查询LMC272供应商
LMC272
CMOS Dual Low Cost Rail to Rail Output Operational
Amplifier
LMC272 CMOS Dual Low Cost Rail to Rail Output Operational Amplifier
December 1996
General Description
The LMC272 is a CMOS dual operational amplifier with
rail-to-rail output swing and an input common voltage range
that extends below the negative supply. Other performance
characteristics include low voltage operation, low bias current, excellent channel-to-channel isolation, good bandwidth
performance and a competitive price.
These devices are available in MSOP package which is
about half the size of a SO-8 device. This enables the designer to fit the device in extremely small applications.
The LMC272C is a direct replacement for TLC272C with performance which meets or exceeds the TLC272C’s guaranteed limits in the commercial temperature range when operating from a supply of 2.7V to 15V (see Electrical
Characteristics table for details).
These features make this cost effective device ideal for new
designs as well as for upgrading existing designs. Applications include hand-held analytic instruments, transducer amplifiers, sample and hold circuits, etc.
Connection Diagram
Features
=
(Typical unless otherwise noted) V
n Output Swing to within 60 mV of supply rail (10 kΩ load)
n High voltage gain: 90 dB
n Unity gain-bandwidth: 2.0 MHz
n Wide supply voltage: 2.7V to 15V
n Characterized for: 2.7V, 5V, 10V
n Low supply current: 0.975 mA/amplifier
n Input voltage range: −0.3V to 4.2V
S
5V, T
=
25˚C
A
Applications
n Portable instruments
n Upgrade for TLC272C and TS272C
n Photodetector preamplifiers
n D/A converters
n Filters
DS012867-1
Top View
Ordering Information
Package Ordering NSC Drawing Package Supplied as
Information Number Marking
8-pin Molded DIP LMC272CN N08E LMC272CN Rails
8-pin SO-8 LMC272CM M08A LMC272CM Rails
LMC272CMX M08A LMC272CM 2.5k Tape and Reel
MSOP LMC272CMM MUA08A A07 Rails
LMC272CMMX MUA08A A07 3k Tape and Reel
© 1999 National Semiconductor Corporation DS012867 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) 2 kV
Differential Input Voltage
Voltage at Input/Output Pin (V
Supply Voltage (V
+−V−
): 16V
Current at Input Pin (Note 10)
Current at Output Pin (Note 3)
(Note 7)
Lead Temperature
(soldering, 10 sec.) 260˚C
±
Supply Voltages
+
)+0.3V, (V−)−0.3V
±
5mA
±
30 mA
Storage Temp. Range −65˚C to +150˚C
Junction Temperature (Note 4) 150˚C
Operating Ratings(Note 1)
Supply Voltage 2.5V ≤ V
Junction Temperature Range
LMC272C 0˚C ≤ T
Thermal Resistance (θ
)
JA
N Package, 8-pin Molded DIP 115˚ C/W
M Package, 8-pin Surface Mount 177˚ C/W
MSOP Package 235˚ C/W
≤ 15V
S
≤ +70˚C
J
2.7V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
>
1MΩ.Boldface limits apply at the temperature extremes
J
=
25˚C, V
+
=
2.7V, V
−
=
0V, V
CM
+
=
=
/2, RLto ground, and R
V
V
O
Typ LMC272C
Symbol Parameter Conditions (Note 5) Limit Units
(Note 6)
V
OS
Input Offset Voltage V
O
=
1.4V, R
=
S
50, V
=
=
0V, R
CM
10k 1.40 7 mV
L
9 max
TCV
Temp. Coefficient of T
OS
=
0˚C to 70˚C 3.9 µV/˚C
A
Input Offset Voltage
I
B
Input Bias Current 1 64 pA
max
I
OS
Input Offset Current 0.5 32 pA
max
CMRR Common Mode V
=
−0.2V to 1.2V 77 65 dB
CM
Rejection Ratio 60 min
PSRR Power Supply V+=2.7V to 5V, V
=
1.4V 75 65 dB
O
Rejection Ratio 60 min
V
CM
Input Common-Mode CMRR ≥ 50 dB 1.7 1.5 V
Voltage Range 1.2 min
−0.3 −0.2 V
−0.2 max
A
V
Large Signal Voltage V
=
0.25V to 2.45V, R
O
=
10k 88 dB
L
Gain
V
O
Output Swing R
=
L
10 kΩ,V
=
100 mV 2.64 2.55 V
ID
(Note 11) min
=
V
−100 mV 0 20 mV
ID
(Note 11) 25 max
I
SC
Output Short Circuit Sourcing, V
=
100 mV 3.7 mA
ID
Current (Note 11)
Sinking, V
=
−100 mV 2.5 mA
ID
(Note 11)
I
S
Total Supply Current 1.60 2.5 mA
3.0 max
L
www.national.com 2
2.7V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
>
1MΩ.Boldface limits apply at the temperature extremes
J
=
25˚C, V
+
=
2.7V, V
−
=
0V, V
CM
+
=
=
/2, RLto ground and R
V
V
O
Typ LMC272C
Symbol Parameter Conditions (Note 5) Limit Units
(Note 6)
=
=
+1, R
SR Slew Rate (Note 8) A
V
VI=1V
10 kΩ,
L
=
20 pF 1.7 V/µs
PP,CL
(Note 12)
GBW Unity Gain Frequency VI=10 mV
=
20 pF 1.9 MHz
PP,CL
(Note 12)
φ
m
Phase Margin VI=10 mVPP,C
=
20 pF 39 Deg
L
(Note 12)
e
n
Input-Referred f=1 kHz, R
=
20Ω
S
27
Voltage Noise
i
n
Input-Referred f=1 kHz
0.0015
Current Noise
f
max
Full Power Bandwidth V
=
S
10V, C
L
=
20 pF, R
=
20 kΩ 120 kHz
L
Amp-to-Amp Isolation (Note 9) 150 dB
THD Total Harmonic A
=
V
+1, V
=
0.7V
IN
PP
0.035
Distortion f=1 kHz
L
%
www.national.com3
5V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
1MΩ.Boldface limits apply at the temperature extremes
J
=
25˚C, V
+
=
5V, V
−
=
0V, V
=
CM
+
=
/2, RLto ground and R
V
V
O
Typ LMC272C
Symbol Parameter Conditions (Note 5) Limit Units
(Note 6)
V
OS
TCV
Input Offset Voltage V
OS
Temp. Coefficient of T
=
1.4V, R
O
=
R
10k, V
L
=
0˚C to 70˚C 3.3 µV/˚C
A
=
50, 1.75 7 mV
S
=
0V 9 max
CM
Input Offset Voltage
I
B
I
OS
CMRR Common Mode V
Input Bias Current 1 64 pA
Input Offset Current 0.5 32 pA
=
−0.2V to 3.5V 77 65 dB
CM
Rejection Ratio 60 min
PSRR Power Supply V+=5V to 10V, V
=
1.4V 88 65 dB
O
Rejection Ratio 60 min
V
CM
Input Common-Mode CMRR ≥ 50 dB 4.2 4 V
Voltage Range 3.5 min
−0.3 −0.2 V
−0.2 max
A
V
Large Signal Voltage V
=
0.25V to 2V, R
O
=
10k 90 80 dB
L
Gain 72 min
V
O
Output Swing R
=
L
10 kΩ,V
=
100 mV 4.94 4.85 V
ID
(Note 11) 4.75 min
=
V
−100 mV 0 20 mV
ID
(Note 11) 25 max
I
SC
Output Short Circuit Sourcing, V
=
100 mV 16 mA
ID
Current (Note 11)
Sinking, V
=
−100 mV 16 mA
ID
(Note 11)
I
S
1.95 3.2 mA
3.6 max
L
max
max
>
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5V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
1MΩ.Boldface limits apply at the temperature extremes
J
=
25˚C, V
+
=
5V, V
−
=
0V, V
=
CM
+
=
/2, RLto ground and R
V
V
O
Typ LMC272C
Symbol Parameter Conditions (Note 5) Limit Units
(Note 6)
=
=
+1, R
SR Slew Rate (Note 8) A
V
VI=1V
10 kΩ, V/µs
L
=
20 pF 2.5
PP,CL
(Note 12)
=
+1, R
=
10 kΩ,
L
=
20 pF 2.5
PP,CL
A
V
VI=2.5 V
(Note 12)
GBW Unity Gain Frequency VI=10 mV, C
=
20 pF 2.0 MHz
L
(Note 12)
φ
m
Phase Margin VI=10 mV, C
=
20 pF 43 Deg
L
(Note 12)
e
n
Input-Referred f=1 kHz, R
=
20Ω
S
25
Voltage Noise
i
n
Input-Referred f=1 kHz
0.0015
Current Noise
f
max
Full Power Bandwidth V
=
S
10V, C
L
=
20 pF, R
=
20 kΩ 120 kHz
L
Amp-to-Amp Isolation (Note 9) 150 dB
THD Total Harmonic A
=
V
+1, V
=
2.5 V
IN
PP
0.015
Distortion f=1 kHz
>
L
%
www.national.com5
10V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
1MΩ.Boldface limits apply at the temperature extremes
J
=
25˚C, V
+
=
10V, V
−
=
0V, V
CM
+
=
=
/2, RLto ground and R
V
V
O
Typ LMC272C
Symbol Parameter Conditions (Note 5) Limit Units
(Note 6)
V
OS
TCV
Input Offset Voltage V
OS
Temp. Coefficient of T
=
O
=
R
10k, V
L
=
0˚C to 70˚C 3.6 µV/˚C
A
1.4V, R
=
50, 2.1 7 mV
S
=
0V 9 max
CM
Input Offset Voltage
I
B
I
OS
CMRR Common Mode V
Input Bias Current 1 64 pA
Input Offset Current 0.5 32 pA
=
−0.2V to 8.5V 77 65 dB
CM
Rejection Ratio 60 min
PSRR Power Supply V+=5V to 10V, V
=
1.4V 88 65 dB
O
Rejection Ratio 60 min
V
CM
Input Common-Mode CMRR ≥ 50 dB 9.2 9 V
Voltage Range 8.5 min
−0.3 −0.2 V
−0.2 max
A
V
Large Signal Voltage V
=
1V to 6V, R
O
=
10k 95 85 dB
L
Gain 78 min
V
O
Output Swing R
=
L
10 kΩ,V
=
100 mV 9.93 9.85 V
ID
(Note 11) 9.75 min
=
V
−100 mV 33 45 mV
ID
(Note 11) 50 max
I
SC
Output Short Circuit Sourcing, V
=
100 mV 55 mA
ID
Current (Note 11)
Sinking, V
=
−100 mV 25 mA
ID
(Note 11)
I
S
Total Supply Current 2.25 3.6 mA
4.0 max
max
max
>
L
www.national.com 6
10V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
1MΩ.Boldface limits apply at the temperature extremes
J
=
25˚C, V
+
=
10V, V
−
=
0V, V
CM
+
=
=
/2, RLto ground and R
V
V
O
Typ LMC272C
Symbol Parameter Conditions (Note 5) Limit Units
(Note 6)
SR Slew Rate (Note 8) A
+1, R
V
VI=1V
10 kΩ, V/µs
L
=
20 pF 2.65
PP,CL
=
=
(Note 12)
=
+1, R
=
10 kΩ,
L
=
20 pF 2.65
PP,CL
A
V
VI=5.5 V
(Note 12)
GBW Unity Gain Frequency VI=10 mV, C
=
20 pF 2.1 MHz
L
(Note 12)
φ
m
Phase Margin VI=10 mV, C
=
20 pF 44 Deg
L
(Note 12)
e
n
Input-Referred f=1 kHz, R
=
20Ω
S
25
Voltage Noise
i
n
Input-Referred f=1 kHz
0.0015
Current Noise
f
max
Full Power Bandwidth C
=
L
20 pF, R
=
20 kΩ 120 kHz
L
Amp-to-Amp Isolation (Note 9) 150 dB
THD Total Harmonic A
=
V
+1, V
=
5V
IN
PP
0.005
%
Distortion f=1 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, 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 of 150˚C. Output currents in excess of
Note 4: The maximum power dissipationisafunction 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: Do not short circuit output to V+, when V+ is greater than 13V or reliability will be adversely affected.
Note 8: Slew rate is the slower of the rising and falling slew rates.
Note 9: Input referred, V+=10V and R
Note 10: Limiting input pin current is only necessary for input voltages that exceed absolute maximum input voltage ratings.
Note 11: V
Note 12: V
is the differential voltage on the non-inverting input with respect to the inverting input.
ID
is the input voltage.
I
=
100 kΩ connected to 5V. Each amp excited in turn with 1 kHz to produce about 10 V
L
, θJA, and TA. The maximum allowable power dissipation at any ambient temperature is P
J(max)
±
30 mA over long term may adversely affect reliability.
PP
output.
=
(T
D
L
J(max)
>
www.national.com7
Typical Performance Characteristics (V
otherwise specified)
=
+5V, single supply, T
S
=
25˚C, and R
A
to ground unless
L
Supply Current vs
Supply Voltage
Positive Output Voltage
Swing vs Supply Voltage
DS012867-5
DS012867-8
Input Current vs
Temperature
Output Voltage Swing vs
Supply Voltage
DS012867-6
DS012867-9
Negative Output Voltage
Swing vs Supply Voltage
DS012867-7
Output Voltage Swing vs
Supply Voltage
DS012867-10
Input Offset Voltage vs
Temperature
DS012867-11
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Slew Rate vs
Supply Voltage
DS012867-12
CMRR vs Input
Common Mode Voltage
=
(V
2.7V)
S
DS012867-13
Typical Performance Characteristics (V
otherwise specified) (Continued)
=
+5V, single supply, T
S
=
25˚C, and R
A
to ground unless
L
CMRR vs Input
Common Mode Voltage
=
(V
5V)
S
Input Voltage vs
Output Voltage
DS012867-14
DS012867-17
CMRR vs Input
Common Mode Voltage
=
(V
10V)
S
Input Voltage vs
Output Voltage
DS012867-15
DS012867-18
Input Voltage vs
Output Voltage
DS012867-16
Sourcing Current vs
Output Voltage
DS012867-19
Sinking Current vs
Output Voltage
DS012867-20
CMRR vs Frequency
DS012867-21
PSRR vs Frequency
DS012867-22
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Typical Performance Characteristics (V
otherwise specified) (Continued)
=
+5V, single supply, T
S
=
25˚C, and R
A
to ground unless
L
Gain/Phase Response vs
Temperature
Input Voltage Noise
vs Frequency
DS012867-23
DS012867-26
Unity Gain
Frequency vs Temperature
Gain/Phase vs
Capacitive Load
DS012867-24
DS012867-27
Crosstalk Rejection
vs Frequency
DS012867-25
THD vs Frequency
DS012867-28
Output Swing vs Frequency
DS012867-29
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Small Signal Step Response
=
±
V
1.35V, A
S
=
Z
10 kΩ || 20 pF, V
L
V
=
+1,
=
0.1 V
IN
PP
DS012867-30
Typical Performance Characteristics (V
otherwise specified) (Continued)
=
+5V, single supply, T
S
=
25˚C, and R
A
to ground unless
L
Small Signal Step Response
=
±
V
S
=
Z
10 kΩ || 20 pF, V
L
Large Signal Step Response
=
±
V
S
=
Z
10 kΩ || 20 pF, V
L
2.5V, A
1.35V, A
=
+1,
V
V
=
0.1 V
IN
=
+1,
=
1V
IN
Small Signal Step Response
=
V
S
PP
DS012867-31
PP
DS012867-33
=
Z
L
Large Signal Step Response
=
V
S
=
Z
L
=
±
5V, A
10 kΩ || 20 pF, V
±
2.5V, A
10 kΩ || 20 pF, V
+1,
V
=
+1,
V
=
0.1 V
IN
IN
=
2.4 V
PP
DS012867-32
PP
DS012867-34
Large Signal Step Response
=
V
S
=
Z
L
=
±
5V, A
10 kΩ || 20 pF, V
+1,
V
=
5.5 V
IN
PP
DS012867-35
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Typical Performance Characteristics (V
otherwise specified) (Continued)
=
+5V, single supply, T
S
=
25˚C, and R
A
to ground unless
L
Stability vs Capacitive Load
Application Information
Stability vs Capacitive Load
DS012867-36
Low Noise Single Supply Preamp
DS012867-37
It is generally difficult to find already existing solutions in the
market which are single supply and low noise. The circuit
above is a low noise single supply preamp using the
LMC272. It utilizes the feature of input common mode voltage range to ground to achieve zero-volt-in zero-volt-out
performance and uses the RR output swing to achieve maximum dynamic range. By introducing a differential pair operating at high bias current as the front end, the equivalent input noise voltage, e
www.national.com 12
, is reduced. The gain is 1 + R5/R6
n
DS012867-2
which is a 1000 in this case. There is an inherent trade off
between noise voltage and power consumption, input bias
current, and input noise current. Input equivalent noise current is inconsequential if the source impedance is small. R1
can be adjusted to vary bias current. To avoid saturation, R3
and R4 should be set such that Q1 and Q3 collector voltages
do not exceed 0.5V.
Table1
shows typical noise data for two
different R1 settings:
Application Information (Continued)
TABLE 1. Equivalent Input Noise Voltage, e
Ω mA nV/√Hz
R1 IC(Q1, 3) en(100 Hz) en(1 kHz) en(10 kHz)
270 1.85 3.2 2.0 1.7
1000 0.50 5.3 2.4 1.9
Single Supply Twin-T Notch Filter with “Q” Adjustment
Here is another application for the LMC272. This is a single
supply notch filter set for 60 Hz using the component values
shown, but the frequency can be changed using the equations below. The main feature of this circuit is its ability to adjust the filter selectivity (Q) using RPOT. You can trade off
Table 2
notch depth for Q.
shows data for two different settings. The LMC272 lends itself nicely to general purpose applications like this because it is very well behaved and easy
to use. This filter can operate from 2.7V to 15V supplies.
Component value matching is important to achieve good results. Here R4 is used to set the input to within the common
mode range of the device to allow maximum swing on the
non-inverting input (pin 3). Since R1, R2, and R4 form a voltage divider at low frequencies, C4 is added to introduce a
high frequency attenuation in conjunction with C1, and C3.
R5 and R6 were picked to set the pass band gain to 0 dB.
, for Two Different Values of R1
n
R=R1=R2=2R3
C=C1=C3=C2/2
TABLE 2. Filter Selectivity (Q) vs Notch Depth
Q Notch Depth
0.3 40
617
DS012867-3
(dB)
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Application Information (Continued)
Single Supply Wein_Bridge Oscillator with Amplitude and Frequency Adjustment
f(range)=6.4 kHz to 30 kHz
Amplitude Adjustment (range)=2.8 V
PP
to 8.6 V
PP
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DS012867-4
Physical Dimensions inches (millimeters) unless otherwise noted
8-Lead (0.150" Wide) Molded Small Outline Package, JEDEC
Order Number LMC272CM or LMC272CMX
NS Package Number M08A
8-Lead (0.118" Wide) Molded Mini Small Outline Package
Order Number LMC272CMM or LMC272CMMX
NS Package Number MUA08A
www.national.com15
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
8-Lead (0.300" Wide) Molded Dual-In-Line Package
Order Number LMC272CN
NS Package Number N08E
LIFE SUPPORT POLICY
LMC272 CMOS Dual Low Cost Rail to Rail Output Operational Amplifier
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 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
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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Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: support@nsc.com
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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