www.njr.com
Designated client product
This product will be discontinued its pr oduction in the near term.
And it is provided for customers currently in use only, with a time limit .
It can not be avail able for your new project. Please select other new or
existing products.
For more information, please contact our sales office in y our r eg ion.
New Japan Radio Co.,Ltd.
NJM2073
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1
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Ver.2004-03-01
DUAL LOW VOLTAGE POWER AMPLIFIER
■ GENERAL DESCRIPTION ■ PACKAGE OUTLINE
The NJM2073 is a monolithic integrated circuit in 8 lead
dual-in-line package,which is designed for dual audio power
amplifier in portable radio and handy cassette player.
■ FEATURES
● Operating Voltage ( V+=1.8V~15V )
● Low Crossover Distortion
● Low Operating Current
● Bridge or Stereo Configuration
● No Turn-on Noise
● Package Outline DIP8,DMP8
● Bipolar Technology
■ PIN CONFIGURATION
NJM2073D
NJM2073M
NJM2073D NJM2073M
NJM2073
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■ ABSOLUTE MAXIMUM RATINGS
( Ta=25˚C )
PARAMETER SYMBOL RATINGS UNIT
■ ELECTRICAL CHARACTERISTICS D-Type
(1) BTL Configuration ( Test Circuit Fig.1 ) ( V
+=6V,Ta=25˚C )
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Operating Voltage V+ 1.8 - 15 V
Operating Current ICC R
L=∞ - 6 9 mA
Output Offset Voltage ∆VO R
L=8Ω - 10 50 mV
( Between the Outputs )
Input Bias Current IB - 100 - nA
Output Power THD=10%,f=1kHz
P
O V
+=9V,RL=16Ω ( Note ) - 2.0 - W
P
O V
+=6V,RL=8Ω ( Note ) 0.9 1.2 - W
P
O V
+=4.5V,RL=8Ω - 0.6 - W
P
O V
+=4.5V,RL=4Ω ( Note ) - 0.8 - W
P
O V
+=3V,RL=4Ω 200 300 - mW
P
O V
+=2V,RL=4Ω - 80 - mW
THD=1%,f=40Hz~15kHz
P
O V
+=6V,RL=8Ω - 1.0 - W
P
O V
+=4.5V,RL=4Ω - 0.6 - W
Total Harmonic Distortion THD PO=0.5W,RL=8Ω,f=1kHz - 0.2 -
%
Close Loop Voltage Gain AV f=1kHz 41 44 47 dB
Input Impedance ZIN f=1kHz 100 - - kΩ
Equivalent Input Noise Voltage VNI1 R
S=10kΩ,A Curve - 2 - µV
V
NI2 R
S=10kΩ,B=22Hz~22kHz - 2.5 - µV
Ripple Rejection RR f=100Hz - 40 - dB
Cutoff Frequency fH A
V=-3dB from f=1kHz,RL=8Ω,PO=1W - 130 - kHz
( Note ) At on PC Board
Supply Voltage V+ 15 V
Output Peak Current IOP 1 A
( DIP8 ) 700
Power Dissipation PD ( DMP8 ) 300 mW
Input Voltage Range VIN ± 0.4 V
Operating Temperature Range Topr -40~+85 ˚C
Storage Temperature Range Tstg -40~+125 ˚C
NJM2073
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Ver.2004-03-01
(2) Stereo Configuration ( Test Circuit Fig.2 )
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Operating Voltage V+ 1.8 - 15 V
Output Voltage VO - 2.7 - V
Operating Current ICC R
L=∞ - 6 9 mA
Input Bias Current IB - 100 - nA
Output Power ( Each Channel ) THD=10%,f=1kHz
P
O V
+=6V,RL=4Ω ( Note ) 0.5 0.65 - W
P
O V
+=4.5V,RL=4Ω - 0.32 - W
P
O V
+=3V,RL=4Ω - 120 - mW
P
O V
+=2V,RL=4Ω
THD=1%,f=1kHz
- 30 - mW
P
O V
+=6V,RL=4Ω - 500 - mW
P
O V
+=4.5V,RL=4Ω - 250 - mW
Total Harmonic Distortion THD PO=0.4W,RL=4Ω,f=1kHz - 0.25 - %
Voltage Gain AV f=1kHz 41 44 47 dB
Channel Balance ∆AV - - ± 1 dB
Input Impedance ZIN f=1kHz 100 - - kΩ
Equivalent Input Noise Voltage VNI1 R
S=10kΩ,A Curve - 2.5 - µV
V
NI2 R
S=10kΩ,B=22Hz~22kHz - 3 - µV
Ripple Rejection RR f=100Hz,CX=100µF 24 30 - dB
Cutoff Frequency fH A
V=-3dB from f=1kHz,RL=8Ω,PO=250mW - 200 - kHz
( Note ) At on PC Board
■ ELECTRICAL CHARACTERISTICS M-Type
(1) BTL Configuration ( Test Circuit Fig.1 ) ( V
+=6V,Ta=25˚C )
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Operating Voltage V+ 1.8 - 15 V
Operating Current ICC R
L=∞ - 6 9 mA
Output Offset Voltage ∆VO R
L=8Ω - 10 50 mV
( Between the Outputs )
Input Bias Current IB - 100 - nA
Output Power THD=10%,f=1kHz
P
O V
+=6V,RL=16Ω ( Note ) - 0.8 - W
P
O V
+=4V,RL=8Ω ( Note ) 350 460 - mW
P
O V
+=3V,RL=4Ω ( Note ) 200 300 - mW
P
O V
+=2V,RL=4Ω
THD=1%,f=40Hz~15kHz
- 80 - mW
P
O V
+=4V,RL=8Ω - 380 - mW
Total Harmonic Distortion THD V+=4V,RL=8Ω,PO=200mW,f=1kHz - 0.2 - %
Close Loop Voltage Gain AV f=1kHz 41 44 47 dB
Input Impedance ZIN f=1kHz 100 - - kΩ
Equivalent Input Noise Voltage VNI1 R
S=10kΩ,A Curve - 2 - µV
V
NI2 R
S=10kΩ,B=22Hz~22kHz - 2.5 - µV
Ripple Rejection RR f=100Hz - 40 - dB
Cutoff Frequency fH A
V=-3dB from f=1kHz,RL=16Ω,PO=0.5W - 130 - kHz
( Note ) At on PC Board
NJM2073
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(2) Stereo Configuration ( Test Circuit Fig.2 )
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Operating Voltage V+ 1.8 - 15 V
Output Voltage VO - 2.7 - V
Operating Current ICC R
L=∞ - 6 9 mA
Input Bias Current IB - 100 - nA
Output Power ( Each Channel ) THD=10%,f=1kHz
P
O V
+=6V,RL=16Ω - 240 - mW
P
O V
+=5V,RL=8Ω ( Note ) - 270 - mW
P
O V
+=4V,RL=4Ω ( Note ) 180 250 - mW
P
O V
+=3V,RL=4Ω - 120 - mW
P
O V
+=2V,RL=4Ω
THD=1%,f=1kHz
- 30 - mW
P
O V
+=4V,RL=4Ω - 180 - mW
Total Harmonic Distortion THD V+=4V,RL=4Ω,PO=150mW,f=1kHz - 0.25 -
%
Voltage Gain AV f=1kHz 41 44 47 dB
Channel Balance ∆AV - - ± 1 dB
Input Impedance ZIN f=1kHz 100 - - kΩ
Equivalent Input Noise Voltage VNI1 R
S=10kΩ,A Curve - 2.5 - µV
V
NI2 R
S=10kΩ,B=22Hz~22kHz - 3 - µV
Ripple Rejection RR f=100Hz,CX=100µF 24 30 - dB
Cutoff Frequency fH A
V=-3dB from f=1kHz,RL=16Ω,PO=125mW - 200 - kHz
( Note ) At on PC Board
■ TYPICAL APPLICATION & TEST CIRCUIT
Fig.1 BTL Configuration Fig.2 Stereo Configuration
note:pin No.to D,M-Type
NJM2073
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Ver.2004-03-01
■ PARASTIC OSCILLATION PREVEMTING CIRCUIT
Put 1Ω+0.22µF on parallel to load,if the load is speaker.Recommend putting 0.1µF and more than 100µF capacitors with good high
frequency characteristics in to near ground and supply voltage pins.
In BTL operation of less than 2V supply voltage,parastic oscillation may be occurred with R=1Ω.And so recommended R to be the
same value of pure resistance(r) when it is lower than 3V.
■ MUTING CIRCUIT
When Mute ON.OUTPUT level saturates to GND side.
Fig.3 BTL Configuration Fig.4 Stereo Configuration
■ VOLTAGE GAIN REDUCTION APPLICATION EXAMPLE
(1) Outline of way to further Reduction
NJM2073 by taking in assamption,as one of OP-AMP ( Gain 44dB,minus input impedance about 300Ω ),to feedback from output to
minus input helps to get reduction of stabilized Voltage Gain.Fig.5 indicates the model example.
Here is the point to be noticed that,in order to get the appropriate output Bias Voltage,it is important to keep the minus input floating
as DC condition,(inserting CX),and also that when extended too much reduction of Gain might cause Oscillation due to high band
phase margin.The reduction of voltage gain is limited at around 26dB (20 times),and when oscillation,it in necessary to attach the
oscillation stopper.Please examine the CX value accordingly to the application requirement.
Fig.5 Model of Voltage Gain Reduction
NJM2073
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(2) The Application Example of Voltage Gain Reduction. ( STEREO )
Fig.6 indicates the application example and Table1 indicates the recommendable value of parts to be attached externally.
Table1,Applicating purpose and Recommended Value of Externally parts to be attached.
EXTERNAL
PARTS APPLICATION PURPOSE RECOMMENDED
VALUE REMARKS
Rg Plus input to be grounded by
fixed DC
Under about 100kΩ Catch the noise when much higher.
Rs AV shall be decided with Rf -
Rf AV shall be decided with Rs About 5kΩ The co-temperature of AV becomes higher in case when RS is
higher resistance.The current from output pin to GND becomes
higher,in case when RS is lower resistance.(The current sinks in
vain.)
CX Minus input to be grounded by
fixed DC
- Low-band Cut off frequency (fL) is to be decided.
The rise time becomes longer in case that CX is big.
CCUP Output DC Decoupling When RL=8Ω,More
than 220µF
fL shall be decided by CCUP and ZL.
CP1 Stabilization of V+ More than about CCUP Inserting near around V+ pin and GND pin.
CP2 Prevention of Oscillation More than 0.1µF
r Prevention of Oscillation About RL Inserting near around V+ pin and GND pin.
C Prevention of Oscillation 0.22µF To be examined by about the resistor volume of the speaker load.
Fig.6 STEREO Application Example.
NJM2073
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● Application for Voltage Gain Reduction ( BTL )
Fig.7 indicates the application example,Table2 shows recommended value of externally attaching parts.
Table2 Applicating purpose and Recommended Value of External Part
EXTERNAL
PARTS APPLICATION PURPOSE RECOMMENDED
VALUE REMARKS
Rg DC condition ground of plus input Below about 10kΩ Making noise when higher.
Rs AV shall be decided with Rf -
Rf AV shall be decided with Rs About 5kΩ Temperature feature to be increased accordingly as in higher AV
value.
When lower,to be trended of Oscillation.
C1 Releasing minus input in to DC
condition
- Setting up low band Cut-off frequency (fL).
More higher,the rise time become longer.
C2 Preventing Oscillation About 0.02µF The more higher in value,the high band THD,due to phase slipping
to be deteriorated.
When lower,to be trended of oscillation.
CP1 Stability of V+
Preventing Oscillation
More than about
100µF
Inserting near around at V+ and the GND pin.
CP2 Preventing Oscillation More than 0.1µF Inserting near around at V+ and the GND pin.
r Preventing Oscillation About RL To be examined at around pure resister Value of speaker load.
C Preventing Oscillation 0.22µF
Fig.7 BTL Application
NJM2073
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■ TYPICAL CHARACTERISTICS
NJM2073
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9
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Ver.2004-03-01
■ TYPICAL CHARACTERISTICS
NJM2073
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10
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■ TYPICAL CHARACTERISTICS
NJM2073
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11
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Ver.2004-03-01
■ TYPICAL CHARACTERISTICS
[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.
