NJM2775A
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PRE&HI-POWER AMPLI FIER 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-amplif ier, ALC circuit, power amplif iers,
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
●Operating Voltage V+=1.8 to 6.0V
●Operating Current 9mA typ.
●Output Power 350mW typ. at V+=3V,RL=4Ω,THD=10%
●Automatic Level Control 200mVrms typ., at f=1kHz
(ALC) Limit Level
●Ripple Filter R.R. 47dB typ., at f=200Hz,C=47µF
(Ripple Rejection)
●Bipolar Technology
●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
6POW+INB
7RFOUT
11
PRE+IN
10
V+
POW-INB
A
LCIN
POWOUTA
POWOUTB
SGND
89
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
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■
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■ ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER 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
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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 ICC RL=∞-914mA
Power Amp
Input Bias Current IB- 140 - nA
Out Put Offset ∆Vo RL=8Ω-050mV
Output Power PO1THD=10%,f=1kHz,V+=4V,RL=8Ω400 500 -
(Note 1) PO2THD=10%,f=1kHz,V+=3V,RL=4Ω250 300 - mW
T.H.D. THD V+=4V,RL=8Ω,Po=200mW,f=1kHz -0.2- %
Close Loop V-Gain Av1 f=1kHz 41 44 47 dB
Equivalent Input VNI1RS=10kΩ,RL=4Ω,A-Weighted -2.0-
µVrms
Noise Voltage V
NI2RS=10kΩ,RL=4Ω,BW=22Hz to 22kHz -2.5-
µVrms
Ripple Rejection RR1 f=100Hz - 47 - dB
Cut off Frequency FHRL=4Ω,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 VNO Rs=3.3kΩ-0.10.4mVrms
ALC
Limit Level ALC f=1kHz 100 200 300 mVrms
Ripple Filter
Output Voltage VO2RL=2kΩV+-0.24 V+-0.2 V+-0.16 V
Ripple Rejection RR2 f=200Hz,C=47µF40 47 54 dB
(Note 1) at on PC Board
NJM2775A
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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
7RFOUT
11
PRE+IN
10
V+
47µF
0.01µF
4.7Ω
HEAD
MIC
10µF
POW-INB
0.01µF
SPEAKER
A
LCIN
POWOUTA
POWOUTB
PB
REC
SGND
89
0.01µF
PB
REC
47µF
MIC. Cu rre n t
EQ.
0.1µF
2.2Ω
PB
REC
HEAD
POWER
AMPA
RIPPLE
FILTER ALC
POWER
AMPB
RFIN
TC
0.01µF
2.2Ω
4Ω/8Ω
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. T h e
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 ri
g
hts.
