NSC LMV101M7 Fixed-gain amplifier Datasheet

LMV101/102/105/110
Fixed-Gain Amplifiers
General Description
Features
The LMV101/102/105/110 fixed-gain amplifier family 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. 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 component count. It is the most cost effective solution for applications where low voltage operation, low power consumption,
space savings, and reliable performance are needed. It enables the design of small portable electronic devices, and allows the designer to place the device closer to the signal
source to reduce noise pickup and increase signal integrity.
(For 5V Supply, Typical Unless Otherwise Noted)
n Fixed inverting gain available
−1,−2,−5,−10
n DC gain accuracy @2.7V supply
— LMV101/102/105
2% (typ)
— LMV110
6% (typ)
n Space saving packages
SC70-5 & SOT23-5
n Industrial temperature range
−40˚C to +85˚C
n Low supply current
130µA
n Rail-to-Rail output swing
n Guaranteed 2.7V and 5V performance
Applications
n
n
n
n
n
General purpose portable devices
Mobile communications
Battery powered electronics
Active filters
Microphone preamplifiers
Typical Application
Phase Inverting AC Amplifier
DS101234-10
VOUT = 0.5VCC −VIN (R2/R1)
© 2000 National Semiconductor Corporation
DS101234
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LMV101/102/105/110 Fixed-Gain Amplifiers
August 2000
LMV101/102/105/110
Absolute Maximum Ratings (Note 1)
Storage Temperature Range
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Junction Temperature (TJ , max)
(Note 5)
Machine Model
200V
Human Body Model
+
150˚C
Operating Ratings (Note 1)
ESD Tolerance (Note 2)
Supply Voltage (V
-65˚C to 150˚C
Supply Voltage
1500V
- V −)
2.7V to 5.0V
−40˚C ≤ TJ ≤ 85˚C
Temperature Range
5.5V
Thermal resistance (θJA)
Output Short Circuit to V
+
(Note 3)
5-pin SC70-5
478˚C/W
Output Short Circuit to V
−
(Note 4)
5-pin SOT23-5
265˚C/W
Mounting Temperature
Infrared or Convection (20 sec)
235˚C
2.7V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.7V, V− = 0V, VO = V +/2 and RL > 1MΩ. Boldface limits apply at the temperature extremes.
Symbol
VO
IS
Parameter
Output Swing
RL = 10kΩ to 1.35V
Supply Current
DC Gain Accuracy
GBW
Conditions
−3dB Bandwidth
LMV101, Gain = −1
Typ
(Note 6)
Max
(Note 7)
Units
V+−0.01
V+−0.1
V
min
0.08
0.18
V
max
80
170
µA
max
2
5
%
%
LMV102, Gain = −2
2
5
LMV105, Gain = −5
2
6
%
LMV110, Gain = −10
6
12
%
LMV101, Gain = −1,
R L = 2kΩ, CL = 100pF
1.6
MHz
LMV102, Gain = −2,
R L = 2kΩ, CL = 100pF
1.8
MHz
LMV105, Gain = −5,
R L = 2kΩ, CL = 100pF
0.8
MHz
LMV110, Gain = −10,
R L = 2kΩ, CL = 100pF
0.2
MHz
5V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VO = V +/2 and RL > 1MΩ. Boldface limits
apply at the temperature extremes.
Symbol
VO
Parameter
Output Swing
Conditions
Typ
(Note 6)
Max
(Note 7)
Units
V+−0.04
V+−0.3
V+−0.4
V
min
0.14
0.3
0.4
V
max
V+−0.01
V+−0.1
V+−0.2
V
min
0.1
0.18
0.28
V
max
Sourcing, VO = 0V
60
5
mA
min
Sinking, VO = 5V
160
10
mA
min
RL = 2kΩ to 2.5V
RL = 10kΩ to 2.5V
IO
Output Current
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2
(Continued)
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VO = V +/2 and RL > 1MΩ. Boldface limits
apply at the temperature extremes.
Symbol
Parameter
Conditions
Supply Current
IS
DC Gain Accuracy
Typ
(Note 6)
Max
(Note 7)
Units
130
250
350
µA
max
%
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, CL = 100pF
1.6
MHz
LMV102, Gain = −2,
R L = 2kΩ, CL = 100pF
1.8
MHz
LMV105, Gain = −5,
R L = 2kΩ, CL = 100pF
0.8
MHz
LMV110, Gain = −10,
R L = 2kΩ, CL = 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 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, 1.5kΩ in series with 100pF. Machine model, 0Ω in 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
P D = (TJ(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, VS = +5V, single supply, TA =
25˚C.)
Supply Current vs.
Supply Voltage
Sourcing Current
vs. Output Voltage
DS101234-22
DS101234-23
3
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LMV101/102/105/110
5V Electrical Characteristics
LMV101/102/105/110
Typical Performance Characteristics
(Unless otherwise specified, VS = +5V, single supply, TA =
25˚C.) (Continued)
Sourcing Current vs.
Output Voltage
Sinking Current vs.
Output Voltage
DS101234-24
Sinking Current vs.
Output Voltage
DS101234-25
Output Voltage Swing vs.
Supply Voltage
DS101234-26
LMV101 Close Loop
Frequency Response
DS101234-21
LMV101 Close Loop
Frequency Response
DS101234-27
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DS101234-28
4
(Unless otherwise specified, VS = +5V, single supply, TA =
25˚C.) (Continued)
LMV102 Close Loop
Frequency Response
LMV102 Close Loop
Frequency Response
DS101234-29
LMV105 Close Loop
Frequency Response
DS101234-30
LMV105 Close Loop
Frequency Response
DS101234-31
LMV110 Close Loop
Frequency Response
DS101234-32
LMV110 Close Loop
Frequency Response
DS101234-33
DS101234-34
5
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LMV101/102/105/110
Typical Performance Characteristics
LMV101/102/105/110
Typical Performance Characteristics
(Unless otherwise specified, VS = +5V, single supply, TA =
25˚C.) (Continued)
Inverting Large Signal Pulse Response
LMV101
Inverting Large Signal Pulse Response
LMV102
DS101234-35
Inverting Large Signal Pulse Response
LMV105
DS101234-37
Inverting Large Signal Pulse Response
LMV110
DS101234-39
Inverting Small Signal Pulse Response
LMV101
DS101234-41
Inverting Small Signal Pulse Response
LMV102
DS101234-36
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DS101234-38
6
(Unless otherwise specified, VS = +5V, single supply, TA =
25˚C.) (Continued)
Inverting Small Signal Pulse Response
LMV105
Inverting Small Signal Pulse Response
LMV110
DS101234-40
DS101234-42
Slew Rate vs.
Supply Voltage
DS101234-43
Application Information
low frequency variations and a smaller 0.1µF disc is paralleled 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 supply will turn on the diode and cause signal distortions. For
applications that require sensing voltages beyond the negative rail, use the LMV111 with external gain setting resistors.
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 enables 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 circuit 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 capacitors for simplification. When the circuits are built, it is always required to have bypass capacitors. Ceramic disc capacitors (0.1µF) or solid tantalum (1µF) with short leads, and
located close to the IC are usually necessary to prevent interstage coupling through the power supply internal impedance. Inadequate bypassing will manifest itself by a low frequency oscillation or by high frequency instabilities.
Sometimes, a 10µF (or larger) capacitor is used to absorb
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LMV101/102/105/110
Typical Performance Characteristics
LMV101/102/105/110
Application Information
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 VCC(R 1/R2).
(Continued)
3.0 Capacitive Load Tolerance
The LMV101/102/105/110 can directly drive 200pF capacitive load with Vs = 5V at −1 gain configuration without oscillation. Direct capacitive loading reduces the phase margin of
amplifiers. The combination of the amplifier’s output impedance 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.
DS101234-10
FIGURE 3. Phase Inverting AC Amplifier
It is recommended that a small-valued capacitor be used
across the feedback resistor (R2) to eliminate stability problems, prevent peaking of the response, and limit the bandwidth of the circuit. This can also help to reduce high frequency noise and some other interference. (See Figure 4)
DS101234-13
FIGURE 1. Resistive Isolation of a Heavy Capacitive
Load
The isolation resistor Riso and the CL form a pole to increase
stability by adding more phase margin to the overall system.
The desired performance depends on the value of Riso. The
bigger the Riso resistor value, the more stable VOUT will be.
Figure 2 is an output waveform of Figure 1 using 100Ω for
Riso and 1000pF for CL.
DS101234-11
FIGURE 4.
DS101234-12
FIGURE 2. Pulse Response of LMV101 in Figure 1
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, and AC input signal is
amplified by (R2/R1). Capacitor CIN acts as an input AC coupling capacitor to block DC potentials. A capacitor of 0.1µF or
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5.0 Microphone preamplifier
Most microphones have a low output voltage level. This output 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 CIN 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 applied at the input. Second, the CIN 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 R1 = 10kΩ in LMV110. Output capacitor COUT is used
to block the DC output from the next stage. R bias is selected
according to the microphone requirement.
8
6.0 Adjustable-Gain Amplifier
(Continued)
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
pin 1 (Figure 7). You can increase the gain by connecting a
resistor from pin 1 to pin 3 (Figure 8).
DS101234-15
FIGURE 5. Microphone Preamplifier with 20dB Gain
To improve power supply ripple rejection of the above microphone preamplifier, another capacitor and a pot can be connected to pin 1 as shown in Figure 6. The impedance of the
two capacitors at audio frequencies are low. The RPOT 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 capacitors, we can select the pot value based on the following
equation:
DS101234-18
FIGURE 7. Decreased Gain
ZOUT is the output impedance of the microphone, and G is
the gain of the preamplifier in absolute value.
DS101234-19
FIGURE 8. Increased Gain
If you are using the LMV110 as a microphone preamplifier
for an electret microphone (Figure 5), and the output impedance of the microphone is 1kΩ, then the gain of the preamplifier is
DS101234-17
FIGURE 6. Improved Ripple Rejection
If we choose a small value for R, then we could get a preamplifier with a gain close to 100 (40dB), which is 10 times the
gain provided by LMV110.
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LMV101/102/105/110
Application Information
LMV101/102/105/110
Connection Diagrams
DS101234-2
DS101234-1
5-Pin SC70-5 (M7)
DS101234-3
5-Pin SOT23-5 (M5)
Ordering Information
Package
Part number
LMV101M7
LMV101M7X
LMV102M7
SC70-5
LMV102M7X
LMV105M7
LMV105M7X
LMV110M7
LMV110M7X
LMV101M5
LMV101M5X
LMV102M5
SOT23-5
LMV102M5X
LMV105M5
LMV105M5X
LMV110M5
LMV110M5X
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Marking
DC Gain
R1
R2
A38
−1
100k
100k
A39
−2
100k
200k
A40
−5
50k
250k
A41
−10
10k
100k
A33A
−1
100k
100k
A34A
A35A
A36A
−2
−5
−10
100k
50k
10k
10
200k
250k
100k
Transport Media
NSC
Drawing
1k Units Tape and Reel
3k Units Tape and Reel
1k Units Tape and Reel
3k Units Tape and Reel
1k Units Tape and Reel
MAA05A
3k Units Tape and Reel
1k Units Tape and Reel
3k Units Tape and Reel
1k Units Tape and Reel
3k Units Tape and Reel
1k Units Tape and Reel
3k Units Tape and Reel
1k Units Tape and Reel
3k Units Tape and Reel
1k Units Tape and Reel
3k Units Tape and Reel
MA05B
LMV101/102/105/110
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
11
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LMV101/102/105/110 Fixed-Gain Amplifiers
Physical Dimensions
inches (millimeters) unless otherwise noted
5-Pin SOT23-5 Tape and Reel
Order Numbers LMV101M5, LMV101M5X, LMV102M5, LMV102M5X,
LMV105M5, LMV105M5X, LMV110M5 or LMV110M5X
NS Package Number MA05B
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