NJM2775A
PRELIMINARY
PRE&HI-POWER AMPLIFIER with ALC for PORTABLE TAPE RECORDER
s
GENERAL DESCRIPTION
The NJM2775A is a pre&power amplifier with ALC
designed for micro and compact cassette recorders.
It contains pre-amplifier, ALC circuit, power amplifiers,
and ripple filter. The pre-amplifier amplifies the signal
come from magnetic head. The ALC circuit limits the
input signal to optimize level in recording. The power
amplifiers drive a speaker in play back and the magnetic
head in recording. The ripple filter stabilizing the supply
voltage to the internal pre-amplifier and an external
condenser microphone.
The NJM2775A improves high output power compared
with the NJM2128.
It is suitable for portable tape recorder, and other
portable playing back and recording recorder items.
s
PACKAGE OUTLINE
NJM2775AM
s
FEATURES
qOperating
Voltage
qOperating
Current
qOutput
Power
qAutomatic
Level Control
(ALC) Limit Level
qRipple
Filter R.R.
(Ripple Rejection)
qBipolar
Technology
qPackage
Outline
V =1.8 to 6.0V
9mA typ.
+
350mW typ. at V =3V,R
L
=4Ω,THD=10%
200mVrms typ., at f=1kHz
47dB typ., at f=200Hz,C=47µF
+
DMP16
s
PIN CONFIGURATION
1
2
3
4
5
6
7
8
PRE+IN
PRE-IN
16
15
14
13
12
11
10
9
SGND
PRE
AMP
PREOUT
POW+INA
POWOUTA
POWER
AMPA
POW-INA
V
+
POW-INB
PGND
POWER
AMPB
POW+INB
POWOUTB
RFOUT
TC
RIPPLE
FILTER
RFIN
ALC
ALCIN
PIN FUNCTION
1.PRE +IN
2.SGND
3.POW +1NA
4.POW -INA
5.POW -INB
6.POW +INB
7.REFOUT
8.REFIN
9.ALCIN
10.TC
11.POW OUTB
12.PGND
+
13. V
14.POW OUTA
15.PREOUT
16.PRE -IN
-1-
NJM2775A
PRELIMINARY
s
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
PA Output Peak Current
PA Input Voltage Range
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
V
+
(Ta=25°C)
RATINGS
+7.0
1
±0.4
(DMP16)300
-20 to +75
-40 to +125
UNIT
V
A
V
mW
°C
°C
I
OP
V
IN
P
D
Topr
Tstg
s
RECOMMENDED OPERATING VOLTAGE RANGE
(Ta=25°C)
PARAMETER
MIN.
TYP
MAX.
UNIT
Operating Voltage Range
1.8
3.0
6.0
V
s
ELECTORICAL CHARACTERISTICS
PARAMETER
Operating Voltage
Power Amp
Input Bias Current
Out Put Offset
Output Power
(Note 1)
T.H.D.
Close Loop V-Gain
Equivalent Input
Noise Voltage
Ripple Rejection
Cut off Frequency
Pre Amp
Output Voltage
Voltage Gain
Output Noise Voltage
ALC
Limit Level
Ripple Filter
Output Voltage
Ripple Rejection
(Note 1) at on PC Board
V
O
2
RR2
R
L
=2kΩ
f=200Hz,C=47µF
ALC
f=1kHz
100
+
(V =3.0V,Ta=25°C)
RATINGS
R
L
=∞
MIN.
-
-
R
L
=8Ω
THD=10%,f=1kHz,V =4V,R
L
=8Ω
THD=10%,f=1kHz,V =3V,R
L
=4Ω
V =4V,R
L
=8Ω,Po=200mW,f=1kHz
f=1kHz
R
S
=10kΩ,R
L
=4Ω,A-Weighted
R
S
=10kΩ,R
L
=4Ω,BW=22Hz to 22kHz
f=100Hz
R
L
=4Ω,Po=0.1W, Av=-3dB from f=1kHz
f=1kHz,THD=1%
f=1kHz
Rs=3.3kΩ
+
+
+
+
SYMBOL
I
CC
I
B
∆Vo
P
O
1
P
O
2
THD
Av1
V
NI
1
V
NI
2
RR1
F
H
Vo1
Av
V
NO
TYP
9
140
0
500
300
0.2
44
2.0
2.5
47
80
0.2
38
0.1
200
+
MAX.
14
-
50
-
-
-
47
-
-
-
-
-
41
0.4
300
+
UNIT
mA
nA
mV
mW
%
dB
µVrms
µVrms
dB
kHz
Vrms
dB
mVrms
mVrms
V
dB
-
400
250
-
41
-
-
-
-
0.1
35
-
V -0.24 V -0.2 V -0.16
40
47
54
-2-
NJM2775A
PRELIMINARY
s
TYPICAL APPLICATIONS
HEAD
MIC
PB
1
REC
PRE+IN
PRE-IN
16
EQ.
2
3
POW-INA
SGND
PRE
AMP
PREOUT
15
ON/OFF
POW+INA
POWOUTA
14
2.2Ω
0.01µF
POWER
AMPA
V
+
4
0.01µF
10µF
POW-INB
13
12
4.7Ω
4Ω/8Ω
0.1µF
5
0.01µF
POW+INB
PGND
SPEAKER
PB
REC
POWER
AMPB
POWOUTB
11
6
MIC. Current
47µF
2.2Ω
0.01µF
7
8
47µF
RFOUT
TC
10
9
HEAD
RIPPLE
FILTER
RFIN
ALC
ALCIN
REC
PB
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook 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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