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Related Manuals for National Semiconductor LM7705
Summary of Contents for National Semiconductor LM7705
- Page 1 LM7705 LM7705 Low Noise Negative Bias Generator Literature Number: SNVS420A...
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Page 2: General Description
June 10, 2009 LM7705 Low Noise Negative Bias Generator General Description Features ■ The LM7705 is a switched capacitor voltage inverter with a Regulated output voltage −0.232V ■ low noise, −0.23V fixed negative voltage regulator. This de- Output voltage tolerance ■... -
Page 3: Absolute Maximum Ratings
Charge Device Model 750V Absolute Maximum Ratings (Note 1) Storage Temp. Range −65°C to 150°C If Military/Aerospace specified devices are required, Junction Temperature (Note 7) 150°C max please contact the National Semiconductor Sales Office/ Mounting Temperature Distributors for availability and specifications. Infrared or Convection (20 sec) 260°C Supply Voltage... - Page 4 5.0V Electrical Characteristics Unless otherwise specified, all limits are guaranteed for T = 25°C, V 5.0V, V = 0V, SD = 0V, C = 5 µF, C = 22 µF, C = 22 µF. Boldfacelimits apply at temperature extremes (Note 5). Symbol Parameter Conditions...
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Page 5: Connection Diagram
Negative Capacitor Connection Ordering Information Package Part Number Package Marking Transport Media NSC Drawing LM7705MM 1k Units Tape and Reel 8-Pin MSOP LM7705MME F26A 250 Units Tape and Reel MUA08A LM7705MMX 3.5k Units Tape and Reel Block Diagram 20173003 LM7705 www.national.com... -
Page 6: Typical Performance Characteristics
Typical Performance Characteristics = 3.3V and T = 25°C unless otherwise noted. Output Voltage vs. Supply Voltage Supply Current vs. Supply Voltage 20173010 20173011 Output Voltage vs. Output Current Output Voltage vs. Output Current 20173012 20173013 Output Voltage Ripple vs. Temperature Output Voltage Ripple vs. - Page 7 Supply Current vs. Output Current Supply Current vs. Output Current 20173016 20173017 Current Conversion Efficiency vs. Output Current Current Conversion Efficiency vs. Output Current 20173018 20173019 Turn On Time Turn On Time 20173020 20173021 www.national.com...
- Page 8 Load Regulation vs. Temperature Load Regulation vs. Temperature 20173023 20173022 Transient Response Transient Response 20173024 20173025 Transient Response Transient Response 20173029 20173030 www.national.com...
- Page 9 Output voltage vs. shutdown Voltage Supply Current vs. Shutdown Voltage 20173026 20173027 Oscillator Frequency vs. Temperature 20173028 www.national.com...
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Page 10: Application Information
A key • Post-regulator application for the LM7705 is an amplifier with a true zero The output voltage is stabilized by: output voltage using the original parts, while not exceeding the maximum supply voltage ratings of the amplifier. -
Page 11: General Amplifier Application
Key Specification voltage V . The total charge on capacitor C is Q The key specifications for the LM7705 are given in the fol- . The switch then moves to position B, discharging C lowing overview: voltage V . After this discharge, the charge on C will be . - Page 12 20173035 FIGURE 8. Sensor with DC Output and a Single Supply Op Amp The sensor has a DC output signal that is amplified by the op amp. For an optimal signal-to-noise ratio, the output voltage swing of the op amp should be matched to the input voltage 20173040 range of the Analog to Digital Converter (ADC).
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Page 13: Typical Amplifier Application
If the op amps used in the current solution can’t handle this, a redesign can be required. A better solution is to use the LM7705. This low noise negative bias generator has some major advantages with respect to a dual supply solution:... -
Page 14: Design Recommendations
ADC Voltage Reference to ground level or connected to the output of the LM7705. LMP7701 Figure 12A and Figure 12B show the digitized output voltage... -
Page 15: Physical Dimensions
Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin MSOP NS Package Number MUA08A www.national.com... - Page 16 Notes www.national.com...
- Page 17 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 18: 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.