LM2900

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TLH7936

LM2900LM

3900LM3301QuadAmplifiers

February 1995

LM2900LM3900LM3301 Quad Amplifiers

General DescriptionThe LM2900 series consists of four independent dual inputinternally compensated amplifiers which were designedspecifically to operate off of a single power supply voltage

and to provide a large output voltage swing These amplifi-ers make use of a current mirror to achieve the non-invert-

ing input function Application areas include ac amplifiersRC active filters low frequency triangle squarewave andpulse waveform generation circuits tachometers and low

speed high voltage digital logic gates

FeaturesY Wide single supply voltage 4 VDC to 32 VDC

Range or dual supplies g2 VDC to g16 VDCY Supply current drain independent of supply voltageY Low input biasing current 30 nAY High open-loop gain 70 dBY Wide bandwidth 25 MHz (unity gain)Y Large output voltage swing (V

a b 1) Vp-pY Internally frequency compensated for unity gainY Output short-circuit protection

Schematic and Connection Diagrams

TLH79361

Dual-In-Line and SO

TLH79362

Top View

Order Number LM2900N LM3900M LM3900N or LM3301N

See NS Package Number M14A or N14A

C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A

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Absolute Maximum RatingsIf MilitaryAerospace specified devices are required please contact the National Semiconductor Sales OfficeDistributors for availability and specifications

LM2900LM3900 LM3301

Supply Voltage 32 VDC 28 VDCg16 VDC g14 VDC

Power Dissipation (TA e 25C) (Note 1)

Molded DIP 1080 mW 1080 mWSO Package 765 mW

Input Currents IINa

or IINb

20 mADC 20 mADC

Output Short-Circuit DurationOne Amplifier Continuous ContinuousTA e 25C (See Application Hints)

Operating Temperature Range b40C to a85CLM2900 b40C to a85CLM3900 0C to a70C

Storage Temperature Range b65C to a150C b65C to a150C

Lead Temperature (Soldering 10 sec) 260C 260C

Soldering InformationDual-In-Line Package

Soldering (10 sec) 260C 260CSmall Outline Package

Vapor Phase (60 sec) 215C 215CInfrared (15 sec) 220C 220C

See AN-450 Surface Mounting Methods and Their Effect on Product Reliability for other methods of soldering surface mount

devices

ESD tolerance (Note 7) 2000V 2000V

Electrical Characteristics TA e 25C Va e 15 VDC unless otherwise stated

Parameter ConditionsLM2900 LM3900 LM3301

UnitsMin Typ Max Min Typ Max Min Typ Max

Open Voltage Gain Over TempVmVLoop

Voltage GainDVO e 10 VDC 12 28 12 28 12 28

Input ResistanceInverting Input

1 1 1 MX

Output Resistance 8 8 9 kX

Unity Gain Bandwidth Inverting Input 25 25 25 MHz

I np ut Bi as Cu rren t I nve rti ng I npu t Va e 5 VDC 30 200 30 200 30 300 nA

Inverting Input

Slew Rate Positive Output Swing 05 05 05Vms

Negative Output Swing 20 20 20

Supply Current RL e % On All Amplifiers 62 10 62 10 62 10 mADC

Output VOUT High RL e 2k IINb e 0

135 135 135Voltage V

a e 150 VDC IINa e 0

SwingVOUT Low IIN

b e 10 mA009 02 009 02 009 02

IINa e 0 VDC

VOUT High Va e Absolute IIN

b e 0

Maximum Ratings IINa e 0 295 295 260

RL e %

Output Source 6 18 6 10 5 18

CurrentSink (Note 2) 05 13 05 13 05 13 mADC

CapabilityISINK VOL e 1V IIN

b e 5 mA 5 5 5

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Electrical Characteristics (Note 6) Va e 15 VDC unless otherwise stated (Continued)

Parameter ConditionsLM2900 LM3900 LM3301

UnitsMin Typ Max Min Typ Max Min Typ Max

Power Supply Rejection TA e 25C f e 100 Hz 70 70 70 dB

Mirror Gain 20 mA (Note 3) 090 10 11 090 10 11 090 1 110mAmA

200 mA (Note 3) 090 10 11 090 10 11 090 1 110DMirror Gain 20 mA to 200 mA (Note 3) 2 5 2 5 2 5 %

Mirror Current (Note 4) 10 500 10 500 10 500 mADC

Negative Input Current TA e 25C (Note 5) 10 10 10 mADC

Input Bias Current Inverting Input 300 300 nA

Note 1 For operating at high temperatures the device must be derated based on a 125C maximum junction temperature and a thermal resistance of 92CWwhich applies for the device soldered in a printed circuit board operating in a still air ambient Thermal resistance for the SO package is 131CW

Note 2 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

Characteristics

Note 3 This spec indicates the current gain of the current mirror which is used as the non-inverting input

Note 4 Input VBE match between the non-inverting and the inverting inputs occurs for a mirror current (non-inverting input current) of approximately 10mA This is

therefore a typical design center for many of the application circuits

Note 5 Clamp transistors are included on the IC to prevent the input voltages from swinging below ground more than approximately b03 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

input voltages see for example the Differentiator Circuit in the applications section

Note 6 These specs apply for b40C s TA s a85C unless otherwise stated

Note 7 Human body model 15 kX in series with 100 pF

Application HintsWhen driving either input from a low-impedance source a

limiting resistor should be placed in series with the inputlead to limit the peak input current Currents as large as

20 mA will not damage the device but the current mirror onthe non-inverting input will saturate and cause a loss of mir-ror gain at mA current levelsespecially at high operating

temperatures

Precautions should be taken to insure that the power supplyfor the integrated circuit never becomes reversed in polarity

or that the unit is not inadvertently installed backwards in atest socket as an unlimited current surge through the result-ing forward diode within the IC could cause fusing of the

internal conductors and result in a destroyed unit

Output short circuits either to ground or to the positive pow-er supply should be of short time duration Units can be

destroyed not as a result of the short circuit current causingmetal fusing but rather due to the large increase in IC chipdissipation which will cause eventual failure due to exces-

sive junction temperatures For example when operatingfrom a well-regulated a5 VDC power supply at TA e 25Cwith a 100 kX shunt-feedback resistor (from the output tothe inverting input) a short directly to the power supply will

not cause catastrophic failure but the current magnitude willbe approximately 50 mA and the junction temperature willbe above TJ max Larger feedback resistors will reduce the

current 11 MX provides approximately 30 mA an open cir-cuit provides 13 mA and a direct connection from the out-

put to the non-inverting input will result in catastrophic fail-ure when the output is shorted to V

aas this then places the

base-emitter junction of the input transistor directly acrossthe power supply Short-circuits to ground will have magni-

tudes of approximately 30 mA and will not cause cata-strophic failure at TA e 25C

Unintentional signal coupling from the output to the non-in-

verting input can cause oscillations This is likely only inbreadboard hook-ups with long component leads and can

be prevented by a more careful lead dress or by locating thenon-inverting input biasing resistor close to the IC A quickcheck of this condition is to bypass the non-inverting input

to ground with a capacitor High impedance biasing resis-tors used in the non-inverting input circuit make this inputlead 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-inputterminal and this difference current then flows through the

external feedback resistor to produce the output voltage

Common-mode current biasing is generally useful to allowoperating with signal levels near ground or even negative asthis maintains the inputs biased at aVBE Internal clamp

transistors (see note 5) catch-negative input voltages at ap-proximatelyb03 VDC but the magnitude of current flow hasto be limited by the external input network For operation at

high temperature this limit should be approximately 100 mA

This new Norton current-differencing amplifier can beused in most of the applications of a standard IC op amp

Performance as a DC amplifier using only a single supply isnot as precise as a standard IC op amp operating with splitsupplies but is adequate in many less critical applications

New functions are made possible with this amplifier whichare useful in single power supply systems For example

biasing can be designed separately from the AC gain as wasshown in the inverting amplifier the difference integra-tor allows controlling the charging and the discharging of

the integrating capacitor with positive voltages and the fre-

quency doubling tachometer provides a simple circuitwhich reduces the ripple voltage on a tachometer output DCvoltage

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Typical Performance Characteristics

Open Loop Gain Voltage Gain Voltage Gain

Input Current Supply Current ResponseLarge Signal Frequency

Ou tpu t S ink Cu rr ent Out put Class-A Bias Cur rent Ou tpu t S ou rce Cur rent

Supply Rejection Mirror Gain Maximum Mirror Current

TLH79369

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Typical Applications (Va e 15 VDC)

Inverting Amplifier

VODCeVa

2

AV j bR2

R1TLH79363

TriangleSquare Generator

TLH79364

Frequency-Doubling Tachometer

TLH79365

Low VINb VOUT Voltage Regulator

TLH79366

Non-Inverting Amplifier

VODC eVa

2

AV jR2

R1

TLH79367

Negative Supply Biasing

VODCeR2

R3Vb

TLH79368AV j

R2

R1

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Typical Applications (Va e 15 VDC) (Continued)

Low-Drift Ramp and Hold Circuit

TLH793610

Bi-Quad Active Filter(2nd Degree State-Variable Network)

TLH793611

Q e 50

fO e 1 kHz

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Voltage-Controlled Current Source(Transconductance Amplifier)

TLH793612

Hi VIN Lo (VINb VO) Self-Regulator

Q1 Q2 absorb Hi VIN

TLH793613

Ground-Referencing a Differential Input Signal

TLH793614

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Voltage Regulator

(VO e VZ a VBE)

TLH793615

Fixed Current Sources

I2 eR1

R2I1 TLH793616

Voltage-Controlled Current Sink(Transconductance Amplifier)

TLH793617

Buffer Amplifier

VIN t VBE

TLH793618

Tachometer

TLH793619

VODC e A f IN

Allows VO to go to zero

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Low-Voltage Comparator

No negative voltage limit i f

properly biased

TLH793620

Power Comparator

TLH793621

Comparator

TLH793622

Schmitt-Trigger

TLH793623

Square-Wave Oscillator

TLH793624

Pulse Generator

TLH793625

Frequency Differencing Tachometer

VODCe A (f1b f2)

TLH793626

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Typical Applications (Va e 15 VDC) (Continued)Frequency Averaging Tachometer

VODCe A (f1 a f2)

TLH793627

Squaring Amplifier (WHysteresis)

TLH793628

Bi-Stable Multivibrator

TLH793629

Differentiator (Common-Mode

Biasing Keeps Input at aVBE)

AV e1

2

TLH793630

OR Gate

f e A a B a C

TLH793631

AND Gate

f e A B C

TLH793632

Difference Integrator

TLH793633

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Low Pass Active Filter

fO e 1 kHz

TLH793634

Staircase Generator

TLH793635

VBE Biasing

AV j bR2

R1

TLH793636

Bandpass Active Filter

TLH793637

fo e 1 kHz

Q e 25

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Low-Frequency Mixer

TLH793638

Free-Running Staircase GeneratorPulse Counter

TLH793639

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Supplying IIN with Aux Amp

(to Allow Hi-Z Feedback Networks)

TLH793640

One-Shot Multivibrator

PW j 2 c 106C

Speeds recovery

TLH793641

Non-Inverting DC Gain to (00)

TLH793642

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Channel Selection by DC Control (or Audio Mixer)

TLH793643

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Typical Applications (Va e 15 VDC) (Continued)Power Amplifier

TLH793644

One-Shot with DC Input Comparator

TLH793645

Trips at VIN j 08 Va

VIN must fall 08 Va prior to t2

High Pass Active Filter

TLH793646

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Sample-Hold and Compare with New aVIN

TLH793647

Sawtooth Generator

TLH793648

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Phase-Locked Loop

TLH793649

Boosting to 300 mA Loads

TLH793650

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Split-Supply Applications (Va e a15 VDC Vb e b15 VDC)

Non-Inverting DC Gain

TLH793651

AC Amplifier

TLH793652

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Physical Dimensions inches (millimeters)

Small Outline Package (M)

Order Number LM3900MNS Package Number M14A

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LM2900LM3900LM3301QuadAmplifiers

Physical Dimensions inches (millimeters) (Continued)

Molded Dual-In-Line Package (N)Order Number LM2900N LM3900N or LM3301N

NS Package Number N14A

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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONALSEMICONDUCTOR CORPORATION As used herein

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into the body or (b) support or sustain life and whose be reasonably expected to cause the failure of the lifefailure to perform when properly used in accordance support device or system or to affect its safety or

with instructions for use provided in the labeling can effectivenessbe reasonably expected to result in a significant injuryto the user

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LM2900

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