TI 108335

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 5-Pin SOT23 package saves space
n Very wide common mode input range
n
n
n
n
n
n
Specified at 2.7V, 5V, and 10V
Typical supply current 25 µA at 5V
50 kHz gain-bandwidth at 5V
Similar to popular LMC6462
Output to within 20 mV of supply rail at 100k load
Good capacitive load drive
Applications
n
n
n
n
n
n
Mobile communications
Portable computing
Current sensing for battery chargers
Voltage reference buffering
Sensor interface
Stable bias for GaAs RF amps
Connection Diagrams
8-Pin MDIP
5-Pin SOT23
01235201
01235202
Top View
Top View
Actual Size
01235219
Ordering Information
Package
8-Pin MDIP
5-Pin SOT23
Part Number
Package Marking
Transport Media
LMC7111AIN
LMC7111AIN
40 Units/Rail
LMC7111BIN
LMC7111BIN
40 Units/Rail
LMC7111BIM5
A01B
LMC7111BIM5X
© 2006 National Semiconductor Corporation
DS012352
1k units Tape and Reel
3k Units Tape and Reel
NSC Drawing
N08E
MF05A
www.national.com
LMC7111 Tiny CMOS Operational Amplifier with Rail-to-Rail Input and Output
June 2006
LMC7111
Absolute Maximum Ratings (Note 1)
Lead Temp. (Soldering, 10 sec.)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
2000V
MDIP Package
1500V
Voltage at Input/Output Pin
+
Junction Temperature Range
LMC7111AI, LMC7111BI
(V ) + 0.3V, (V ) − 0.3V
± 5 mA
± 30 mA
Current at Output Pin (Note 3)
Current at Power Supply Pin
−40˚C ≤ TJ ≤ +85˚C
Thermal Resistance (θJA)
11V
Current at Input Pin
2.5V ≤ V+ ≤ 11V
Supply Voltage
−
Supply Voltage (V+ − V−)
150˚C
Operating Ratings (Note 1)
± Supply Voltage
Differential Input Voltage
−65˚C to +150˚C
Junction Temperature (Note 4)
ESD Tolerance (Note 2)
SOT23 Package
260˚C
8-Pin MDIP
115˚C/W
5-Pin SOT23
325˚C/W
30 mA
2.7V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.7V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ. Boldface limits apply at the temperature extremes.
Symbol
VOS
TCVOS
Parameter
Input Offset Voltage
Conditions
V+ = 2.7V
Typ
LMC7111AI
LMC7111BI
(Note 5)
Limit
Limit
(Note 6)
(Note 6)
0.9
Input Offset Voltage
Units
3
7
mV
5
9
max
2.0
µV/˚C
Average Drift
IB
IOS
RIN
+PSRR
−PSRR
VCM
Input Bias Current
Input Offset Current
(Note 9)
0.1
(Note 9)
0.01
1
pA
20
max
0.5
0.5
pA
10
10
max
Tera Ω
> 10
Input Resistance
Positive Power Supply
2.7V ≤ V ≤5.0V,
Rejection Ratio
V− = 0V, VO = 2.5V
Negative Power Supply
−2.7V ≤ V− ≤−5.0V,
Rejection Ratio
V− = 0V, VO = 2.5V
Input Common-Mode
V+ = 2.7V
Voltage Range
For CMRR ≥ 50 dB
+
60
60
−0.10
2.8
CIN
1
20
Common-Mode Input
55
55
dB
50
50
min
55
55
dB
50
50
min
0.0
0.0
V
0.40
0.40
min
2.7
2.7
V
2.25
2.25
max
3
pF
Capacitance
VO
Output Swing
V+ = 2.7V
2.69
RL = 100 kΩ
0.01
V+ = 2.7V
2.65
RL = 10 kΩ
0.03
ISC
Output Short Circuit
Sourcing, VO = 0V
7
Current
Sinking, VO = 2.7V
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7
2
2.68
2.68
V
2.4
2.4
min
0.02
0.02
V
0.08
0.08
max
2.6
2.6
V
2.4
2.4
min
0.1
0.1
V
0.3
0.3
max
1
1
mA
0.7
0.7
min
1
1
mA
0.7
0.7
min
(Continued)
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.7V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ. Boldface limits apply at the temperature extremes.
Symbol
AVOL
Parameter
Voltage Gain
Conditions
Typ
LMC7111AI
LMC7111BI
(Note 5)
Limit
Limit
(Note 6)
(Note 6)
Sourcing
400
Units
V/mv
min
Sinking
150
V+ = +2.7V,
20
V/mv
min
IS
Supply Current
VO = V+/2
45
50
µA
60
65
max
2.7V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.7V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ. Boldface limits apply at the temperature extremes.
Symbol
Parameter
SR
Slew Rate
GBW
Gain-Bandwidth Product
Conditions
(Note 8)
Typ
LMC7111AI
LMC7111BI
(Note 5)
Limit
Limit
(Note 6)
(Note 6)
Units
0.015
V/µs
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 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 TJ(MAX), θJA and TA. The maximum allowable power dissipation at any ambient temperature is PD =
(TJ(MAX) − 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+ = 2.7V, VCM = 1.35V and RL connected 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 kΩ connected to 1.35V. Amp excited with 1 kHz to produce VO = 1 VPP.
Note 9: Bias Current guaranteed by design and processing.
3V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 3V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ. Boldface
limits apply at the temperature extremes.
Symbol
VCM
Parameter
Conditions
Input Common-Mode
V+ = 3V
Voltage Range
For CMRR ≥ 50 dB
Typ
LMC7111AI
LMC7111BI
(Note 5)
Limit
Limit
(Note 6)
(Note 6)
0.0
0.0
−0.25
Units
V
min
3.2
3
3.0
3.0
V
2.8
2.8
max
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LMC7111
2.7V DC Electrical Characteristics
LMC7111
3.3V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 3.3V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ. Boldface limits apply at the temperature extremes.
Typ
Symbol
Parameter
VCM
Conditions
Input Common-Mode
V+ = 3.3V
Voltage Range
For CMRR ≥ 50 dB
LMC7111AI
(Note 5)
−0.25
3.5
LMC7111BI
Limit
Limit
(Note 6)
(Note 6)
Units
−0.1
−0.1
V
0.00
0.00
min
3.4
3.4
V
3.2
3.2
max
5V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ. Boldface
limits apply at the temperature extremes.
Symbol
VOS
Parameter
Input Offset Voltage
Conditions
V+ = 5V
Typ
LMC7111AI
(Note 5)
Limit
LMC7111BI
Limit
(Note 6)
(Note 6)
0.9
Units
mV
max
TCVOS
Input Offset Voltage
2.0
µV/˚C
Average Drift
IB
Input Bias Current
IOS
Input Offset Current
RIN
Input Resistance
CMRR
Common Mode
(Note 9)
0.1
(Note 9)
0.01
1
1
pA
20
20
max
0.5
0.5
pA
10
10
0V ≤ VCM ≤ 5V
85
70
60
Positive Power Supply
5V ≤ V+ ≤10V,
85
70
60
Rejection Ratio
V− = 0V, VO = 2.5V
Negative Power Supply
−5V ≤ V− ≤−10V,
Rejection Ratio
V− = 0V, VO = −2.5V
Input Common-Mode
V+ = 5V
Voltage Range
For CMRR ≥ 50 dB
Rejection Ratio
+PSRR
−PSRR
VCM
dB
min
dB
min
85
70
60
dB
min
−0.3
5.25
CIN
max
Tera Ω
> 10
Common-Mode Input
−0.20
−0.20
V
0.00
0.00
min
5.20
5.20
V
5.00
5.00
max
3
pF
Capacitance
VO
ISC
Output Swing
Output Short Circuit
V+ = 5V
4.99
4.98
4.98
Vmin
RL = 100 kΩ
0.01
0.02
0.02
Vmax
V+ = 5V
4.98
4.9
4.9
Vmin
RL = 10 kΩ
0.02
0.1
0.1
Vmin
7
5
5
mA
3.5
3.5
min
Sourcing, VO = 0V
Current
Sinking, VO = 3V
AVOL
Voltage Gain
7
Sourcing
500
5
5
mA
3.5
3.5
min
V/mv
min
Sinking
200
V+ = +5V,
25
V/mv
min
IS
Supply Current
+
VO = V /2
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µA
max
4
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ. Boldface
limits apply at the temperature extremes.
Typ
Symbol
Parameter
SR
Slew Rate
GBW
Gain-Bandwidth Product
Conditions
LMC7111AI
(Note 5)
Positive Going Slew Rate
LMC7111BI
Limit
Limit
(Note 6)
(Note 6)
0.015
0.010
0.027
Units
V/µs
(Note 8)
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 of TJ(max), θJA and TA. The maximum allowable power dissipation at any ambient temperature is PD =
(TJ(max) − 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+ = 5V, VCM = 2.5V and RL connected 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 kΩ connected to 1.5V. Amp excited with 1 kHz to produce VO = 1 VPP.
Note 18: Bias Current guaranteed by design and processing.
10V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 10V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ. Boldface limits apply at the temperature extremes.
Symbol
VOS
TCVOS
Parameter
Input Offset Voltage
Conditions
V+ = 10V
Typ
LMC7111AI
(Note 5)
Limit
Limit
(Note 6)
(Note 6)
0.9
Input Offset Voltage
LMC7111BI
Units
3
7
mV
5
9
max
2.0
µV/˚C
Average Drift
IB
Input Bias Current
0.1
IOS
Input Offset Current
0.01
RIN
Input Resistance
> 10
+PSRR
Positive Power Supply
5V ≤ V+ ≤10V,
Rejection Ratio
V− = 0V, VO = 2.5V
Negative Power Supply
−5V ≤ V− ≤−10V,
Rejection Ratio
V− = 0V, VO = 2.5V
Input Common-Mode
V+ = 10V
Voltage Range
For CMRR ≥ 50 dB
−PSRR
VCM
CIN
1
1
pA
20
20
max
0.5
0.5
pA
10
10
max
Tera Ω
80
dB
min
80
dB
min
Common-Mode Input
−0.2
−0.15
−0.15
V
10.2
0.00
0.00
min
10.15
10.15
10.00
V
10.00
max
3
pF
Capacitance
ISC
Output Short Circuit
Sourcing, VO = 0V
30
Current (Note 9)
Sinking, VO = 10V
30
5
20
20
mA
7
7
min
20
20
mA
7
7
min
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LMC7111
5V AC Electrical Characteristics
LMC7111
10V DC Electrical Characteristics
(Continued)
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 10V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ. Boldface limits apply at the temperature extremes.
Symbol
AVOL
Parameter
Voltage Gain
Conditions
Typ
LMC7111AI
LMC7111BI
(Note 5)
Limit
Limit
(Note 6)
(Note 6)
Sourcing
500
Units
V/mv
100 kΩ Load
min
Sinking
200
V+ = +10V,
25
V/mv
min
IS
Supply Current
VO = V+/2
VO
Output Swing
50
60
µA
65
75
max
V+ = 10V
9.99
9.98
9.98
Vmin
RL = 100 kΩ
0.01
0.02
0.02
Vmax
V+ = 10V
9.98
9.9
9.9
Vmin
RL = 10 kΩ
0.02
0.1
0.1
Vmin
10V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 10V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ. Boldface limits apply at the temperature extremes.
Typ
Symbol
Parameter
Conditions
(Note 5)
(Note 8)
LMC7111AI
LMC7111BI
Limit
Limit
(Note 6)
(Note 6)
Units
SR
Slew Rate
0.03
V/µs
GBW
Gain-Bandwidth Product
50
kHz
φm
Phase Margin
50
deg
Gm
Gain Margin
15
dB
Input-Referred
f = 1 kHz
Voltage Noise
VCM = 1V
Input-Referred
f = 1 kHz
110
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 of TJ(max), θJA and TA. The maximum allowable power dissipation at any ambient temperature is PD =
(TJ(max) − 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+ = 10V, VCM = 5V and RL connected 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 kΩ connected to 5V. Amp excited with 1 kHz to produce VO = 2 VPP.
Note 27: Operation near absolute maximum limits will adversely affect reliability.
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6
LMC7111
Typical Performance Characteristics
TA = 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
Gain and Phase vs. Capacitive Load @ 2.7V
Sourcing Output vs. Output Voltage
01235221
01235222
7
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LMC7111
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
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01235228
8
(Continued)
Gain and Phase vs. Capacitive Load @ 3V
Sinking Output vs. Output Voltage
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
9
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LMC7111
3V Performance
LMC7111
5V Performance
(Continued)
Offset Voltage vs. Common Mode Voltage @ 5V
Sourcing Output vs. Output Voltage
01235235
01235236
Gain and Phase vs. Capacitive Load @ 5V
Sinking Output vs. Output Voltage
01235237
01235238
Gain and Phase vs. Capacitive Load @ 5V
Gain and Phase vs. Capacitive Load @ 5V
01235239
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01235240
10
(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
11
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LMC7111
5V Performance
LMC7111
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
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01235252
12
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
Gain and Phase vs. Capacitive Load @ 10V
Sinking Output vs. Output Voltage
01235257
01235258
13
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LMC7111
10V Performance
LMC7111
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
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01235264
14
LMC7111
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.
01235214
FIGURE 1. RI Input Current Protection for
Voltages Exceeding the Supply Voltage
Height
3.0 CAPACITIVE LOAD TOLERANCE
The height (0.056 inches, 1.43 mm) of the Tiny amp makes
it possible to use it in PCMCIA type III cards.
The LMC7111 can typically directly drive a 300 pF load with
VS = 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 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.
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.
Capacitive load compensation can be accomplished using
resistive isolation as shown in Figure 2. This simple technique is useful for isolating the capacitive input of multiplexers and A/D converters.
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.
01235212
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.
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), Cf is first estimated by:
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 ± 5 mA with an input resistor as
shown in Figure 1.
or
R1 CIN ≤ R2 Cf
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 CF may be different. The values of CF should be
checked on the actual circuit. (Refer to the LMC660 quad
CMOS amplifier data sheet for a more detailed discussion.)
15
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LMC7111
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 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.
01235213
FIGURE 3. Cancelling the Effect of Input Capacitance
01235217
CF and Risolation prevent oscillations when driving capacitive loads.
FIGURE 4. Stable Negative Bias
7.0 REFERENCE BUFFER FOR A-TO-D CONVERTERS
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.
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.
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
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16
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.
(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 packaging. Please see the LMC6462/4 datasheet for details.
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 input and push-pull output. Typical supply current
of 7 µA. Typical propagation delay of 7 µs. Specified at 2.7V, 5V and 15V supplies.
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
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.
• 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.
LM4040
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
LM4041
Precision micropower shunt voltage reference.
Fixed voltages of 2.5000V, 4.096V, 5.000V,
8.192V and 10.000V.
Precision micropower shunt voltage reference
1.225V and adjustable.
Contact your National Semiconductor representative for the
latest information.
17
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LMC7111
Application Information
LMC7111
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
(3.3)
(3.15)
Tape Size
DIM A
DIM Ao
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0.124
0.126
0.138 ± 0.002
0.055 ± 0.004
(3.3)
(3.2)
(3.5 ± 0.05)
DIM B
DIM Bo
DIM F
0.130
18
0.157
0.315 ± 0.012
(1.4 ± 0.11)
(4)
(8 ± 0.3)
DIM Ko
DIM P1
DIM W
LMC7111
SOT-23-5 Tape and Reel
Specification (Continued)
REEL DIMENSIONS
01235216
8 mm
Tape Size
7.00
0.059 0.512 0.795 2.165
330.00
1.50
A
B
0.331 + 0.059/−0.000
0.567
W1+ 0.078/−0.039
8.40 + 1.50/−0.00
14.40
W1 + 2.00/−1.00
W1
W2
W3
13.00 20.20 55.00
C
D
N
19
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LMC7111
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
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20
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.
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device or system whose failure to perform can be reasonably
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LMC7111 Tiny CMOS Operational Amplifier with Rail-to-Rail Input and Output
Notes