LM2900,LM3301,LM3900
LM2900/LM3900/LM3301 Quad Amplifiers
Literature Number: SNOSBV6
LM2900/LM3900/LM3301
Quad Amplifiers
General Description
The LM2900 series consists of four independent, dual input,
internally compensated amplifiers which were designed spe-
cifically to operate off of a single power supply voltage and to
provide a large output voltage swing. These amplifiers make
use of a current mirror to achieve the non-inverting input
function. Application areas include: ac amplifiers, RC active
filters, low frequency triangle, squarewave and pulse wave-
form generation circuits, tachometers and low speed, high
voltage digital logic gates.
Features
nWide single supply voltage: 4 V
DC
to 32 V
DC
Range or dual supplies: ±2V
DC
to ±16 V
DC
nSupply current drain independent of supply voltage
nLow input biasing current: 30 nA
nHigh open-loop gain: 70 dB
nWide bandwidth: 2.5 MHz (unity gain)
nLarge output voltage swing: (V
+
− 1) Vp-p
nInternally frequency compensated for unity gain
nOutput short-circuit protection
Schematic and Connection Diagrams
DS007936-1
Dual-In-Line and S.O.
DS007936-2
Top View
Order Number LM2900N, LM3900M, LM3900N or
LM3301N
See NS Package Number M14A or N14A
April 1998
LM2900/LM3900/LM3301 Quad Amplifiers
LM2900/LM3900/LM3301
© 1998 National Semiconductor Corporation DS007936 www.national.com 1
PrintDate=1998/04/29 PrintTime=11:07:21 39954 ds007936 Rev. No. 3 cmserv Proof 1
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
LM2900/LM3900 LM3301
Supply Voltage 32 V
DC
28 V
DC
±16 V
DC
±14 V
DC
Power Dissipation (T
A
=25˚C) (Note 2)
Molded DIP 1080 mW 1080 mW
S.O. Package 765 mW
Input Currents, I
IN+
or I
IN−
20 mA
DC
20 mA
DC
Output Short-Circuit Duration—One Amplifier Continuous Continuous
T
A
=25˚C (See Application Hints)
Operating Temperature Range −40˚C to +85˚C
LM2900 −40˚C to +85˚C
LM3900 0˚C to +70˚C
Storage Temperature Range −65˚C to +150˚C −65˚C to +150˚C
Lead Temperature (Soldering, 10 sec.) 260˚C 260˚C
Soldering Information
Dual-In-Line Package
Soldering (10 sec.) 260˚C 260˚C
Small Outline Package
Vapor Phase (60 sec.) 215˚C 215˚C
Infrared (15 sec.) 220˚C 220˚C
See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” for other methods of soldering surface mount
devices.
ESD tolerance (Note 8) 2000V 2000V
Electrical Characteristics
(Note 7) T
A
=25˚C, V
+
=15 V
DC
, unless otherwise stated
Parameter Conditions LM2900 LM3900 LM3301 Units
Min Typ Max Min Typ Max Min Typ Max
Open Voltage Gain Over Temp. V/mV
Loop Voltage Gain ∆V
O
=10 V
DC
1.2 2.8 1.2 2.8 1.2 2.8
Input Resistance Inverting Input 1 1 1 MΩ
Output
Resistance 889kΩ
Unity Gain Bandwidth Inverting Input 2.5 2.5 2.5 MHz
Input Bias Current Inverting Input, V
+
=5V
DC
30 200 30 200 30 300 nA
Inverting Input
Slew Rate Positive Output Swing 0.5 0.5 0.5 V/µs
Negative Output Swing 20 20 20
Supply Current R
L
=∞On All Amplifiers 6.2 10 6.2 10 6.2 10 mA
DC
Output V
OUT
High R
L
=2k, I
IN−
=0, 13.5 13.5 13.5
Voltage V
+
=15.0 V
DC
I
IN+
=0
Swing V
OUT
Low I
IN−
=10 µA, 0.09 0.2 0.09 0.2 0.09 0.2
I
IN+
=0V
DC
V
OUT
High V
+
=Absolute I
IN−
=0,
Maximum Ratings I
IN+
=0 29.5 29.5 26.0
R
L
=∞,
Output Source 6 18 6 10 5 18
Current Sink (Note 3) 0.5 1.3 0.5 1.3 0.5 1.3 mA
DC
Capability I
SINK
V
OL
=1V, I
IN−
=5µA 555
Power Supply Rejection T
A
=25˚C, f =100 Hz 70 70 70 dB
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Electrical Characteristics (Continued)
(Note 7) T
A
=25˚C, V
+
=15 V
DC
, unless otherwise stated
Parameter Conditions LM2900 LM3900 LM3301 Units
Min Typ Max Min Typ Max Min Typ Max
Mirror Gain @20 µA (Note 4) 0.90 1.0 1.1 0.90 1.0 1.1 0.90 1 1.10 µA/µA
@200 µA (Note 4) 0.90 1.0 1.1 0.90 1.0 1.1 0.90 1 1.10
∆Mirror Gain @20 µA to 200 µA (Note 4) 2 5 2 5 2 5 %
Mirror Current (Note 5) 10 500 10 500 10 500 µA
DC
Negative Input Current T
A
=25˚C (Note 6) 1.0 1.0 1.0 mA
DC
Input Bias Current Inverting Input 300 300 nA
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits.
Note 2: For operating at high temperatures, the device must be derated based on a 125˚C maximum junction temperature and a thermal resistance of 92˚C/W which
applies for the device soldered in a printed circuit board, operating in a still air ambient. Thermal resistance for the S.O. package is 131˚C/W.
Note 3: The output current sink capability can be increased for large signal conditions by overdriving the inverting input. This is shown in the section on Typical Char-
acteristics.
Note 4: This spec indicates the current gain of the current mirror which is used as the non-inverting input.
Note 5: Input VBE match between the non-inverting and the inverting inputs occurs for a mirror current (non-inverting input current) of approximately 10 µA. This is
therefore a typical design center for many of the application circuits.
Note 6: Clamp transistors are included on the IC to prevent the input voltages from swinging below ground more than approximately −0.3 VDC. The negative input
currents which may result from large signal overdrive with capacitance input coupling need to be externally limited to values of approximately 1 mA. Negative input
currents in excess of 4 mA will cause the output voltage to drop to a low voltage. This maximum current applies to any one of the input terminals. If more than one
of the input terminals are simultaneously driven negative smaller maximum currents are allowed. Common-mode current biasing can be used to prevent negative in-
put voltages; see for example, the “Differentiator Circuit” in the applications section.
Note 7: These specs apply for −40˚C ≤TA≤+85˚C, unless otherwise stated.
Note 8: Human body model, 1.5 kΩin series with 100 pF.
Application Hints
When driving either input from a low-impedance source, a
limiting resistor should be placed in series with the input lead
to limit the peak input current. Currents as large as 20 mA
will not damage the device, but the current mirror on the
non-inverting input will saturate and cause a loss of mirror
gain at mAcurrent levels—especially at high operating tem-
peratures.
Precautions should be taken to insure that the power supply
for the integrated circuit never becomes reversed in polarity
or that the unit is not inadvertently installed backwards in a
test socket as an unlimited current surge through the result-
ing forward diode within the IC could cause fusing of the in-
ternal conductors and result in a destroyed unit.
Output short circuits either to ground or to the positive power
supply should be of short time duration. Units can be de-
stroyed, 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 exces-
sive junction temperatures. For example, when operating
from a well-regulated +5 V
DC
power supply at T
A
=25˚C with
a 100 kΩshunt-feedback resistor (from the output to the in-
verting input) a short directly to the power supply will not
cause catastrophic failure but the current magnitude will be
approximately 50 mA and the junction temperature will be
above T
J
max. Larger feedback resistors will reduce the cur-
rent, 11 MΩprovides approximately 30 mA, an open circuit
provides 1.3 mA, and a direct connection from the output to
the non-inverting input will result in catastrophic failure when
the output is shorted to V
+
as this then places the
base-emitter junction of the input transistor directly across
the power supply. Short-circuits to ground will have magni-
tudes of approximately 30 mA and will not cause cata-
strophic failure at T
A
=25˚C.
Unintentional signal coupling from the output to the
non-inverting input can cause oscillations. This is likely only
in breadboard hook-ups with long component leads and can
be prevented by a more careful lead dress or by locating the
non-inverting input biasing resistor close to the IC. A quick
check of this condition is to bypass the non-inverting input to
ground with a capacitor. High impedance biasing resistors
used in the non-inverting input circuit make this input lead
highly susceptible to unintentional AC signal pickup.
Operation of this amplifier can be best understood by notic-
ing that input currents are differenced at the inverting-input
terminal and this difference current then flows through the
external feedback resistor to produce the output voltage.
Common-mode current biasing is generally useful to allow
operating with signal levels near ground or even negative as
this maintains the inputs biased at +V
BE
. Internal clamp tran-
sistors (Note 6) catch-negative input voltages at approxi-
mately −0.3 V
DC
but the magnitude of current flow has to be
limited by the external input network. For operation at high
temperature, this limit should be approximately 100 µA.
This new “Norton” current-differencing amplifier can be used
in most of the applications of a standard IC op amp. Perfor-
mance as a DC amplifier using only a single supply is not as
precise as a standard IC op amp operating with split supplies
but is adequate in many less critical applications. New func-
tions are made possible with this amplifier which are useful
in single power supply systems. For example, biasing can be
designed separately from the AC gain as was shown in the
“inverting amplifier,” the “difference integrator” allows con-
trolling the charging and the discharging of the integrating
capacitor with positive voltages, and the “frequency doubling
tachometer” provides a simple circuit which reduces the
ripple voltage on a tachometer output DC voltage.
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Typical Performance Characteristics
Open Loop Gain
DS007936-53
Voltage Gain
DS007936-54
Voltage Gain
DS007936-55
Input Current
DS007936-56
Supply Current
DS007936-57
Large Signal Frequency
Response
DS007936-58
Output Sink Current
DS007936-59
Output Class-A Bias Current
DS007936-60
Output Source Current
DS007936-61
Supply Rejection
DS007936-62
Mirror Gain
DS007936-63
Maximum Mirror Current
DS007936-64
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Typical Applications (V
+
=15 V
DC
)
Inverting Amplifier
DS007936-3
Triangle/Square Generator
DS007936-4
Frequency-Doubling Tachometer
DS007936-5
Low V
IN
−V
OUT
Voltage Regulator
DS007936-6
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Typical Applications (V
+
=15 V
DC
) (Continued)
Non-Inverting Amplifier
DS007936-7
Negative Supply Biasing
DS007936-8
Low-Drift Ramp and Hold Circuit
DS007936-10
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Typical Applications (V
+
=15 V
DC
) (Continued)
Bi-Quad Active Filter
(2nd Degree State-Variable Network)
DS007936-11
Q=50
fO=1 kHz
Voltage-Controlled Current Source
(Transconductance Amplifier)
DS007936-12
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Typical Applications (V
+
=15 V
DC
) (Continued)
Hi V
IN
,Lo(V
IN
−V
O
) Self-Regulator
DS007936-13
Q1 & Q2 absorb Hi VIN
Ground-Referencing a Differential Input Signal
DS007936-14
Voltage Regulator
DS007936-15
(VO=VZ+V
BE)
Fixed Current Sources
DS007936-16
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Typical Applications (V
+
=15 V
DC
) (Continued)
Voltage-Controlled Current Sink
(Transconductance Amplifier)
DS007936-17
Buffer Amplifier
DS007936-18
VIN ≥VBE
Tachometer
DS007936-19
VODC =Af
IN
* Allows VOto go to zero.
Low-Voltage Comparator
DS007936-20
No negative voltage limit if properly biased.
Power Comparator
DS007936-21
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Typical Applications (V
+
=15 V
DC
) (Continued)
Comparator
DS007936-22
Schmitt-Trigger
DS007936-23
Square-Wave Oscillator
DS007936-24
Pulse Generator
DS007936-25
Frequency Differencing Tachometer
DS007936-26
VODC =A(f
1−f
2
)
Frequency Averaging Tachometer
DS007936-27
VODC =A(f
1+f
2
)
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Typical Applications (V
+
=15 V
DC
) (Continued)
Squaring Amplifier (W/Hysteresis)
DS007936-28
Bi-Stable Multivibrator
DS007936-29
Differentiator (Common-Mode
Biasing Keeps Input at +V
BE
)
DS007936-30
“OR” Gate
DS007936-31
f=A+B+C
“AND” Gate
DS007936-32
f=A•B•C
Difference Integrator
DS007936-33
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Typical Applications (V
+
=15 V
DC
) (Continued)
Low Pass Active Filter
DS007936-34
fO=1 kHz
Staircase Generator
DS007936-35
V
BE
Biasing
DS007936-36
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Typical Applications (V
+
=15 V
DC
) (Continued)
Bandpass Active Filter
DS007936-37
fo=1 kHz
Q=25
Low-Frequency Mixer
DS007936-38
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Typical Applications (V
+
=15 V
DC
) (Continued)
Free-Running Staircase Generator/Pulse Counter
DS007936-39
Supplying I
IN
with Aux. Amp
(to Allow Hi-Z Feedback Networks)
DS007936-40
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Typical Applications (V
+
=15 V
DC
) (Continued)
One-Shot Multivibrator
DS007936-41
PW ≅2x10
6
C
* Speeds recovery.
Non-Inverting DC Gain to (0,0)
DS007936-42
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Typical Applications (V
+
=15 V
DC
) (Continued)
Channel Selection by DC Control (or Audio Mixer)
DS007936-43
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Typical Applications (V
+
=15 V
DC
) (Continued)
Power Amplifier
DS007936-44
One-Shot with DC Input Comparator
DS007936-45
Trips at VIN ≅0.8 V+
VIN must fall 0.8 V+prior to t2
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Typical Applications (V
+
=15 V
DC
) (Continued)
High Pass Active Filter
DS007936-46
Sample-Hold and Compare with New +V
IN
DS007936-47
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Typical Applications (V
+
=15 V
DC
) (Continued)
Sawtooth Generator
DS007936-48
Phase-Locked Loop
DS007936-49
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Typical Applications (V
+
=15 V
DC
) (Continued)
Split-Supply Applications (V
+
=+15 V
DC
&V
−
=−15 V
DC
)
Boosting to 300 mA Loads
DS007936-50
Non-Inverting DC Gain
DS007936-51
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Book
Extract
End
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Split-Supply Applications (V
+
=+15 V
DC
&V
−
=−15 V
DC
) (Continued)
AC Amplifier
DS007936-52
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Book
Extract
End
THIS PAGE IS IGNORED IN THE DATABOOK
PrintDate=1998/04/29 PrintTime=11:07:23 39954 ds007936 Rev. No. 3 cmserv Proof 22
22
Physical Dimensions inches (millimeters) unless otherwise noted
Small Outline Package (M)
Order Number LM3900M
NS Package Number M14A
Molded Dual-In-Line Package (N)
Order Number LM2900N, LM3900N or LM3301N
NS Package Number N14A
23 www.national.com 23
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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE-
VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI-
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1. Life support devices or systems are devices or sys-
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the body, or (b) support or sustain life, and whose fail-
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with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
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LM2900/LM3900/LM3301 Quad Amplifiers
PrintDate=1998/04/29 PrintTime=11:07:23 39954 ds007936 Rev. No. 3 cmserv Proof 24
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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