LMP2011_08 NSC | Alldatasheet
Document overview
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Technical content
Features
(For VS = 5V, Typical unless otherwise noted) ■ Low guaranteed VOS over temperature 60 µV ■ Low noise with no 1/f 35nV/√Hz ■ High CMRR 130 dB ■ High PSRR 120 dB ■ High AVOL 130 dB ■ Wide gain-bandwidth product 3MHz ■ High slew rate 4V/µs ■ Low supply current 930µA ■ Rail-to-rail output 30mV ■ No external capacitors required
Applications
■ Precision instrumentation amplifiers ■ Thermocouple amplifiers ■ Strain gauge bridge amplifier Connection Diagrams 5-Pin SOT23 20071502 Top View 8-Pin SOIC 20071542 Top View 8-Pin MSOP 20071538 Top View
Ordering Information
Package Part Number Temperature Range Package Marking Transport Media NSC Drawing 5-Pin SOT23 LMP2011MF −40°C to 125°C AN1A 1k Units Tape and Reel MF05ALMP2011MFX 3k Units Tape and Reel 8-Pin MSOP LMP2012MM AP1A 1k Units Tape and Reel MUA08ALMP2012MMX 3.5k Units Tape and Reel 8-Pin SOIC LMP2011MA LMP2011MA 95 Units/Rail M08ALMP2011MAX 2.5k Units Tape and Reel LMP2012MA LMP2012MA 95 Units/Rail LMP2012MAX 2.5k Units Tape and Reel © 2008 National Semiconductor Corporation 200715 www.national.com LMP2011 Single/LMP2012 Dual High Precision, Rail-to-Rail Output Operational Amplifier
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 Human Body Model 2000V Machine Model 200V Supply Voltage 5.8V Common-Mode Input Voltage −0.3 ≤ VCM ≤ VCC +0.3V Lead Temperature (soldering 10 sec.) +300°C Differential Input Voltage ±Supply Voltage Current at Input Pin 30 mA Current at Output Pin 30 mA Current at Power Supply Pin 50 mA Operating Ratings (Note 1) Supply Voltage 2.7V to 5.25V Storage Temperature Range −65°C to 150°C Operating Temperature Range −40°C to 125°C 2.7V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25°C, Symbol Parameter Conditions Min (Note 3) Typ (Note 2) Max (Note 3) Units VOS Input Offset Voltage (LMP2011 only) 0.8 25 μVInput Offset Voltage (LMP2012 only) 0.8 36 Offset Calibration Time 0.5 10 ms TCVOS Input Offset Voltage 0.015 μV/°C Long-Term Offset Drift 0.006 μV/month Lifetime VOS Drift 2.5 μV IIN Input Current -3 pA IOS Input Offset Current 6 pA RIND Input Differential Resistance 9 MΩ CMRR Common Mode Rejection Ratio −0.3 ≤ VCM ≤ 0.9V 0 ≤ VCM ≤ 0.9V 130 dB PSRR Power Supply Rejection Ratio 95 120 dB AVOL Open Loop Voltage Gain RL = 10 kΩ 95 130 dB RL = 2 kΩ 90 124 VO Output Swing (LMP2011 only) RL = 10 kΩ to 1.35V VIN(diff) = ±0.5V 2.665 2.655 2.68 V 0.033 0.060 0.075 RL = 2 kΩ to 1.35V VIN(diff) = ±0.5V 2.630 2.615 2.65 V 0.061 0.085 0.105 Output Swing (LMP2012 only) RL = 10 kΩ to 1.35V VIN(diff) = ±0.5V 2.64 2.63 2.68 V 0.033 0.060 0.075 RL = 2 kΩ to 1.35V VIN(diff) = ±0.5V 2.615 2.6 2.65 V 0.061 0.085 0.105 www.national.com 2 LMP2011 Single/LMP2012 Dual
Symbol Parameter Conditions Min (Note 3) Typ (Note 2) Max (Note 3) Units IO Output Current Sourcing, VO = 0V VIN(diff) = ±0.5V mASinking, VO = 5V VIN(diff) = ±0.5V IS Supply Current per Channel 0.919 1.20 1.50 mA 2.7V AC Electrical Characteristics TJ = 25°C, V+ = 2.7V, V− = 0V, VCM = 1.35V, VO = 1.35V, and RL > 1 MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min (Note 3) Typ (Note 2) Max (Note 3) Units GBW Gain-Bandwidth Product 3 MHz SR Slew Rate 4 V/μs θ m Phase Margin 60 Deg Gm Gain Margin −14 dB en Input-Referred Voltage Noise 35 nV/ in Input-Referred Current Noise pA/ enp-p Input-Referred Voltage Noise RS = 100Ω, DC to 10 Hz 850 nVpp trec Input Overload Recovery Time 50 ms V− = 0V, V CM = 2.5V, VO = 2.5V and RL > 1MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min (Note 3) Typ (Note 2) Max (Note 3) Units VOS Input Offset Voltage (LMP2011 only) 0.12 25 μVInput Offset Voltage (LMP2012 only) 0.12 36 Offset Calibration Time 0.5 10 ms TCVOS Input Offset Voltage 0.015 μV/°C Long-Term Offset Drift 0.006 μV/month Lifetime VOS Drift 2.5 μV IIN Input Current -3 pA IOS Input Offset Current 6 pA RIND Input Differential Resistance 9 MΩ CMRR Common Mode Rejection Ratio −0.3 ≤ VCM ≤ 3.2 0 ≤ VCM ≤ 3.2 100 130 dB PSRR Power Supply Rejection Ratio 95 120 dB AVOL Open Loop Voltage Gain RL = 10 kΩ 105 100 130 dB RL = 2 kΩ 95 132 3 www.national.com LMP2011 Single/LMP2012 Dual
Symbol Parameter Conditions Min (Note 3) Typ (Note 2) Max (Note 3) Units VO Output Swing (LMP2011 only) RL = 10 kΩ to 2.5V VIN(diff) = ±0.5V 4.96 4.95 4.978 V 0.040 0.070 0.085 RL = 2 kΩ to 2.5V VIN(diff) = ±0.5V 4.895 4.875 4.919 V 0.091 0.115 0.140 Output Swing (LMP2012 only) RL = 10 kΩ to 2.5V VIN(diff) = ±0.5V 4.92 4.91 4.978 V 0.040 0.080 0.095 RL = 2 kΩ to 2.5V VIN(diff) = ±0.5V 4.875 4.855 4.919 V 0.0.91 0.125 0.150 IO Output Current Sourcing, VO = 0V VIN(diff) = ±0.5V mASinking, VO = 5V V IN(diff) = ±0.5V IS Supply Current per Channel 0.930 1.20 1.50 mA Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min (Note 3) Typ (Note 2) Max (Note 3) Units GBW Gain-Bandwidth Product 3 MHz SR Slew Rate 4 V/μs θ m Phase Margin 60 deg Gm Gain Margin −15 dB en Input-Referred Voltage Noise 35 nV/ in Input-Referred Current Noise pA/ enp-p Input-Referred Voltage Noise RS = 100Ω, DC to 10 Hz 850 nVpp trec Input Overload Recovery Time 50 ms Note 1: Absolute Maximum Ratings indicate limits beyond which damage 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 test conditions, see the Electrical Characteristics. Note 2: Typical values represent the most likely parametric norm. Note 3: Limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlations using statistical quality control (SQC) method. www.national.com 4 LMP2011 Single/LMP2012 Dual
Typical Performance Characteristics TA=25C, VS= 5V unless otherwise specified. Supply Current vs. Supply Voltage 20071555 Offset Voltage vs. Supply Voltage 20071556 Offset Voltage vs. Common Mode 20071557 Offset Voltage vs. Common Mode 20071558 Voltage Noise vs. Frequency 20071504 Input Bias Current vs. Common Mode 20071503 5 www.national.com LMP2011 Single/LMP2012 Dual
PSRR vs. Frequency 20071507 PSRR vs. Frequency 20071506 Output Sourcing @ 2.7V 20071559 Output Sourcing @ 5V 20071560 Output Sinking @ 2.7V 20071561 Output Sinking @ 5V 20071562 www.national.com 6 LMP2011 Single/LMP2012 Dual
Max Output Swing vs. Supply Voltage 20071563 Max Output Swing vs. Supply Voltage 20071564 Min Output Swing vs. Supply Voltage 20071565 Min Output Swing vs. Supply Voltage 20071566 CMRR vs. Frequency 20071505 Open Loop Gain and Phase vs. Supply Voltage 20071508 7 www.national.com LMP2011 Single/LMP2012 Dual
Open Loop Gain and Phase vs. RL @ 2.7V 20071509 Open Loop Gain and Phase vs. RL @ 5V 20071510 Open Loop Gain and Phase vs. CL @ 2.7V 20071511 Open Loop Gain and Phase vs. CL @ 5V 20071512 Open Loop Gain and Phase vs. Temperature @ 2.7V 20071536 Open Loop Gain and Phase vs. Temperature @ 5V 20071537 www.national.com 8 LMP2011 Single/LMP2012 Dual
THD+N vs. AMPL 20071514 THD+N vs. Frequency 20071513 0.1 Hz − 10 Hz Noise vs. Time 20071515 9 www.national.com LMP2011 Single/LMP2012 Dual
Application Information
Using patented methods, the LMP201X eliminates the 1/f noise present in other amplifiers. That noise, which increases as frequency decreases, is a major source of measurement error in all DC-coupled measurements. Low-frequency noise appears as a constantly-changing signal in series with any measurement being made. As a result, even when the mea- surement is made rapidly, this constantly-changing noise sig- nal will corrupt the result. The value of this noise signal can be surprisingly large. For example: If a conventional amplifier has a flat-band noise level of 10nV/ and a noise corner of 10 Hz, the RMS noise at 0.001 Hz is 1µV/ . This is equiv- alent to a 0.50 µV peak-to-peak error, in the frequency range 0.001 Hz to 1.0 Hz. In a circuit with a gain of 1000, this pro- duces a 0.50 mV peak-to-peak output error. This number of
0.001 Hz might appear unreasonably low, but when a data
acquisition system is operating for 17 minutes, it has been on long enough to include this error. In this same time, the LM- P201X will only have a 0.21 mV output error. This is smaller by 2.4 x. Keep in mind that this 1/f error gets even larger at lower frequencies. At the extreme, many people try to reduce this error by integrating or taking several samples of the same signal. This is also doomed to failure because the 1/f nature of this noise means that taking longer samples just moves the measurement into lower frequencies where the noise level is even higher. The LMP201X eliminates this source of error. The noise level is constant with frequency so that reducing the bandwidth re- duces the errors caused by noise. Another source of error that is rarely mentioned is the error voltage caused by the inadvertent thermocouples created when the common "Kovar type" IC package lead materials are soldered to a copper printed circuit board. These steel-based leadframe materials can produce over 35 μV/°C when sol- dered onto a copper trace. This can result in thermocouple noise that is equal to the LMP201X noise when there is a temperature difference of only 0.0014°C between the lead and the board! For this reason, the lead-frame of the LMP201X is made of copper. This results in equal and opposite junctions which cancel this effect. The extremely small size of the SOT-23 package results in the leads being very close together. This further reduces the probability of temperature differences and hence decreases thermal noise. OVERLOAD RECOVERY The LMP201X recovers from input overload much faster than most chopper-stabilized op amps. Recovery from driving the amplifier to 2X the full scale output, only requires about 40 ms. Many chopper-stabilized amplifiers will take from 250 ms to several seconds to recover from this same overload. This is because large capacitors are used to store the unadjusted offset voltage. 20071516 FIGURE 1. Overload Recovery Test width of the output stage and large total GBW. from turn-on until the amplifier's error has settled. The LMP201X offers the benefits mentioned above and more. dB of CMRR, 120 dB of PSRR and 130 dB of open loop gain. bandwidth product and 4 V/µs of slew rate. much worse. Compare this plot with Figure 3 of the LMP201X.
der "The Benefits of the LMP201X" section above). FIGURE 8. DC Coupled ADC Driver
Physical Dimensions inches (millimeters) unless otherwise noted 5-Pin SOT23 8-Pin MSOP www.national.com 14 LMP2011 Single/LMP2012 Dual
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