.47F 1F VCNTA 100
Output A
Input A
CNT A
[VNO, VNO2] A-Weighted
-4-
NJM2777
TEST CIRCUIT 3 (Icc)
Input B
CNT B
Output B
100
Rg=600
VCNTB 100F
V+
[Icc]
1F
0.47F
7 N.C.
6 Mute
5 INb
4
3
2
1 V+
10F
CAPb CNTb OUTb
VOL
VOL Bias
N.C. 8
Vref 9
INa 10
CAPa CNTa OUTa GND 11 12 13
100F VCNTA
14
0.47F 10F Rg=600 1F
Output A
100
Input A
CNT A
-5-
NJM2777
TEST CIRCUIT 4 (CS)
Input B
CNT B
Rg=600 VCNTB 1F
100 100F [CS] BPF:1KHz
0.47F
7 N.C.
6 Mute
5 INb
4
3
2
1 V+
10F
CAPb CNTb OUTb
VOL
Rg=600
VOL Bias
N.C. 8
Vref 9
INa 10
CAPa CNTa OUTa GND 11 12 13
100F
14
0.47F 10F 1F
Output A
VCNTA 100 [CS] BPF:1KHz
Rg=600
Input A
CNT A
-6-
NJM2777
TEST CIRCUIT 5 (PSRR) Input B CNT B Output B
100 VCNTB 1F 100F [PSRR] BPF:1KHz
Rg=0
0.47F
7 N.C.
6 Mute
5 INb
4
3
2
1 V+
10F
CAPb CNTb OUTb
V+
VOL
VOL Bias
N.C. 8
Vref 9
INa 10
CAPa CNTa OUTa GND 11 12 13
100F
14
0.47F 10F Rg=0 1F
Output A
VCNTA 100 [PSRR] BPF:1KHz
Input A
CNT A
-7-
NJM2777
TEST CIRCUIT 6 (MUTE) Input B CNT B Output B
0.47F 1F
VCNTB
100 100F
V+
[MUTE] BPF:1KHz
7 N.C.
6 Mute
5 INb
4
3
2
1 V+
10F
CAPb CNTb OUTb
VOL
VOL Bias
N.C. 8
Vref 9
10F
INa 10
CAPa CNTa OUTa GND 11 12 13 14
0.47F 1F
100F
Output A
[MUTE] BPF:1KHz 100
Input A
CNT A
-8-
NJM2777
I APPLICATION CIRCUIT Input B Output B
1F 1F
CNT B
0.47F 100F 75
100k
7 N.C.
6 Mute
5 INb
4
3
2
1 V+
10F
CAPb CNTb OUTb
VOL
VOL Bias
N.C. 8
Vref 9
INa 10
CAPa CNTa OUTa GND 11 12 13
100F
14
0.47F 10F 1F
Output A CNT A Input A
75
-9-
NJM2777
I TERMINAL DESCRIPTION
PIN NO.
SYMBOL OUTb OUTa
FUNCTION Bch Output Ach Output
EQUIVALENT CIRCUIT
TERMINAL VOLTAGE
2 13
18k 1k 200 25p
2.2
OUT
V+/2
3 12
CNTb CNTa
Bch Volume Control Ach Volume Control
CAP CNT
200 42k 42k
-
4 11
CAPb CAPa
Bch Volume control click noise absorbing capacitor connect terminal Ach Volume control click noise absorbing capacitor connect terminal CAP CNT
200 42k 42k
-
5 10
INb INa
Bch Input Ach Input
IN
200
GND
50k
- 10 -
NJM2777
I TERMINAL DESCRIPTION
PIN NO.
SYMBOL Mute
FUNCTION Mute Control
EQUIVALENT CIRCUIT
TERMINAL VOLTAGE
6
Mute
200
GND
400k
9
Vref
Reference voltage stabilized capacitor connect terminal
100k
Vref
100k
V+/2
200
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NJM2777
I TYPICAL CHARACTERISTICS
Operating Current vs. Operating Voltage
No signal, MUTE=L, Ta=25C 8 7 6
Operating Current vs. Ambient Temperature
V+=9V, No signal, MUTE=L 8 7 6 Operating Current [mA] 5 4 3 2 1 0
Operating Current [mA]
5 4 3 2 1 0 4 6 8 10 12 14 Operating Voltage [V]
-50
0
50 Ambient Temperature [C]
100
150
Reference Voltage vs. Operating Voltage
No signal, MUTE=L, Ta=25C 7
Reference Voltage vs. Ambient Temperature
V+=9V, No signal, MUTE=L 7
6
Reference Voltage [V]
Reference Voltage [V]
6
5
5
4
4
3
3
2 4 6 8 10 12 14 Operating Voltage [V]
2 -50 0 50 Ambient Temperature [C] 100 150
Voltage Gain vs. Control Voltage (Operating Voltage)
Vin=-20dBV, f=1kHz, RL=100, Ta=25C 40 20 0
Voltaqge Gain [dB] Voltage Gain[dB]
Voltage Gain vs. Control Voltage (Frequency)
V+=9V, Vin=-20dBV, RL=100, Ta=25C 40 20 0 -20 -40
f=100Hz, 1kHz, 10kHz
-20 -40 -60 -80 -100 0.0
V+=8V, 9V, 10V
-60 -80 -100 0.0
0.5
1.0
1.5
2.0
2.5
3.0
0.5
1.0
1.5
2.0
2.5
3.0
VCNT [V]
VCNT [V]
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NJM2777
I TYPICAL CHARACTERISTICS
Voltage Gain vs. Control Voltage (Ambient Temperature)
V+=9V, Vin=-20dBV, f=1kHz, RL=100 40 20 0
-20C 25C
Mute Level vs. Mute Control Voltage
V+=9V, Vin=0dBV, f=1kHz, Gv=0dB, RL=100 20
0
75C
Voltage Gain [dB]
-20 -40 -60 -80 -100 0.0
Mute Level [dB]
-20
Ta=-20C
-40
Ta=25C
T a=75C
-60
-80
0.5
1.0
1.5
2.0
2.5
3.0
-100 0.0
1.0
2.0 Mute Control Voltage [V]
3.0
4.0
VCNT [V]
Mute Level vs. Frequency
V+=9V, Vin=0dBV, Gv=0dB, RL=100, MUTE=H, Ta=25C 0 -10 -20 -30 0 -10 -20 -30
Mute Level vs. AMbient Temperature
V+=9V, Vin=0dBV, f=1kHz, Gv=0dB, RL=100, MUTE=H
Mute Level [dB]
Mute Level [dB]
-40 -50 -60 -70 -80 -90 -100 -110 10 100 1000 Frequency [Hz] 10000 100000
-40 -50 -60 -70 -80 -90 -100 -110 -50 0 50 100 150
Ambient Temperature [C]
Voltage Gain Channel Balance vs. Control Voltage (Ambient Temperature)
Voltage Gain Channel Balance vs. Control Voltage (Frequency)
V+=9V, Vin=-20dBV, f=1kHz, RL=100 1.5
V+=9V, Vin=-20dBV, RL=100, Ta=25C 1.5
Voltage Gain Channel Balance [dB]
f=10kHz
Voltage Gain Channel Balance [dB]
1
1
-20C
0.5
0.5
0
0
-0.5
100Hz
f=1kHz
-0.5
25C
-1
-1
75C
-1.5 0.0
-1.5
0.5 1.0 1.5 2.0 2.5 3.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
VCNT [V]
VCNT [V]
- 13 -
NJM2777
I TYPICAL CHARACTERISTICS
THD+N vs. Output Power (Operating Voltage)
f=1kHz, Gv=10dB, RL=100, BW=400Hz-30kHz, Ta=25C 100
V+=10V
THD+N vs. Output Power (Frequency)
V+=9V, Gv=10dB, RL=100, Ta=25C 100
f=100Hz: BW=22Hz-30kHz f=1kHz : BW=400Hz-30kHz f=10kHz: BW=400Hz-80kHz
10
V+=9V
10
V+=8V
THD+N [%]
1
THD+N [%]
f=10kHz
1
0.1
0.1
f=100Hz, f=1kHz
0.01 1E-6
10E-6
100E-6
1E-3
10E-3
100E-3
1E+0
0.01 1E-6
10E-6
100E-6
1E-3
10E-3
100E-3
1E+0
Output Power [W]
Output Power [W]
THD+N vs. Output Power (Ambient Temperature)
V+=9V, f=1kHz, Gv=10dB, RL=100, BW=400Hz-30kHz 100
Power Dissipation vs. Output Power
f=1kHz, Gv=10dB, RL=100, BW=400Hz-30kHz, Ta=25C, 2ch Input
180 160
10
140
Power Dissipation [mW]
Ta=25C Ta=-20C
120
THD=10%
THD+N [%]
1
100
V+=10V
80
V+=9V
THD=10 %
60 40
V+=8V
0.1
Ta=75C
THD=10 %
20
0.01 1E-6
0
10E-6 100E-6 1E-3 10E-3 100E-3 1E+0
0
20
40
60
80
100
120
140
Output Power [W]
Output Power [mW/ch]
Output Power vs. Operating Voltage
f=1kHz, THD=10%, Gv=10dB, RL=100, BW=400Hz-30kHz 200 180 160 140
Output Power [mW]
Ta=75C
Output Noise Voltatge 1 vs. Ambient Temperature
V+=9V, Gv=0dB, RL=100, Rg=0, A-Weighted, MUTE=L -80 -85
Output Noise Voltatge 1 [dBV]
Ta=25C
-90 -95 -100 -105 -110 -115 -120 -50
120 100 80 60 40 20 0 6 7
Ta=-20
8
9
10
11
12
13
0
50
100
150
Operating Voltage [V]
Ambient Temperature[C]
- 14 -
NJM2777
I TYPICAL CHARACTERISTICS
Output Noise Voltatge 2 vs. Ambient Temperature
V+=9V, RL=100, Rg=0, A-Weighted, MUTE=H -80 -85
Output Noise Voltatge 2 [dBV]
-90 -95 -100 -105 -110 -115 -120 -50
0
50
100
150
Ambient Temperature[C]
[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.
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