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Summary of Contents for Texas Instruments LMP7731
- Page 1 LMP7731 LMP7731 2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO Amplifier Literature Number: SNOSAT6D...
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Page 2: General Description
This operational amplifier offers low voltage noise of 2.9 nV/ CMRR 130 dB √ Hz with a 1/f corner of only 3 Hz. The LMP7731 has bipolar ■ Open loop gain 130 dB input stages with a bias current of only 1.5 nA. This low input ■... -
Page 3: Absolute Maximum Ratings
Storage Temperature Range −65°C to 150°C Absolute Maximum Ratings (Note 1) Junction Temperature (Note 3) +150°C max If Military/Aerospace specified devices are required, Soldering Information please contact the National Semiconductor Sales Office/ Infrared or Convection (20 sec) 235°C Distributors for availability and specifications. Wave Soldering Lead Temp. - Page 4 Symbol Parameter Conditions Units (Note 6) (Note 5) (Note 6) = 10 kΩ to V Output Voltage Swing High = 2 kΩ to V mV from either rail = 10 kΩ to V Output Voltage Swing Low = 2 kΩ to V Sourcing, V (diff) = 100 mV Output Current...
- Page 5 Symbol Parameter Conditions Units (Note 6) (Note 5) (Note 6) Input Offset Current Drift = 0.5V and V = 2.5V 0.048 nA/°C ≤ ≤ 0.15V 0.7V ≤ ≤ 0.23V 0.7V CMRR Common Mode Rejection Ratio ≤ ≤ 1.5V 3.15V ≤ ≤...
- Page 6 5V Electrical Characteristics (Note 4) Unless otherwise specified, all limits are guaranteed for T = 25°C, V = 5V, V − = 0V, V /2, R > 10 kΩ to V /2. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Units...
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Page 7: Connection Diagrams
Symbol Parameter Conditions Units (Note 6) (Note 5) (Note 6) Gain Margin = 20 pF, R = 10 kΩ to V Φ Phase Margin = 20 pF, R = 10 kΩ to V Differential Mode kΩ Input Resistance Common Mode MΩ... -
Page 8: Typical Performance Characteristics
Typical Performance Characteristics Unless otherwise noted: T = 25°C, R > 10 kΩ, V Offset Voltage Distribution Distribution 20175238 20175234 Offset Voltage Distribution Distribution 20175239 20175236 Offset Voltage Distribution Distribution 20175240 20175235 www.national.com... - Page 9 Offset Voltage Distribution Distribution 20175241 20175237 Offset Voltage vs. Temperature Offset Voltage vs. Temperature 20175251 20175252 PSRR vs. Frequency CMRR vs. Frequency 20175256 20175229 www.national.com...
- Page 10 Offset Voltage vs. Supply Voltage Offset Voltage vs. V 20175242 20175243 Offset Voltage vs. V Offset Voltage vs. V 20175245 20175244 Input Offset Voltage Time Drift Slew Rate vs. Supply Voltage 20175220 20175230 www.national.com...
- Page 11 Time Domain Voltage Noise Time Domain Voltage Noise 20175267 20175269 Time Domain Voltage Noise Output Voltage vs. Output Current 20175268 20175259 Input Bias Current vs. V Input Bias Current vs. V 20175226 20175225 www.national.com...
- Page 12 Input Bias Current vs. V Open Loop Frequency Response Over Temperature 20175218 20175227 Open Loop Frequency Response Open Loop Frequency Response 20175228 20175219 THD+N vs. Frequency THD+N vs. Output Voltage 20175257 20175258 www.national.com...
- Page 13 Large Signal Step Response Small Signal Step Response 20175222 20175221 Large Signal Step Response Small Signal Step Response 20175224 20175223 Supply Current vs. Supply Voltage Output Swing High vs. Supply Voltage 20175246 20175250 www.national.com...
- Page 14 Output Swing Low vs. Supply Voltage Sinking Current vs, Supply Voltage 20175249 20175247 Sourcing Current vs. Supply Voltage 20175248 www.national.com...
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Page 15: Application Information
I on IN of the amplifier. This The LMP7731 is a single, low noise, rail-to-rail input and out- voltage contributes to the offset voltage of the amplifier. When put, and low voltage amplifier. common mode voltage is in the mid-range, the transistors are √... -
Page 16: Diodes Between The Inputs
DIODES BETWEEN THE INPUTS The LMP7731 has a set of anti-parallel diodes between the input pins as shown in Figure 5. These diodes are present to protect the input stage of the amplifier. At the same time, they limit the amount of differential input voltage that is allowed on the input pins. -
Page 17: Driving An Adc
DRIVING AN ADC Analog to Digital Converters, ADCs, usually have a sampling capacitor on their input. When the ADC's input is directly con- nected to the output of the amplifier a charging current flows from the amplifier to the ADC. This charging current causes a momentary glitch that can take some time to settle. -
Page 18: Physical Dimensions
Physical Dimensions inches (millimeters) unless otherwise noted 5-Pin SOT-23 NS Package Number MF05A 8-Pin SOIC NS Package Number M08A www.national.com... - Page 19 Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface...
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Page 20: Important Notice
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
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