August 1999
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 designs. 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
n Tiny SOT23-5 package saves space
n Very wide common mode input range
Connection Diagrams
n Specified at 2.7V, 5V, and 10V
n Typical supply current 25 µA at 5V
n 50 kHz gain-bandwidth at 5V
n Similar to popular LMC6462
n Output to within 20 mV of supply rail at 100k load
n Good capacitive load drive
Applications
n Mobile communications
n Portable computing
n Current sensing for battery chargers
n Voltage reference buffering
n Sensor interface
n Stable bias for GaAs RF amps
LMC7111 Tiny CMOS Operational Amplifier with Rail-to-Rail Input and Output
8-Pin DIP
Top View
Ordering Information
Package Ordering NSC Drawing Package Transport Media
Information Number Marking
8-Pin DIP LMC7111AIN N08E LMC7111AIN Rails
8-Pin DIP LMC7111BIN N08E LMC7111BIN Rails
5-Pin SOT23-5
LMC7111BIM5 MA05A A01B 1k units Tape and Reel
LMC7111BIM5X MA05A A01B 3k Units Tape and Reel
DS012352-1
5-Pin SOT23-5
DS012352-2
Top View
Actual Size
DS012352-19
© 1999 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 SOT23-5 (Note 2) 2000V
ESD Tolerance DIP Package
(Note 2) 1500V
Differential Input Voltage
Voltage at Input/Output Pin (V
Supply Voltage (V
+−V−
)11V
Current at Input Pin
Current at Output Pin (Note 3)
Current at Power Supply Pin 30 mA
±
Supply Voltage
+
) + 0.3V, (V−) − 0.3V
±
5mA
±
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
Junction Temperature Range
LMC7111AI, LMC7111BI −40˚C ≤ T
Thermal Resistance (θ
)
JA
N Package, 8-Pin Molded DIP 115˚C/W
M05A Package,
5-Pin Surface Mount 325˚C/W
+
≤ 11V
≤ +85˚C
J
2.7V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
face limits apply at the temperature extremes.
J
=
25˚C, V
+
=
2.7V, V
−
=
0V, V
CM
+
=
=
/2 and R
V
V
O
>
1MΩ.Bold-
L
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
Input Offset Voltage 2.0 µV/˚C
OS
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
+PSRR Positive Power Supply 2.7V ≤ V
−
Rejection Ratio V
=
0V, V
−PSRR Negative Power Supply −2.7V ≤ V
−
Rejection Ratio V
V
CM
Input Common-Mode V
=
0V, V
+
=
2.7V −0.10 0.0 0.0 V
+
≤5.0V, 60 55 55 dB
=
2.5V 50 50 min
O
−
≤−5.0V, 60 55 55 dB
=
2.5V 50 50 min
O
>
10 Tera Ω
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
100 kΩ 2.4 2.4 min
L
0.01 0.02 0.02 V
0.08 0.08 max
+
=
V
2.7V 2.65 2.6 2.6 V
=
R
10 kΩ 2.4 2.4 min
L
0.03 0.1 0.1 V
0.3 0.3 max
I
SC
Output Short Circuit Sourcing, V
=
0V 7 1 1 mA
O
Current 0.7 0.7 min
Sinking, V
=
2.7V 7 1 1 mA
O
0.7 0.7 min
www.national.com 2
2.7V DC Electrical Characteristics (Continued)
Unless otherwise specified, all limits guaranteed for T
face limits apply at the temperature extremes.
=
J
25˚C, V
+
=
Symbol Parameter Conditions (Note 5) Limit Limit Units
A
VOL
Voltage Gain Sourcing 400 V/mv
Sinking 150 V/mv
+
I
S
Supply Current V
=
+2.7V, 20 45 50 µA
+
=
V
/2 60 65 max
V
O
2.7V, V
−
=
0V, V
=
CM
+
=
/2 and R
V
V
O
Typ LMC7111AI LMC7111BI
(Note 6) (Note 6)
>
1MΩ.Bold-
L
min
min
2.7V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
face limits apply at the temperature extremes.
J
=
25˚C, V
+
=
2.7V, V
−
=
0V, V
=
CM
+
=
/2 and R
V
V
O
>
1MΩ.Bold-
L
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 beyondwhichdamage 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, 1.5 kΩ in 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 T
−TA)/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
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
R
Note 9: Bias Current guaranteed by design and processing.
=
=
100 kΩ connected to 1.35V. Amp excited with 1 kHz to produce V
L
2.7V, V
CM
=
1.35V and R
connected to 1.35V. For Sourcing tests, 1.35V ≤ VO≤ 2.7V. For Sinking tests, 0.5V ≤ VO≤ 1.35V.
L
3V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
face limits apply at the temperature extremes.
, θJAand TA. The maximum allowable power dissipation at any ambient temperature is P
J(max)
=
.
1V
O
PP
J
=
25˚C, V
+
=
3V, V
−
=
0V, V
=
CM
+
=
/2 and R
V
V
O
>
L
=
(T
D
+
=
2.7V and
1MΩ.Bold-
J(max)
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
www.national.com3
3.3V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
face limits apply at the temperature extremes.
J
=
25˚C, V
+
=
3.3V, V
−
=
0V, V
CM
+
=
=
/2 and R
V
V
O
>
1MΩ.Bold-
L
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
face limits apply at the temperature extremes.
=
J
25˚C, V
+
=
5V, V
−
=
0V, V
CM
+
=
=
/2 and R
V
V
O
>
1MΩ.Bold-
L
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
Input Offset Voltage 2.0 µV/˚C
OS
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
CMRR Common Mode 0V ≤ V
≤ 5V 85 70 60 dB
CM
>
10 Tera Ω
Rejection Ratio min
+PSRR Positive Power Supply 5V ≤ V
Rejection Ratio V
−PSRR Negative Power Supply −5V ≤ V
Rejection Ratio V
V
CM
Input Common-Mode V
+
≤10V, 85 70 60 dB
−
=
−
=
+
=
=
0V, V
0V, V
2.5V min
O
−
≤−10V, 85 70 60 dB
=
−2.5V min
O
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
I
SC
Output Swing V
Output Short Circuit Sourcing, V
=
5V 4.99 4.98 4.98 Vmin
=
R
100 kΩ 0.01 0.02 0.02 Vmax
L
+
=
V
5V 4.98 4.9 4.9 Vmin
=
R
10 kΩ 0.02 0.1 0.1 Vmin
L
=
0V 7 5 5 mA
O
Current 3.5 3.5 min
Sinking, V
=
3V 7 5 5 mA
O
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
/2 max
V
O
www.national.com 4
5V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
face limits apply at the temperature extremes.
=
J
25˚C, V
+
=
5V, V
−
=
0V, V
=
CM
+
=
/2 and R
V
V
O
>
1MΩ.Bold-
L
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 kΩ in 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 ofT
−TA)/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
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 R
Note 18: Bias Current guaranteed by design and processing.
=
5V, V
2.5V and R
CM
=
100 kΩ connected to 1.5V. Amp excited with 1 kHz to produce V
L
connected to 2.5V. For Sourcing tests, 2.5V ≤ VO≤ 5.0V. For Sinking tests, 0.5V ≤ VO≤ 2.5V.
L
, θJAand TA. The maximum allowable power dissipation at any ambient temperature is P
J(max)
=
.
1V
O
PP
=
(T
D
J(max)
10V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
face limits apply at the temperature extremes.
=
J
25˚C, V
+
=
10V, V
−
=
0V, V
=
CM
+
=
/2 and R
V
V
O
>
1MΩ.Bold-
L
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
Input Offset Voltage 2.0 µV/˚C
OS
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
+PSRR Positive Power Supply 5V ≤ V
−
Rejection Ratio V
=
0V, V
−PSRR Negative Power Supply −5V ≤ V
−
Rejection Ratio V
V
CM
Input Common-Mode V
=
0V, V
+
=
10V −0.2 −0.15 −0.15 V
+
≤10V, 80 dB
=
2.5V min
O
−
≤−10V, 80 dB
=
2.5V min
O
>
10 Tera Ω
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
=
0V 30 20 20 mA
O
Current (Note 9) 77min
Sinking, V
=
10V 30 20 20 mA
O
77min
www.national.com5
10V DC Electrical Characteristics (Continued)
Unless otherwise specified, all limits guaranteed for T
face limits apply at the temperature extremes.
=
J
25˚C, V
+
Symbol Parameter Conditions (Note 5) Limit Limit Units
A
VOL
Voltage Gain Sourcing 500 V/mv
100 kΩ Load min
Sinking 200 V/mv
+
I
S
V
O
Supply Current V
Output Swing V
=
+10V, 25 50 60 µA
+
=
V
/2 65 75 max
V
O
+
=
10V 9.99 9.98 9.98 Vmin
=
R
100 kΩ 0.01 0.02 0.02 Vmax
L
+
=
V
10V 9.98 9.9 9.9 Vmin
=
R
10 kΩ 0.02 0.1 0.1 Vmin
L
=
10V, V
−
=
0V, V
=
CM
+
=
V
V
O
Typ LMC7111AI LMC7111BI
(Note 6) (Note 6)
/2 and R
>
1MΩ.Bold-
L
min
10V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
face limits apply at the temperature extremes.
J
=
25˚C, V
+
=
10V, V
−
=
0V, V
=
CM
+
=
/2 and R
V
V
O
>
1MΩ.Bold-
L
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
G
m
Phase Margin 50 deg
Gain Margin 15 dB
Input-Referred f=1 kHz 110
Voltage Noise V
=
1V
CM
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 kΩ in 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 ofT
−TA)/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
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
R
Note 27: Operation near absolute maximum limits will adversely affect reliability.
=
=
100 kΩ connected to 5V. Amp excited with 1 kHz to produce V
L
10V, V
CM
=
5V and R
connected to 5V. For Sourcing tests, 5V ≤ VO≤ 10V. For Sinking tests, 0.5V ≤ VO≤ 5V.
L
, θJAand TA. The maximum allowable power dissipation at any ambient temperature is P
J(max)
=
.
2V
O
PP
D
+
=
(T
=
10V and
J(max)
www.national.com 6
Typical Performance Characteristics T
Supply Current vs
Supply Voltage
=
25˚C unless specified, Single Supply
A
Voltage Noise vs Frequency
2.7V PERFORMANCE
Offset Voltage vs Common
Mode Voltage
Gain and Phase vs
Capacitive Load
@
2.7V
DS012352-68
@
2.7V
DS012352-3
Sinking Output vs
Output Voltage
Gain and Phase vs
Capacitive Load
DS012352-4
Sourcing Output vs
Output Voltage
DS012352-20
@
2.7V
Gain and Phase vs
Capacitive Load
@
DS012352-21
2.7V
DS012352-22
DS012352-23
DS012352-24
www.national.com7
3V PERFORMANCE
Voltage Noise vs Common
Mode Voltage
@
3V
Sourcing Output vs
Output Voltage
Gain and Phase vs
Capacitive Load
@
3V
DS012352-25
DS012352-28
Output Voltage vs Input
@
Voltage
3V
Sinking Output vs
Output Voltage
Gain and Phase vs
Capacitive Load
DS012352-26
DS012352-29
Offset Voltage vs Common
Mode Voltage
Gain and Phase vs
Capacitive Load
@
3V
@
3V
DS012352-27
@
3V
DS012352-30
DS012352-31
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DS012352-32
5V PERFORMANCE
Voltage Noise vs Common
Mode Voltage
@
5V
Sourcing Output vs
Output Voltage
Gain and Phase vs
Capacitive Load
@
5V
DS012352-33
DS012352-36
Output Voltage vs
Input Voltage
@
5V
Sinking Output vs
Output Voltage
Gain and Phase vs
Capacitive Load
Offset Voltage vs Common
Mode Voltage
DS012352-34
@
5V
DS012352-35
Gain and Phase vs
Capacitive Load
DS012352-37
@
5V
Non-Inverting Small Signal
Pulse Response at 5V
@
5V
DS012352-38
Non-Inverting Small Signal
Pulse Response at 5V
DS012352-42
DS012352-39
Non-Inverting Small Signal
Pulse Response at 5V
DS012352-43
DS012352-41
DS012352-40
Non-Inverting Large Signal
Pulse Response at 5V
DS012352-44
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5V PERFORMANCE (Continued)
Non-Inverting Large Signal
Pulse Response at 5V
DS012352-45
Inverting Small Signal
Pulse Response at 5V
DS012352-48
Inverting Large Signal
Pulse Response at 5V
Non-Inverting Large Signal
Pulse Response at 5V
DS012352-46
Inverting Small Signal
Pulse Response at 5V
DS012352-49
Inverting Large Signal
Pulse Response at 5V
Inverting Small Signal
Pulse Response at 5V
DS012352-47
Inverting Large Signal
Pulse Response at 5V
DS012352-50
DS012352-51
10V PERFORMANCE
Voltage Noise vs Common
Mode Voltage
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@
10V
DS012352-53
Output Voltage vs
Input Voltage
@
10V
DS012352-54
DS012352-52
Offset Voltage vs Common
Mode Voltage
@
10V
DS012352-55
10V PERFORMANCE (Continued)
Sourcing Output vs
Output Voltage
Gain and Phase vs
Capacitive Load
@
10V
Non-Inverting Large Signal
Pulse Response at 10V
DS012352-56
DS012352-59
Sinking Output vs
Output Voltage
Gain and Phase vs
Capacitive Load
@
10V
Inverting Small Signal
Pulse Response at 10V
DS012352-57
DS012352-60
Gain and Phase vs
Capacitive Load
@
10V
Non-Inverting Small Signal
Pulse Response at 10V
DS012352-61
Inverting Large Signal
Pulse Response at 10V
DS012352-58
DS012352-62
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
DS012352-63
DS012352-64
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 reduced.
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.
www.national.com11
Application Information (Continued)
Low Supply Current. The typical 25 µA supply current of
the LMC7111 extends battery life in portable applications,
and may allow the reduction 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
shown in
Figure 1
FIGURE 1. RIInput Current Protection for
Voltages Exceeding the Supply Voltage
3.0 Capacitive Load Tolerance
The LMC7111 can typically directly drive a 300 pF load with
=
10V at unity gain without oscillating. The unity gain fol-
V
S
lower is the most sensitive configuration. Direct capacitive
loading reduces the phase margin of op-amps. The combination of the op-amp’s output impedance and the capacitive
load induces phase lag. This results in either an underdamped pulse response or oscillation.
Capacitive load compensation can be accomplished using
resistive isolation as shown in
nique is useful for isolating the capacitive input of multiplexers and A/D converters.
±
5 mA with an input resistor as
.
DS012352-14
Figure 2
. This simple tech-
DS012352-12
FIGURE 2. Resistive Isolation
of a 330 pF Capacitive Load
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 circuit 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
), Cfis first estimated by:
or
≤ R2C
R
1CIN
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
checked on the actual circuit. (Refer to the LMC660 quad
may be different. The values of CFshould be
F
CMOS amplifier data sheet for a more detailed discussion.)
DS012352-13
FIGURE 3. Cancelling the Effect of Input Capacitance
www.national.com 12
5.0 Output Swing
The output of the LMC7111will go to within 100 mV of either
power supply rail for a 10 kΩ load and to 20 mV of the rail for
a 100 kΩ load. 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 reference take up very little board space.
Application Information (Continued)
CFand R
prevent oscillations when driving capacitive loads.
isolation
FIGURE 4. Stable Negative Bias
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 converters 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.
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 packaging. 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 library
disk.
DS012352-17
The small size of the LMC7111allows 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.
DS012352-18
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 out-
put 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. Specified at 2.7V, 5V and 15V supplies.
LMC7221 Comparator with an open drain output for use in
mixed voltage systems. Similar to the LMC7211,
www.national.com13
Application Information (Continued)
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
LM4040 Precision micropower shunt voltage reference.
LM4041 Precision micropower shunt voltage reference
Contact your National Semiconductor representative for the
latest information.
Regulator.
Fixed voltages of 2.5000V, 4.096V, 5.000V,
8.192V and 10.000V.
1.225V and adjustable.
www.national.com 14
SOT-23-5 Tape and Reel Specification
TAPE FORMAT
Tape Section
Leader 0 (min) Empty Sealed
(Start End) 75 (min) Empty Sealed
Carrier 3000 Filled Sealed
Trailer 125 (min) Empty Sealed
(Hub End) 0 (min) Empty Sealed
TAPE DIMENSIONS
#
Cavities Cavity Status Cover Tape Status
1000 Filled Sealed
DS012352-15
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
Tape Size DIM A DIM Ao DIM B DIM Bo DIM F DIM Ko DIM P1 DIM W
±
0.05) (1.4±0.11) (4) (8±0.3)
www.national.com15
SOT-23-5 Tape and Reel Specification (Continued)
REEL DIMENSIONS
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
DS012352-16
www.national.com 16
Physical Dimensions inches (millimeters) unless otherwise noted
*
Suffix indicates number of units. See Ordering Information on first page.
Order Package Number LMC7111BIM5
5-Pin SOT Package
NS Package Number MA05A
*
www.national.com17
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
8-Lead (0.300" Wide) Molded Dual-In-Line Package
8-Pin Molded DIP
Order Package Number LMC7111AIN or LMC7111BIN
NS Package Number N08E
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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:
LMC7111 Tiny CMOS Operational Amplifier with Rail-to-Rail Input and Output
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
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.
labeling, can be reasonably expected to result in a
significant injury to the user.
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www.national.com
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Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
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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