TGS LM2904N

TIGER ELECTRONIC CO.,LTD
LM2904N/D
LOW POWER DUAL OPERATIONAL AMPLIFIER LM2904
DESCRIPTION
Outline Drawing
The LM2904 consists of two independent, high gain,
internally frequency compensated operational
amplifiers which were designed specifically to
operate from a single power supply over a wide range
of voltages. Operation from split power supplies is
also possible and the low power supply current drain
is independent of the magnitude of the power supply
LM2904N
voltage.
Application areas include transducer amp lifiers,
DIP-8
DC gain blocks and all the conventional op amp
circuits which now can be more easily implemented
in single power supply systems. For example, the
LM2904 can be directly operated off of the standard
LM2904D
+5V power supply voltage which is used in digital
systems and will easily provide the required
interface electronics without requiring the additional
±1 5V power su p p lies.
SOP-8
UNIQUE CHARACTERISTICS
In the linear mode the input common-mode voltage range includes ground and the
output voltage can also swing to ground, even though operated from only a single power
supply voltage.
The unity gain cross frequency is temp erature comp ensated.
The input bias current is also temp erature comp ensated.
ADVANTAGES
Two internally comp ensated op amps.
Eliminates need for dual supplies.
Allows direct sensing near GND and V O U T also goes to GND.
Comp atible with all forms of logic.
Power drain suitable for battery operation.
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LM2904N/D
FEATURES
Internally frequency compensated for unity gain
Large dc voltage gain: 100 dB
Wide bandwidth (unity gain): 1 MHz (temperature comp ensated)
Wide power supply range:
— Single supply: 3V to 32V
— or dual supplies: ±1.5V to ±16V
Very low supply current drain (500 µA)—essentially independent of supply voltage.
Low input offset voltage: 2 mV
Input common-mode voltage range includes ground
Differential input voltage range equal to the power supply voltage
Large output voltage swing: 0V to V+- 1.5V
BLOCK DIAGRAM AND PIN CONNECTION
8 V+
OUTPUT A 1
INVERTING
INPUT A 2
NON-INVERTING
INPUT A 3
GND
7 OUTPUT B
A
- +
B
+ -
6 INVERTING
INPUT B
5 NON-INVERTING
INPUT B
4
ABSOLUTE MAXIMUM RATINGS (Ta=25 °C)
Characteristic
Supply Voltage,V
+
Differential Input Voltage
Input Vo ltage
Power Dissipation (Note 1)
Value
Unit
3 2 或 ±1 6
V
32
V
-0.3~32
V
DIP Package
550
SOP Package
530
Output Short-Circuit to GND( One Amplifier)( Note 2)
( V + ≤15V、 Ta=2 5℃ )
mW
Continuous
50
mA
Operating Temp erature Range
-20~+85
℃
Storage Temp erature Range
-65~150
℃
Input Current ( V I N <-0.3V) (Note 3)
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LM2904N/D
ELECTRICAL CHARACTERISTICS
Parameter
(Unless otherwise specified: V + =5.0V)
Test Conditions
Input Offset Vo ltage
Ta=2 5℃ ( Note 5)
Input Bias Current
Ta=2 5℃ , I I N ( + ) or I I N ( - ) ,
V C M =0V ( Note 6)
Min.
Input Offset Current
Ta=2 5℃ , I I N ( + ) - I I N ( - ), V C M =0V
Input
Common-Mode
Ta=2 5℃ , V + =30V( Note 7)
Vo ltage Range
Over
Full
Temperature V + =30V
Supply Current
Range, R L =∞ on all Op
V + =5V
Amps
+
Larg e Signal Vo ltage V =15V, Ta=2 5℃ , R L ≥2 k Ω
Gain
( For Vo =1~11V)
Co mmon-M ode
DC, Ta=2 5℃ , V C M =0~V + -1.5V
Rejection Ratio
Power Supply
DC, Ta=2 5℃ , V + =5~30V
Rejection Ratio
Amplifier-to-Amplifier Ta=2 5℃ , f=1~20kHz
Coupling
( Input Referred)( Note 8)
V I N ( + ) =1V,V I N ( - ) =0V,V + =15V,Vo=2V,
Source
Ta=2 5℃
V I N ( - ) =1V,V I N ( + ) =0V,V + =15V,Vo=2V,
Output
Current
Ta=2 5℃
Sink
V I N ( - ) =1V,V I N ( + ) =0V,V + =15V,
Vo=200mV,Ta=25℃
Output
Vo ltage
Swing
Max.
Unit
2
5
mV
45
150
nA
3
30
nA
V + -1.5
V
0
1
2
0.5
1.2
100
V/mV
70
90
dB
75
100
dB
-120
dB
20
40
mA
10
20
mA
12
50
µA
40
( Note 5)
60
mA
7
mV
µV/℃
7
Rs=0Ω
IIN(+) - IIN( -)
100
Rs=0Ω
10
I I N ( + ) or I I N ( - )
40
V + =30V( Note 7)
mA
50
Short Circuit to Ground V + =15V, Ta=2 5℃ ( Note 2 )
Input Offset Vo ltage
Input Offset Vo ltage
Drift
Input Offset Current
Input Offset Current
Drift
Input Bias Current
Input
Common-Mode
Vo ltage Range
Larg e Signal Vo ltage
Gain
Typ.
0
nA
pA/℃
300
V+2
nA
V
V + =15V,( Vo=1~11V), R L ≥2 k Ω
25
V/mV
R L =2kΩ
26
V
R L =10kΩ
27
VOH
V + =30V
VOL
V + =5V, R L =10kΩ
28
5
V
20
mV
+
Output
Current
Source
Sink
V I N ( + ) =1V , V I N ( - ) =0V , V =15V ,
Vo=2V
V I N ( - ) =1V , V I N ( + ) =0V , V + =15V ,
Vo=2V
10
20
mA
5
8
mA
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LM2904N/D
Note 1 The dissipation is the total of both amplifiers—use external resistors, where possible, to allow
the amplifier to saturate or to reduce the power which is dissipated in the integrated circuit.
Note 2: Short circuits from the output to V + can cause excessive heating and eventual destruction.
W h e n c o n s i d e r i n g s h o r t c i r c u i t s t o g r o u n d , t he m a x i m u m o u t p u t c u r r e n t i s a p p r o x i m a t e l y 4 0 m A
independent of the magnitude of V + . At values of supply voltage in excess of +15V, continuous
short-circuits can exceed the power dissipation ratings and cause eventual destruction. Destructive
dissipation can result from simultaneous shorts on all amplifiers.
Note 3: This input current will only exist when the voltage at any of the input leads is driven negative.
It is due to the collector-base junction of the input PNP transistors becoming forward biased and
t h e r e b y a c t i n g a s i n p u t d i o d e c l a m p s . I n a d d i t i o n t o t hi s d i o d e a c t i o n , t h e r e i s a l s o l a t e r a l N P N p a r a s i t i c
transistor action on the IC chip. This transistor action can cause the output voltages of the op amps to
go to the V + voltage level (or to ground for a large overdrive) for the time duration that an input is
driven negative. This is not destructive and normal output states will re-establish when the input
voltage, which was negative, again returns to a value greater than -0.3V (at 25°C).
N o t e 4 : W i t h t h e D 3 5 8 , a l l t e m p e r a t u r e s p e c i f i c a t i o n s a r e l i m i t e d t o - 2 5 ℃ ≤ Ta ≤ 8 5 ℃ .
Note 5: Vo=1.4V, Rs = 0Ω with V + from 5V to 30V; and over the full input common-mode range (0V to
V + -1.5V) at 25°C
Note 6: The direction of the input current is out of the IC due to the PNP input stage. This current is
essentially constant, independent of the state of the output so no loading change exists on the input
lines.
Note 7: The input common-mode voltage of either input signal voltage should not be allowed to go
negative by more than 0.3V (at 25°C). The upper end of them common-mode voltage range is V + -1.5V
(at 25°C), but either or both inputs can go to +32V without damage, independent of the magnitude of
V+.
N o t e 8 : D u e t o p r o x i m i t y o f e x t e r n a l c o m p o n e n t s , i n s ur e t h a t c o u p l i n g i s n o t o r i g i n a t i n g v i a s t r a y
capacitance between these external parts. This typically can be detected as this type of capacitance
increases at higher frequencies.
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LM2904N/D
TYPICAL SINGLE-SUPPLY APPLICATION CIRCUIT
Non-Inverting DC Gain (0V output)
+5V
+V IN *
+
1/2 LM2904
D358
-
Vo(V)
+Vo
R2
1M
R1
10K
Gain=1+R2/R1
=101 (as shown )
0
* R not needed due to temperature independent I
DC Summing Amplifier
VIN(mV)
Power Amplifier
( VIN'S ≥0V, and Vo≥0V)
R 100K
+V1
+V2
+
R
1/2 LM2904
D358
100K
-
R 100K
R 100K
+V3
+V4
R1
+Vo
100K
R3
R
+V IN 91K
100K
R 100K
910K
R2
+
V
+
LM2904
1/2 D358
-
+Vo
RL
I N =0 V, Av =1 0
Vo =0 V fo r V
Where Vo=V1+V2+V3+V4
(V1+V2)≥(V3+V4) to Keep Vo>0V
"BI-QUAD" RC Active Bandpass Filter
R1
Fixed Current Sources
V+
100K
C1
+
R2
VIN 100K
R3
100K
1/2 LM2904
D358
330pF
R4
C2
330pF
470K
LM2904
1/2 D358
10M
-
-
LM2904
1/2 D358
+
R6
-
LM2904
1/2 D358
fo=1kHz
Q=50
Av=100(40dB)
R5
+
+
Vo
470K
R7
R8
100K
C3
10uF
+
2V R1 R2
- 2K
+ R3
2V
- 2K
+
100K V
R4
3K
I1
I2
1mA
I2=(R1/R2)*I1
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LM2904N/D
APPLICATION HINTS
The LM2904 is op amps which operate with only a single power supply voltage, have
true-differential inputs, and remain in the linear mode with an input common-mode voltage
of 0V. These amplifiers operate over a wide range of power supply voltage with little
change in performance characteristics. At 25°C amplifier operation is possible down to a
minimum supply voltage of 2.3 V.
Precautions should be taken to insure that the power supply for the integrated circuit
never becomes reversed in polarity or that th e unit is not inadvertently installed backwards
in a test socket as an unlimited current surge through the resulting forward diode within the
IC could cause fusing of the internal conductors and result in a destroyed unit.
Large differential input voltages can be easily accommodated and, as input differential
voltage protection diodes are not needed, no large input currents result from large
differential input voltages. The differential input voltage may be larger than V + without
damaging the device. Protection should be provided to prevent the input voltages from
going negative more than -0.3V (at 25°C). An input clamp diode with a resistor to the IC
input terminal can be used.
To reduce the power supply current drain, the amplifiers have a class A output stage for
small signal levels which converts to class B in a large signal mode. This allows the
amplifiers to both source and sink large output currents. Therefore both NPN and PNP
external current boost transistors can be used to extend the power capability of the basic
amplifiers. The output voltage needs to raise approximately 1 diode drop above ground to
bias the on-chip vertical PNP transistor for output current sinking applications.
For ac applications, where the load is capacitively coupled to the output of the amplifier,
a resistor should be used, from the output of the amplifier to ground to increase the class A
bias current and prevent crossover distortion. Wh ere the load is directly coupled, as in dc
applications, there is no crossover distortion.
Capacitive loads which are applied directly to the output of the amplifier reduce the loop
stability margin. Values of 50pF can be accomodated using the worst-case non-inverting
unity gain connection. Large closed loop gains or resistive isolation should be used if larger
load capacitance must be driven by the amplifier.
Output short circuits either to ground or to the positive power suppl y should be of short
time duration. Units can be destroyed, not as a result of the short circuit current causing
metal fusing, but rather due to the large increase in IC chip dissipation which will cause
eventual failure due to excessive function temperatures. Putting direct short-circuits on
more than one amplifier at a time will increase the total IC power dissipation to destructive
levels, if not properly protected with external dissipation limiting resistors in series with
the output leads of the amplifiers. The larg er value of output source current which is
available at 25°C provides a larger output curre nt capability at elevated temperatures (see
typical performance characteristics) than a standard IC op amp.
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LM2904N/D
TYPICAL PERFORMANCE CHARACTERISTICS
7/8
LM2904N/D
8/8