LMV101/102/105/110
Fixed-Gain Amplifiers
General Description
The LMV101/102/105/110 fixed-gain amplifier family inte-
grates a rail-to-rail op amp, two internal gain-setting resistors
andaV
+
/2 bias circuit into one ultra tiny package, SC70-5 or
SOT23-5. Fixed inverting gains of −1, −2, −5, and −10 are
available.
The core op amp in this series is an LMV321, which provides
rail-to-rail output swing, excellent speed-power ratio, 1MHz
bandwidth, and 1V/µs of slew rate with low supply current.
The LMV101/102/105/110 family reduces external compo-
nent count. It is the most cost effective solution for applica-
tions where low voltage operation, low power consumption,
space savings, and reliable performance are needed. It en-
ables the design of small portable electronic devices, and al-
lows the designer to place the device closer to the signal
source to reduce noise pickup and increase signal integrity.
Features
(For 5V Supply, Typical Unless Otherwise Noted)
nFixed inverting gain available −1,−2,−5,−10
nDC gain accuracy @2.7V supply
— LMV101/102/105 2% (typ)
— LMV110 6% (typ)
nSpace saving packages SC70-5 & SOT23-5
nIndustrial temperature range −40˚C to +85˚C
nLow supply current 130µA
nRail-to-Rail output swing
nGuaranteed 2.7V and 5V performance
Applications
nGeneral purpose portable devices
nMobile communications
nBattery powered electronics
nActive filters
nMicrophone preamplifiers
Typical Application
Phase Inverting AC Amplifier
DS101234-10
V
OUT
= 0.5V
CC
−V
IN
(R
2
/R
1
)
August 2000
LMV101/102/105/110 Fixed-Gain Amplifiers
© 2000 National Semiconductor Corporation DS101234 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)
Machine Model 200V
Human Body Model 1500V
Supply Voltage (V
+
-V
−
) 5.5V
Output Short Circuit to V
+
(Note 3)
Output Short Circuit to V
−
(Note 4)
Mounting Temperature
Infrared or Convection (20 sec) 235˚C
Storage Temperature Range -65˚C to 150˚C
Junction Temperature (T
J
, max)
(Note 5) 150˚C
Operating Ratings (Note 1)
Supply Voltage 2.7V to 5.0V
Temperature Range −40˚C ≤T
J
≤85˚C
Thermal resistance (θ
JA
)
5-pin SC70-5 478˚C/W
5-pin SOT23-5 265˚C/W
2.7V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= 2.7V, V
−
= 0V, V
O
=V
+
/2 and R
L
>1MΩ.Boldface lim-
its apply at the temperature extremes.
Symbol Parameter Conditions Typ
(Note 6) Max
(Note 7) Units
V
O
Output Swing R
L
= 10kΩto 1.35V V
+
−0.01 V
+
−0.1 V
min
0.08 0.18 V
max
I
S
Supply Current 80 170 µA
max
DC Gain Accuracy LMV101, Gain = −1 2 5%
LMV102, Gain = −2 2 5%
LMV105, Gain = −5 2 6%
LMV110, Gain = −10 6 12 %
GBW −3dB Bandwidth LMV101, Gain = −1,
R
L
=2kΩ,C
L
= 100pF 1.6 MHz
LMV102, Gain = −2,
R
L
=2kΩ,C
L
= 100pF 1.8 MHz
LMV105, Gain = −5,
R
L
=2kΩ,C
L
= 100pF 0.8 MHz
LMV110, Gain = −10,
R
L
=2kΩ,C
L
= 100pF 0.2 MHz
5V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= 5V, V
−
= 0V, V
O
=V
+
/2 and R
L
>1MΩ.Boldface limits
apply at the temperature extremes.
Symbol Parameter Conditions Typ
(Note 6) Max
(Note 7) Units
V
O
Output Swing R
L
=2kΩto 2.5V V
+
−0.04 V
+
−0.3
V
+
−0.4 V
min
0.14 0.3
0.4 V
max
R
L
= 10kΩto 2.5V V
+
−0.01 V
+
−0.1
V
+
−0.2 V
min
0.1 0.18
0.28 V
max
I
O
Output Current Sourcing, V
O
=0V 60 5 mA
min
Sinking, V
O
= 5V 160 10 mA
min
LMV101/102/105/110
www.national.com 2
5V Electrical Characteristics (Continued)
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= 5V, V
−
= 0V, V
O
=V
+
/2 and R
L
>1MΩ.Boldface limits
apply at the temperature extremes.
Symbol Parameter Conditions Typ
(Note 6) Max
(Note 7) Units
I
S
Supply Current 130 250
350 µA
max
DC Gain Accuracy LMV101, Gain = −1 3.5 5%
LMV102, Gain = −2 3.5 5%
LMV105, Gain = −5 3.5 6%
LMV110, Gain = −10 9.0 12 %
SR Slew Rate (Note 8) 1 V/µs
GBW −3dB Bandwidth LMV101, Gain = −1,
R
L
=2kΩ,C
L
= 100pF 1.6 MHz
LMV102, Gain = −2,
R
L
=2kΩ,C
L
= 100pF 1.8 MHz
LMV105, Gain = −5,
R
L
=2kΩ,C
L
= 100pF 0.8 MHz
LMV110, Gain = −10,
R
L
=2kΩ,C
L
= 100pF 0.2 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 in-
tended 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, 1.5kΩin series with 100pF. Machine model, 0Ωin series with 100pF.
Note 3: Shorting circuit output to V+will adversely affect reliability.
Note 4: Shorting circuit output to V−will adversely affect reliability.
Note 5: The maximum power dissipation is a function of TJ(max) ,θJA, and TA. The maximum allowable power dissipation at any ambient temperature is
PD=(T
J(max)–T A)/θJA. All numbers apply for packages soldered directly into a PC board.
Note 6: Typical Values represent the most likely parametric norm.
Note 7: All limits are guaranteed by testing or statistical analysis.
Note 8: Number specified is the slower of the positive and negative slew rates.
Typical Performance Characteristics (Unless otherwise specified, V
S
= +5V, single supply, T
A
=
25˚C.)
Supply Current vs.
Supply Voltage
DS101234-22
Sourcing Current
vs. Output Voltage
DS101234-23
LMV101/102/105/110
www.national.com3
Typical Performance Characteristics (Unless otherwise specified, V
S
= +5V, single supply, T
A
=
25˚C.) (Continued)
Sourcing Current vs.
Output Voltage
DS101234-24
Sinking Current vs.
Output Voltage
DS101234-25
Sinking Current vs.
Output Voltage
DS101234-26
Output Voltage Swing vs.
Supply Voltage
DS101234-21
LMV101 Close Loop
Frequency Response
DS101234-27
LMV101 Close Loop
Frequency Response
DS101234-28
LMV101/102/105/110
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Typical Performance Characteristics (Unless otherwise specified, V
S
= +5V, single supply, T
A
=
25˚C.) (Continued)
LMV102 Close Loop
Frequency Response
DS101234-29
LMV102 Close Loop
Frequency Response
DS101234-30
LMV105 Close Loop
Frequency Response
DS101234-31
LMV105 Close Loop
Frequency Response
DS101234-32
LMV110 Close Loop
Frequency Response
DS101234-33
LMV110 Close Loop
Frequency Response
DS101234-34
LMV101/102/105/110
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Typical Performance Characteristics (Unless otherwise specified, V
S
= +5V, single supply, T
A
=
25˚C.) (Continued)
Inverting Large Signal Pulse Response
LMV101
DS101234-35
Inverting Large Signal Pulse Response
LMV102
DS101234-37
Inverting Large Signal Pulse Response
LMV105
DS101234-39
Inverting Large Signal Pulse Response
LMV110
DS101234-41
Inverting Small Signal Pulse Response
LMV101
DS101234-36
Inverting Small Signal Pulse Response
LMV102
DS101234-38
LMV101/102/105/110
www.national.com 6
Typical Performance Characteristics (Unless otherwise specified, V
S
= +5V, single supply, T
A
=
25˚C.) (Continued)
Application Information
The LMV101/102/105/110 integrates a rail-to-rail op amp,
two internal gain-setting resistors and a V
+
/2 bias circuit into
one ultra tiny package, SC70-5 or SOT23-5. With its small
footprint and reduced component count for gain stage, it en-
ables the design of smaller portable electronic products,
such as cellular phones, pagers, PDAs, PCMCIA cards, etc.
In addition, the integration solution minimizes printed circuit
board stray capacitance, and reduces the complexity of cir-
cuit design.
The core op amp of this family is National’s LMV321.
1.0 Supply Bypassing
The application circuits in this datasheet do not show the
power supply connections and the associated bypass ca-
pacitors for simplification. When the circuits are built, it is al-
ways required to have bypass capacitors. Ceramic disc ca-
pacitors (0.1µF) or solid tantalum (1µF) with short leads, and
located close to the IC are usually necessary to prevent in-
terstage coupling through the power supply internal imped-
ance. Inadequate bypassing will manifest itself by a low fre-
quency oscillation or by high frequency instabilities.
Sometimes, a 10µF (or larger) capacitor is used to absorb
low frequency variations and a smaller 0.1µF disc is paral-
leled across it to prevent any high frequency feedback
through the power supply lines.
2.0 Input Voltage Range
The input voltage should be within the supply rails. The ESD
protection circuitry at the input of the device includes a diode
between the input pin and the negative supply pin. Driving
the input more than 0.6V (at 25˚C) beyond the negative sup-
ply will turn on the diode and cause signal distortions. For
applications that require sensing voltages beyond the nega-
tive rail, use the LMV111 with external gain setting resistors.
Inverting Small Signal Pulse Response
LMV105
DS101234-40
Inverting Small Signal Pulse Response
LMV110
DS101234-42
Slew Rate vs.
Supply Voltage
DS101234-43
LMV101/102/105/110
www.national.com7
Application Information (Continued)
3.0 Capacitive Load Tolerance
The LMV101/102/105/110 can directly drive 200pF capaci-
tive load with Vs = 5V at −1 gain configuration without oscil-
lation. Direct capacitive loading reduces the phase margin of
amplifiers. The combination of the amplifier’s output imped-
ance and the capacitive load induces phase lag. This results
in either an underdamped pulse or oscillation. To drive a
heavier capacitive load, a resistive isolation can be used as
shown in
Figure 1
.
The isolation resistor R
iso
and the C
L
form a pole to increase
stability by adding more phase margin to the overall system.
The desired performance depends on the value of R
iso
. The
bigger the R
iso
resistor value, the more stable V
OUT
will be.
Figure 2
is an output waveform of
Figure 1
using 100Ωfor
R
iso
and 1000pF for C
L
.
4.0 Phase Inverting AC Amplifier
A single supply phase inverting AC amplifier can be easily
built with the LMV101/102/105/110 series (
Figure 3
). The
output voltage is biased at mid-supply, andAC input signal is
amplified by (R
2
/R
1
). Capacitor C
IN
acts as an input AC cou-
pling capacitor to block DC potentials.Acapacitor of 0.1µF or
larger can be used. The output can swing rail-to-rail.To avoid
output distortion, the peak-to-peak amplitude of the input AC
signal should be less than V
CC
(R
1
/R
2
).
It is recommended that a small-valued capacitor be used
across the feedback resistor (R
2
) to eliminate stability prob-
lems, prevent peaking of the response, and limit the band-
width of the circuit. This can also help to reduce high fre-
quency noise and some other interference. (See
Figure 4
)
5.0 Microphone preamplifier
Most microphones have a low output voltage level. This out-
put signal needs to be amplified so that it can feed the next
stage with optimal level.
Figure 5
shows a microphone
preamplifier circuit with the LMV110. This microphone
preamplifier can provide 20dB gain. It can be implemented in
PCs, PDAs, and mobile phones.
Input capacitor C
IN
serves two important functions. First, it
blocks any DC voltage from the previous stage to prevent
the output from shifting to some unwanted DC level. This
could cause the output to saturate when audio signal is ap-
plied at the input. Second, the C
IN
and the 10k input resistor
form a low pass filter to block any low frequency noise. The
cut-off frequency of this low pass filter is given by,
where R
1
= 10kΩin LMV110. Output capacitor C
OUT
is used
to block the DC output from the next stage. R
bias
is selected
according to the microphone requirement.
DS101234-13
FIGURE 1. Resistive Isolation of a Heavy Capacitive
Load
DS101234-12
FIGURE 2. Pulse Response of LMV101 in
Figure 1
DS101234-10
FIGURE 3. Phase Inverting AC Amplifier
DS101234-11
FIGURE 4.
LMV101/102/105/110
www.national.com 8
Application Information (Continued)
To improve power supply ripple rejection of the above micro-
phone preamplifier, another capacitor and a pot can be con-
nected to pin 1 as shown in
Figure 6
. The impedance of the
two capacitors at audio frequencies are low. The R
POT
can
be adjusted so that the supply ripples injected through both
the inverting input and the non-inverting input cancel each
other at the output. If we ignore the impedance of the capaci-
tors, we can select the pot value based on the following
equation:
Z
OUT
is the output impedance of the microphone, and G is
the gain of the preamplifier in absolute value.
6.0 Adjustable-Gain Amplifier
The LMV101/102/105/110 not only provides fixed gain of −1,
−2, −5, and −10, it can also be configured for different gains
by adding only one external resistor.
You can decrease the gain by putting a resistor in series with
pin1(
Figure 7
). You can increase the gain by connecting a
resistor from pin 1 to pin 3 (
Figure 8
).
If you are using the LMV110 as a microphone preamplifier
for an electret microphone (
Figure 5
), and the output imped-
ance of the microphone is 1kΩ, then the gain of the pream-
plifier is
If we choose a small value for R, then we could get a pream-
plifier with a gain close to 100 (40dB), which is 10 times the
gain provided by LMV110.
DS101234-15
FIGURE 5. Microphone Preamplifier with 20dB Gain
DS101234-17
FIGURE 6. Improved Ripple Rejection
DS101234-18
FIGURE 7. Decreased Gain
DS101234-19
FIGURE 8. Increased Gain
LMV101/102/105/110
www.national.com9
Connection Diagrams
Ordering Information
Package Part number Marking DC Gain R1 R2 Transport Media NSC
Drawing
SC70-5
LMV101M7 A38 −1 100k 100k 1k Units Tape and Reel
MAA05A
LMV101M7X 3k Units Tape and Reel
LMV102M7 A39 −2 100k 200k 1k Units Tape and Reel
LMV102M7X 3k Units Tape and Reel
LMV105M7 A40 −5 50k 250k 1k Units Tape and Reel
LMV105M7X 3k Units Tape and Reel
LMV110M7 A41 −10 10k 100k 1k Units Tape and Reel
LMV110M7X 3k Units Tape and Reel
SOT23-5
LMV101M5 A33A −1 100k 100k 1k Units Tape and Reel
MA05B
LMV101M5X 3k Units Tape and Reel
LMV102M5 A34A −2 100k 200k 1k Units Tape and Reel
LMV102M5X 3k Units Tape and Reel
LMV105M5 A35A −5 50k 250k 1k Units Tape and Reel
LMV105M5X 3k Units Tape and Reel
LMV110M5 A36A −10 10k 100k 1k Units Tape and Reel
LMV110M5X 3k Units Tape and Reel
DS101234-2
DS101234-1
5-Pin SC70-5 (M7) DS101234-3
5-Pin SOT23-5 (M5)
LMV101/102/105/110
www.national.com 10
Physical Dimensions inches (millimeters) unless otherwise noted
5-Pin SC70-5 Tape and Reel
Order Numbers LMV101M7, LMV101M7X, LMV102M7, LMV102M7X,
LMV105M7, LMV105M7X, LMV110M7 or LMV110M7X
NS Package Number MAA05A
LMV101/102/105/110
www.national.com11
Physical Dimensions inches (millimeters) unless otherwise noted
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can be reasonably expected to cause the failure of
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5-Pin SOT23-5 Tape and Reel
Order Numbers LMV101M5, LMV101M5X, LMV102M5, LMV102M5X,
LMV105M5, LMV105M5X, LMV110M5 or LMV110M5X
NS Package Number MA05B
LMV101/102/105/110 Fixed-Gain Amplifiers
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.
