NSC LM310N, LM310J, LM310H, LM210J, LM110N Datasheet

November 1994

LM110/LM210/LM310 Voltage Follower

General Description

The LM110 series are monolithic operational amplifiers internally connected as unity-gain non-inverting amplifiers. They use super-gain transistors in the input stage to get low bias current without sacrificing speed. Directly interchangeable with 101, 741 and 709 in voltage follower applications, these devices have internal frequency compensation and provision for offset balancing.

The LM110 series are useful in fast sample and hold circuits, active filters, or as general-purpose buffers. Further, the frequency response is sufficiently better than standard IC amplifiers that the followers can be included in the feedback loop without introducing instability. They are plug-in replacements for the LM102 series voltage followers, offer-

ing lower offset voltage, drift, bias current and noise in addition to higher speed and wider operating voltage range.

The LM110 is specified over a temperature range b55§C s TA s a125§C, the LM210 from b25§C s TA s a85§C and the LM310 from 0§C s TA s a70§C.

Features

Y Input current		10 nA max over temperature
Y Small signal bandwidth		20 MHz
Y	Slew rate	30 V/ms
Y	Supply voltage range	g5V to g18V

Schematic Diagram

TL/H/7761 ± 1

Follower Voltage LM110/LM210/LM310

C1995 National Semiconductor Corporation

TL/H/7761

RRD-B30M115/Printed in U. S. A.

Absolute Maximum Ratings

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications.

(Note 6)

Supply Voltage	g18V
Power Dissipation (Note 1)	500 mW
Input Voltage (Note 2)	g15V
Output Short Circuit Duration (Note 3)	Indefinite
Operating Temperature Range	b55§C to a125§C
LM110
LM210	b25§C to a85§C
LM310	0§C to a70§C

Electrical Characteristics (Note 4)

Storage Temperature Range	b65§C to a150§C
Lead Temperature (Soldering, 10 sec.)	260§C
Soldering Information
Dual-In-Line Package	260§C
Soldering (10 sec.)
Small Outline Package	215§C
Vapor Phase (60 sec.)
Infrared (15 sec.)	220§C

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

ESD rating to be determined.

Parameter	Conditions			LM110			LM210			LM310		Units
			Min	Typ	Max	Min	Typ	Max	Min	Typ	Max
Input Offset Voltage	TA e 25§C			1.5	4.0		1.5	4.0		2.5	7.5	mV
Input Bias Current	TA e 25§C			1.0	3.0		1.0	3.0		2.0	7.0	nA
Input Resistance	TA e 25§C		1010	1012		1010	1012		1010	1012		X
Input Capacitance				1.5			1.5			1.5		pF
Large Signal Voltage	TA e 25§C, VS e g15V		0.999	0.9999		0.999	0.9999		0.999	0.9999		V/V
Gain	VOUT e g10V, RL e	8 kX
Output Resistance	TA e 25§C			0.75	2.5		0.75	2.5		0.75	2.5	X
Supply Current	TA e 25§C			3.9	5.5		3.9	5.5		3.9	5.5	mA
Input Offset Voltage					6.0			6.0			10	mV
Offset Voltage	b55§C s TA s a85§C			6			6					mV/§C
Temperature Drift	a85 s TA s 125§C			12								mV/§C
	0§C s TA s a70§C									10		mV/§C
Input Bias Current					10			10			10	nA
Large Signal Voltage	VS e g15V, VOUT e g10V		0.999			0.999			0.999			V/V
Gain	RL e 10 kX
Output Voltage	VS e g15V, RL e 10 kX		g10			g10			g10			V
Swing (Note 5)
Supply Current	TA e 125§C			2.0	4.0		2.0	4.0				mA
Supply Voltage	g5V s VS s g18V		70	80		70	80		70	80		dB
Rejection Ratio

Note 1: The maximum junction temperature of the LM110 is 150§C, of the LM210 is 100§C, and of the LM310 is 85§C. For operating at elevated temperatures, devices in the HO8 package must be derated based on a thermal resistance of 165§C/W, junction to ambient, or 22§C/W, junction to case. The thermal resistance of the dual-in-line package is 100§C/W, junction to ambient.

Note 2: For supply voltages less than g15V, the absolute maximum input voltage is equal to the supply voltage.

Note 3: Continuous short circuit for the LM110 and LM210 is allowed for case temperatures to 125§C and ambient temperatures to 70§C, and for the LM310, 70§C case temperature or 55§C ambient temperature. It is necessary to insert a resistor greater than 2 kX in series with the input when the amplifier is driven from low impedance sources to prevent damage when the output is shorted. RS e 5k min, 10k typical is recommended for dynamic stability in all applications.

Note 4: These specifications apply for g5V s VS s g18V and b55§C s TA 125§C for the LM110, b25§C s TA s 85§C for the LM210, and 0§C s TA s 70§C for the LM310 unless otherwise specified.

Note 5: Increased output swing under load can be obtained by connecting an external resistor between the booster and Vb terminals. See curve.

Note 6: Refer to RETS110X for LM110H, LM110J military specifications.

Application Hint

The input must be driven from a source impedance of typically 10 kX (5 kX min.) to maintain stability. The total source impedance will be reduced at high frequencies if there is stray capacitance at the input pin. In these cases, a 10 kX resistor should be inserted in series with the input, physically close to the input pin to minimize the stray capacitance and prevent oscillation.

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Typical Performance Characteristics (LM110/LM210)

		Large Signal Pulse
Input Current	Output Noise Voltage	Response

TL/H/7761 ± 28

3

Typical Performance Characteristics (LM310)

		Large Signal Pulse
Input Current	Output Noise Voltage	Response

TL/H/7761 ± 29

4

Auxiliary Circuits

Offset Balancing Circuit

Increasing Negative Swing Under Load

TL/H/7761 ± 3

TL/H/7761 ± 2

*May be added to reduce internal dissipation

Typical Applications

Differential Input Instrumentation Amplifier

R4 e R5

R2 R3

AV e R4

R2

TL/H/7761 ± 4

Fast Integrator with Low Input Current

TL/H/7761 ± 5

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