LM7121IM5X

LM7121 LM7121 235 MHz Tiny Low Power Voltage Feedback Amplifier Literature Number: SNOS750 LM7121 235 MHz Tiny Low Power Voltage Feedback Amplifier General Description Features The LM7121 is a high performance operational amplifier which addresses the increasing AC performance needs of video and imaging applications, and the size and power constraints of portable applications. The LM7121 can operate over a wide dynamic range of supply voltages, from 5V (single supply) up to ± 15V (see the Application Information section for more details). It offers an excellent speed-power product delivering 1300V/µs and 235 MHz Bandwidth (−3 dB, AV = +1). Another key feature of this operational amplifier is stability while driving unlimited capacitive loads. Due to its Tiny SOT23-5 package, the LM7121 is ideal for designs where space and weight are the critical parameters. The benefits of the Tiny package are evident in small portable electronic devices, such as cameras, and PC video cards. Tiny amplifiers are so small that they can be placed anywhere on a board close to the signal source or near the input to an A/D converter. (Typical unless otherwise noted) VS = ± 15V n Easy to use voltage feedback topology n Stable with unlimited capacitive loads n Tiny SOT23-5 package — typical circuit layout takes half the space of SO-8 designs n Unity gain frequency: 175 MHz n Bandwidth (−3 dB, AV = +1, RL = 100Ω): 235 MHz n Slew rate: 1300V/µs n Supply Voltages SO-8: 5V to ± 15V SOT23-5: 5V to ± 5V n Characterized for: +5V, ± 5V, ± 15V n Low supply current: 5.3 mA Applications n n n n n n Scanners, color fax, digital copiers PC video cards Cable drivers Digital cameras ADC/DAC buffers Set-top boxes Connection Diagrams 8-Pin SO-8 5-Pin SOT23 DS012348-2 DS012348-1 Top View Top View Ordering Information Package 8-Pin SO-8 5-Pin SOT23-5 Ordering Information NSC Drawing Package Number Marking LM7121IM M08A LM7121IM Rails LM7121IMX M08A LM7121IM 2.5k Tape and Reel LM7121IM5 MA05A A03A 1k Tape and Reel LM7121IM5X MA05A A03A 3k Tape and Reel © 1999 National Semiconductor Corporation DS012348 Supplied As www.national.com LM7121 235 MHz Tiny Low Power Voltage Feedback Amplifier August 1999 Absolute Maximum Ratings (Note 1) Storage Temperature Range Junction Temperature (Note 4) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance (Note 2) Differential Input Voltage (Note 7) Voltage at Input/Output Pin Supply Voltage (V+–V−) Output Short Circuit to Ground (Note 3) Lead Temperature (soldering, 10 sec) −65˚C to +150˚C 150˚C Operating Ratings (Note 1) 2000V ± 2V (V+)−1.4V, (V−)+1.4V 36V 4.5V ≤ VS ≤ 33V 4.5V ≤ VS ≤ 11V −40˚C ≤ TJ ≤ +85˚C Supply Voltage: SO-8 SOT23-5 Junction Temperature Range Thermal Resistance (θJA) M Package, 8-pin Surface Mount SOT23-5 Package Continuous 260˚C 260˚C 165˚C/W 325˚C/W ± 15V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = +15V, V− = −15V, VCM = VO = 0V and RL > 1 MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) LM7121I Units Limit (Note 6) VOS IB IOS RIN Input Offset Voltage 0.9 Input Bias Current 5.2 Input Offset Current Input Resistance 0.04 µA 7 max MΩ Common Mode −10V ≤ VCM ≤ 10V 93 10V ≤ V+ ≤ 15V 86 Rejection Ratio Rejection Ratio −15V ≤ V− ≤ −10V 81 Rejection Ratio Input Common-Mode 4.3 MΩ CMRR VCM max 10 2.3 Negative Power Supply µA 12 3.4 Common Mode −PSRR 9.5 Differential Mode Input Capacitance Positive Power Supply mV max Common Mode CIN +PSRR 8 15 CMRR ≥ 70 dB 13 pF 73 dB 70 min 70 dB 68 min 68 dB 65 min 11 Voltage Range V min −13 −11 V max AV Large Signal RL = 2 kΩ, VO = 20 VPP 72 Voltage Gain VO Output Swing RL = 2 kΩ 13.4 −13.4 RL = 150Ω 10.2 −7.0 ISC Output Short Circuit Sourcing 71 Current Sinking www.national.com 52 2 65 dB 57 min 11.1 V 10.8 min −11.2 V −11.0 max 7.75 V 7.0 min −5.0 V −4.8 max 54 mA 44 min 39 mA 34 min ± 15V DC Electrical Characteristics (Continued) Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = +15V, V− = −15V, VCM = VO = 0V and RL > 1 MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) LM7121I Units Limit (Note 6) Supply Current IS 5.3 6.6 mA 7.5 max ± 15V AC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 15V, V− = −15V, VCM = VO = 0V and RL > 1 MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) LM7121I Units Limit (Note 6) SR 1300 V/µs (Note 8) AV = +2, RL = 1 kΩ, VO = 20 VPP RL = 1 kΩ 175 MHz Slew Rate GBW Unity Gain-Bandwidth φm Phase Margin f (−3 dB) Bandwidth 63 Deg RL = 100Ω, AV = +1 RL = 100Ω, AV = +2 235 MHz Settling Time 10 VPP Step, to 0.1%, RL = 500Ω 74 ns Rise and Fall Time 5.3 ns (Notes 9, 10) ts 50 AD Differential Gain φD Differential Phase AV = +2, RL = 100Ω, VO = 0.4 VPP AV = +2, RL = 150Ω AV = +2, RL = 150Ω en Input-Referred f = 10 kHz 17 f = 10 kHz 1.9 tr, tf (Note 10) 0.3 % 0.65 Deg Voltage Noise Input-Referred in Current Noise T.H.D. Total Harmonic Distortion 2 VPP Output, RL = 150Ω, AV = +2, f = 1 MHz 2 VPP Output, RL = 150Ω, % 0.065 0.52 AV = +2, f = 5 MHz ± 5V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = −5V, VCM = VO = 0V and RL > 1 MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) LM7121I Units Limit (Note 6) VOS IB IOS RIN Input Offset Voltage 1.6 Input Bias Current 5.5 Input Offset Current Input Resistance 0.07 8 mV 15 max 9.5 µA 12 max 4.3 µA 7.0 max Common Mode 6.8 MΩ Differential Mode 3.4 MΩ 3 www.national.com ± 5V DC Electrical Characteristics (Continued) Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = −5V, VCM = VO = 0V and RL > 1 MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) LM7121I Units Limit (Note 6) CIN Input Capacitance Common Mode 2.3 CMRR Common Mode −2V ≤ VCM ≤ 2V 75 +PSRR Positive Power Supply 3V ≤ V+ ≤ 5V 89 Rejection Ratio Rejection Ratio −PSRR Negative Power Supply −5V ≤ V− ≤ −3V 78 Rejection Ratio VCM Input Common Mode CMRR ≥ 60 dB 3 pF 65 dB 60 min 65 dB 60 min 65 dB 60 min 2.5 Voltage Range V min −3 −2.5 V max AV Large Signal RL = 2 kΩ, VO = 3 VPP 66 Voltage Gain VO Output Swing RL = 2 kΩ 3.62 −3.62 RL = 150Ω 3.1 −2.8 ISC Output Short Circuit Sourcing 53 Current Sinking IS 29 Supply Current 5.1 60 dB 58 min 3.0 V 2.75 min −3.0 V −2.70 max 2.5 V 2.3 min −2.15 V −2.00 max 38 mA 33 min 21 mA 19 min 6.4 mA 7.2 max ± 5V AC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = −5V, VCM = VO = 0V and RL > 1 MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) LM7121I Units Limit (Note 6) SR Slew Rate (Note 8) GBW Unity Gain-Bandwidth φm Phase Margin f (−3 dB) Bandwidth (Notes 9, 10) ts tr, tf www.national.com 520 V/µs RL = 1 kΩ RL = 1 kΩ RL = 100Ω, AV = +1 RL = 100Ω, AV = +2 105 MHz 74 Deg 160 MHz 50 Settling Time 5 VPP Step, to 0.1%, RL = 500Ω 65 ns Rise and Fall Time AV = +2, RL = 100Ω, VO = 0.4 VPP AV = +2, RL = 150Ω 5.8 ns 0.3 % (Note 10) AD AV = +2, RL = 1 kΩ, VO = 6 VPP Differential Gain 4 ± 5V AC Electrical Characteristics (Continued) Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = −5V, VCM = VO = 0V and RL > 1 MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) LM7121I Units Limit (Note 6) φD Differential Phase en Input-Referred AV = +2, RL = 150Ω f = 10 kHz 0.65 Deg 17 Voltage Noise Input-Referred in f = 10 kHz 2 Current Noise T.H.D. Total Harmonic Distortion 2 VPP Output, RL = 150Ω, AV = +2, f = 1 MHz 2 VPP Output, RL = 150Ω, % 0.1 0.6 AV = +2, f = 5 MHz +5V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = +5V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) LM7121I Units Limit (Note 6) VOS Input Offset Voltage IB Input Bias Current IOS Input Offset Current RIN Input Resistance Common Mode CIN Input Capacitance CMRR Common Mode 2.4 mV 4 µA 0.04 µA 2.6 MΩ Differential Mode 3.4 MΩ Common Mode 2.3 pF 2V ≤ VCM ≤ 3V 65 dB 4.6V ≤ V+ ≤ 5V 85 dB 0V ≤ V− ≤ 0.4V 61 dB CMRR ≥ 45 dB 3.5 Rejection Ratio +PSRR Positive Power Supply Rejection Ratio −PSRR Negative Power Supply Rejection Ratio VCM Input Common-Mode Voltage Range V min 1.5 V max AV Large Signal RL = 2 kΩ to V+/2 64 dB 3.7 V Voltage Gain VO ISC IS Output Swing RL = 2 kΩ to V+/2, High RL = 2 kΩ to V+/2, Low RL = 150Ω to V+/2, High RL = 150Ω to V+/2, Low 1.3 3.48 1.59 Output Short Circuit Sourcing 33 Current Sinking 20 mA 4.8 mA Supply Current 5 mA www.national.com +5V AC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = +5V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) LM7121I Units Limit (Note 6) SR AV = +2, RL = 1 kΩ to V+/2, VO = 1.8 VPP Slew Rate (Note 8) Rise and Fall Time RL = 1k, to V+/2 RL = 1k to V+/2 RL = 100Ω to V+/2, AV = +1 RL = 100Ω to V+/2, AV = +2 AV = +2, RL = 100Ω, (Note 10) VO = 0.2 VPP Total Harmonic Distortion 0.6 VPP Output, RL = 150Ω, AV = +2, f = 1 MHz 0.6 VPP Output, RL = 150Ω, AV = +2, f = 5 MHz GBW Unity Gain-Bandwidth φm Phase Margin f (−3 dB) Bandwidth (Notes 9, 10) tr, tf T.H.D. 145 V/µs 80 MHz 70 Deg 200 MHz 45 8 ns 0.067 % 0.33 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. Note 2: Human body model, 1.5 kΩ in series with 100 pF. Note 3: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the maximum allowed junction temperature of 150˚C. Note 4: The maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(max)–TA)/θJA. All numbers apply for packages soldered directly into a PC board. Note 5: Typical Values represent the most likely parametric norm. Note 6: All limits are guaranteed by testing or statistical analysis. Note 7: Differential input voltage is measured at VS = ± 15V. Note 8: Slew rate is the average of the rising and fallng slew rates. Note 9: Unity gain operation for ± 5V and ± 15V supplies is with a feedback network of 510Ω and 3 pF in parallel (see the Application Information section). For +5V single supply operation, feedback is a direct short from the output to the inverting input. Note 10: AV = +2 operation with 2 kΩ resistors and 2 pF capacitor from summing node to ground. Typical Performance Characteristics Supply Current vs Supply Voltage TA = 25˚C, RL = 1 MΩ. unless otherwise specified Supply Current vs Temperature Input Offset Voltage vs Temperature DS012348-66 DS012348-67 www.national.com 6 DS012348-68 Typical Performance Characteristics TA = 25˚C, RL = 1 MΩ. unless otherwise specified (Continued) Input Offset Voltage vs Common Mode Voltage @ VS = ± 15V Input Bias Current vs Temperature DS012348-76 DS012348-69 Short Circuit Current vs Temperature (Sourcing) Input Offset Voltage vs Common Mode Voltage @ VS = ± 5V Short Circuit Current vs Temperature (Sinking) Output Voltage vs Output Current (ISINK, VS = ± 15V) DS012348-79 DS012348-78 Output Voltage vs Output Current (ISOURCE, VS = ± 15V) DS012348-77 Output Voltage vs Output Current (ISOURCE, VS = ± 5V) DS012348-72 DS012348-71 7 DS012348-70 Output Voltage vs Output Current (ISINK, VS = ± 5V) DS012348-73 www.national.com Typical Performance Characteristics Output Voltage vs Output Current (ISOURCE, VS = +5V) TA = 25˚C, RL = 1 MΩ. unless otherwise specified (Continued) Output Voltage vs Output Current (ISINK, VS = +5V) DS012348-88 DS012348-5 DS012348-4 Open Loop Frequency Response DS012348-89 www.national.com Open Loop Frequency Response PSRR vs Frequency Open Loop Frequency Response DS012348-3 DS012348-75 DS012348-74 PSRR vs Frequency CMRR vs Frequency Unity Gain Frequency vs Supply Voltage DS012348-90 8 DS012348-24 Typical Performance Characteristics GBWP @ 10 MHz vs Supply Voltage TA = 25˚C, RL = 1 MΩ. unless otherwise specified (Continued) Large Signal Voltage Gain vs Load, VS = ± 15V DS012348-25 Input Voltage Noise vs Frequency Large Signal Voltage Gain vs Load, VS = ± 5V Input Current Noise vs Frequency DS012348-27 Input Current Noise vs Frequency DS012348-97 DS012348-96 Input Voltage Noise vs Frequency DS012348-28 Slew Rate vs Supply Voltage DS012348-30 DS012348-31 9 DS012348-29 Slew Rate vs Input Voltage DS012348-32 www.national.com Typical Performance Characteristics TA = 25˚C, RL = 1 MΩ. unless otherwise specified (Continued) Slew Rate vs Load Capacitance Slew Rate vs Input Voltage Large Signal Pulse Response, AV = −1, VS = ± 15V DS012348-35 DS012348-33 Large Signal Pulse Response, AV = −1, VS = ± 5V DS012348-34 Large Signal Pulse Response, AV = −1, VS = +5V DS012348-37 DS012348-36 Large Signal Pulse Response, AV = +1, VS = ± 5V DS012348-38 Large Signal Pulse Response, AV = +1, VS = +5V DS012348-40 DS012348-39 www.national.com Large Signal Pulse Response, AV = +1, VS = ± 15V 10 Large Signal Pulse Response, AV = +2, VS = ± 15V DS012348-41 Typical Performance Characteristics Large Signal Pulse Response, AV = +2, VS = ± 5V TA = 25˚C, RL = 1 MΩ. unless otherwise specified (Continued) Large Signal Pulse Response, AV = +2, VS = +5V DS012348-42 DS012348-43 Small Signal Pulse Response, AV = −1, VS = ± 5V, RL = 100Ω Small Signal Pulse Response, AV = −1, VS = +5V, RL = 100Ω Small Signal Pulse Response, AV = −1, VS = ± 15V, RL = 100Ω DS012348-44 Small Signal Pulse Response, AV = +1, VS = ± 15V, RL = 100Ω DS012348-45 DS012348-46 Small Signal Pulse Response, AV = +1, VS = ± 5V, RL = 100Ω Small Signal Pulse Response, AV = +1, VS = +5V, RL = 100Ω DS012348-48 DS012348-49 11 DS012348-47 Small Signal Pulse Response, AV = +2, VS = ± 15V, RL = 100Ω DS012348-50 www.national.com Typical Performance Characteristics Small Signal Pulse Response, AV = +2, VS = ± 5V, RL = 100Ω TA = 25˚C, RL = 1 MΩ. unless otherwise specified (Continued) Small Signal Pulse Response, AV = +2, VS = +5V, RL = 100Ω DS012348-51 Closed Loop Frequency Response vs Temperature VS = ± 15V, AV = +1, RL = 100Ω DS012348-52 DS012348-53 Closed Loop Frequency Response vs Temperature VS = ± 5V, AV = +1, RL = 100Ω Closed Loop Frequency Response vs Temperature VS = +5V, AV = +1, RL = 100Ω Closed Loop Frequency Response vs Temperature VS = ± 15V, AV = +2, RL = 100Ω DS012348-55 DS012348-54 DS012348-58 Closed Loop Frequency Response vs Temperature VS = ± 5V, AV = +2, RL = 100Ω Closed Loop Frequency Response vs Temperature VS = +5V, AV = +2, RL = 100Ω DS012348-59 Closed Loop Frequency Response vs Capacitive Load (AV = +1, VS = ± 15V) DS012348-60 DS012348-61 www.national.com 12 Typical Performance Characteristics Closed Loop Frequency Response vs Capacitive Load (AV = +1, VS = ± 5V) TA = 25˚C, RL = 1 MΩ. unless otherwise specified (Continued) Closed Loop Frequency Response vs Capacitive Load (AV = +2, VS = ± 15V) DS012348-62 Total Harmonic Distortion vs Frequency Closed Loop Frequency Response vs Capacitive Load (AV = +2, VS = ± 5V) DS012348-63 Total Harmonic Distortion vs Frequency DS012348-80 Total Harmonic Distortion vs Frequency DS012348-64 Total Harmonic Distortion vs Frequency DS012348-81 Undistorted Output Swing vs Frequency DS012348-82 Undistorted Output Swing vs Frequency DS012348-85 13 DS012348-83 DS012348-84 www.national.com Typical Performance Characteristics TA = 25˚C, RL = 1 MΩ. unless otherwise specified (Continued) Undistorted Output Swing vs Frequency Total Power Dissipation vs Ambient Temperature DS012348-86 DS012348-65 Application Information In determining maximum operable temperature of the device, make sure the total power dissipation of the device is considered; this includes the power dissipated in the device with a load connected to the output as well as the nominal dissipation of the op amp. The device is capable of tolerating momentary short circits from its output to ground but prolonged operation in this mode will damage the device, if the maximum allowed junction temperation is exceeded. The table below, depicts the maximum operating supply voltage for each package type: TABLE 1. Maximum Supply Voltage Values SOT23-5 SO-8 Single Supply 10V 30V Dual Supplies ± 5V ± 15V Stable unity gain operation is possible with supply voltage of 5V for all capacitive loads. This allows the possibility of using the device in portable applications with low supply voltages with minimum components around it. Above a supply voltage of 6V ( ± 3V Dual supplies), an additional resistor and capacitor (shown below) should be placed in the feedback path to achieve stability at unity gain over the full temperature range. APPLICATION CIRCUITS Current Boost Circuit The circuit in Figure 2 can be used to achieve good linearity along with high output current capability. DS012348-92 FIGURE 2. Simple Circuit to Improve Linearity and Output Drive Current DS012348-87 FIGURE 1. Typical Circuit for AV = +1 Operation (VS ≥ 6V) By proper choice of R3, the LM7121 output can be set to supply a minimal amount of current, thereby improving its output linearity. The package power dissipation should be taken into account when operating at high ambient temperatures and/or high power dissipative conditions. Refer to the power derating curves in the data sheet for each type of package. www.national.com R3 can be adjusted to allow for different loads: R3 = 0.1 RL The circuit above has been set for a load of 100Ω. Reasonable speeds ( < 30 ns rise and fall times) can be expected up to 120 mAPP of load current (see Figure 3 for step response across the load). 14 Application Information (Continued) DS012348-93 FIGURE 3. Waveform across a 100Ω Load Color Video on Twisted Pairs Using Single Supply The circuit shown in Figure 4 can be used to drive in excess of 25 meters length of twisted pair cable with no loss of resolution or picture definition when driving a NTSC monitor at the load end. It is very important to keep the lead lengths to a minimum and to provide a low impedance current path by using a ground-plane on the board. Caution: If RL is removed, the current balance at the output of LM7121 would be disturbed and it would have to supply the full amount of load current. This might damage the part if power dissipation limit is exceeded. 15 www.national.com Application Information (Continued) DS012348-94 Note: Pin numbers shown are for SO-8 package. *Input termination of NTSC monitor. FIGURE 4. Single Supply Differential Twister Pair Cable Transmitter/Receiver 8.5V ≤ VCC ≤ 30V Even though the transmission line is not terminated in its nominal characteristic impedance of about 600Ω, the resulting reflection at the load is only about 5% of the total signal and in most cases can be neglected. Using 75Ω termination instead, has the advantage of operating at a low impedance and results in a higher realizable bandwidth and signal fidelity. Differential Gain and Differential Phase errors measured at the load are less than 1% and 1˚ respectively. RG and CC can be adjusted for various cable lengths to compensate for the line losses and for proper response at the output. Values shown correspond to a twisted pair cable length of 25 meters with about 3 turns/inch (see Figure 5 for step response). The supply voltage can vary from 8.5V up to 30V with the output rise and fall times under 12 ns. With the component values shown, the overall gain from the input to the output is about 1. www.national.com 16 Application Information (Continued) DS012348-95 FIGURE 5. Step Response to a 1 VPP Input Signal Measured across the 75Ω Load DS012348-98 (a) AV = −1 DS012348-99 CC = 2 pF for RL = 100Ω CC = Open for RL = Open (b) AV = +2 DS012348-A0 (c) AV = +2, Capacitive Load DS012348-A1 RF = 0Ω, CC = Open for VS < 6V RF = 510Ω, CC = 3 pF for VS ≥ 6V (d) AV = +1 DS012348-A2 (e) AV = +1, VS = +5V, Single Supply Operation FIGURE 6. Application Test Circuits 17 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead (0.150" Wide) Small Outline Package, JEDEC Order Number LM7121IM or LM7121IMX NS Package Number M08A www.national.com 18 LM7121 235 MHz Tiny Low Power Voltage Feedback Amplifier Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 5-Lead Molded SOT23-5 Order Number LM7121IM5 or LM7121IM5X NS Package Number MA05A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. 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