LMV551/LMV552/LMV554
3 MHz, Micropower RRO Amplifiers
LMV551/LMV552/LMV554 3 MHz, Micropower RRO Amplifiers
October 8, 2008
General Description
The LMV551/LMV552/LMV554 are high performance, low
power operational amplifiers implemented with National’s advanced VIP50 process. They feature 3 MHz of bandwidth
while consuming only 37 μA of current per amplifier, which is
an exceptional bandwidth to power ratio in this op amp class.
These amplifiers are unity gain stable and provide an excellent solution for low power applications requiring a wide bandwidth.
The LMV551/LMV552/LMV554 have a rail-to-rail output stage
and an input common mode range that extends below ground.
The LMV551/LMV552/LMV554 have an operating supply
voltage range from 2.7V to 5.5V. These amplifiers can operate over a wide temperature range (−40°C to 125°C) making
them a great choice for automotive applications, sensor applications as well as portable instrumentation applications.
The LMV551 is offered in the ultra tiny 5-Pin SC70 and 5-Pin
SOT-23 package. The LMV552 is offered in an 8-Pin MSOP
package. The LMV554 is offered in the 14-Pin TSSOP.
Typical Application
Features
(Typical 5V supply, unless otherwise noted.)
Guaranteed 3V and 5.0V performance
■
High unity gain bandwidth 3 MHz
■
Supply current (per amplifier) 37 µA
■
CMRR 93 dB
■
PSRR 90 dB
■
Slew rate 1 V/µs
■
Output swing with 100 kΩ load 70 mV from rail
■
Total harmonic distortion 0.003% @ 1 kHz, 2 kΩ
■
Temperature range −40°C to 125°C
■
Applications
Active filter
■
Portable equipment
■
Automotive
■
Battery powered systems
■
Sensors and Instrumentation
■
20152601
Open Loop Gain and Phase vs. Frequency
© 2008 National Semiconductor Corporation 201526 www.national.com
20152613
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
LMV551/LMV552/LMV554 2 KV
Machine Model
LMV551 100V
LMV551/LMV552/LMV554
LMV552/LMV554 250V
V
Differential (@ V+ = 5V)
IN
Supply Voltage (V+ - V−)
Voltage at Input/Output pins V+ +0.3V, V− −0.3V
±2.5V
6V
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+ – V−)
Package Thermal Resistance (θJA (Note 3))
5-Pin SC70 456°C/W
5-Pin SOT-23 234°C/W
8-Pin MSOP 235°C/W
14-Pin TSSOP 160°C/W
Storage Temperature Range −65°C to 150°C
3V Electrical Characteristics
Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 3V, V− = 0V, VCM = V+/2 = VO. Boldface limits apply at
the temperature extremes. (Note 4)
Symbol Parameter Conditions Min
(Note 6)
V
OS
TC V
I
B
I
OS
CMRR Common Mode Rejection Ratio
PSRR Power Supply Rejection Ratio
Input Offset Voltage 1 3
Input Offset Average Drift 3.3
OS
Input Bias Current (Note 7) 20 38 nA
Input Offset Current 1 20 nA
0V ≤ VCM 2.0V
3.0 ≤ V+ ≤ 5V,
LMV551/LMV552 80
VCM = 0.5V
LMV554 78
2.7 ≤ V+ ≤ 5.5V,
LMV551/LMV552 80
VCM = 0.5V
LMV554 78
CMVR Input Common-Mode Voltage
Range
A
VOL
Large Signal Voltage Gain
CMRR ≥ 68 dB
CMRR ≥ 60 dB
0.4 ≤ VO ≤ 2.6,
LMV551/LMV552 81
RL = 100 kΩ to V+/2
LMV554 79
0.4 ≤ VO ≤ 2.6, RL = 10 kΩ to V+/2
V
O
Output Swing High
RL = 100 kΩ to V+/2
RL = 10 kΩ to V+/2
Output Swing Low
RL = 100 kΩ to V+/2
RL = 10 kΩ to V+/2
I
SC
Output Short Circuit Current Sourcing (Note 9) 10
Sinking (Note 9) 25
74
72
78
76
78
76
0
0
78
77
71
68
40 48
85 100
50 65
95 110
Typ
(Note 5)
92
92
92
2.1
90
80
Max
(Note 6)
4.5
2.1
58
120
77
130
2.7V to 5.5V
mV from
Units
mV
μV/°C
dB
dB
V
dB
rail
mA
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LMV551/LMV552/LMV554
Symbol Parameter Conditions Min
(Note 6)
I
S
Supply Current per Amplifier 34 42
SR Slew Rate AV = +1,
1
Typ
(Note 5)
Max
(Note 6)
52
Units
μA
V/μs
10% to 90% (Note 8)
Φm
Phase Margin
RL = 10 kΩ, CL = 20 pF
75 Deg
GBW Gain Bandwidth Product 3 MHz
e
n
i
n
THD Total Harmonic Distortion
Input-Referred Voltage Noise f = 100 kHz 70
f = 1 kHz 70
Input-Referred Current Noise f = 100 kHz 0.1
f = 1 kHz 0.15
f = 1 kHz, AV = 2, RL = 2 kΩ
0.003 %
nV/
pA/
5V Electrical Characteristics
Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 5V, V− = 0V, VCM = V+/2 = VO. Boldface limits apply at
the temperature extremes.
Symbol Parameter Conditions Min
(Note 6)
V
OS
TC V
I
B
I
OS
CMRR Common Mode Rejection Ratio
PSRR Power Supply Rejection Ratio
Input Offset Voltage 1 3.0
Input Offset Average Drift 3.3
OS
Input Bias Current (Note 7) 20 38 nA
Input Offset Current 1 20 nA
0 ≤ V
CM
≤ 4.0V
3V ≤ V+ ≤ 5V to VCM = 0.5V
76
74
78
75
2.7V ≤ V+ ≤ 5.5V to VCM = 0.5V
78
75
CMVR Input Common-Mode Voltage
Range
A
VOL
Large Signal Voltage Gain
CMRR ≥ 68 dB
CMRR ≥ 60 dB
0.4 ≤ VO ≤ 4.6, RL = 100 kΩ to V+/2
0
0
78
75
0.4 ≤ VO ≤ 4.6, RL = 10 kΩ to V+/2
75
72
V
O
I
SC
Output Swing High
Output Swing Low
RL = 100 kΩ to V+/2
RL = 10 kΩ to V+/2
RL = 100 kΩ to V+/2
RL = 10 kΩ to V+/2
70 92
125 155
60 70
110 130
Output Short Circuit Current Sourcing (Note 9) 10
Sinking (Note 9) 25
I
S
SR Slew Rate AV = +1, VO = 1 V
Supply Current Per Amplifier 37 46
PP
1
10% to 90% (Note 8)
Φm
Phase Margin
RL = 10 kΩ, CL = 20 pF
75 Deg
GBW Gain Bandwidth Product 3 MHz
Typ
(Note 5)
93
90
90
4.1
90
80
Max
(Note 6)
4.5
4.1
122
210
82
155
54
Units
mV
μV/°C
dB
dB
V
dB
mV from
rail
mA
μA
V/μs
3 www.national.com
Symbol Parameter Conditions Min
(Note 6)
e
n
Input-Referred Voltage Noise f = 100 kHz 70
Typ
(Note 5)
Max
(Note 6)
f = 1 kHz 70
i
n
Input-Referred Current Noise f = 100 kHz 0.1
f = 1 kHz 0.15
THD Total Harmonic Distortion
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
LMV551/LMV552/LMV554
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, applicable std. MIL-STD-883, Method 3015.7. Machine Model, applicable std. JESD22-A115-A (ESD MM std. of JEDEC)
Field-Induced Charge-Device Model, applicable std. JESD22-C101-C (ESD FICDM std. of JEDEC).
Note 3: The maximum power dissipation is a function of T
PD = (T
Note 4: 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 = TA. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where TJ >
TA.
Note 5: Typical values represent the most likely parametric norm as determined at the time of characterization. Actual typical values may vary over time and will
also depend on the application and configuration. The typical values are not tested and are not guaranteed on shipped production material.
Note 6: Limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlations using statistical quality
control (SQC) method.
Note 7: Positive current corresponds to current flowing into the device.
Note 8: Slew rate is the average of the rising and falling slew rates.
Note 9: The part is not short circuit protected and is not recommended for operation with heavy resistive loads.
- TA)/ θJA. All numbers apply for packages soldered directly onto a PC board.
J(MAX)
f = 1 kHz, AV = 2, RL = 2 kΩ
, θJA. The maximum allowable power dissipation at any ambient temperature is
J(MAX)
0.003 %
Connection Diagrams
Units
nV/
pA/
5-Pin SC70/ SOT-23
Top View
20152602
8-Pin MSOP
Top View
14-Pin TSSOP
20152611
Top View
Ordering Information
Package Part Number Package Marking Transport Media NSC Drawing
5-Pin SC70
5-Pin SOT-23
8-Pin MSOP
14-Pin TSSOP
LMV551MG
LMV551MGX 3k Units Tape and Reel
LMV551MF
LMV551MFX 3k Units Tape and Reel
LMV552MM
LMV552MMX 3.5k Units Tape and Reel
LMV554MT
LMV554MTX 2.5k Units Tape and Reel
A94
AF3A
AH3A
LMV554MT
1k Units Tape and Reel
1k Units Tape and Reel
1k Units Tape and Reel
94 Units/Rail
20152610
MAA05A
MF05A
MUA08A
MTC14
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Typical Performance Characteristics
LMV551/LMV552/LMV554
Open Loop Gain and Phase with Capacitive Load
20152614
Open Loop Gain and Phase with Resistive Load
Open Loop Gain and Phase with Resistive Load
20152615
Open Loop Gain and Phase with Resistive Load
20152616
Open Loop Gain and Phase with Resistive Load
20152618
20152617
Slew Rate vs. Supply voltage
20152619
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Small Signal Transient Response
LMV551/LMV552/LMV554
Large Signal Transient Response
Small Signal Transient Response
THD+N vs. Amplitude @ 3V
20152620
20152622
20152621
Input Referred Noise vs. Frequency
20152623
THD+N vs. Amplitude @ 5V
20152624
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20152625
LMV551/LMV552/LMV554
THD+N vs. Amplitude
Supply Current vs. Supply Voltage
20152626
THD+N vs. Amplitude
VOS vs. V
CM
20152627
VOS vs. V
CM
20152628
20152630
20152629
VOS vs. Supply Voltage
20152631
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I
BIAS
LMV551/LMV552/LMV554
vs. V
CM
I
BIAS
vs. V
CM
20152632
I
vs. Supply Voltage
BIAS
20152634
Negative Output Swing vs. Supply Voltage
20152633
Positive Output Swing vs. Supply Voltage
20152635
Positive Output Swing vs. Supply Voltage
20152636
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20152637
Negative Output Swing vs. Supply Voltage
20152638
LMV551/LMV552/LMV554
Applications Information
ADVANTAGES OF THE LMV551/LMV552/LMV554
Low Voltage and Low Power Operation
The LMV551/LMV552/LMV554 have performance guaranteed at supply voltages of 3V and 5V and are guaranteed to
be operational at all supply voltages between 2.7V and 5.5V.
For this supply voltage range, the LMV551/LMV552/LMV554
draw the extremely low supply current of less than 37 μA per
amp.
Wide Bandwidth
The bandwidth to power ratio of 3 MHz to 37 μA per amplifier
is one of the best bandwidth to power ratios ever achieved.
This makes these devices ideal for low power signal processing applications such as portable media players and instrumentation.
Low Input Referred Noise
The LMV551/LMV552/LMV554 provide a flatband input referred voltage noise density of 70 nV/
cantly better than the noise performance expected from an
ultra low power op amp. They also feature the exceptionally
low 1/f noise corner frequency of 4 Hz. This noise specification makes the LMV551/LMV552/LMV554 ideal for low power
applications such as PDAs and portable sensors.
Ground Sensing and Rail-to-Rail Output
The LMV551/LMV552/LMV554 each have a rail-to-rail output
stage, which provides the maximum possible output dynamic
range. This is especially important for applications requiring
a large output swing. The input common mode range includes
the negative supply rail which allows direct sensing at ground
in a single supply operation.
Small Size
The small footprints of the LMV551/LMV552/LMV554 packages save space on printed circuit boards, and enable the
design of smaller and more compact electronic products.
Long traces between the signal source and the op amp make
the signal path susceptible to noise. By using a physically
smaller package, the amplifiers can be placed closer to the
signal source, reducing noise pickup and enhancing signal
integrity
, which is signifi-
STABILITY OF OP AMP CIRCUITS
Stability and Capacitive Loading
As seen in the Phase Margin vs. Capacitive Load graph, the
phase margin reduces significantly for CL greater than 100
pF. This is because the op amp is designed to provide the
maximum bandwidth possible for a low supply current. Stabilizing them for higher capacitive loads would have required
either a drastic increase in supply current, or a large internal
compensation capacitance, which would have reduced the
bandwidth of the op amp. Hence, if the LMV551/LMV552/
LMV554 are to be used for driving higher capacitive loads,
they will have to be externally compensated.
20152603
FIGURE 1. Gain vs. Frequency for an Op Amp
An op amp, ideally, has a dominant pole close to DC, which
causes its gain to decay at the rate of 20 dB/decade with respect to frequency. If this rate of decay, also known as the
rate of closure (ROC), remains the same until the op amp’s
unity gain bandwidth, the op amp is stable. If, however, a large
capacitance is added to the output of the op amp, it combines
with the output impedance of the op amp to create another
pole in its frequency response before its unity gain frequency
(Figure 1). This increases the ROC to 40 dB/ decade and
causes instability.
9 www.national.com
In such a case a number of techniques can be used to restore
stability to the circuit. The idea behind all these schemes is to
modify the frequency response such that it can be restored to
an ROC of 20 dB/decade, which ensures stability.
In the Loop Compensation
Figure 2 illustrates a compensation technique, known as ‘in
the loop’ compensation, that employs an RC feedback circuit
within the feedback loop to stabilize a non-inverting amplifier
configuration. A small series resistance, RS, is used to isolate
the amplifier output from the load capacitance, CL, and a small
capacitance, CF, is inserted across the feedback resistor to
LMV551/LMV552/LMV554
bypass CL at higher frequencies.
FIGURE 2. In the Loop Compensation
The values for RS and CF are decided by ensuring that the
zero attributed to CF lies at the same frequency as the pole
attributed to CL. This ensures that the effect of the second
pole on the transfer function is compensated for by the presence of the zero, and that the ROC is maintained at 20 dB/
decade. For the circuit shown in Figure 2 the values of RS and
CF are given by Equation 1. Values of RS and CF required for
maintaining stability for different values of CL, as well as the
phase margins obtained, are shown in Table 1. RF, RIN, and
RL are to be 10 kΩ, while R
is 340Ω.
OUT
20152604
is shown in Figure 3. A resistor, R
tween the load capacitance and the output. This introduces a
, is placed in series be-
ISO
zero in the circuit transfer function, which counteracts the effect of the pole formed by the load capacitance and ensures
stability. The value of R
pending on the size of CL and the level of performance de-
to be used should be decided de-
ISO
sired. Values ranging from 5Ω to 50Ω are usually sufficient to
ensure stability. A larger value of R
with less ringing and overshoot, but will also limit the output
will result in a system
ISO
swing and the short circuit current of the circuit.
20152612
FIGURE 3. Compensation by Isolation Resistor
Typical Application
ACTIVE FILTERS
With a wide unity gain bandwidth of 3 MHz, low input referred
noise density and a low power supply current, the LMV551/
LMV552/LMV554 are well suited for low-power filtering applications. Active filter topologies, such as the Sallen-Key low
pass filter shown in Figure 4, are very versatile, and can be
used to design a wide variety of filters (Chebyshev, Butterworth or Bessel). The Sallen-Key topology, in particular, can
be used to attain a wide range of Q, by using positive feedback to reject the undesired frequency range.
In the circuit shown in Figure 4, the two capacitors appear as
open circuits at lower frequencies and the signal is simply
buffered to the output. At high frequencies the capacitors appear as short circuits and the signal is shunted to ground by
one of the capacitors before it can be amplified. Near the cutoff frequency, where the impedance of the capacitances is on
the same order as RG and RF, positive feedback through the
other capacitor allows the circuit to attain the desired Q.
(1)
TABLE 1.
CL (pF)
RS (Ω)
CF (pF) Phase Margin
(°)
50 340 8 47
100 340 15 42
150 340 22 40
Although this methodology provides circuit stability for any
load capacitance, it does so at the price of bandwidth. The
closed loop bandwidth of the circuit is now limited by RF and
CF.
Compensation by External Resistor
In some applications it is essential to drive a capacitive load
without sacrificing bandwidth. In such a case, in the loop compensation is not viable. A simpler scheme for compensation
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20152609
FIGURE 4. Sallen-Key Filter
Physical Dimensions inches (millimeters) unless otherwise noted
LMV551/LMV552/LMV554
NS Package Number MAA05A
5-Pin SC70
5-Pin SOT-23
NS Package Number MF05A
11 www.national.com
LMV551/LMV552/LMV554
NS Package Number MUA08A
8-Pin MSOP
14-Pin TSSOP
NS Package Number MTC14
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Notes
LMV551/LMV552/LMV554
13 www.national.com
Notes
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LMV551/LMV552/LMV554 3 MHz, Micropower RRO Amplifiers
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