NJRC NJM2781V Monaural microphone amplifier Datasheet

NJM2781
Monaural Microphone Amplifier
■ PACKAGE OUTLINE
■ GENERAL DESCRIPTION
NJM2781 is a monaural microphone amplifier IC with a standby
function, and can vary a voltage gain by adjusting an external
resistor.
Since the NJM2781 operates with a low voltage range of +2.7V to
+4.5V and is available in tiny packages of TVSP8 and SSOP8, it is
ideally suited for portable and handheld components.
NJM2781RB1
NJM2781V
■ FEATURES
● Operating Voltage
● Operating Current
+2.7V to +4.5 V
1.8mA typ.
1µA max. (in Standby mode)
● Bipolar Technology
● Package Outline
TVSP8, SSOP8
■ BLOCK DIAGRAM
NOISE
1
GND
8
V+
7
REG
2
Reg
STBY
OUT
3
4
IN-
IN+
6
5
■ PIN FUNCTION
1
4
8
5
No.
SYMBOL
FUNCTION
No.
SYMBOL
FUNCTION
1
NOISE
Noise Bypass
5
IN-
Inverted Input
2
REG
Regulator Output
6
OUT
Output
3
STBY
Standby On/Off
7
V+
Power Supply
4
IN+
Non-Inverted Input
8
GND
Ground
–1–
NJM2781
■ ABSOLUTE MAXIMUM RATING (Ta=25°°C)
PARAMETER
SYMBOL
+
RATING
UNIT
Supply Voltage
V
5
V
Power Dissipation
PD
TVSP8:320, SSOP8:250
mW
Operating Temperature Range
Topr
-40 to 85
°C
Storage Temperature Range
Tstg
-40 to 125
°C
■ ELECTRICAL CHARACTERISTICS
+
(Ta=25°C,V =2.8V,Vin=-40dBV, f=1kHz,RL=9kΩ)
●Power Supply
PARAMETER
SYMBOL
TEST CONDITION
Operating Voltage
V
Operating Current 1
Icc1
No signal, Standby
Operating Current 2
Icc2
No signal, Active
Mic Power Supply Voltage
Vo
+
RL=6.8kΩ
MIN.
TYP.
MAX.
UNIT
2.7
2.8
4.5
V
-
1
µA
1.8
4
mA
2.3
2.42
2.54
V
MIN.
TYP.
MAX.
UNIT
1.28
1.35
1.42
V
24
-2.7
(0.73)
25
-1.5
(0.84)
26
dB
dBV
(Vrms)
-
0.025
0.1
%
-
-98
(12.6)
-90
(31.6)
dBV
(µVrms)
65
80
-
dB
MIN.
TYP.
MAX.
UNIT
●Amplifier
PARAMETER
SYMBOL
Output Voltage
Vo
Voltage Gain
GV
Test Circuit 1
Maximum Output Voltage
VOM
THD=0.1%
Total Harmonic Distortion
(THD+N)
THD
Output Noise
VNO
Power Supply Ripple
Rejection
●Control
PARAMETER
PSRR
SYMBOL
TEST CONDITION
Rg=600Ω, A-Weighted
Rg=600Ω,
Vripple=-20dBV
TEST CONDITION
-
+
High Level Input Voltage
VIH
STBY terminal
2
-
V
V
Low Level Input Voltage
VIL
STBY terminal
0
-
0.5
V
■Standby Mode Operation
–2–
Status
Control Terminal
STBY
IC Condition
Active
H
IC active
Standby
L, OPEN
IC standby
NJM2781
■ TEST CIRCUIT
Test Circuit 1 (Voltage Gain Gv, Maximum Output Voltage VOM, Total Harmonic Distortion THD)
1µF
8
GND
V+
7
V+
3
OUT
6
4
IN-
5
REG
10µF
2
100Ω
10µF
Input
6.8kΩ
V+
NOISE
GND
1
Reg
STBY
IN+
0.33µF
2.2µF
47kΩ
15kΩ
Output
9kΩ
[THD]
BPF:400 to 22kHz
4.7µF
680Ω
Test Circuit 2 (DC Output Voltage VO, Output Noise VNO)
1µF
1
REG
10µF
2
100Ω
10µF
Input
NOISE
STBY
3
6.8kΩ
V+
4
0.33µF
IN+
Reg
GND
8
GND
V+
7
V+
OUT
6
IN-
5
47kΩ 15kΩ
2.2µF
Output
9kΩ
4.7µF
680Ω
[VNO]
A-Weighted
Rg=600Ω
–3–
NJM2781
Test Circuit 3 (Operating Current Icc1,Icc2)
1µF
8
V+
7
3
OUT
6
4
IN-
5
REG
10µF
2
100Ω
10µF
6.8kΩ
Input
V+
NOISE
GND
1
Reg
STBY
IN+
0.33µF
GND
V+
47kΩ
2.2µF
15kΩ
Output
9kΩ
4.7µF
680Ω
Icc1:STBY=L
Icc2:STBY=H
Test Circuit 4 (Mic Power Supply Voltage Vo)
1µF
8
GND
V+
7
V+
3
OUT
6
4
IN-
5
REG
6.8kΩ
2
10µF
100Ω
10µF
6.8kΩ
Input
0.33µF
V+
–4–
NOISE
GND
1
STBY
IN+
Reg
47kΩ
2.2µF
15kΩ
4.7µF
680Ω
Output
9kΩ
NJM2781
Test Circuit 5 (Power Supply Ripple Rejection PSRR)
1µF
1
NOISE
REG
10µF
2
100Ω
10µF
Input
Reg
STBY
3
6.8kΩ
4
V+
GND
8
V+
7
OUT
6
IN-
5
IN+
0.33µF
GND
V+
47kΩ
2.2µF
15kΩ
Output
9kΩ
[PSRR]
BPF:1kHz
4.7µF
680Ω
Rg=600Ω
Test Circuit 6 (Stand-By Control Voltage VIH, VIL)
1µF
1
NOISE
REG
10µF
2
100Ω
10µF
Input
STBY
3
6.8kΩ
4
0.33µF
IN+
Reg
GND
8
GND
V+
7
V+
OUT
6
IN-
5
47kΩ
2.2µF
15kΩ
Output
9kΩ
4.7µF
680Ω
–5–
NJM2781
■ APPLICATION CIRCUIT
1µF
1
REG
10µF
2
100Ω
10µF
Input
STBY
3
6.8kΩ
V+
–6–
NOISE
4
0.33µF
IN+
Reg
GND
8
GND
V+
7
V+
OUT
6
IN-
5
47kΩ
2.2µF
15kΩ
4.7µF
680Ω
9kΩ
Output
NJM2781
■ TERMINAL DESCRIPTION
PIN
NO.
SYMBOL
1
NOISE
FUNCTION
TERMINAL
VOLTAGE
EQUIVALENT CIRCUIT
Noise Bypass
V+
V+
V+
V+
3.6k
0.54V
NOISE
500
27k
2
REG
Regulator Output
V+
V+
V+
8k
REG
3
STBY
2.42V
Standby On/Off
V+
V+
STBY
460
30k
0V
30k
4
IN+
Non-Inverted Input
V+
REG
48k
1.35V
IN+
76k
60k
–7–
NJM2781
■ TERMINAL DESCRIPTION
PIN
NO.
SYMBOL
5
IN-
FUNCTION
TERMINAL
VOLTAGE
EQUIVALENT CIRCUIT
Inverted Input
V+
1.35V
IN-
6
OUT
Output
V+
V+
300
OUT
16p
–8–
1.35V
NJM2781
■ SPECIFICATIONS
Operating Current vs. Ambient Temperature (Standby)
Operating Current vs. Pow er Supply Voltage (Standby)
RL=9kΩ,Ta=25°C
0.8
0.8
0.6
0.6
0.4
0.4
0.2
0
-0.2
-0.4
0.2
0
-0.2
-0.4
-0.6
-0.6
-0.8
-0.8
-1
0
1
V+=2.8V,RL=9kΩ
1
Operating Current [µA]
Operating Current [µA]
1
2
3
Pow er Supply Voltage [V]
4
-1
-40
5
Operating Current vs. Pow er Supply Voltage (Active)
10
60
Ambient Teperature [°C]
Operating Current vs. Ambient Temperature (Active)
V+=2.8V,RL=9kΩ
2.5
2.5
2
2
Operating Current [mA]
Operating Current [mA]
RL=9kΩ,Ta=25°C
1.5
1
0.5
1.5
1
0.5
0
0
-0.5
-40
-0.5
0
1
2
3
Pow er Supply Voltage [V]
4
5
Operating Current vs. Standby Voltage
10
60
Ambient Temperature [°C]
110
Output Voltage vs. Input Voltage (Standby)
V+=2.8V,RL=9kΩ,Ta=25°C
2.5
f=1kHz,RL=9kΩ,Ta=25°C
0
2
-20
1.5
Output Voltage [dBV]
Operating Current [mA]
110
1
0.5
0
-40
-60
-80
-100
-120
-0.5
0
0.5
1
1.5
2
Standby Voltage [V]
2.5
3
-140
-40
-30
-20
-10
Input Voltage [dBV]
0
–9–
NJM2781
Mic Pow er Supply Voltage vs. Pow er Supply Voltage
Mic Pow er Supply Voltage vs. Ambient Temperature
RL=6.8kΩTa=25°C
3
V+=2.8V,RL=6.8kΩ
3
2.5
Mic Power Supply Voltage [V]
Mic Power Supply Voltage [V]
2.5
2
1.5
1
0.5
0
2
1.5
1
0.5
0
-0.5
0
1
2
3
Pow er Supply Voltage [V]
-0.5
-40
4
110
Voltage Gain vs. Ambient Temperature
Voltage Gain vs. Frequency
V+=2.8V,Vin=-40dBV,f=1kHz,RL=9kΩ
V+=2.8V,Vin=-40dBV,RL=9kΩ,Ta=25°C
30
30
28
28
Voltage Gain [dB]
Voltage Gain [dB]
10
60
Ambient Temperature [°C]
26
24
26
24
22
22
20
10
10E+0
100
100E+0
1k
1E+3
10k
10E+3
100k
100E+3
20
-40
Frequency [Hz]
Votage Gain vs. Standby Voltage (Ta)
V+=2.8V,RL=9kΩ,Rg=600Ω,A-w eighted
-80
20
-85
0
-90
-20
Output Noise [dBV]
Voltage Gain [dB]
110
Output Noise vs. Ambient Temperature
V+=2.8V,Vin=-40dBV,f=1kHz,RL=9kΩ
40
10
60
Ambient Temperature [°C]
Ta=-40°C
Ta=85°C
-40
Ta=25°C
-60
-80
-95
-100
-105
-110
-100
-115
-120
0
– 10 –
0.5
1
1.5
2
Standby Voltage [V]
2.5
3
-120
-40
10
60
Ambient Temperature [°C]
110
NJM2781
Total Harmonic Distortion vs. Output Voltage (V+)
Total Harmonic Distortion vs. Output Voltage (Ta)
Vin=-40dBV,RL=9kΩ,Ta=25°C
V+=2.7V
V+=2.8V
V+=4.5V
1
THD+N %
[ ]
THD+N %
[ ]
1
0.1
Ta=-40°C
Ta= 25°C
Ta= 85°C
0.1
0.01
0.01
0.001
-35
-25
-15
Output Voltage [dBV]
-5
5
0.001
-35
-15
-5
5
Pow er Supply Ripple Rejection vs. Frequency
V+=2.8V,RL=9kΩ,Ta=25°C
10
100
f=100Hz : BW= 10-22kHz
f=1kHz : BW=400-22kHz
f=10kHz : BW=400-80kHz
V+=2.8V,Vin=-40dBV,RL=9kΩ,Ta=25°C
80
1
PSRR [dB]
f=10kHz
0.1
0.01
-25
Output Voltage [dBV]
Total Harmonic Distortion vs. Output Voltage ( f )
THD+N %
[ ]
V+=2.8V,f=1kHz,RL=9kΩ
10
10
f=100Hz
60
40
20
f=1kHz
0.001
-35
-25
-15
Output Voltage [dBV]
-5
5
0
10
10E+0
100
100E+0
1k
1E+3
Frequency [Hz]
10k
10E+3
100k
100E+3
[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.
– 11 –
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