NJRC NJM2775A

NJM2775A
PRELIMINARY
PRE&HI-POWER AMPLIFIER with ALC for PORTABLE TAPE RECORDER
■ 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.
■ FEATURES
●Operating Voltage
●Operating Current
●Output Power
●Automatic Level Control
(ALC) Limit Level
●Ripple Filter R.R.
(Ripple Rejection)
●Bipolar Technology
●Package Outline
■ PACKAGE OUTLINE
NJM2775AM
+
V =1.8 to 6.0V
9mA typ.
+
350mW typ. at V =3V,RL=4Ω,THD=10%
200mVrms typ., at f=1kHz
47dB typ., at f=200Hz,C=47µF
DMP16
■ PIN CONFIGURATION
1
PRE+IN
2
SGND
3
POW+INA
PRE-IN
16
PREOUT
15
PRE
AMP
POWOUTA
14
V+
13
POWER
AMPA
4
POW-INA
5
POW-INB
PGND
12
POWER
AMPB
6
POW+INB
7
RFOUT
POWOUTB
TC
RIPPLE
FILTER
8
RFIN
11
10
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
9
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NJM2775A
PRELIMINARY
■ ABSOLUTE MAXIMUM RATINGS
PARAMETER
(Ta=25°C)
SYMBOL
+
RATINGS
UNIT
Supply Voltage
V
+7.0
V
PA Output Peak Current
IOP
1
A
PA Input Voltage Range
VIN
±0.4
V
Power Dissipation
PD
(DMP16)300
mW
Operating Temperature Range
Topr
-20 to +75
°C
Storage Temperature Range
Tstg
-40 to +125
°C
■ RECOMMENDED OPERATING VOLTAGE RANGE (Ta=25°C)
PARAMETER
MIN.
TYP
MAX.
UNIT
Operating Voltage Range
1.8
3.0
6.0
V
+
■ ELECTORICAL CHARACTERISTICS
PARAMETER
Operating Voltage
(V =3.0V,Ta=25°C)
SYMBOL
ICC
RATINGS
MIN.
TYP
MAX.
UNIT
-
9
14
mA
-
140
-
nA
mV
RL=∞
Power Amp
Input Bias Current
IB
Out Put Offset
∆Vo
-
0
50
+
400
500
-
+
250
300
-
-
0.2
-
%
41
44
47
dB
RL=8Ω
Output Power
PO1
(Note 1)
PO2
THD=10%,f=1kHz,V =3V,RL=4Ω
T.H.D.
THD
V =4V,RL=8Ω,Po=200mW,f=1kHz
Close Loop V-Gain
Av1
f=1kHz
Equivalent Input
VNI1
RS=10kΩ,RL=4Ω,A-Weighted
-
2.0
-
µVrms
VNI2
RS=10kΩ,RL=4Ω,BW=22Hz to 22kHz
-
2.5
-
µVrms
Ripple Rejection
RR1
f=100Hz
-
47
-
dB
Cut off Frequency
FH
RL=4Ω,Po=0.1W, Av=-3dB from f=1kHz
-
80
-
kHz
Output Voltage
Vo1
f=1kHz,THD=1%
0.1
0.2
-
Vrms
Voltage Gain
Av
f=1kHz
35
38
41
dB
Output Noise Voltage
VNO
Rs=3.3kΩ
-
0.1
0.4
mVrms
ALC
f=1kHz
100
200
300
mVrms
Output Voltage
VO2
RL=2kΩ
+
+
+
Ripple Rejection
RR2
Noise Voltage
THD=10%,f=1kHz,V =4V,RL=8Ω
+
mW
Pre Amp
ALC
Limit Level
Ripple Filter
f=200Hz,C=47µF
V -0.24 V -0.2 V -0.16
40
47
54
(Note 1) at on PC Board
-2-
V
dB
NJM2775A
PRELIMINARY
■ TYPICAL APPLICATIONS
HEAD
PB
MIC
1
PRE+IN
2
SGND
3
POW+INA
PRE-IN
16
REC
EQ.
PRE
AMP
PREOUT
15
ON/OFF
POWOUTA
POW-INA
4
0.01µF
14
2.2Ω
0.01µF
POWER
AMPA
V+
13
4.7Ω
4Ω/8Ω
10µF
0.1µF
POW-INB
5
PGND
12
SPEAKER
POWER
AMPB
0.01µF
POW+INB
6
POWOUTB
PB
11
REC
2.2Ω
7
MIC. Current
TC
RFOUT
47µF
RIPPLE
FILTER
8
RFIN
0.01µF
10
ALC
ALCIN
9
47µF
HEAD
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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