NJM2775A
PRELIMINARY
- 1 -
PRE&HI-POWER AMPLIFIER with ALC for PORTABLE TAPE RECORDER
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GENERAL DESCRIPTION
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PACKAGE OUTLINE
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.
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FEATURES
q
Operating Voltage
V
+
=1.8 to 6.0V
q
Operating Current
9mA typ.
q
Output Power
350mW typ. at V
+
=3V,R
L
=4
,THD=10%
q
Automatic Level Control
200mVrms typ., at f=1kHz
(ALC) Limit Level
q
Ripple Filter R.R.
47dB typ., at f=200Hz,C=47
F
(Ripple Rejection)
q
Bipolar Technology
q
Package Outline
DMP16
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PIN CONFIGURATION
1
2
3
4
16
15
14
13
POW-INA
POW+INA
PREOUT
PGND
PRE-IN
12
PRE
AMP
5
6
POW+INB
7
RFOUT
11
PRE+IN
10
V
+
POW-INB
ALCIN
POWOUTA
POWOUTB
SGND
8
9
POWER
AMPA
RIPPLE
FILTER
ALC
POWER
AMPB
RFIN
TC
NJM2775AM
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
NJM2775A
PRELIMINARY
- 2 -
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ABSOLUTE MAXIMUM RATINGS (Ta=25
C)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
V
+
+7.0
V
PA Output Peak Current
I
OP
1
A
PA Input Voltage Range
V
IN
0.4
V
Power Dissipation
P
D
(DMP16)300
mW
Operating Temperature Range
Topr
-20 to +75
C
Storage Temperature Range
Tstg
-40 to +125
C
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RECOMMENDED OPERATING VOLTAGE RANGE (Ta=25
C)
PARAMETER
MIN.
TYP
MAX.
UNIT
Operating Voltage Range
1.8
3.0
6.0
V
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ELECTORICAL CHARACTERISTICS (V
+
=3.0V,Ta=25
C)
PARAMETER
SYMBOL
RATINGS
MIN.
TYP
MAX.
UNIT
Operating Voltage
I
CC
R
L
=
-
9
14
mA
Power Amp
Input Bias Current
I
B
-
140
-
nA
Out Put Offset
Vo
R
L
=8
-
0
50
mV
Output Power
P
O
1
THD=10%,f=1kHz,V
+
=4V,R
L
=8
400
500
-
(Note 1)
P
O
2
THD=10%,f=1kHz,V
+
=3V,R
L
=4
250
300
-
mW
T.H.D.
THD
V
+
=4V,R
L
=8
,Po=200mW,f=1kHz
-
0.2
-
%
Close Loop V-Gain
Av1
f=1kHz
41
44
47
dB
Equivalent Input
V
NI
1
R
S
=10k
,R
L
=4
,A-Weighted
-
2.0
-
Vrms
Noise Voltage
V
NI
2
R
S
=10k
,R
L
=4
,BW=22Hz to 22kHz
-
2.5
-
Vrms
Ripple Rejection
RR1
f=100Hz
-
47
-
dB
Cut off Frequency
F
H
R
L
=4
,Po=0.1W, Av=-3dB from f=1kHz
-
80
-
kHz
Pre Amp
Output Voltage
Vo1
f=1kHz,THD=1%
0.1
0.2
-
Vrms
Voltage Gain
Av
f=1kHz
35
38
41
dB
Output Noise Voltage
V
NO
Rs=3.3k
-
0.1
0.4
mVrms
ALC
Limit Level
ALC
f=1kHz
100
200
300
mVrms
Ripple Filter
Output Voltage
V
O
2
R
L
=2k
V
+
-0.24 V
+
-0.2 V
+
-0.16
V
Ripple Rejection
RR2
f=200Hz,C=47
F
40
47
54
dB
(Note 1) at on PC Board
NJM2775A
PRELIMINARY
- 3 -
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TYPICAL APPLICATIONS
1
2
3
4
16
15
14
13
POW-INA
POW+INA
PREOUT
PGND
ON/OFF
PRE-IN
12
PRE
AMP
5
6
POW+INB
7
RFOUT
11
PRE+IN
10
V
+
47
F
0.01
F
4.7
HEAD
MIC
10
F
POW-INB
0.01
F
SPEAKER
ALCIN
POWOUTA
POWOUTB
PB
REC
SGND
8
9
0.01
F
PB
REC
47
F
MIC. Current
EQ.
0.1
F
2.2
PB
REC
HEAD
POWER
AMPA
RIPPLE
FILTER
ALC
POWER
AMPB
RFIN
TC
0.01
F
2.2
4
/8
[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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