LM6142,LM6144
LM6142/LM6144 17 MHz Rail-to-Rail Input-Output Operational Amplifiers
Literature Number: SNOS726C
LM6142/LM6144
17 MHz Rail-to-Rail Input-Output Operational Amplifiers
General Description
Using patent pending new circuit topologies, the LM6142/
LM6144 provides new levels of performance in applications
where low voltage supplies or power limitations previously
made compromise necessary. Operating on supplies of 1.8V
to over 24V, the LM6142/LM6144 is an excellent choice for
battery operated systems, portable instrumentation and oth-
ers.
The greater than rail-to-rail input voltage range eliminates
concern over exceeding the common-mode voltage range.
The rail-to-rail output swing provides the maximum possible
dynamic range at the output. This is particularly important
when operating on low supply voltages.
High gain-bandwidth with 650µA/Amplifier supply current
opens new battery powered applications where previous
higher power consumption reduced battery life to unaccept-
able levels. The ability to drive large capacitive loads without
oscillating functionally removes this common problem.
Features
At V
S
= 5V. Typ unless noted.
nRail-to-rail input CMVR −0.25V to 5.25V
nRail-to-rail output swing 0.005V to 4.995V
nWide gain-bandwidth: 17MHz at 50kHz (typ)
nSlew rate:
Small signal, 5V/µs
Large signal, 30V/µs
nLow supply current 650µA/Amplifier
nWide supply range 1.8V to 24V
nCMRR 107dB
nGain 108dB with R
L
= 10k
nPSRR 87dB
Applications
nBattery operated instrumentation
nDepth sounders/fish finders
nBarcode scanners
nWireless communications
nRail-to-rail in-out instrumentation amps
Connection Diagrams
8-Pin CDIP 8-Pin DIP/SO
01205714
Top View
01205701
Top View
14-Pin DIP/SO
01205702
Top View
November 2004
LM6142/LM6144, 17 MHz Rail-to-Rail Input-Output Operational Amplifiers
© 2004 National Semiconductor Corporation DS012057 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) 2500V
Differential Input Voltage 15V
Voltage at Input/Output Pin (V
+
) + 0.3V, (V
−
) − 0.3V
Supply Voltage (V
+
−V
−
) 35V
Current at Input Pin ±10mA
Current at Output Pin (Note 3) ±25mA
Current at Power Supply Pin 50mA
Lead Temperature
(soldering, 10 sec) 260˚C
Storage Temp. Range −65˚C to +150˚C
Junction Temperature (Note 4) 150˚C
Operating Ratings (Note 1)
Supply Voltage 1.8V ≤V
+
≤24V
Temperature Range
LM6142, LM6144 −40˚C ≤T
A
≤+85˚C
Thermal Resistance (θ
JA
)
N Package, 8-Pin Molded DIP 115˚C/W
M Package, 8-Pin Surface
Mount 193˚C/W
N Package, 14-Pin Molded
DIP 81˚C/W
M Package, 14-Pin Surface
Mount 126˚C/W
5.0V DC Electrical Characteristics (Note 8)
Unless otherwise specified, all limits guaranteed for T
A
= 25˚C, V
+
= 5.0V, V
−
= 0V, V
CM
=V
O
=V
+
/2 and R
L
>1MΩto V
+
/2.
Boldface limits apply at the temperature extremes.
LM6144AI LM6144BI
Symbol Parameter Conditions Typ LM6142AI LM6142BI Units
(Note 5) Limit Limit
(Note 6) (Note 6)
V
OS
Input Offset Voltage 0.3 1.0 2.5 mV
2.2 3.3 max
TCV
OS
Input Offset Voltage 3µV/˚C
Average Drift
I
B
Input Bias Current 170 250 300 nA
max
0V ≤V
CM
≤5V 180 280
526 526
I
OS
Input Offset Current 3 30 30 nA
80 80 max
R
IN
Input Resistance, C
M
126 MΩ
CMRR Common Mode 0V ≤V
CM
≤4V 107 84 84
dB
min
Rejection Ratio 78 78
0V ≤V
CM
≤5V 82 66 66
79 64 64
PSRR Power Supply 5V ≤V
+
≤24V 87 80 80
Rejection Ratio 78 78
V
CM
Input Common-Mode −0.25 00V
Voltage Range 5.25 5.0 5.0
A
V
Large Signal R
L
= 10k 270 100 80 V/mV
Voltage Gain 70 33 25 min
V
O
Output Swing R
L
= 100k 0.005 0.01 0.01 V
0.013 0.013 max
4.995 4.98 4.98 V
4.93 4.93 min
R
L
= 10k 0.02 V max
4.97 V min
R
L
= 2k 0.06 0.1 0.1 V
0.133 0.133 max
4.90 4.86 4.86 V
LM6142/LM6144
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5.0V DC Electrical Characteristics (Note 8) (Continued)
Unless otherwise specified, all limits guaranteed for T
A
= 25˚C, V
+
= 5.0V, V
−
= 0V, V
CM
=V
O
=V
+
/2 and R
L
>1MΩto V
+
/2.
Boldface limits apply at the temperature extremes.
LM6144AI LM6144BI
Symbol Parameter Conditions Typ LM6142AI LM6142BI Units
(Note 5) Limit Limit
(Note 6) (Note 6)
4.80 4.80 min
I
SC
Output Short Sourcing 13 10 8 mA
Circuit Current 4.9 4 min
LM6142 35 35 mA
max
Sinking 24 10 10 mA
5.3 5.3 min
35 35 mA
max
I
SC
Output Short Sourcing 8 6 6 mA
Circuit Current 33min
LM6144 35 35 mA
max
Sinking 22 8 8 mA
44min
35 35 mA
max
I
S
Supply Current Per Amplifier 650 800 800 µA
880 880 max
5.0V AC Electrical Characteristics (Note 8)
Unless Otherwise Specified, All Limits Guaranteed for T
A
= 25˚C, V
+
= 5.0V, V
−
= 0V, V
CM
=V
O
=V
+
/2 and R
L
>1MΩto
V
+
/2. Boldface limits apply at the temperature extremes.
LM6144AI LM6144BI
Symbol Parameter Conditions Typ LM6142AI LM6142BI Units
(Note 5) Limit Limit
(Note 6) (Note 6)
SR Slew Rate 8 V
PP
@V
+
12V 25 15 13 V/µs
R
S
>1kΩ13 11 min
GBW Gain-Bandwidth Product f = 50 kHz 17 10 10 MHz
66min
φ
m
Phase Margin 38 Deg
Amp-to-Amp Isolation 130 dB
e
n
Input-Referred f=1kHz 16
Voltage Noise
i
n
Input-Referred f=1kHz 0.22
Current Noise
T.H.D. Total Harmonic Distortion f = 10 kHz, R
L
=10kΩ, 0.003 %
LM6142/LM6144
www.national.com3
2.7V DC Electrical Characteristics (Note 8)
Unless Otherwise Specified, All Limits Guaranteed for T
A
= 25˚C, V
+
= 2.7V, V
−
= 0V, V
CM
=V
O
=V
+
/2 and R
L
>1MΩto
V
+
/2. Boldface limits apply at the temperature extreme
LM6144AI LM6144BI
Symbol Parameter Conditions Typ LM6142AI LM6142BI Units
(Note 5) Limit Limit
(Note 6) (Note 6)
V
OS
Input Offset Voltage 0.4 1.8 2.5 mV
4.3 5 max
I
B
Input Bias Current 150 250 300 nA
526 526 max
I
OS
Input Offset Current 4 30 30 nA
80 80 max
R
IN
Input Resistance 128 MΩ
CMRR Common Mode 0V ≤V
CM
≤1.8V 90 dB
min
Rejection Ratio 0V ≤V
CM
≤2.7V 76
PSRR Power Supply 3V ≤V+ ≤5V 79
Rejection Ratio
V
CM
Input Common-Mode −0.25 0 0 V min
Voltage Range 2.95 2.7 2.7 V max
A
V
Large Signal R
L
= 10k 55 V/mV
Voltage Gain min
V
O
Output Swing R
L
= 100kΩ0.019 0.08 0.08 V
0.112 0.112 max
2.67 2.66 2.66 V
2.25 2.25 min
I
S
Supply Current Per Amplifier 510 800 800 µA
880 880 max
2.7V AC Electrical Characteristics (Note 8)
Unless Otherwise Specified, All Limits Guaranteed for T
A
= 25˚C, V
+
= 2.7V, V
−
= 0V, V
CM
=V
O
=V
+
/2 and R
L
>1MΩto
V
+
/2. Boldface limits apply at the temperature extreme
LM6144AI LM6144BI
Symbol Parameter Conditions Typ LM6142AI LM6142BI Units
(Note 5) Limit Limit
(Note 6) (Note 6)
GBW Gain-Bandwidth Product f = 50 kHz 9 MHz
φ
m
Phase Margin 36 Deg
G
m
Gain Margin 6 dB
LM6142/LM6144
www.national.com 4
24V Electrical Characteristics (Note 8)
Unless Otherwise Specified, All Limits Guaranteed for T
A
= 25˚C, V
+
= 24V, V
−
= 0V, V
CM
=V
O
=V
+
/2 and R
L
>1MΩto
V
+
/2. Boldface limits apply at the temperature extreme
LM6144AI LM6144BI
Symbol Parameter Conditions Typ LM6142AI LM6142BI Units
(Note 5) Limit Limit
(Note 6) (Note 6)
V
OS
Input Offset Voltage 1.3 2 3.8 mV
4.8 4.8 max
I
B
Input Bias Current 174 nA
max
I
OS
Input Offset Current 5 nA
max
R
IN
Input Resistance 288 MΩ
CMRR Common Mode 0V ≤V
CM
≤23V 114 dB
min
Rejection Ratio 0V ≤V
CM
≤24V 100
PSRR Power Supply 0V ≤V
CM
≤24V 87
Rejection Ratio
V
CM
Input Common-Mode −0.25 0 0 V min
Voltage Range 24.25 24 24 V max
A
V
Large Signal R
L
= 10k 500 V/mV
Voltage Gain min
V
O
Output Swing R
L
=10kΩ0.07 0.15 0.15 V
0.185 0.185 max
23.85 23.81 23.81 V
23.62 23.62 min
I
S
Supply Current Per Amplifier 750 1100 1100 µA
1150 1150 max
GBW Gain-Bandwidth Product f = 50 kHz 18 MHz
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 Charactenstics.
Note 2: Human body model, 1.5kΩin series with 100pF.
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.
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: For guaranteed military specifications see military datasheet MNLM6142AM-X.
Note 8: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of
the device such that TJ=T
A. No guarantee of parametric performance is indicated in the electrical tables under conditions of the internal self heating where TJ>
TA.
LM6142/LM6144
www.national.com5
Typical Performance Characteristics T
A
= 25˚C, R
L
=10kΩUnless Otherwise Specified
Supply Current vs. Supply Voltage Offset Voltage vs. Supply Voltage
01205715 01205716
Bias Current vs. Supply Voltage Offset Voltage vs. V
CM
01205717 01205718
Offset Voltage vs. V
CM
Offset Voltage vs. V
CM
01205719 01205720
LM6142/LM6144
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Typical Performance Characteristics T
A
= 25˚C, R
L
=10kΩUnless Otherwise
Specified (Continued)
Bias Current vs. V
CM
Bias Current vs. V
CM
01205721 01205722
Bias Current vs. V
CM
Open-Loop Transfer Function
01205723 01205724
Open-Loop Transfer Function Open-Loop Transfer Function
01205725 01205726
LM6142/LM6144
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Typical Performance Characteristics T
A
= 25˚C, R
L
=10kΩUnless Otherwise
Specified (Continued)
Output Voltage vs. Source Current Output Voltage vs. Source Current
01205727 01205729
Output Voltage vs. Source Current Output Voltage vs. Sink Current
01205728 01205730
Output Voltage vs. Sink Current Output Voltage vs. Sink Current
01205731 01205732
LM6142/LM6144
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Typical Performance Characteristics T
A
= 25˚C, R
L
=10kΩUnless Otherwise
Specified (Continued)
Gain and Phase vs. Load Gain and Phase vs. Load
01205733 01205734
Distortion + Noise vs. Frequency GBW vs. Supply
01205735 01205736
Open Loop Gain vs. Load, 3V Supply Open Loop Gain vs. Load, 5V Supply
01205737 01205738
LM6142/LM6144
www.national.com9
Typical Performance Characteristics T
A
= 25˚C, R
L
=10kΩUnless Otherwise
Specified (Continued)
Open Loop Gain vs. Load, 24V Supply Unity Gain Frequency vs. V
S
01205739 01205740
CMRR vs. Frequency Crosstalk vs. Frequency
01205741 01205742
PSRR vs. Frequency Noise Voltage vs. Frequency
01205743 01205744
LM6142/LM6144
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Typical Performance Characteristics T
A
= 25˚C, R
L
=10kΩUnless Otherwise
Specified (Continued)
Noise Current vs. Frequency NF vs. R
Source
01205745 01205712
LM6142/LM6144 Application Ideas
The LM6142 brings a new level of ease of use to op amp
system design.
With greater than rail-to-rail input voltage range concern
over exceeding the common-mode voltage range is elimi-
nated.
Rail-to-rail output swing provides the maximum possible dy-
namic range at the output. This is particularly important
when operating on low supply voltages.
The high gain-bandwidth with low supply current opens new
battery powered applications, where high power consump-
tion, previously reduced battery life to unacceptable levels.
To take advantage of these features, some ideas should be
kept in mind.
ENHANCED SLEW RATE
Unlike most bipolar op amps, the unique phase reversal
prevention/speed-up circuit in the input stage causes the
slew rate to be very much a function of the input signal
amplitude.
Figure 2 shows how excess input signal, is routed around
the input collector-base junctions, directly to the current
mirrors.
The LM6142/LM6144 input stage converts the input voltage
change to a current change. This current change drives the
current mirrors through the collectors of Q1–Q2, Q3–Q4
when the input levels are normal.
If the input signal exceeds the slew rate of the input stage,
the differential input voltage rises above two diode drops.
This excess signal bypasses the normal input transistors,
(Q1–Q4), and is routed in correct phase through the two
additional transistors, (Q5, Q6), directly into the current mir-
rors.
This rerouting of excess signal allows the slew-rate to in-
crease by a factor of 10 to 1 or more. (See Figure 1.)
As the overdrive increases, the op amp reacts better than a
conventional op amp. Large fast pulses will raise the slew-
rate to around 30V to 60V/µs.
This effect is most noticeable at higher supply voltages and
lower gains where incoming signals are likely to be large.
This new input circuit also eliminates the phase reversal
seen in many op amps when they are overdriven.
This speed-up action adds stability to the system when
driving large capacitive loads.
DRIVING CAPACITIVE LOADS
Capacitive loads decrease the phase margin of all op amps.
This is caused by the output resistance of the amplifier and
the load capacitance forming an R-C phase lag network.
This can lead to overshoot, ringing and oscillation. Slew rate
limiting can also cause additional lag. Most op amps with a
fixed maximum slew-rate will lag further and further behind
when driving capacitive loads even though the differential
input voltage raises. With the LM6142, the lag causes the
slew rate to raise. The increased slew-rate keeps the output
following the input much better. This effectively reduces
phase lag. After the output has caught up with the input, the
differential input voltage drops down and the amplifier settles
rapidly.
Slew Rate vs. ∆V
IN
V
S
=±5V
01205707
FIGURE 1.
LM6142/LM6144
www.national.com11
LM6142/LM6144 Application Ideas
(Continued)
These features allow the LM6142 to drive capacitive loads
as large as 1000pF at unity gain and not oscillate. The scope
photos (Figure 3 and Figure 4) above show the LM6142
driving a l000pF load. In Figure 3, the upper trace is with no
capacitive load and the lower trace is with a 1000pF load.
Here we are operating on ±12V supplies with a 20 V
PP
pulse. Excellent response is obtained with a C
f
of l0pF. In
Figure 4, the supplies have been reduced to ±2.5V, the
pulse is 4 V
PP
and C
f
is 39pF. The best value for the
compensation capacitor is best established after the board
layout is finished because the value is dependent on board
stray capacity, the value of the feedback resistor, the closed
loop gain and, to some extent, the supply voltage.
Another effect that is common to all op amps is the phase
shift caused by the feedback resistor and the input capaci-
tance. This phase shift also reduces phase margin. This
effect is taken care of at the same time as the effect of the
capacitive load when the capacitor is placed across the
feedback resistor.
The circuit shown in Figure 5 was used for these scope
photos.
Typical Applications
FISH FINDER/ DEPTH SOUNDER.
The LM6142/LM6144 is an excellent choice for battery op-
erated fish finders. The low supply current, high gain-
bandwidth and full rail to rail output swing of the LM6142
provides an ideal combination for use in this and similar
applications.
ANALOG TO DIGITAL CONVERTER BUFFER
The high capacitive load driving ability, rail-to-rail input and
output range with the excellent CMR of 82 dB, make the
LM6142/LM6144 a good choice for buffering the inputs of A
to D converters.
3 OP AMP INSTRUMENTATION AMP WITH
RAIL-TO-RAIL INPUT AND OUTPUT
Using the LM6144,a3opampinstrumentation amplifier with
rail-to-rail inputs and rail to rail output can be made. These
features make these instrumentation amplifiers ideal for
single supply systems.
Some manufacturers use a precision voltage divider array of
5 resistors to divide the common-mode voltage to get an
input range of rail-to-rail or greater. The problem with this
method is that it also divides the signal, so to even get unity
gain, the amplifier must be run at high closed loop gains.
This raises the noise and drift by the internal gain factor and
01205706
FIGURE 2.
01205708
FIGURE 3.
01205709
FIGURE 4.
01205710
FIGURE 5.
LM6142/LM6144
www.national.com 12
Typical Applications (Continued)
lowers the input impedance. Any mismatch in these preci-
sion resistors reduces the CMR as well. Using the LM6144,
all of these problems are eliminated.
In this example, amplifiers A and B act as buffers to the
differential stage (Figure 6). These buffers assure that the
input impedance is over 100MΩand they eliminate the
requirement for precision matched resistors in the input
stage. They also assure that the difference amp is driven
from a voltage source. This is necessary to maintain the
CMR set by the matching of R1–R2 with R3–R4.
The gain is set by the ratio of R2/R1 and R3 should equal R1
and R4 equal R2. Making R4 slightly smaller than R2 and
adding a trim pot equal to twice the difference between R2
and R4 will allow the CMR to be adjusted for optimum.
With both rail to rail input and output ranges, the inputs and
outputs are only limited by the supply voltages. Remember
that even with rail-to-rail output, the output can not swing
past the supplies so the combined common mode voltage
plus the signal should not be greater than the supplies or
limiting will occur.
SPICE MACROMODEL
A SPICE macromodel of this and many other National Semi-
conductor op amps is available at no charge from the NSC
Customer Response Group at 800-272-9959.
Ordering Information
Package Temperature Range Temperature Range NSC
Drawing
Industrial Military
−40˚C to +85˚C −55˚C to +125˚C
8-Pin Molded DIP LM6142AIN N08E
LM6142BIN
8-Pin Small Outline LM6142AIM M08A
LM6142AIMX
LM6142BIM
LM6142BIMX
14-Pin Molded DIP LM6144AIN N14A
LM6144BIN
14-Pin Small Outline LM6144AIM M14A
LM6144AIMX
LM6144BIM
LM6144BIMX
8-Pin CDIP LM6142AMJ-QML J08A
01205713
FIGURE 6.
LM6142/LM6144
www.national.com13
Physical Dimensions inches (millimeters)
unless otherwise noted
8-Pin Cerdip
Dual-In-Line Package
NS Package Number J08A
8-Pin Small Outline Package
NS Package Number M08A
LM6142/LM6144
www.national.com 14
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
14-Pin Small Outline Package
NS Package Number M14A
8-Pin Molded Dual-In-Line Package
NS Package Number N08E
LM6142/LM6144
www.national.com15
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
14-Pin Molded Dual-In-Line Package
NS Package Number N14A
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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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.
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National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship
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LM6142/LM6144, 17 MHz Rail-to-Rail Input-Output Operational Amplifiers
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