NJM2783
Monaural Microphone Amplifier with ALC
"GENERAL
DESCRIPTION
The
NJM2783
is a monaural microphone amplifier with
auto level control function to avoid distortion due to clipping.
The voltage gain and the limit level are adjustable by
external resistors.
It is suitable for mini component audio system, home
audio system, karaoke and others.
"PACKAGE
OUTLINE
"
FEATURES
•
Operating Voltage
•
Monaural Microphone Amplifier
•
Auto level control (ALC) function
(Adjustable the limit level
by external resistors
•
Adjustable the voltage gain
by external resistors
•
Additional Gain Amplifier
•
Built-in Buffer Amplifier
•
Low Equivalent Input Noise
•
Carefully designed to reject RF noise
•
Bipolar Technology
•
Package Outline
"
BLOCK DIAGRAM
NJM2783V
+2.7 to +13.0V
200mVrms to 2Vrms)
+20 to +63dB (R
SENSE
=OPEN)
0dB/+20dB switchable
1µVrms typ.
SSOP14
IN
GAIN SW
INT
SENSE
VREF
V+
GND
Detector
Bias
Microphone Amprifier
Additional Gain
0dB/+20dB
Buffer Amplifier
100k
100k
VCR
GAIN1
GAIN2
DET
OUT
BUFFIN
BUFFGAIN BUFFOUT
Version 7.0E
–1–
NJM2783
"PIN
CONFIGURATION
SSOP14
1
2
3
4
5
6
7
14
13
12
11
10
9
8
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Symbol
GAIN1
GAIN2
DET
OUT
BUFFIN
BUFFGAIN
BUFFOUT
GND
V+
VREF
SENSE
INT
GAIN SW
IN
Function
Microphone Amp Gain Setting 1
Microphone Amp Gain Setting 2
Detector Input
Microphone Amp Output
Buffer Input
Buffer Gain Setting
Buffer Output
Ground
Power Supply
Reference Voltage
Limit Level Setting
Recovery Time Setting
Gain Setting
Microphone Input
–2–
Version 7.0E
NJM2783
"ABSOLUTE
MAXIMUM RATING
(Ta=25°C)
PARAMETER
Power Supply Voltage
Power Dissipation
Maximum Input Voltage
Operating Temperature Range
Storage Temperature Range
1)
2)
SYMBOL
V
+
RATING
+14
450*
1)
+ 2)
UNIT
V
mW
V
°C
°C
P
D
V
IMAX
Topr
Tstg
0~V *
-40 ~ +85
-40 ~ +125
* EIA/JEDEC STANDARD Test board (76.2 x 114.3 x 1.6mm, 2layers, FR-4) mounting
*
Don’t put Input Voltage more than Power Supply Voltage.
"RECOMMENDED
OPERATING VOLTAGE RANGE
(Ta=25°C)
PARAMETER
Operating Voltage Range
SYMBOL
V
+
TEST CONDITION
-
MIN.
2.7
TYP.
9.0
MAX.
13.0
UNIT
V
"ELECTRICAL
CHARACTERISTICS
#POWER
SUPPLY
(Ta=25°C, V =9.0V unless otherwise specified)
PARAMETER
Operating Current
Reference Voltage
SYMBOL
I
CC
V
REF
TEST CONDITION
No signal
No signal
MIN.
-
4.2
TYP.
3.5
4.5
MAX.
6.0
4.8
UNIT
mA
V
+
#AC
CHARACTERISTICS
+
(Ta=25°C, V =9.0V, V
IN
=0.7mVrms, f=1kHz, R
G1
=330Ω, R
G2
=47kΩ, R
SENSE
=OPEN, R
L
=4.7kΩ,
GAIN SW=+20dB unless otherwise specified)
PARAMETER
Voltage Gain 1
Voltage Gain 2
Maximum Output Voltage
ALC Level 1
ALC Level 2
ALC Off
Equivalent Input Noise Voltage
Total Harmonic Distortion
Power Supply Ripple Rejection
SYMBOL
G
V1
G
V2
V
OM
V
LIM1
V
LIM2
V
OFF
V
NO
THD+N
RR
+
TEST CONDITION
MIN.
60
TYP.
63
43
2.4
1.0
1.0
2.0
-120
(1.0)
-
-35
MAX.
66
46
-
1.3
1.3
2.4
-110
(3.2)
1
-20
UNIT
dB
dB
Vrms
Vrms
Vrms
Vrms
dBV
(µVrms)
%
dB
GAIN SW=0dB
THD=1%
V
IN
=1.4mVrms
R
SENSE
=47kΩ
V
IN
=40mVrms
R
SENSE
=47kΩ
V
IN
=1.4mVrms
Rg=0Ω, A-weighted
BW=400-30kHz
V
ripple
=100mVrms, f=1kHz
40
2.0
0.7
0.7
1.6
-
-
-
#CONTROL
CHARACTERISTICS
(Ta=25°C, V =9.0V unless otherwise specified)
PARAMETER
High Level Input Voltage
Low Level Input Voltage
Control Current
SYMBOL
V
IH
V
IL
I
SW
V
IH
=5V
TEST CONDITION
-
-
MIN.
2.0
0
-
TYP.
-
-
-
MAX.
V
+
UNIT
V
V
µA
0.5
100
Version 7.0E
–3–
NJM2783
"
CONTROL TERMINAL EXPLANATION
GAIN SW
(13 pin)
MODE
0dB
+20dB
STATUS
L
H
NOTE
The gain of microphone amplifier is not increased.
The gain of microphone amplifier is increased +20dB.
"TEST
CIRCUIT
V
+
V
IN
0.47
µ
F V
IL
V
IH
1
µ
F
R
SENSE
10
µ
F
10
µ
F
V
+
14
IN
13
GAIN SW
12
INT
11
SENSE
10
VREF
9
V+
8
GND
Detector
Bias
GAIN1
GAIN2
DET
OUT
BUFFIN
BUFFGAIN
BUFFOUT
1
2
3
4
5
0.47
µ
F
6
7
R
G2
R
G1
10
µ
F
1
µ
F
4.7
µ
F
4.7
µ
F
VR
10k
Ω
V
4.7k
Ω
–4–
Version 7.0E
NJM2783
"APPLICATION
CIRCUIT
V
+
INPUT
V
+
1
µ
F
47k
Ω
10
µ
F
10
µ
F
V
+
0.47
µ
F
14
IN
13
GAIN SW
12
INT
11
SENSE
10
VREF
9
V+
8
GND
Detector
Bias
GAIN1
GAIN2
DET
OUT
BUFFIN
BUFFGAIN
BUFFOUT
1
2
3
4
5
0.47
µ
F
6
7
47k
Ω
330
Ω
10
µ
F
1
µ
F
4.7
µ
F
4.7
µ
F
VR
10k
Ω
OUTPUT
Version 7.0E
–5–
单片机
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