National Semiconductor LMV771 General Description Manual

Single/dual/quad, low offset, low noise, rro

Advertisement

Quick Links

LMV771/LMV772/LMV774
Single/Dual/Quad, Low Offset, Low Noise, RRO
Operational Amplifiers

General Description

The LMV771/LMV772/LMV774 are Single, Dual, and Quad
low noise precision operational amplifiers intended for use in
a wide range of applications. Other important characteristics
of the family include: an extended operating temperature
range of −40°C to 125°C, the tiny SC70-5 package for the
LMV771, and low input bias current.
The extended temperature range of −40°C to 125°C allows
the LMV771/LMV772/LMV774 to accommodate a broad
range of applications. The LMV771 expands National
Semiconductor's Silicon Dust ™ amplifier portfolio offering en-
hancements in size, speed, and power savings. The LMV771/
LMV772/LMV774 are guaranteed to operate over the voltage
range of 2.7V to 5.0V and all have rail-to-rail output.
The LMV771/LMV772/LMV774 family is designed for preci-
sion, low noise, low voltage, and miniature systems. These
amplifiers provide rail-to-rail output swing into heavy loads.
The maximum input offset voltage for the LMV771 is 850 μV
at room temperature and the input common mode voltage
range includes ground.
The LMV771 is offered in the tiny SC70-5 package, LMV772
in the space saving MSOP-8 and SOIC-8, and the LMV774
in TSSOP-14.

Connection Diagram

Silicon Dust ™ is a trademark of National Semiconductor Corporation.
© 2007 National Semiconductor Corporation
SC70-5
20039667
Top View
200396
Features
(Unless otherwise noted, typical values at V
Guaranteed 2.7V and 5V specifications
Maximum V
(LMV771)
OS
Voltage noise
— f = 100Hz
— f = 10kHz
Rail-to-Rail output swing
= 600Ω
— R
L
— R
= 2kΩ
L
Open loop gain with R
L
V
CM
Supply current (per amplifier)
Gain bandwidth product
Temperature range
Applications
Transducer amplifier
Instrumentation amplifier
Precision current sensing
Data acquisition systems
Active filters and buffers
Sample and hold
Portable/battery powered electronics
Instrumentation Amplifier
April 2007
= 2.7V)
S
850μV (limit)
12.5nV/
7.5nV/
100 mV from rail
50 mV from rail
= 2kΩ
100 dB
0 to V
550 µA
3.5 MHz
−40°C to 125°C
www.national.com
+
-0.9V
20039636

Advertisement

Table of Contents
loading

Summary of Contents for National Semiconductor LMV771

  • Page 1: General Description

    −40°C to 125°C sion, low noise, low voltage, and miniature systems. These amplifiers provide rail-to-rail output swing into heavy loads. The maximum input offset voltage for the LMV771 is 850 μV Applications at room temperature and the input common mode voltage ■...
  • Page 2: Absolute Maximum Ratings

    Absolute Maximum Ratings (Note 1) Wave Soldering Lead Temp If Military/Aerospace specified devices are required, (10 sec) 260°C please contact the National Semiconductor Sales Office/ Storage Temperature Range −65°C to 150°C Distributors for availability and specifications. Junction Temperature (Note 5) 150°C...
  • Page 3: Ac Electrical Characteristics

    > 1MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Condition Units (Note 7) (Note 6) (Note 7) Input Offset Voltage LMV771 0.25 0.85 LMV772/LMV774 0.25 Input Offset Voltage Average Drift −0.35 µV/°C Input Bias Current (Note 8) −0.23 Input Offset Current (Note 8) 0.017...
  • Page 4 5.0V AC Electrical Characteristics (Note 13) Unless otherwise specified, all limits are guaranteed for T = 25°C. V = 5.0V, V − = 0V, V /2, V /2 and R > 1MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Units...
  • Page 5: Connection Diagrams

    Connection Diagrams SC70-5 8-Pin MSOP/SOIC 14-Pin TSSOP 20039667 20039671 Top View 20039672 Top View Top View Ordering Information Package Part Number Package Marking Transport Media NSC Drawing LMV771MG 1k Units Tape and Reel SC70-5 MAA05A LMV771MGX 3k Units Tape and Reel LMV772MA 95 Units/Rail 8-Pin SOIC...
  • Page 6: Typical Performance Characteristics

    Typical Performance Characteristics vs. V Over Temperature vs. V Over Temperature 20039626 20039627 Output Swing vs. V Output Swing vs. V 20039625 20039624 Output Swing vs. V vs. V Over Temperature 20039630 20039623 www.national.com...
  • Page 7 vs. V vs. V 20039628 20039629 (Note 14) (Note 14) Sourcing Current vs. V Sourcing Current vs. V 20039631 20039664 Sinking Current vs. V (Note 14) Sinking Current vs. V (Note 14) 20039632 20039663 www.national.com...
  • Page 8 Input Voltage Noise vs. Frequency Input Bias Current Over Temperature 20039608 20039635 Input Bias Current Over Temperature Input Bias Current Over Temperature 20039634 20039633 THD+N vs. Frequency THD+N vs. V 20039607 20039666 www.national.com...
  • Page 9 Slew Rate vs. Supply Voltage Open Loop Frequency Response Over Temperature 20039601 20039602 Open Loop Frequency Response Open Loop Frequency Response 20039603 20039604 Open Loop Gain & Phase with Cap. Loading Open Loop Gain & Phase with Cap. Loading 20039605 20039606 www.national.com...
  • Page 10 Non-Inverting Small Signal Pulse Response Non-Inverting Large Signal Pulse Response 20039617 20039611 Non-Inverting Small Signal Pulse Response Non-Inverting Large Signal Pulse Response 20039616 20039610 Non-Inverting Small Signal Pulse Response Non-Inverting Large Signal Pulse Response 20039615 20039609 www.national.com...
  • Page 11 Inverting Small Signal Pulse Response Inverting Large Signal Pulse Response 20039619 20039614 Inverting Small Signal Pulse Response Inverting Large Signal Pulse Response 20039620 20039613 Inverting Small Signal Pulse Response Inverting Large Signal Pulse Response 20039618 20039612 www.national.com...
  • Page 12 Stability vs. V Stability vs. V 20039621 20039622 PSRR vs. Frequency CMRR vs. Frequency 20039668 20039665 Crosstalk Rejection vs. Frequency (LMV772/LMV774) 20039694 www.national.com...
  • Page 13: Application Note

    In the input stage of the circuit, current is the same across all Application Note resistors. This is due to the high input impedance and low input bias current of the LMV771. With the node equations we LMV771/LMV772/LMV774 have: The LMV771/LMV772/LMV774 are a family of precision am- plifiers with very low noise and ultra low offset voltage.
  • Page 14: Active Filter

    Now, substituting ω=2πf, so that the calculations are in f(Hz) ACTIVE FILTER and not ω(rad/s), and setting the DC gain H = −R Active filters are circuits with amplifiers, resistors, and capac- H = V itors. The use of amplifiers instead of inductors, which are used in passive filters, enhances the circuit performance while reducing the size and complexity of the filter.
  • Page 15: High Pass Filter

    HIGH PASS FILTER In a similar approach, one can derive the transfer function of a high pass filter. A typical first order high pass filter is shown below: 20039658 20039654 FIGURE 6. Highpass Filter Transfer Function FIGURE 5. Highpass FIlter BAND PASS FILTER Writing the KCL for this circuit : denotes the voltage between C and R...
  • Page 16: State Variable Active Filter

    20039662 FIGURE 8. Bandpass filter Transfer Function STATE VARIABLE ACTIVE FILTER 20039681 State variable active filters are circuits that can simultane- For A the relationship between input and output is: ously represent high pass, band pass, and low pass filters. The state variable active filter uses three separate amplifiers to achieve this task.
  • Page 17 Bandpass Filter The center frequency and Quality Factor for all of these filters is the same. The values can be calculated in the following manner: 20039691 FIGURE 10. Lowpass Filter Frequency Response A design example is shown here: Designing a bandpass filter with center frequency of 10kHz and Quality Factor of 5.5 To do this, first consider the Quality Factor.
  • Page 18: Physical Dimensions

    Physical Dimensions inches (millimeters) unless otherwise noted SC70-5 NS Package Number MAA05A 8-Pin SOIC NS Package Number M08A www.national.com...
  • Page 19 8-Pin MSOP NS Package Number MUA08A 14-Pin TSSOP NS Package Number MTC14 www.national.com...
  • Page 20 National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders.

This manual is also suitable for:

Lmv772Lmv774

Table of Contents