LMP7715/LMP7716
Single and Dual Precision, 17 MHz, Low Noise, CMOS
Input Amplifiers
General Description
The LMP7715/LMP7716 are single and dual low noise, low
offset, CMOS input, rail-to-rail output precision amplifiers
with high gain bandwidth products. The LMP7715/LMP7716
are part of the LMPprecision amplifier family and are ideal
for a variety of instrumentation applications.
Utilizing a CMOS input stage, the LMP7715/LMP7716
achieve an input bias current of 100 fA, an input referred
voltage noise of 5.8 nV/ , and an input offset voltage of
less than ±150 µV. These features make the LMP7715/
LMP7716 superior choices for precision applications.
Consuming only 1.15 mA of supply current, the LMP7715
offers a high gain bandwidth product of 17 MHz, enabling
accurate amplification at high closed loop gains.
The LMP7715/LMP7716 have a supply voltage range of
1.8V to 5.5V, which makes these ideal choices for portable
low power applications with low supply voltage require-
ments.
The LMP7715/LMP7716 are built with National’s advanced
VIP50 process technology. The LMP7715 is offered in a
5-pin SOT23 package and the LMP7716 is offered in an
8-pin MSOP.
Features
Unless otherwise noted, typical values at V
S
=5V.
nInput offset voltage ±150 µV (max)
nInput bias current 100 fA
nInput voltage noise 5.8 nV/
nGain bandwidth product 17 MHz
nSupply current (LMP7715) 1.15 mA
nSupply current (LMP7716) 1.30 mA
nSupply voltage range 1.8V to 5.5V
nTHD+N @f = 1 kHz 0.001%
nOperating temperature range −40oC to 125˚C
nRail-to-rail output swing
nSpace saving SOT23 package (LMP7715)
nMSOP-8 package (LMP7716)
Applications
nActive filters and buffers
nSensor interface applications
nTransimpedance amplifiers
Typical Performance
Offset Voltage Distribution Input Referred Voltage Noise
20183622 20183639
LMPis a trademark of National Semiconductor Corporation.
May 2006
LMP7715/LMP7716 Precision, 17 MHz, Low Noise, CMOS Input Amplifiers
© 2006 National Semiconductor Corporation DS201836 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)
Human Body Model 2000V
Machine Model 200V
V
IN
Differential ±0.3V
Supply Voltage (V
S
=V
+
–V
) 6.0V
Voltage on Input/Output Pins V
+
+0.3V, V
−0.3V
Storage Temperature Range −65˚C to 150˚C
Junction Temperature (Note 3) +150˚C
Soldering Information
Infrared or Convection (20 sec) 235˚C
Wave Soldering Lead Temp. (10
sec) 260˚C
Operating Ratings (Note 1)
Temperature Range (Note 3) −40˚C to 125˚C
Supply Voltage (V
S
=V
+
–V
)
0˚C T
A
125˚C 1.8V to 5.5V
−40˚C T
A
125˚C 2.0V to 5.5V
Package Thermal Resistance (θ
JA
(Note 3))
5-Pin SOT23 180˚C/W
8-Pin MSOP 236˚C/W
2.5V Electrical Characteristics
Unless otherwise specified, all limits are guaranteed for T
A
= 25˚C, V
+
= 2.5V, V
=0V,V
O
=V
CM
=V
+
/2. Boldface limits ap-
ply at the temperature extremes.
Symbol Parameter Conditions Min
(Note 5)
Typ
(Note 4)
Max
(Note 5)
Units
V
OS
Input Offset Voltage ±20 ±180
±480 µV
TC V
OS
Input Offset Voltage Drift
(Note 6)
LMP7715 1 ±4 µV/˚C
LMP7716 1.75
I
B
Input Bias Current V
CM
=1V
(Notes 7, 8)
0.05 50
100 pA
I
OS
Input Offset Current V
CM
=1V
(Note 8)
0.006 25
50 pA
CMRR Common Mode Rejection Ratio 0V V
CM
1.4V 83
80
100 dB
PSRR Power Supply Rejection Ratio 2.0V V
+
5.5V
V
= 0V, V
CM
=0
85
80
100
dB
1.8V V
+
5.5V
V
= 0V, V
CM
=0
85 98
CMVR Input Common-Mode Voltage
Range
CMRR 80 dB
CMRR 78 dB
−0.3
0.3
1.5
1.5 V
A
VOL
Large Signal Voltage Gain LMP7715, V
O
= 0.15 to 2.2V
R
L
=2kto V
+
/2
88
82
98
dB
LMP7716, V
O
= 0.15 to 2.2V
R
L
=2kto V
+
/2
84
80
92
LMP7715, V
O
= 0.15 to 2.2V
R
L
=10kto V
+
/2
92
88
110
LMP7716, V
O
= 0.15 to 2.2V
R
L
=10kto V
+
/2
90
86
95
V
O
Output Swing High R
L
=2kto V
+
/2 70
77
25
mV
from V
+
R
L
=10kto V
+
/2 60
66
20
Output Swing Low R
L
=2kto V
+
/2 30 70
73 mV
R
L
=10kto V
+
/2 15 60
62
LMP7715/LMP7716
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2.5V Electrical Characteristics (Continued)
Unless otherwise specified, all limits are guaranteed for T
A
= 25˚C, V
+
= 2.5V, V
=0V,V
O
=V
CM
=V
+
/2. Boldface limits ap-
ply at the temperature extremes.
Symbol Parameter Conditions Min
(Note 5)
Typ
(Note 4)
Max
(Note 5)
Units
I
O
Output Short Circuit Current Sourcing to V
V
IN
= 200 mV (Note 9)
36
30
52
mA
Sinking to V
+
V
IN
= −200 mV (Note 9)
7.5
5.0
15
I
S
Supply Current LMP7715 0.95 1.30
1.65 mA
LMP7716 (per channel) 1.10 1.50
1.85
SR Slew Rate A
V
= +1, Rising (10% to 90%) 8.3 V/µs
A
V
= +1, Falling (90% to 10%) 10.3
GBW Gain Bandwidth Product 14 MHz
e
n
Input-Referred Voltage Noise f = 400 Hz 6.8 nV/
f = 1 kHz 5.8
i
n
Input-Referred Current Noise f = 1 kHz 0.01 pA/
THD+N Total Harmonic Distortion +
Noise
f = 1 kHz, A
V
=1,R
L
= 100 k
V
O
= 0.9 V
PP
0.003
%
f = 1 kHz, A
V
=1,R
L
= 600
V
O
= 0.9 V
PP
0.004
5V Electrical Characteristics
Unless otherwise specified, all limits are guaranteed for T
A
= 25˚C, V
+
= 5V, V
= 0V, V
CM
=V
+
/2. Boldface limits apply at the
temperature extremes.
Symbol Parameter Conditions Min
(Note 5)
Typ
(Note 4)
Max
(Note 5)
Units
V
OS
Input Offset Voltage ±10 ±150
±450 µV
TC V
OS
Input Offset Average Drift
(Note 6)
LMP7715 1 ±4 µV/˚C
LMP7716 1.75
I
B
Input Bias Current (Notes 7, 8) 0.1 50
100 pA
I
OS
Input Offset Current (Note 8) 0.01 25
50 pA
CMRR Common Mode Rejection
Ratio
0V V
CM
3.7V 85
82
100 dB
PSRR Power Supply Rejection Ratio 2.0V V
+
5.5V
V
= 0V, V
CM
=0
85
80
100
dB
1.8V V
+
5.5V
V
= 0V, V
CM
=0
85 98
CMVR Input Common-Mode Voltage
Range
CMRR 80 dB
CMRR 78 dB
−0.3
0.3
4
4V
A
VOL
Large Signal Voltage Gain LMP7715, V
O
= 0.3 to 4.7V
R
L
=2kto V
+
/2
88
82
107
dB
LMP7716, V
O
= 0.3 to 4.7V
R
L
=2kto V
+
/2
84
80
90
LMP7715, V
O
= 0.3 to 4.7V
R
L
=10kto V
+
/2
92
88
110
LMP7716, V
O
= 0.3 to 4.7V
R
L
=10kto V
+
/2
90
86
95
LMP7715/LMP7716
www.national.com3
5V Electrical Characteristics (Continued)
V
O
Output Swing High R
L
=2kto V
+
/2 70
77
32
mV
from V
+
R
L
=10kto V
+
/2 60
66
22
Output Swing Low R
L
=2kto V
+
/2
(LMP7715)
42 70
73
mV
R
L
=2kto V
+
/2
(LMP7716)
50 75
78
R
L
=10kto V
+
/2 20 60
62
I
O
Output Short Circuit Current Sourcing to V
V
IN
= 200 mV (Note 9)
46
38
66
mA
Sinking to V
+
V
IN
= −200 mV (Note 9)
10.5
6.5
23
I
S
Supply Current LMP7715 1.15 1.40
1.75 mA
LMP7716 (per channel) 1.30 1.70
2.05
SR Slew Rate A
V
= +1, Rising (10% to 90%) 6.0 9.5 V/µs
A
V
= +1, Falling (90% to 10%) 7.5 11.5
GBW Gain Bandwidth Product 17 MHz
e
n
Input-Referred Voltage Noise f = 400 Hz 7.0 nV/
f = 1 kHz 5.8
i
n
Input-Referred Current Noise f = 1 kHz 0.01 pA/
THD+N Total Harmonic Distortion +
Noise
f = 1 kHz, A
V
=1,R
L
= 100 k
V
O
=4V
PP
0.001
%
f = 1 kHz, A
V
=1,R
L
= 600
V
O
=4V
PP
0.004
LMP7715/LMP7716
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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 Tables.
Note 2: Human Body Model is 1.5 kin series with 100 pF. Machine Model is 0in series with 200 pF.
Note 3: The maximum power dissipation is a function of TJ(MAX),θJA. The maximum allowable power dissipation at any ambient temperature is
PD=(T
J(MAX) -T
A)/θJA. All numbers apply for packages soldered directly onto a PC Board.
Note 4: Typical values represent the most likely parametric norm at the time of characterization.
Note 5: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlations using the Statistical Quality
Control (SQC) method.
Note 6: Offset voltage average drift is determined by dividing the change in VOS at the temperature extremes by the total temperature change.
Note 7: Positive current corresponds to current flowing into the device.
Note 8: Guaranteed by design.
Note 9: The short circuit test is a momentary open loop test.
Connection Diagrams
5-Pin SOT23 8-Pin MSOP
20183601
Top View
20183602
Top View
Ordering Information
Package Part Number Package Marking Transport Media NSC Drawing
5-Pin SOT23 LMP7715MF AV3A 1k Units Tape and Reel MF05A
LMP7715MFX 3k Units Tape and Reel
8-Pin MSOP LMP7716MM AX3A 1k Units Tape and Reel MUA08A
LMP7716MMX 3.5k Units Tape and Reel
LMP7715/LMP7716
www.national.com5
Typical Performance Characteristics Unless otherwise noted: T
A
= 25˚C, V
S
= 5V, V
CM
=V
S
/2.
Offset Voltage Distribution TCV
OS
Distribution (LMP7715)
20183681 20183603
Offset Voltage Distribution TCV
OS
Distribution (LMP7716)
20183622 20183680
Offset Voltage vs. V
CM
Offset Voltage vs. V
CM
20183610 20183611
LMP7715/LMP7716
www.national.com 6
Typical Performance Characteristics Unless otherwise noted: T
A
= 25˚C, V
S
= 5V, V
CM
=
VS/2. (Continued)
Offset Voltage vs. V
CM
Offset Voltage vs. Supply Voltage
20183612 20183621
Offset Voltage vs. Temperature CMRR vs. Frequency
20183609 20183656
Input Bias Current vs. V
CM
Input Bias Current vs. V
CM
20183623 20183624
LMP7715/LMP7716
www.national.com7
Typical Performance Characteristics Unless otherwise noted: T
A
= 25˚C, V
S
= 5V, V
CM
=
VS/2. (Continued)
Supply Current vs. Supply Voltage (LMP7715) Supply Current vs. Supply Voltage (LMP7716)
20183605 20183677
Crosstalk Rejection Ratio (LMP7716) Sourcing Current vs. Supply Voltage
20183676 20183620
Sinking Current vs. Supply Voltage Sourcing Current vs. Output Voltage
20183619 20183650
LMP7715/LMP7716
www.national.com 8
Typical Performance Characteristics Unless otherwise noted: T
A
= 25˚C, V
S
= 5V, V
CM
=
VS/2. (Continued)
Sinking Current vs. Output Voltage Output Swing High vs. Supply Voltage
20183654 20183617
Output Swing Low vs. Supply Voltage Output Swing High vs. Supply Voltage
20183615 20183616
Output Swing Low vs. Supply Voltage Output Swing High vs. Supply Voltage
20183614 20183618
LMP7715/LMP7716
www.national.com9
Typical Performance Characteristics Unless otherwise noted: T
A
= 25˚C, V
S
= 5V, V
CM
=
VS/2. (Continued)
Output Swing Low vs. Supply Voltage Open Loop Frequency Response
20183613 20183641
Open Loop Frequency Response Phase Margin vs. Capacitive Load
20183673 20183645
Phase Margin vs. Capacitive Load Overshoot and Undershoot vs. Capacitive Load
20183646 20183630
LMP7715/LMP7716
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Typical Performance Characteristics Unless otherwise noted: T
A
= 25˚C, V
S
= 5V, V
CM
=
VS/2. (Continued)
Slew Rate vs. Supply Voltage Small Signal Step Response
20183629
20183638
Large Signal Step Response Small Signal Step Response
20183637 20183633
Large Signal Step Response THD+N vs. Output Voltage
20183634
20183626
LMP7715/LMP7716
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Typical Performance Characteristics Unless otherwise noted: T
A
= 25˚C, V
S
= 5V, V
CM
=
VS/2. (Continued)
THD+N vs. Output Voltage THD+N vs. Frequency
20183604 20183657
THD+N vs. Frequency PSRR vs. Frequency
20183655 20183628
Input Referred Voltage Noise vs. Frequency Closed Loop Frequency Response
20183639 20183636
LMP7715/LMP7716
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Typical Performance Characteristics Unless otherwise noted: T
A
= 25˚C, V
S
= 5V, V
CM
=
VS/2. (Continued)
Closed Loop Output Impedance vs. Frequency
20183632
LMP7715/LMP7716
www.national.com13
Application Information
LMP7715/LMP7716
The LMP7715/LMP7716 are single and dual, low noise, low
offset, rail-to-rail output precision amplifiers with a wide gain
bandwidth product of 17 MHz and low supply current. The
wide bandwidth makes the LMP7715/LMP7716 ideal
choices for wide-band amplification in portable applications.
The LMP7715/LMP7716 are superior for sensor applica-
tions. The very low input referred voltage noise of only 5.8
nV/ at 1 kHz and very low input referred current noise
of only 10 fA/ mean more signal fidelity and higher
signal-to-noise ratio.
The LMP7715/LMP7716 have a supply voltage range of
1.8V to 5.5V over a wide temperature range of 0˚C to 125˚C.
This is optimal for low voltage commercial applications. For
applications where the ambient temperature might be less
than 0˚C, the LMP7715/LMP7716 are fully operational at
supply voltages of 2.0V to 5.5V over the temperature range
of −40˚C to 125˚C.
The outputs of the LMP7715/LMP7716 swing within 25 mV
of either rail providing maximum dynamic range in applica-
tions requiring low supply voltage. The input common mode
range of the LMP7715/LMP7716 extends to 300 mV below
ground. This feature enables users to utilize this device in
single supply applications.
The use of a very innovative feedback topology has en-
hanced the current drive capability of the LMP7715/
LMP7716, resulting in sourcing currents of as much as 47
mA with a supply voltage of only 1.8V.
The LMP7715 is offered in the space saving SOT23 pack-
age and the LMP7716 is offered in an 8-pin MSOP. These
small packages are ideal solutions for applications requiring
minimum PC board footprint.
CAPACITIVE LOAD
The unity gain follower is the most sensitive configuration to
capacitive loading. The combination of a capacitive load
placed directly on the output of an amplifier along with the
output impedance of the amplifier creates a phase lag which
in turn reduces the phase margin of the amplifier. If phase
margin is significantly reduced, the response will be either
underdamped or the amplifier will oscillate.
The LMP7715/LMP7716 can directly drive capacitive loads
of up to 120 pF without oscillating. To drive heavier capaci-
tive loads, an isolation resistor, R
ISO
as shown in Figure 1,
should be used. This resistor and C
L
form a pole and hence
delay the phase lag or increase the phase margin of the
overall system. The larger the value of R
ISO
, the more stable
the output voltage will be. However, larger values of R
ISO
result in reduced output swing and reduced output current
drive.
INPUT CAPACITANCE
CMOS input stages inherently have low input bias current
and higher input referred voltage noise. The LMP7715/
LMP7716 enhance this performance by having the low input
bias current of only 50 fA, as well as, a very low input
referred voltage noise of 5.8 nV/ . In order to achieve
this a larger input stage has been used. This larger input
stage increases the input capacitance of the LMP7715/
LMP7716. Figure 2 shows typical input common mode ca-
pacitance of the LMP7715/LMP7716.
This input capacitance will interact with other impedances,
such as gain and feedback resistors which are seen on the
inputs of the amplifier, to form a pole. This pole will have little
or no effect on the output of the amplifier at low frequencies
and under DC conditions, but will play a bigger role as the
frequency increases. At higher frequencies, the presence of
this pole will decrease phase margin and also cause gain
peaking. In order to compensate for the input capacitance,
care must be taken in choosing feedback resistors. In addi-
tion to being selective in picking values for the feedback
resistor, a capacitor can be added to the feedback path to
increase stability.
The DC gain of the circuit shown in Figure 3 is simply
−R
2
/R
1
.
20183661
FIGURE 1. Isolating Capacitive Load
20183675
FIGURE 2. Input Common Mode Capacitance
20183664
FIGURE 3. Compensating for Input Capacitance
LMP7715/LMP7716
www.national.com 14
Application Information (Continued)
For the time being, ignore C
F
. The AC gain of the circuit in
Figure 3 can be calculated as follows:
(1)
This equation is rearranged to find the location of the two
poles:
(2)
As shown in Equation (2), as the values of R
1
and R
2
are
increased, the magnitude of the poles are reduced, which in
turn decreases the bandwidth of the amplifier. Figure 4
shows the frequency response with different value resistors
for R
1
and R
2
. Whenever possible, it is best to chose smaller
feedback resistors.
As mentioned before, adding a capacitor to the feedback
path will decrease the peaking. This is because C
F
will form
yet another pole in the system and will prevent pairs of poles,
or complex conjugates from forming. It is the presence of
pairs of poles that cause the peaking of gain. Figure 5 shows
the frequency response of the schematic presented in Figure
3with different values of C
F
. As can be seen, using a small
value capacitor significantly reduces or eliminates the peak-
ing.
TRANSIMPEDANCE AMPLIFIER
In many applications the signal of interest is a very small
amount of current that needs to be detected. Current that is
transmitted through a photodiode is a good example. Bar-
code scanners, light meters, fiber optic receivers, and indus-
trial sensors are some typical applications utilizing photo-
diodes for current detection. This current needs to be
amplified before it can be further processed. This amplifica-
tion is performed using a current-to-voltage converter con-
figuration or transimpedance amplifier. The signal of interest
is fed to the inverting input of an op amp with a feedback
resistor in the current path. The voltage at the output of this
amplifier will be equal to the negative of the input current
times the value of the feedback resistor. Figure 6 shows a
transimpedance amplifier configuration. C
D
represents the
photodiode parasitic capacitance and C
CM
denotes the
common-mode capacitance of the amplifier. The presence of
all of these capacitances at higher frequencies might lead to
less stable topologies at higher frequencies. Care must be
taken when designing a transimpedance amplifier to prevent
the circuit from oscillating.
With a wide gain bandwidth product, low input bias current
and low input voltage and current noise, the LMP7715/
LMP7716 are ideal for wideband transimpedance applica-
tions.
20183659
FIGURE 4. Closed Loop Frequency Response
20183660
FIGURE 5. Closed Loop Frequency Response
LMP7715/LMP7716
www.national.com15
Application Information (Continued)
A feedback capacitance C
F
is usually added in parallel with
R
F
to maintain circuit stability and to control the frequency
response. To achieve a maximally flat, 2
nd
order response,
R
F
and C
F
should be chosen by using Equation (3)
(3)
Calculating C
F
from Equation (3) can sometimes result in
capacitor values which are less than 2 pF. This is especially
the case for high speed applications. In these instances, it is
often more practical to use the circuit shown in Figure 7 in
order to allow more sensible choices for C
F
. The new feed-
back capacitor, C
F
', is (1+ R
B
/R
A
)C
F
. This relationship holds
as long as R
A
<< R
F
.
SENSOR INTERFACE
The LMP7715/LMP7716 have low input bias current and low
input referred noise, which make them ideal choices for
sensor interfaces such as thermopiles, Infra Red (IR) ther-
mometry, thermocouple amplifiers, and pH electrode buffers.
Thermopiles generate voltage in response to receiving ra-
diation. These voltages are often only a few microvolts. As a
result, the operational amplifier used for this application
needs to have low offset voltage, low input voltage noise,
and low input bias current. Figure 8 shows a thermopile
application where the sensor detects radiation from a dis-
tance and generates a voltage that is proportional to the
intensity of the radiation. The two resistors, R
A
and R
B
, are
selected to provide high gain to amplify this signal, while C
F
removes the high frequency noise.
PRECISION RECTIFIER
Rectifiers are electrical circuits used for converting AC sig-
nals to DC signals. Figure 9 shows a full-wave precision
rectifier. Each operational amplifier used in this circuit has a
diode on its output. This means for the diodes to conduct, the
output of the amplifier needs to be positive with respect to
ground. If V
IN
is in its positive half cycle then only the output
of the bottom amplifier will be positive. As a result, the diode
on the output of the bottom amplifier will conduct and the
signal will show at the output of the circuit. If V
IN
is in its
negative half cycle then the output of the top amplifier will be
positive, resulting in the diode on the output of the top
amplifier conducting and delivering the signal from the am-
plifiers output to the circuit’s output.
For R
2
/R
1
2, the resistor values can be found by using the
equation shown in Figure 9.IfR
2
/R
1
= 1, then R
3
should be
left open, no resistor needed, and R
4
should simply be
shorted.
20183669
FIGURE 6. Transimpedance Amplifier
20183631
FIGURE 7. Modified Transimpedance Amplifier
20183627
FIGURE 8. Thermopile Sensor Interface
20183674
FIGURE 9. Precision Rectifier
LMP7715/LMP7716
www.national.com 16
Physical Dimensions inches (millimeters) unless otherwise noted
5-Pin SOT23
NS Package Number MF05A
8-Pin MSOP
NS Package Number MUA08A
LMP7715/LMP7716
www.national.com17
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.
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LMP7715/LMP7716 Precision, 17 MHz, Low Noise, CMOS Input Amplifiers