Datasheet LMV651, LMV652, LMV654 Datasheet (National Semiconductor)

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LMV651/LMV652/LMV654 12 MHz, Low Voltage, Low Power Amplifiers
LMV651/LMV652/LMV654 12 MHz, Low Voltage, Low Power Amplifiers
October 8, 2008

General Description

National’s LMV651/LMV652/LMV654 are high performance, low power operational amplifier ICs implemented with National's advanced VIP50 process. This family of parts fea­tures 12 MHz of bandwidth while consuming only 116 μA of current, which is an exceptional bandwidth to power ratio in this op amp class. The LMV651/LMV652/LMV654 are unity gain stable and provide an excellent solution for general pur­pose amplification in low voltage, low power applications.
This family of low voltage, low power amplifiers provides su­perior performance and economy in terms of power and space usage. These op amps have a maximum input offset voltage of 1.5 mV, a rail-to-rail output stage and an input com­mon-mode voltage range that includes ground. The LMV651/ LMV652/LMV654 provide a PSRR of 95 dB, a CMRR of 100 dB and a total harmonic distortion (THD) of 0.003% at 1 kHz frequency and 2 k load.
The operating supply voltage range for this family of parts is from 2.7V and 5.5V. These op amps can operate over a wide temperature range (−40°C to 125°C) making them ideal for automotive applications, sensor applications and portable equipment applications. The LMV651 is offered in the ultra tiny 5-Pin SC70 and 5-Pin SOT-23 package. The LMV652 is offered in an 8-Pin MSOP package. The LMV654 is offered in a 14-Pin TSSOP package.

Features

(Typical 5V supply, unless otherwise noted.)
Guaranteed 3.0V and 5.0V performance
Low power supply current
LMV651
LMV652
LMV654
High unity gain bandwidth 12 MHz
Max input offset voltage 1.5 mV
CMRR 100 dB
PSRR 95 dB
Input referred voltage noise 17 nV/Hz
Output swing with 2 k load 120 mV from rail
Total harmonic distortion 0.003% @ 1 kHz, 2 k
Temperature range −40°C to 125°C
118 μA per amplifier 122 μA per amplifier

Applications

Portable equipment
Automotive
Battery powered systems
Sensors and Instrumentation
116 μA
High Gain Wide Bandwidth Inverting Amplifier
© 2008 National Semiconductor Corporation 201238 www.national.com
20123861
Open Loop Gain and Phase vs. Frequency
20123806
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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 2000VMachine Model 100V
Differential Input V
Supply Voltage (VS = V+ - V−)
LMV651/LMV652/LMV654
Input/Output Pin Voltage V+ +0.3V, V− −0.3V
Storage Temperature Range −65°C to 150°C Junction Temperature (Note 3) 150°C Soldering Information
ID
±0.3V
6V
Infrared or Convection (20 sec) 235°CWave Soldering Lead Temp (10
sec) 260°C

Operating Ratings (Note 1)

Temperature Range (Note 3) −40°C to 125°C Supply Voltage 2.7V to 5.5V Package Thermal Resistance (θJA)(Note 3)
5-Pin SC70 456°C/W 5-Pin SOT-23 234°C/W 8-Pin MSOP 234°C/W 14-Pin TSSOP 160°C/W

3V DC Electrical Characteristics

Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 3V, V− = 0V, VO = VCM = V+/2, and RL > 1 MΩ. Bold- face limits apply at the temperature extremes.
Symbol Parameter Conditions Min
(Note 5)
V
OS
TC V
I
B
I
OS
CMRR Common Mode Rejection Ratio
PSRR Power Supply Rejection Ratio
CMVR Input Common-Mode Voltage
A
VOL
V
O
I
SC
I
S
SR Slew Rate AV = +1,
GBW Gain Bandwidth Product 12 MHz
Input Offset Voltage 0.1 ±1.5
Input Offset Average Drift 6.6
OS
Input Bias Current (Note 6) 80 120 nA
Input Offset Current 2.2 15
0 V
3.0 V+ 5V, VCM = 0.5
2.7 V+ 5.5V, VCM = 0.5
Range
Large Signal Voltage Gain
Output Swing High
Output Swing Low
Maximum Continuous Output Current
Supply Current per Amplifier LMV651 115 140
CMRR 75 dB
CMRR 60 dB
0.3 VO 2.7, RL = 2 k to V+/2
0.4 VO 2.6, RL = 2 k to V+/2
0.3 VO 2.7, RL = 10 k to V+/2
0.4 VO 2.6, RL = 10 k to V+/2
RL = 2 k to V+/2
RL = 10 k to V+/2
RL = 2 k to V+/2
RL = 10 k to V+/2
Sourcing (Note 8) 17
Sinking (Note 8) 25
LMV652 118
LMV654 122
10% to 90% (Note 7)
2.0 V
CM
87
80
87
81
87
81
0
0
80
76
86
83
80 95
45 50
95 110
60 65
3.0
Typ
(Note 4)
100 dB
95 dB
95
2.1
85
93
Max
(Note 5)
2.7
2.1
120
60
125
75
175
Units
mV
μV/°C
nA
V
dB
mV from
rail
mA
μA
V/μs
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LMV651/LMV652/LMV654
Symbol Parameter Conditions Min
(Note 5)
e
n
Input-Referred Voltage Noise f = 100 kHz 17
f = 1 kHz 17
i
n
Input-Referred Current Noise f = 100 kHz 0.1
f = 1 kHz 0.15
THD Total Harmonic Distortion
f = 1 kHz, AV = 2, RL = 2 k
0.003 %
Typ
(Note 4)
Max
(Note 5)
Units
nV/
pA/

5V DC Electrical Characteristics

Unless otherwise specified, all limits are guaranteed for TJ = 25°C, V+ = 5V, V− = 0V,VO = VCM = V+/2, and RL > 1 MΩ. Boldface limits apply at the temperature extremes.
Symbol Parameter Conditions Min
(Note 5)
V
OS
TC V
I
B
I
OS
CMRR Common Mode Rejection Ratio
PSRR Power Supply Rejection Ratio
Input Offset Voltage 0.1 ±1.5
Input Offset Average Drift 6.6
OS
Input Bias Current (Note 6) 80 120 nA
Input Offset Current 2.2 15
0 V
4.0 V
CM
3V V+ 5V, VCM = 0.5V
90
83
87
81
2.7V V+ 5.5V, VCM = 0.5V
87
81
CMVR Input Common-Mode Voltage
Range
A
VOL
V
O
Large Signal Voltage Gain
Output Swing High
Output Swing Low
I
SC
Maximum Continuous Output Current
I
S
Supply Current per Amplifier LMV651 116 140
CMRR 80 dB
CMRR 68 dB
0.3 VO 4.7V, RL = 2 k to V+/2
0.4 VO 4.6, RL = 2 k to V+/2
0.3 VO 4.7V, RL = 10 k to V+/2
0.4 VO 4.6, RL = 10 k to V+/2
RL = 2 k to V+/2
RL = 10 k to V+/2
RL = 2 k to V+/2
RL = 10 k to V+/2
Sourcing (Note 8) 18.5
Sinking (Note 8) 25
0
0
79
76
87
84
120 140
75 90
110 130
70 80
LMV652 118
LMV654 122
SR Slew Rate AV = +1, VO = 1 V
PP
3.0
10% to 90% (Note 7)
GBW Gain Bandwidth Product 12 MHz
e
n
Input-Referred Voltage Noise f = 100 kHz 17
f = 1 kHz 17
i
n
Input-Referred Current Noise f = 100 kHz 0.1
f = 1 kHz 0.15
THD Total Harmonic Distortion
f = 1 kHz, AV = 2, RL = 2 k
0.003 %
Typ
(Note 4)
Max
(Note 5)
2.7
100 dB
95 dB
95
4.1
4.1
84
94
185
120
150
95
175
nV/
pA/
Units
mV
μV/°C
nA
V
dB
mV from
rail
mA
μA
V/μs
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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, 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: 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 5: 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 6: Positive current corresponds to current flowing into the device.
LMV651/LMV652/LMV654
Note 7: Slew rate is the average of the rising and falling slew rates.
Note 8: The part is not short circuit protected and is not recommended for operation with low resistive loads. Typical sourcing and sinking output current curves
are provided in the Typical Performance Characteristics and should be consulted before designing for heavy loads.
- TA)/ θJA. All numbers apply for packages soldered directly onto a PC board.
J(MAX)
, θJA, and TA. The maximum allowable power dissipation at any ambient temperature is
J(MAX

Connection Diagrams

5-Pin SC70/ SOT-23
Top View
20123802
8-Pin MSOP
Top View
14-Pin TSSOP
20123803
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
LMV651MG
LMV651MGX 3k Units Tape and Reel
LMV651MF
LMV651MFX 3k Units Tape and Reel
LMV652MM
LMV652MMX 3.5k Units Tape and Reel
LMV654MT
LMV654MTX 2.5k Units Tape and Reel
A93
AY2A
AB3A
LMV654MT
1k Units Tape and Reel
1k Units Tape and Reel
1k Units Tape and Reel
94 Units/Rail
MAA05A
MF05A
MUA08A
MTC14
20123804
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LMV651/LMV652/LMV654

Typical Performance Characteristics Unless otherwise specified, T

VCM= VS/2
Supply Current vs. Supply Voltage (LMV651)
20123834
Supply Current per Channel vs. Supply Voltage (LMV654)
Supply Current per Channel vs. Supply Voltage (LMV652)
VOS vs. V
= 25°C, VS= 5V, V+= 5V, V−= 0V,
A
20123865
CM
VOS vs. V
CM
20123864
20123826
20123825
VOS vs. Supply Voltage
20123821
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I
BIAS
LMV651/LMV652/LMV654
vs. V
CM
I
BIAS
vs. V
CM
20123823
I
vs. Supply Voltage
BIAS
20123822
Negative Output Swing vs. Supply Voltage
20123824
Positive Output Swing vs. Supply Voltage
20123828
Positive Output Swing vs. Supply Voltage
20123829
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20123827
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LMV651/LMV652/LMV654
Negative Output Swing vs. Supply Voltage
20123830
Sinking Current vs. Output Voltage (LMV651)
Sourcing Current vs. Output Voltage
20123832
Sinking Current vs. Output Voltage (LMV652)
20123833
Sinking Current vs. Output Voltage (LMV654)
20123863
20123866
Open Loop Gain and Phase with Capacitive Load
20123811
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Open Loop Gain and Phase with Resistive Load
LMV651/LMV652/LMV654
Phase Margin vs. Capacitive Load (Stability)
20123812
Input Referred Voltage Noise vs. Frequency
20123814
Slew Rate vs. Supply Voltage
20123813
Input Referred Current Noise vs. Frequency
20123815
THD+N vs. V
OUT
20123816
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20123809
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LMV651/LMV652/LMV654
THD+N vs. V
OUT
THD+N vs. Frequency
20123810
THD+N vs. Frequency
20123807
Small Signal Transient Response
Small Signal Transient Response
20123808
20123817
20123818
Large Signal Transient Response
20123819
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PSRR vs. Frequency
LMV651/LMV652/LMV654
CMRR vs. Frequency
20123835
Closed Loop Output Impedance vs. Frequency
20123837
20123836
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Application Information

ADVANTAGES OF THE LMV651/LMV652/LMV654

Low Voltage and Low Power Operation

The LMV651/LMV652/LMV654 have performance guaran­teed at supply voltages of 3V and 5V. These parts are guar­anteed to be operational at all supply voltages between 2.7V and 5.5V. The LMV651 draws a low supply current of 116 μA, the LMV652 draws 118 μA/channel and the LMV654 draws 122 μA/channel. This family of op amps provides the low voltage and low power amplification which is essential for portable applications.

Wide Bandwidth

Despite drawing the very low supply current of 116 µA, the LMV651/LMV652/LMV654 manage to provide a wide unity gain bandwidth of 12 MHz. This is easily one of the best bandwidth to power ratios ever achieved, and allows these op amps to provide wideband amplification while using the min­imum amount of power. This makes this family of parts ideal for low power signal processing applications such as portable media players and other accessories.

Low Input Referred Noise

The LMV651/LMV652/LMV654 provide a flatband input re­ferred voltage noise density of 17 nV/ cantly better than the noise performance expected from a low power op amp. These op amps also feature exceptionally low 1/f noise, with a very low 1/f noise corner frequency of 4 Hz. This makes these parts ideal for low power applications which require decent noise performance, such as PDAs and portable sensors.

Ground Sensing and Rail-to-Rail Output

The LMV651/LMV652/LMV654 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 of this family of devices includes the negative supply rail which al­lows direct sensing at ground in a single supply operation.

Small Size

The small footprint of the packages for the LMV651/LMV652/ LMH654 saves space on printed circuit boards, and enables 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, these op amps can be placed closer to the signal source, reducing noise pickup and enhancing signal integrity.
, which is signifi-
LMV651/LMV652/LMV654
20123859
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.
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 bypass CL at higher frequencies.

STABILITY OF OP AMP CIRCUITS

Stability and Capacitive Loading

If the phase margin of the LMV651/LMV652/LMV654 is plot­ted with respect to the capacitive load (CL) at its output, it is seen that the phase margin reduces significantly if CL is in­creased beyond 100 pF. This is because the op amp is designed to provide the maximum bandwidth possible for a low supply current. Stabilizing it 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 these devices are to be used for driving higher capacitive loads, they would have to be externally compensated.
20123858
FIGURE 2. In the Loop Compensation
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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 and R are taken to be 10 k, RL is 2 k, while R 340Ω.
OUT
LMV651/LMV652/LMV654
TABLE 1.
CL (pF)
RS (Ω)
150 340 15 39.4
200 340 20 34.6
250 340 25 31.1
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.
CF (pF) Phase Margin (°)
is taken as
(1)
than 0.003% distortion. Two amplifier circuits are shown in Figure 4 and Figure 5. Figure 4 is an inverting amplifier, with a 100 k feedback resistor, R2, and a 1 k input resistor, R1, and provides a gain of −100. With the LMV651/LMV652/ LMV654 these circuits can provide gain of −100 with a −3 dB bandwidth of 120 kHz, for a quiescent current as low as 116 μA. Similarly, the circuit in Figure 5, a non-inverting amplifier with a gain of 1001, can provide that gain with a −3 dB band-
IN
width of 12 kHz, for a similar low quiescent power dissipation. Coupling capacitors CC1 and CC2 can be added to isolate the circuit from DC voltages, while RB1 and RB2 provide DC bias­ing. A feedback capacitor CF can also be added to improve compensation.

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 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 5 to 50 are usually sufficient to ensure stability. A larger value of R with lesser ringing and overshoot, but will also limit the output
will result in a system
ISO
swing and the short circuit current of the circuit.
20123860
FIGURE 3. Compensation by Isolation Resistor

Typical Applications

HIGH GAIN LOW POWER AMPLIFIERS

With a low supply current, low power operation, and low har­monic distortion, the LMV651/LMV652/LMV654 are ideal for wide-bandwidth, high gain amplification. The wide unity gain bandwidth allows these parts to provide large gain over a wide frequency range, while driving loads as low as 2 k with less
20123861

FIGURE 4. High Gain Inverting Amplifier

20123862

FIGURE 5. High Gain Non-Inverting Amplifier

ACTIVE FILTERS

With a wide unity gain bandwidth of 12 MHz, low input referred noise density and a low power supply current, the LMV651/ LMV652/LMV654 are well suited for low-power filtering appli­cations. Active filter topologies, like the Sallen-Key low pass filter shown in Figure 6, 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.
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In the circuit shown in Figure 6, 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. The ratio of the two resistors, m2, provides a knob to control the value of Q obtained.
20123820

FIGURE 6. Sallen-Key Low Pass Filter

LMV651/LMV652/LMV654
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Physical Dimensions inches (millimeters) unless otherwise noted

LMV651/LMV652/LMV654
NS Package Number MAA05A
5-Pin SC70
5-Pin SOT-23
NS Package Number MF05A
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LMV651/LMV652/LMV654
NS Package Number MUA08A
8-Pin MSOP
14-Pin TSSOP
NS Package Number MTC14
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Notes
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LMV651/LMV652/LMV654 12 MHz, Low Voltage, Low Power Amplifiers
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