LM110/LM210/LM310 Voltage Follower
November 1994
LM110/LM210/LM310 Voltage Follower
General Description
The LM110 series are monolithic operational amplifiers in- ing lower offset voltage, drift, bias current and noise in addi-
ternally connected as unity-gain non-inverting amplifiers. tion to higher speed and wider operating voltage range.
They use super-gain transistors in the input stage to get low The LM110 is specified over a temperature range b55§ C s
bias current without sacrificing speed. Directly interchange- TA s a 125§ C, the LM210 from b25§ C s TA s a 85§ C and
able with 101, 741 and 709 in voltage follower applications, the LM310 from 0§ C s TA s a 70§ C.
these devices have internal frequency compensation and
provision for offset balancing.
Features
The LM110 series are useful in fast sample and hold cir- Y Input current 10 nA max over temperature
cuits, active filters, or as general-purpose buffers. Further, Y Small signal bandwidth 20 MHz
the frequency response is sufficiently better than standard Y Slew rate 30 V/ms
IC amplifiers that the followers can be included in the feed-
back loop without introducing instability. They are plug-in
Y Supply voltage range g 5V to g 18V
replacements for the LM102 series voltage followers, offer-
Schematic Diagram
TL/H/7761 – 1
C1995 National Semiconductor Corporation TL/H/7761 RRD-B30M115/Printed in U. S. A.
Absolute Maximum Ratings
If Military/Aerospace specified devices are required, Storage Temperature Range b 65§ C to a 150§ C
please contact the National Semiconductor Sales Lead Temperature (Soldering, 10 sec.) 260§ C
Office/Distributors for availability and specifications.
Soldering Information
(Note 6)
Dual-In-Line Package
Supply Voltage g 18V Soldering (10 sec.) 260§ C
Power Dissipation (Note 1) 500 mW Small Outline Package
Input Voltage (Note 2) g 15V Vapor Phase (60 sec.) 215§ C
Infrared (15 sec.) 220§ C
Output Short Circuit Duration (Note 3) Indefinite
See AN-450 ‘‘Surface Mounting Methods and Their Effect
Operating Temperature Range
on Product Reliability’’ for other methods of soldering sur-
LM110 b 55§ C to a 125§ C
face mount devices.
LM210 b 25§ C to a 85§ C
LM310 0§ C to a 70§ C ESD rating to be determined.
Electrical Characteristics (Note 4)
LM110 LM210 LM310
Parameter Conditions 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 g 15V
0.999 0.9999 0.999 0.9999 0.999 0.9999 V/V
Gain VOUT e g 10V, 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 b 55§ C s TA s a 85§ C 6 6 mV/§ C
Temperature Drift a 85 s TA s 125§ C 12 mV/§ C
0§ C s TA s a 70§ C 10 mV/§ C
Input Bias Current 10 10 10 nA
Large Signal Voltage VS e g 15V, VOUT e g 10V
0.999 0.999 0.999 V/V
Gain RL e 10 kX
Output Voltage VS e g 15V, RL e 10 kX
g 10 g 10 g 10 V
Swing (Note 5)
Supply Current TA e 125§ C 2.0 4.0 2.0 4.0 mA
Supply Voltage g 5V s VS s g 18V
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 g 15V, 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 g 5V s VS s g 18V and b 55§ C s TA 125§ C for the LM110, b 25§ C s TA s 85§ C for the LM210, and 0§ C s TA s 70§ C for
the LM310 unless otherwise specified.
b
Note 5: Increased output swing under load can be obtained by connecting an external resistor between the booster and V 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.
2
Typical Performance Characteristics (LM110/LM210)
Large Signal Pulse
Input Current Output Noise Voltage Response
Voltage Gain and Voltage Gain and
Phase Lag Phase Lag Voltage Gain
Output Resistance Symmetrical Output Swing Positive Output Swing
Large Signal
Frequency Response Power Supply Rejection Supply Current
TL/H/7761 – 28
3
Typical Performance Characteristics (LM310)
Large Signal Pulse
Input Current Output Noise Voltage Response
Voltage Gain and Voltage Gain and
Phase Lag Phase Lag Voltage Gain
Output Resistance Symmetrical Output Swing Positive Output Swing
Large Signal
Frequency Response Power Supply Rejection Supply Current
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 R5
e
R2 R3
R4
AV e
R2
TL/H/7761 – 4
Fast Integrator with Low Input Current
TL/H/7761 – 5
5
Typical Applications (Continued)
Fast Inverting Amplifier with High Input Impedance
TL/H/7761 – 6
Comparator for Signals of Opposite Polarity
TL/H/7761 – 7
Zero Crossing Detector
TL/H/7761 – 9
6
Typical Applications (Continued)
Driver for A/D Ladder Network
TL/H/7761 – 8
Buffer for Analog Switch*
TL/H/7761 – 10
*Switch substrates are boot-strapped to reduce output capacitance of switch.
7
Typical Applications (Continued)
Comparator for AC Coupled Signals
TL/H/7761 – 11
High Input Impedance AC Amplifier
TL/H/7761 – 12
Comparator for A/D Converter Using a Binary-Weighted Network
TL/H/7761 – 13
8
Typical Applications (Continued)
Bilateral Current Source
R3 VIN
IOUT e
R1 R5
R3 e R4 a R5
R1 e R2
TL/H/7761 – 14
Comparator for A/D Converter Using a Ladder Network
TL/H/7761 – 15
Sine Wave Oscillator
fo e 10 kHz
TL/H/7761 – 16
9
Typical Applications (Continued)
Low Pass Active Filter
TL/H/7761 – 18
*Values are for 10 kHz cutoff. Use silvered mica capacitors for good temperature stability.
High Pass Active Filter
TL/H/7761 – 19
*Values are for 100 Hz cutoff. Use metalized polycarbonate capacitors for good temperature stability.
Simulated Inductor
TL/H/7761 – 21
10
Typical Applications (Continued)
Adjustable Q Notch Filter
1
fo e
2qR1C1
R1 e R2 e 2R3
C1 e C2 e C3/2
TL/H/7761 – 22
Bandpass Filter
TL/H/7761 – 23
Sample and Hold
TL/H/7761 – 24
² Use capacitor with polycarbonate teflon or polythylene dietetric
11
Typical Applications (Continued)
Buffered Reference Source
TL/H/7761 – 25
Low Drift Sample and Hold*
² Teflon polyethylene or polycarbonate dielectric capacitor
*Worst case drift less than 3 mV/sec TL/H/7761 – 26
Variable Capacitance Multiplier
#1 JC
Rb
Ce a 1
Ra
TL/H/7761 – 27
12
Connection Diagrams
Metal Can Package
TL/H/7761 – 30
b
Package is connected to Pin 4 (V )
Top View
Order Number LM110H, LM210H or LM310H
LM110H/883*
See NS Package Number H08C
Dual-In-Line Package Dual-In-Line Package
TL/H/7761 – 32
Top View
TL/H/7761 – 31
Order Number LM310M, LM310N or LM110J-8/883*
Top View See NS Package Number J08A, M08A or N08E
Order Number LM110J, LM210J,
LM310J or LM110J/883*
See NS Package Number J14A
*Available per SMDÝ 5962-8760601
13
Physical Dimensions inches (millimeters)
Metal Can Package (H)
Order Number LM110H, LM110H/883, LM210H or LM310H
NS Package Number H08C
Dual-In-Line Package (J)
Order Number LM110J-8/883
NS Package Number J08A
14
Physical Dimensions inches (millimeters) (Continued)
Ceramic Dual-In-Line Package (J)
Order Number LM110J/883
NS Package Number J14A
S.O. Package (M)
Order Number LM310M
NS Package Number M08A
15
LM110/LM210/LM310 Voltage Follower
Physical Dimensions inches (millimeters) (Continued)
Molded Dual-In-Line Package (N)
Order Number LM310N
NS Package Number N08E
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