LMC7111
LMC7111 Tiny CMOS Operational Amplifier with Rail-to-Rail Input and Output
Literature Number: SNOS753D
LMC7111
Tiny CMOS Operational Amplifier with Rail-to-Rail Input
and Output
General Description
The LMC7111 is a micropower CMOS operational amplifier
available in the space saving SOT 23-5 package. This
makes the LMC7111 ideal for space and weight critical de-
signs. The wide common-mode input range makes it easy to
design battery monitoring circuits which sense signals above
the V
+
supply. The main benefits of the Tiny package are
most apparent in small portable electronic devices, such as
mobile phones, pagers, and portable computers. The tiny
amplifiers can be placed on a board where they are needed,
simplifying board layout.
Features
nTiny 5-Pin SOT23 package saves space
nVery wide common mode input range
nSpecified at 2.7V, 5V, and 10V
nTypical supply current 25 µA at 5V
n50 kHz gain-bandwidth at 5V
nSimilar to popular LMC6462
nOutput to within 20 mV of supply rail at 100k load
nGood capacitive load drive
Applications
nMobile communications
nPortable computing
nCurrent sensing for battery chargers
nVoltage reference buffering
nSensor interface
nStable bias for GaAs RF amps
Connection Diagrams
8-Pin MDIP 5-Pin SOT23
01235201
Top View
01235202
Top View
Actual Size
01235219
Ordering Information
Package Part Number Package Marking Transport Media NSC Drawing
8-Pin MDIP LMC7111AIN LMC7111AIN 40 Units/Rail N08E
LMC7111BIN LMC7111BIN 40 Units/Rail
5-Pin SOT23 LMC7111BIM5 A01B 1k units Tape and Reel MF05A
LMC7111BIM5X 3k Units Tape and Reel
June 2006
LMC7111 Tiny CMOS Operational Amplifier with Rail-to-Rail Input and Output
© 2006 National Semiconductor Corporation DS012352 www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
ESD Tolerance (Note 2)
SOT23 Package 2000V
MDIP Package 1500V
Differential Input Voltage ±Supply Voltage
Voltage at Input/Output Pin (V
+
) + 0.3V, (V
−
) − 0.3V
Supply Voltage (V
+
−V
−
)11V
Current at Input Pin ±5mA
Current at Output Pin (Note 3) ±30 mA
Current at Power Supply Pin 30 mA
Lead Temp. (Soldering, 10 sec.) 260˚C
Storage Temperature Range −65˚C to +150˚C
Junction Temperature (Note 4) 150˚C
Operating Ratings (Note 1)
Supply Voltage 2.5V ≤V
+
≤11V
Junction Temperature Range
LMC7111AI, LMC7111BI −40˚C ≤T
J
≤+85˚C
Thermal Resistance (θ
JA
)
8-Pin MDIP 115˚C/W
5-Pin SOT23 325˚C/W
2.7V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= 2.7V, V
−
= 0V, V
CM
=V
O
=V
+
/2 and R
L
>1MΩ.Bold-
face limits apply at the temperature extremes.
Typ LMC7111AI LMC7111BI
Symbol Parameter Conditions (Note 5) Limit Limit Units
(Note 6) (Note 6)
V
OS
Input Offset Voltage V
+
= 2.7V 0.9 3 7 mV
59max
TCV
OS
Input Offset Voltage 2.0 µV/˚C
Average Drift
I
B
Input Bias Current (Note 9) 0.1 1 1 pA
20 20 max
I
OS
Input Offset Current (Note 9) 0.01 0.5 0.5 pA
10 10 max
R
IN
Input Resistance >10 Tera Ω
+PSRR Positive Power Supply 2.7V ≤V
+
≤5.0V, 60 55 55 dB
Rejection Ratio V
−
= 0V, V
O
= 2.5V 50 50 min
−PSRR Negative Power Supply −2.7V ≤V
−
≤−5.0V, 60 55 55 dB
Rejection Ratio V
−
= 0V, V
O
= 2.5V 50 50 min
V
CM
Input Common-Mode V
+
= 2.7V −0.10 0.0 0.0 V
Voltage Range For CMRR ≥50 dB 0.40 0.40 min
2.8 2.7 2.7 V
2.25 2.25 max
C
IN
Common-Mode Input 3 pF
Capacitance
V
O
Output Swing V
+
= 2.7V 2.69 2.68 2.68 V
R
L
= 100 kΩ2.4 2.4 min
0.01 0.02 0.02 V
0.08 0.08 max
V
+
= 2.7V 2.65 2.6 2.6 V
R
L
=10kΩ2.4 2.4 min
0.03 0.1 0.1 V
0.3 0.3 max
I
SC
Output Short Circuit Sourcing, V
O
=0V 7 1 1 mA
Current 0.7 0.7 min
Sinking, V
O
= 2.7V 7 1 1 mA
0.7 0.7 min
LMC7111
www.national.com 2
2.7V DC Electrical Characteristics (Continued)
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= 2.7V, V
−
= 0V, V
CM
=V
O
=V
+
/2 and R
L
>1MΩ.Bold-
face limits apply at the temperature extremes.
Typ LMC7111AI LMC7111BI
Symbol Parameter Conditions (Note 5) Limit Limit Units
(Note 6) (Note 6)
A
VOL
Voltage Gain Sourcing 400 V/mv
min
Sinking 150 V/mv
min
I
S
Supply Current V
+
= +2.7V, 20 45 50 µA
V
O
=V
+
/2 60 65 max
2.7V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= 2.7V, V
−
= 0V, V
CM
=V
O
=V
+
/2 and R
L
>1MΩ.Bold-
face limits apply at the temperature extremes.
Typ LMC7111AI LMC7111BI
Symbol Parameter Conditions (Note 5) Limit Limit Units
(Note 6) (Note 6)
SR Slew Rate (Note 8) 0.015 V/µs
GBW Gain-Bandwidth Product 40 kHz
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.
Note 2: Human Body Model is 1.5 kΩin series with 100 pF.
Note 3: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the
maximum allowed junction temperature at 150˚C.
Note 4: The maximum power dissipation is a function of TJ(MAX),θJA and TA. The maximum allowable power dissipation at any ambient temperature is PD=
(TJ(MAX) −T
A)/θJA. All numbers apply for packages soldered directly into a PC board.
Note 5: Typical Values represent the most likely parametric norm.
Note 6: All limits are guaranteed by testing or statistical analysis.
Note 7: V+= 2.7V, VCM = 1.35V and RLconnected to 1.35V. For Sourcing tests, 1.35V ≤VO≤2.7V. For Sinking tests, 0.5V ≤VO≤1.35V.
Note 8: Connected as Voltage Follower with 1.0V step input. Number specified is the slower of the positive and negative slew rates. Input referred, V+= 2.7V and
RL= 100 kΩconnected to 1.35V. Amp excited with 1 kHz to produce VO=1V
PP.
Note 9: Bias Current guaranteed by design and processing.
3V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= 3V, V
−
= 0V, V
CM
=V
O
=V
+
/2 and R
L
>1MΩ.Boldface
limits apply at the temperature extremes.
Typ LMC7111AI LMC7111BI
Symbol Parameter Conditions (Note 5) Limit Limit Units
(Note 6) (Note 6)
V
CM
Input Common-Mode V
+
= 3V −0.25 0.0 0.0 V
Voltage Range For CMRR ≥50 dB min
3.2 3.0 3.0 V
2.8 2.8 max
LMC7111
www.national.com3
3.3V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= 3.3V, V
−
= 0V, V
CM
=V
O
=V
+
/2 and R
L
>1MΩ.Bold-
face limits apply at the temperature extremes.
Typ LMC7111AI LMC7111BI
Symbol Parameter Conditions (Note 5) Limit Limit Units
(Note 6) (Note 6)
V
CM
Input Common-Mode V
+
= 3.3V −0.25 −0.1 −0.1 V
Voltage Range For CMRR ≥50 dB 0.00 0.00 min
3.5 3.4 3.4 V
3.2 3.2 max
5V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= 5V, V
−
= 0V, V
CM
=V
O
=V
+
/2 and R
L
>1MΩ.Boldface
limits apply at the temperature extremes.
Typ LMC7111AI LMC7111BI
Symbol Parameter Conditions (Note 5) Limit Limit Units
(Note 6) (Note 6)
V
OS
Input Offset Voltage V
+
= 5V 0.9 mV
max
TCV
OS
Input Offset Voltage 2.0 µV/˚C
Average Drift
I
B
Input Bias Current (Note 9) 0.1 1 1 pA
20 20 max
I
OS
Input Offset Current (Note 9) 0.01 0.5 0.5 pA
10 10 max
R
IN
Input Resistance >10 Tera Ω
CMRR Common Mode 0V ≤V
CM
≤5V 85 70 60 dB
Rejection Ratio min
+PSRR Positive Power Supply 5V ≤V
+
≤10V, 85 70 60 dB
Rejection Ratio V
−
= 0V, V
O
= 2.5V min
−PSRR Negative Power Supply −5V ≤V
−
≤−10V, 85 70 60 dB
Rejection Ratio V
−
= 0V, V
O
= −2.5V min
V
CM
Input Common-Mode V
+
= 5V −0.3 −0.20 −0.20 V
Voltage Range For CMRR ≥50 dB 0.00 0.00 min
5.25 5.20 5.20 V
5.00 5.00 max
C
IN
Common-Mode Input 3 pF
Capacitance
V
O
Output Swing V
+
= 5V 4.99 4.98 4.98 Vmin
R
L
= 100 kΩ0.01 0.02 0.02 Vmax
V
+
= 5V 4.98 4.9 4.9 Vmin
R
L
=10kΩ0.02 0.1 0.1 Vmin
I
SC
Output Short Circuit Sourcing, V
O
=0V 7 5 5 mA
Current 3.5 3.5 min
Sinking, V
O
=3V 7 5 5 mA
3.5 3.5 min
A
VOL
Voltage Gain Sourcing 500 V/mv
min
Sinking 200 V/mv
min
I
S
Supply Current V
+
= +5V, 25 µA
V
O
=V
+
/2 max
LMC7111
www.national.com 4
5V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= 5V, V
−
= 0V, V
CM
=V
O
=V
+
/2 and R
L
>1MΩ.Boldface
limits apply at the temperature extremes.
Typ LMC7111AI LMC7111BI
Symbol Parameter Conditions (Note 5) Limit Limit Units
(Note 6) (Note 6)
SR Slew Rate Positive Going Slew Rate 0.027 0.015 0.010 V/µs
(Note 8)
GBW Gain-Bandwidth Product 50 kHz
Note 10: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.
Note 11: Human body model, 1.5 kΩin series with 100 pF.
Note 12: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the
maximum allowed junction temperature at 150˚C.
Note 13: The maximum power dissipation is a function of TJ(max),θJA and TA. The maximum allowable power dissipation at any ambient temperature is PD=
(TJ(max) −T
A)/θJA. All numbers apply for packages soldered directly into a PC board.
Note 14: Typical Values represent the most likely parametric norm.
Note 15: All limits are guaranteed by testing or statistical analysis.
Note 16: V+=5V,V
CM = 2.5V and RLconnected to 2.5V. For Sourcing tests, 2.5V ≤VO≤5.0V. For Sinking tests, 0.5V ≤VO≤2.5V.
Note 17: Connected as Voltage Follower with 1.0V step input. Number specified is the slower of the positive slew rate. The negative slew rate is faster. Input
referred, V+= 5V and RL= 100 kΩconnected to 1.5V. Amp excited with 1 kHz to produce VO=1V
PP.
Note 18: Bias Current guaranteed by design and processing.
10V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= 10V, V
−
= 0V, V
CM
=V
O
=V
+
/2 and R
L
>1MΩ.Bold-
face limits apply at the temperature extremes.
Typ LMC7111AI LMC7111BI
Symbol Parameter Conditions (Note 5) Limit Limit Units
(Note 6) (Note 6)
V
OS
Input Offset Voltage V
+
= 10V 0.9 3 7 mV
59max
TCV
OS
Input Offset Voltage 2.0 µV/˚C
Average Drift
I
B
Input Bias Current 0.1 1 1 pA
20 20 max
I
OS
Input Offset Current 0.01 0.5 0.5 pA
10 10 max
R
IN
Input Resistance >10 Tera Ω
+PSRR Positive Power Supply 5V ≤V
+
≤10V, 80 dB
Rejection Ratio V
−
= 0V, V
O
= 2.5V min
−PSRR Negative Power Supply −5V ≤V
−
≤−10V, 80 dB
Rejection Ratio V
−
= 0V, V
O
= 2.5V min
V
CM
Input Common-Mode V
+
= 10V −0.2 −0.15 −0.15 V
Voltage Range For CMRR ≥50 dB 0.00 0.00 min
10.2 10.15 10.15 V
10.00 10.00 max
C
IN
Common-Mode Input 3 pF
Capacitance
I
SC
Output Short Circuit Sourcing, V
O
=0V 30 20 20 mA
Current (Note 9) 77min
Sinking, V
O
= 10V 30 20 20 mA
77min
LMC7111
www.national.com5
10V DC Electrical Characteristics (Continued)
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= 10V, V
−
= 0V, V
CM
=V
O
=V
+
/2 and R
L
>1MΩ.Bold-
face limits apply at the temperature extremes.
Typ LMC7111AI LMC7111BI
Symbol Parameter Conditions (Note 5) Limit Limit Units
(Note 6) (Note 6)
A
VOL
Voltage Gain Sourcing 500 V/mv
100 kΩLoad min
Sinking 200 V/mv
min
I
S
Supply Current V
+
= +10V, 25 50 60 µA
V
O
=V
+
/2 65 75 max
V
O
Output Swing V
+
= 10V 9.99 9.98 9.98 Vmin
R
L
= 100 kΩ0.01 0.02 0.02 Vmax
V
+
= 10V 9.98 9.9 9.9 Vmin
R
L
=10kΩ0.02 0.1 0.1 Vmin
10V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= 10V, V
−
= 0V, V
CM
=V
O
=V
+
/2 and R
L
>1MΩ.Bold-
face limits apply at the temperature extremes.
Typ LMC7111AI LMC7111BI
Symbol Parameter Conditions (Note 5) Limit Limit Units
(Note 6) (Note 6)
SR Slew Rate (Note 8) 0.03 V/µs
GBW Gain-Bandwidth Product 50 kHz
φ
m
Phase Margin 50 deg
G
m
Gain Margin 15 dB
Input-Referred f = 1 kHz 110
Voltage Noise V
CM
=1V
Input-Referred f = 1 kHz 0.03
Current Noise
Note 19: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.
Note 20: Human body model, 1.5 kΩin series with 100 pF.
Note 21: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the
maximum allowed junction temperature at 150˚C.
Note 22: The maximum power dissipation is a function of TJ(max),θJA and TA. The maximum allowable power dissipation at any ambient temperature is PD=
(TJ(max) −T
A)/θJA. All numbers apply for packages soldered directly into a PC board.
Note 23: Typical Values represent the most likely parametric norm.
Note 24: All limits are guaranteed by testing or statistical analysis.
Note 25: V+= 10V, VCM = 5V and RLconnected to 5V. For Sourcing tests, 5V ≤VO≤10V. For Sinking tests, 0.5V ≤VO≤5V.
Note 26: Connected as Voltage Follower with 1.0V step input. Number specified is the slower of the positive and negative slew rates. Input referred, V+= 10V and
RL= 100 kΩconnected to 5V. Amp excited with 1 kHz to produce VO=2V
PP.
Note 27: Operation near absolute maximum limits will adversely affect reliability.
LMC7111
www.national.com 6
Typical Performance Characteristics
T
A
= 25˚C unless specified, Single Supply
Supply Current vs. Supply Voltage Voltage Noise vs. Frequency
01235203
01235204
2.7V Performance
Offset Voltage vs. Common Mode Voltage @2.7V Sinking Output vs. Output Voltage
01235268 01235220
Sourcing Output vs. Output Voltage Gain and Phase vs. Capacitive Load @2.7V
01235221 01235222
LMC7111
www.national.com7
2.7V Performance (Continued)
Gain and Phase vs. Capacitive Load @2.7V Gain and Phase vs. Capacitive Load @2.7V
01235223 01235224
3V Performance
Voltage Noise vs. Common Mode Voltage @3V Output Voltage vs. Input Voltage @3V
01235225 01235226
Offset Voltage vs. Common Mode Voltage @3V Sourcing Output vs. Output Voltage
01235227 01235228
LMC7111
www.national.com 8
3V Performance (Continued)
Sinking Output vs. Output Voltage Gain and Phase vs. Capacitive Load @3V
01235229 01235230
Gain and Phase vs. Capacitive Load @3V Gain and Phase vs. Capacitive Load @3V
01235231 01235232
5V Performance
Voltage Noise vs. Common Mode Voltage @5V Output Voltage vs. Input Voltage @5V
01235233 01235234
LMC7111
www.national.com9
5V Performance (Continued)
Offset Voltage vs. Common Mode Voltage @5V Sourcing Output vs. Output Voltage
01235235 01235236
Sinking Output vs. Output Voltage Gain and Phase vs. Capacitive Load @5V
01235237 01235238
Gain and Phase vs. Capacitive Load @5V Gain and Phase vs. Capacitive Load @5V
01235239 01235240
LMC7111
www.national.com 10
5V Performance (Continued)
Non-Inverting Small Signal Pulse Response at 5V Non-Inverting Small Signal Pulse Response at 5V
01235241 01235242
Non-Inverting Small Signal Pulse Response at 5V Non-Inverting Large Signal Pulse Response at 5V
01235243 01235244
Non-Inverting Large Signal Pulse Response at 5V Non-Inverting Large Signal Pulse Response at 5V
01235245 01235246
LMC7111
www.national.com11
5V Performance (Continued)
Inverting Small Signal Pulse Response at 5V Inverting Small Signal Pulse Response at 5V
01235247 01235248
Inverting Small Signal Pulse Response at 5V Inverting Large Signal Pulse Response at 5V
01235249 01235250
Inverting Large Signal Pulse Response at 5V Inverting Large Signal Pulse Response at 5V
01235251 01235252
LMC7111
www.national.com 12
10V Performance
Voltage Noise vs. Common Mode Voltage @10V Output Voltage vs. Input Voltage @10V
01235253 01235254
Offset Voltage vs. Common Mode Voltage @10V Sourcing Output vs. Output Voltage
01235255 01235256
Sinking Output vs. Output Voltage Gain and Phase vs. Capacitive Load @10V
01235257 01235258
LMC7111
www.national.com13
10V Performance (Continued)
Gain and Phase vs. Capacitive Load @10V Gain and Phase vs. Capacitive Load @10V
01235259 01235260
Non-Inverting Small Signal Pulse Response at 10V Non-Inverting Large Signal Pulse Response at 10V
01235261 01235262
Inverting Small Signal Pulse Response at 10V Inverting Large Signal Pulse Response at 10V
01235263 01235264
LMC7111
www.national.com 14
Application Information
1.0 BENEFITS OF THE LMC7111
TINY AMP
Size
The small footprint of the SOT 23-5 packaged Tiny amp,
(0.120 x 0.118 inches, 3.05 x 3.00 mm) saves space on
printed circuit boards, and enable the design of smaller
electronic products. Because they are easier to carry, many
customers prefer smaller and lighter products.
Height
The height (0.056 inches, 1.43 mm) of the Tiny amp makes
it possible to use it in PCMCIA type III cards.
Signal Integrity
Signals can pick up noise between the signal source and the
amplifier. By using a physically smaller amplifier package,
the Tiny amp can be placed closer to the signal source,
reducing noise pickup and increasing signal integrity. The
Tiny amp can also be placed next to the signal destination,
such as a buffer for the reference of an analog to digital
converter.
Simplified Board Layout
The Tiny amp can simplify board layout in several ways.
First, by placing an amp where amps are needed, instead of
routing signals to a dual or quad device, long pc traces may
be avoided.
By using multiple Tiny amps instead of duals or quads,
complex signal routing and possibly crosstalk can be re-
duced.
DIPs available for prototyping
LMC7111 amplifiers packaged in conventional 8-pin dip
packages can be used for prototyping and evaluation without
the need to use surface mounting in early project stages.
Low Supply Current
The typical 25 µA supply current of the LMC7111 extends
battery life in portable applications, and may allow the reduc-
tion of the size of batteries in some applications.
Wide Voltage Range
The LMC7111 is characterized at 2.7V, 3V, 3.3V, 5V and 10V.
Performance data is provided at these popular voltages. This
wide voltage range makes the LMC7111 a good choice for
devices where the voltage may vary over the life of the
batteries.
2.0 INPUT COMMON MODE
VOLTAGE RANGE
The LMC7111 does not exhibit phase inversion when an
input voltage exceeds the negative supply voltage.
The absolute maximum input voltage is 300 mV beyond
either rail at room temperature. Voltages greatly exceeding
this maximum rating can cause excessive current to flow in
or out of the input pins, adversely affecting reliability.
Applications that exceed this rating must externally limit the
maximum input current to ±5 mA with an input resistor as
shown in Figure 1.
3.0 CAPACITIVE LOAD TOLERANCE
The LMC7111 can typically directly drive a 300 pF load with
V
S
= 10V at unity gain without oscillating. The unity gain
follower is the most sensitive configuration. Direct capacitive
loading reduces the phase margin of op-amps. The combi-
nation of the op-amp’s output impedance and the capacitive
load induces phase lag. This results in either an under-
damped pulse response or oscillation.
Capacitive load compensation can be accomplished using
resistive isolation as shown in Figure 2. This simple tech-
nique is useful for isolating the capacitive input of multiplex-
ers and A/D converters.
4.0 COMPENSATING FOR INPUT CAPACITANCE WHEN
USING LARGE VALUE FEEDBACK RESISTORS
When using very large value feedback resistors, (usually
>500 kΩ) the large feed back resistance can react with the
input capacitance due to transducers, photodiodes, and cir-
cuit board parasitics to reduce phase margins.
The effect of input capacitance can be compensated for by
adding a feedback capacitor. The feedback capacitor (as in
Figure 3), C
f
is first estimated by:
or
R
1
C
IN
≤R
2
C
f
which typically provides significant overcompensation.
Printed circuit board stray capacitance may be larger or
smaller than that of a breadboard, so the actual optimum
value for C
F
may be different. The values of C
F
should be
checked on the actual circuit. (Refer to the LMC660 quad
CMOS amplifier data sheet for a more detailed discussion.)
01235214
FIGURE 1. R
I
Input Current Protection for
Voltages Exceeding the Supply Voltage
01235212
FIGURE 2. Resistive Isolation
of a 330 pF Capacitive Load
LMC7111
www.national.com15
Application Information (Continued) 5.0 OUTPUT SWING
The output of the LMC7111 will go to within 100 mV of either
power supply rail for a 10 kΩload and to 20 mV of the rail for
a 100 kΩload. This makes the LMC7111 useful for driving
transistors which are connected to the same power supply.
By going very close to the supply, the LMC7111 can turn the
transistors all the way on or all the way off.
6.0 BIASING GaAs RF AMPLIFIERS
The capacitive load capability, low current draw, and small
size of the SOT23-5 LMC7111 make it a good choice for
providing a stable negative bias to other integrated circuits.
The very small size of the LMC7111 and the LM4040 refer-
ence take up very little board space.
7.0 REFERENCE BUFFER FOR A-TO-D CONVERTERS
The LMC7111 can be used as a voltage reference buffer for
analog-to-digital converters. This works best for A-to-D con-
verters whose reference input is a static load, such as dual
slope integrating A-to-Ds. Converters whose reference input
is a dynamic load (the reference current changes with time)
may need a faster device, such as the LMC7101 or the
LMC7131.
The small size of the LMC7111 allows it to be placed close to
the reference input. The low supply current (25 µA typical)
saves power.
For A-to-D reference inputs which require higher accuracy
and lower offset voltage, please see the LMC6462
datasheet. The LMC6462 has performance similar to the
LMC7111. The LMC6462 is available in two grades with
reduced input voltage offset.
01235218
01235213
FIGURE 3. Cancelling the Effect of Input Capacitance
01235217
CFand Risolation prevent oscillations when driving capacitive loads.
FIGURE 4. Stable Negative Bias
LMC7111
www.national.com 16
Application Information (Continued)
8.0 DUAL AND QUAD DEVICES WITH SIMILAR
PERFORMANCE
The LMC6462 and LMC6464 are dual and quad devices with
performance similar to the LMC7111. They are available in
both conventional through-hole and surface mount packag-
ing. Please see the LMC6462/4 datasheet for details.
9.0 SPICE MACROMODEL
A SPICE macromodel is available for the LMC7111. This
model includes simulation of:
•Input common-mode voltage range
•Frequency and transient response
•Quiescent and dynamic supply current
•Output swing dependence on loading conditions and
many more characteristics as listed on the macro model
disk. Contact your local National Semiconductor sales
office to obtain an operational amplifier spice model li-
brary disk.
10.0 ADDITIONAL SOT23-5 TINY
DEVICES
National Semiconductor has additional parts available in the
space saving SOT23 Tiny package, including amplifiers,
voltage references, and voltage regulators. These devices
include —
LMC7101 1 MHz gain-bandwidth rail-to-rail input and output
amplifier — high input impedance and high gain,
700 µA typical current 2.7V, 3V, 5V and 15V
specifications.
LM7131 Tiny Video amp with 70 MHz gain bandwidth.
Specified at 3V, 5V and ±5V supplies.
LMC7211 Comparator in a tiny package with rail-to-rail in-
put and push-pull output. Typical supply current
of 7 µA. Typical propagation delay of 7 µs. Speci-
fied at 2.7V, 5V and 15V supplies.
LMC7221 Comparator with an open drain output for use in
mixed voltage systems. Similar to the LMC7211,
except the output can be used with a pull-up
resistor to a voltage different than the supply
voltage.
LP2980 Micropower SOT 50 mA Ultra Low-Dropout
Regulator.
LM4040 Precision micropower shunt voltage reference.
Fixed voltages of 2.5000V, 4.096V, 5.000V,
8.192V and 10.000V.
LM4041 Precision micropower shunt voltage reference
1.225V and adjustable.
Contact your National Semiconductor representative for the
latest information.
LMC7111
www.national.com17
SOT-23-5 Tape and Reel
Specification
TAPE FORMAT
Tape Section # Cavities Cavity Status Cover Tape Status
Leader 0 (min) Empty Sealed
(Start End) 75 (min) Empty Sealed
Carrier 3000 Filled Sealed
1000 Filled Sealed
Trailer 125 (min) Empty Sealed
(Hub End) 0 (min) Empty Sealed
TAPE DIMENSIONS
01235215
8 mm 0.130 0.124 0.130 0.126 0.138 ±0.002 0.055 ±0.004 0.157 0.315 ±0.012
(3.3) (3.15) (3.3) (3.2) (3.5 ±0.05) (1.4 ±0.11) (4) (8 ±0.3)
Tape Size DIM A DIM Ao DIM B DIM Bo DIM F DIM Ko DIM P1 DIM W
LMC7111
www.national.com 18
SOT-23-5 Tape and Reel
Specification (Continued)
REEL DIMENSIONS
01235216
8 mm 7.00 0.059 0.512 0.795 2.165 0.331 + 0.059/−0.000 0.567 W1+ 0.078/−0.039
330.00 1.50 13.00 20.20 55.00 8.40 + 1.50/−0.00 14.40 W1 + 2.00/−1.00
Tape Size A B C D N W1 W2 W3
LMC7111
www.national.com19
Physical Dimensions inches (millimeters)
unless otherwise noted
5-Pin SOT23
NS Package Number MF05A
8-Pin Molded DIP
8-Lead (0.300" Wide) Molded Dual-In-Line Package
NS Package Number N08E
LMC7111
www.national.com 20
Notes
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.
For the most current product information visit us at www.national.com.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to result
in a significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
BANNED SUBSTANCE COMPLIANCE
National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C2) and Banned Substances
and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at:
www.national.com/quality/green.
Lead free products are RoHS compliant.
National Semiconductor
Americas Customer
Support Center
Email: new.feedback@nsc.com
Tel: 1-800-272-9959
National Semiconductor
Europe Customer Support Center
Fax: +49 (0) 180-530 85 86
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
National Semiconductor
Asia Pacific Customer
Support Center
Email: ap.support@nsc.com
National Semiconductor
Japan Customer Support Center
Fax: 81-3-5639-7507
Email: jpn.feedback@nsc.com
Tel: 81-3-5639-7560
www.national.com
LMC7111 Tiny CMOS Operational Amplifier with Rail-to-Rail Input and Output
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,
and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should
obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are
sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard
warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where
mandated by government requirements, testing of all parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and
applications using TI components. To minimize the risks associated with customer products and applications, customers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,
or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information
published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a
warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual
property of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied
by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive
business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional
restrictions.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all
express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not
responsible or liable for any such statements.
TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably
be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing
such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products
and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be
provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in
such safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
specifically designated by TI as military-grade or "enhanced plastic."Only products designated by TI as military-grade meet military
specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at
the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.
TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are
designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated
products in automotive applications, TI will not be responsible for any failure to meet such requirements.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products Applications
Audio www.ti.com/audio Communications and Telecom www.ti.com/communications
Amplifiers amplifier.ti.com Computers and Peripherals www.ti.com/computers
Data Converters dataconverter.ti.com Consumer Electronics www.ti.com/consumer-apps
DLP®Products www.dlp.com Energy and Lighting www.ti.com/energy
DSP dsp.ti.com Industrial www.ti.com/industrial
Clocks and Timers www.ti.com/clocks Medical www.ti.com/medical
Interface interface.ti.com Security www.ti.com/security
Logic logic.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense
Power Mgmt power.ti.com Transportation and Automotive www.ti.com/automotive
Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video
RFID www.ti-rfid.com
OMAP Mobile Processors www.ti.com/omap
Wireless Connectivity www.ti.com/wirelessconnectivity
TI E2E Community Home Page e2e.ti.com
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright ©2011, Texas Instruments Incorporated
