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LM7121 235 MHz Tiny Low Power Voltage Feedback Amplifier
February 1996
LM7121 235 MHz Tiny Low Power Voltage Feedback Amplifier
General Description
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/s 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. 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 = 100): 235 MHz n Slew rate: 1300V/s n Supply Voltages DIP/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
Features
(Typical unless otherwise noted) VS = 15V
Connection Diagrams
8-Pin DIP/SO-8 5-Pin SOT23
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Top View
Top View
Ordering Information
Package 8-Pin Molded DIP 8-Pin SO-8 5-Pin SOT23-5 Ordering Information LM7121IN LM7121IM LM7121IMX LM7121IM5X NSC Drawing Number N08E M08A M08A MA05A Package Marking LM7121IN LM7121IM LM7121IM A03A Rails Rails 2.5k Tape and Reel 3k Tape and Reel Supplied As
(c) 1999 National Semiconductor Corporation
DS012348
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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 (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) 2000V
Storage Temperature Range Junction Temperature (Note 4)
-65C to +150C 150C
Operating Ratings (Note 1)
Supply Voltage: DIP/SO-8 SOT23-5 Junction Temperature Range Thermal Resistance (JA) N Package, 8-pin Molded DIP M Package, 8-pin Surface Mount SOT23-5 Package 4.5V VS 33V 4.5V VS 11V -40C TJ +85C 115C/W 165C/W 325C/W
2V
(V+)-1.4V, (V-)+1.4V 36V Continuous 260C 260C
15V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25C, V+ = +15V, V- = -15V, VCM = VO = 0V and RL > 1 M. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) LM7121I Limit (Note 6) VOS IB IOS RIN CIN CMRR +PSRR -PSRR VCM Input Offset Voltage Input Bias Current Input Offset Current Input Resistance Input Capacitance Common Mode Rejection Ratio Positive Power Supply Rejection Ratio Negative Power Supply Rejection Ratio Input Common-Mode Voltage Range -13 AV VO Large Signal Voltage Gain Output Swing RL = 2 k 13.4 -13.4 RL = 150 10.2 -7.0 ISC Output Short Circuit Current Sinking 52 Sourcing 71 RL = 2 k, VO = 20 VPP 72 -11 65 57 11.1 10.8 -11.2 -11.0 7.75 7.0 -5.0 -4.8 54 44 39 34 CMRR 70 dB 13 -15V V- -10V 81 10V V+ 15V 86 Common Mode Differential Mode Common Mode -10V VCM 10V 0.9 5.2 0.04 10 3.4 2.3 93 73 70 70 68 68 65 11 8 15 9.5 12 4.3 7 mV max A max A max M M pF dB min dB min dB min V min V max dB min V min V max V min V max mA min mA min Units
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15V DC Electrical Characteristics
Symbol Parameter
(Continued)
Unless otherwise specified, all limits guaranteed for TJ = 25C, V+ = +15V, V- = -15V, VCM = VO = 0V and RL > 1 M. Boldface limits apply at the temperature extremes. Conditions Typ (Note 5) LM7121I Limit (Note 6) IS Supply Current 5.3 6.6 7.5 mA max Units
15V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25C, V+ = 15V, V- = -15V, VCM = VO = 0V and RL > 1 M. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) LM7121I Limit (Note 6) SR GBW m f (-3 dB) ts tr, tf AD D en Slew Rate (Note 8) Unity Gain-Bandwidth Phase Margin Bandwidth (Notes 9, 10) Settling Time Rise and Fall Time (Note 10) Differential Gain Differential Phase Input-Referred Voltage Noise in T.H.D. Input-Referred Current Noise Total Harmonic Distortion 2 VPP Output, RL = 150, AV = +2, f = 1 MHz 2 VPP Output, RL = 150, AV = +2, f = 5 MHz 0.065 0.52 % f = 10 kHz 1.9 RL = 100, AV = +1 RL = 100, AV = +2 10 VPP Step, to 0.1%, RL = 500 AV = +2, RL = 100, VO = 0.4 VPP AV = +2, RL = 150 AV = +2, RL = 150 f = 10 kHz AV = +2, RL = 1 k, VO = 20 VPP RL = 1 k 1300 175 63 235 50 74 5.3 0.3 0.65 17 ns ns % Deg V/s MHz Deg MHz Units
5V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25C, V+ = 5V, V- = -5V, VCM = VO = 0V and RL > 1 M. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) LM7121I Limit (Note 6) VOS IB IOS RIN Input Offset Voltage Input Bias Current Input Offset Current Input Resistance Common Mode Differential Mode 1.6 5.5 0.07 6.8 3.4 8 15 9.5 12 4.3 7.0 mV max A max A max M M Units
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5V DC Electrical Characteristics
Symbol Parameter
(Continued)
Unless otherwise specified, all limits guaranteed for TJ = 25C, V+ = 5V, V- = -5V, VCM = VO = 0V and RL > 1 M. Boldface limits apply at the temperature extremes. Conditions Typ (Note 5) LM7121I Limit (Note 6) CIN CMRR +PSRR -PSRR VCM Input Capacitance Common Mode Rejection Ratio Positive Power Supply Rejection Ratio Negative Power Supply Rejection Ratio Input Common Mode Voltage Range -3 AV VO Large Signal Voltage Gain Output Swing RL = 2 k 3.62 -3.62 RL = 150 3.1 -2.8 ISC Output Short Circuit Current Sinking IS Supply Current 29 5.1 Sourcing 53 RL = 2 k, VO = 3 VPP 66 -2.5 60 58 3.0 2.75 -3.0 -2.70 2.5 2.3 -2.15 -2.00 38 33 21 19 6.4 7.2 CMRR 60 dB 3 -5V V- -3V 78 3V V+ 5V 89 Common Mode -2V VCM 2V 2.3 75 65 60 65 60 65 60 2.5 pF dB min dB min dB min V min V max dB min V min V max V min V max mA min mA min mA max Units
5V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25C, V+ = 5V, V- = -5V, VCM = VO = 0V and RL > 1 M. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) LM7121I Limit (Note 6) SR GBW m f (-3 dB) ts tr, tf AD Slew Rate (Note 8) Unity Gain-Bandwidth Phase Margin Bandwidth (Notes 9, 10) Settling Time Rise and Fall Time (Note 10) Differential Gain AV = +2, RL = 1 k, VO = 6 VPP RL = 1 k RL = 1 k RL = 100, AV = +1 RL = 100, AV = +2 5 VPP Step, to 0.1%, RL = 500 AV = +2, RL = 100, VO = 0.4 VPP AV = +2, RL = 150 520 105 74 160 50 65 5.8 0.3 ns ns % V/s MHz Deg MHz Units
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5V AC Electrical Characteristics
Symbol Parameter
(Continued)
Unless otherwise specified, all limits guaranteed for TJ = 25C, V+ = 5V, V- = -5V, VCM = VO = 0V and RL > 1 M. Boldface limits apply at the temperature extremes. Conditions Typ (Note 5) LM7121I Limit (Note 6) D en in T.H.D. Differential Phase Input-Referred Voltage Noise Input-Referred Current Noise Total Harmonic Distortion 2 VPP Output, RL = 150, AV = +2, f = 1 MHz 2 VPP Output, RL = 150, AV = +2, f = 5 MHz 0.1 0.6 % f = 10 kHz 2 AV = +2, RL = 150 f = 10 kHz 0.65 17 Deg Units
+5V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25C, V+ = +5V, V- = 0V, VCM = VO = V+/2 and RL > 1 M. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) LM7121I Limit (Note 6) VOS IB IOS RIN CIN CMRR +PSRR -PSRR VCM Input Offset Voltage Input Bias Current Input Offset Current Input Resistance Input Capacitance Common Mode Rejection Ratio Positive Power Supply Rejection Ratio Negative Power Supply Rejection Ratio Input Common-Mode Voltage Range 1.5 AV VO Large Signal Voltage Gain Output Swing RL = 2 k to V+/2, High RL = 2 k to V+/2, Low RL = 150 to V+/2, High RL = 150 to V+/2, Low Sourcing Sinking 3.7 1.3 3.48 1.59 33 20 4.8 mA mA mA V RL = 2 k to V+/2 64 CMRR 45 dB 3.5 V min V max dB 0V V- 0.4V 61 dB 4.6V V+ 5V 85 dB Common Mode Differential Mode Common Mode 2V VCM 3V 2.4 4 0.04 2.6 3.4 2.3 65 mV A A M M pF dB Units
ISC IS
Output Short Circuit Current Supply Current
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+5V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25C, V+ = +5V, V- = 0V, VCM = VO = V+/2 and RL > 1 M. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 5) LM7121I Limit (Note 6) SR GBW m f (-3 dB) tr, tf T.H.D. Slew Rate (Note 8) Unity Gain-Bandwidth Phase Margin Bandwidth (Notes 9, 10) Rise and Fall Time (Note 10) Total Harmonic Distortion AV = +2, RL = 1 k to V+/2, VO = 1.8 VPP RL = 1k, to V+/2 RL = 1k to V+/2 RL = 100 to V+/2, AV = +1 RL = 100 to V+/2, AV = +2 AV = +2, RL = 100, VO = 0.2 VPP 0.6 VPP Output, RL = 150, AV = +2, f = 1 MHz 0.6 VPP Output, RL = 150, AV = +2, f = 5 MHz 0.067 0.33 % 145 80 70 200 45 8 ns V/s MHz Deg MHz Units
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 k 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 150C. Note 4: The maximum power dissipation is a function of TJ(max), JA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(max)-TA)/JA. 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 510 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 k resistors and 2 pF capacitor from summing node to ground.
Typical Performance Characteristics
Supply Current vs Supply Voltage
TA = 25C, RL = 1 M. unless otherwise specified Input Offset Voltage vs Temperature
Supply Current vs Temperature
DS012348-66 DS012348-67 DS012348-68
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Typical Performance Characteristics
Input Bias Current vs Temperature
TA = 25C, RL = 1 M. unless otherwise specified (Continued)
Input Offset Voltage vs Common Mode Voltage @ VS = 15V
Input Offset Voltage vs Common Mode Voltage @ VS = 5V
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Short Circuit Current vs Temperature (Sourcing)
Short Circuit Current vs Temperature (Sinking)
Output Voltage vs Output Current (ISINK, VS = 15V)
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Output Voltage vs Output Current (ISOURCE, VS = 15V)
Output Voltage vs Output Current (ISOURCE, VS = 5V)
Output Voltage vs Output Current (ISINK, VS = 5V)
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Typical Performance Characteristics
Output Voltage vs Output Current (ISOURCE, VS = +5V)
TA = 25C, RL = 1 M. unless otherwise specified (Continued)
Output Voltage vs Output Current (ISINK, VS = +5V)
CMRR vs Frequency
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PSRR vs Frequency
PSRR vs Frequency
Open Loop Frequency Response
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Open Loop Frequency Response
Open Loop Frequency Response
Unity Gain Frequency vs Supply Voltage
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Typical Performance Characteristics
GBWP @ 10 MHz vs Supply Voltage
TA = 25C, RL = 1 M. unless otherwise specified (Continued) Large Signal Voltage Gain vs Load, VS = 5V
Large Signal Voltage Gain vs Load, VS = 15V
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Input Voltage Noise vs Frequency
Input Current Noise vs Frequency
Input Voltage Noise vs Frequency
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Input Current Noise vs Frequency
Slew Rate vs Supply Voltage
Slew Rate vs Input Voltage
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Typical Performance Characteristics
Slew Rate vs Input Voltage
TA = 25C, RL = 1 M. unless otherwise specified (Continued) Large Signal Pulse Response, AV = -1, VS = 15V
Slew Rate vs Load Capacitance
DS012348-35 DS012348-33 DS012348-34
Large Signal Pulse Response, AV = -1, VS = 5V
Large Signal Pulse Response, AV = -1, VS = +5V
Large Signal Pulse Response, AV = +1, VS = 15V
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Large Signal Pulse Response, AV = +1, VS = 5V
Large Signal Pulse Response, AV = +1, VS = +5V
Large Signal Pulse Response, AV = +2, VS = 15V
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Typical Performance Characteristics
Large Signal Pulse Response, AV = +2, VS = 5V
TA = 25C, RL = 1 M. unless otherwise specified (Continued)
Large Signal Pulse Response, AV = +2, VS = +5V
Small Signal Pulse Response, AV = -1, VS = 15V, RL = 100
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Small Signal Pulse Response, AV = -1, VS = 5V, RL = 100
Small Signal Pulse Response, AV = -1, VS = +5V, RL = 100
Small Signal Pulse Response, AV = +1, VS = 15V, RL = 100
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Small Signal Pulse Response, AV = +1, VS = 5V, RL = 100
Small Signal Pulse Response, AV = +1, VS = +5V, RL = 100
Small Signal Pulse Response, AV = +2, VS = 15V, RL = 100
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Typical Performance Characteristics
Small Signal Pulse Response, AV = +2, VS = 5V, RL = 100
TA = 25C, RL = 1 M. unless otherwise specified (Continued)
Small Signal Pulse Response, AV = +2, VS = +5V, RL = 100
Closed Loop Frequency Response vs Temperature VS = 15V, AV = +1, RL = 100
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Closed Loop Frequency Response vs Temperature VS = 5V, AV = +1, RL = 100
Closed Loop Frequency Response vs Temperature VS = +5V, AV = +1, RL = 100
Closed Loop Frequency Response vs Temperature VS = 15V, AV = +2, RL = 100
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Closed Loop Frequency Response vs Temperature VS = 5V, AV = +2, RL = 100
Closed Loop Frequency Response vs Temperature VS = +5V, AV = +2, RL = 100
Closed Loop Frequency Response vs Capacitive Load (AV = +1, VS = 15V)
DS012348-59
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Typical Performance Characteristics
Closed Loop Frequency Response vs Capacitive Load (AV = +1, VS = 5V)
TA = 25C, RL = 1 M. unless otherwise specified (Continued)
Closed Loop Frequency Response vs Capacitive Load (AV = +2, VS = 15V)
Closed Loop Frequency Response vs Capacitive Load (AV = +2, VS = 5V)
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Total Harmonic Distortion vs Frequency
Total Harmonic Distortion vs Frequency
Total Harmonic Distortion vs Frequency
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Total Harmonic Distortion vs Frequency
Undistorted Output Swing vs Frequency
Undistorted Output Swing vs Frequency
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Typical Performance Characteristics
Undistorted Output Swing vs Frequency
TA = 25C, RL = 1 M. unless otherwise specified (Continued) Total Power Dissipation vs Ambient Temperature
DS012348-86
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Application Information
The table below, depicts the maximum operating supply voltage for each package type: TABLE 1. Maximum Supply Voltage Values SOT23-5 Single Supply Dual Supplies 10V SO-8 30V DIP 30V 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. APPLICATION CIRCUITS Current Boost Circuit The circuit in Figure 2 can be used to achieve good linearity along with high output current capability.
5V
15V
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.
DS012348-92
FIGURE 2. Simple Circuit to Improve Linearity and Output Drive Current By proper choice of R3, the LM7121 output can be set to supply a minimal amount of current, thereby improving its output linearity. R3 can be adjusted to allow for different loads: R3 = 0.1 RL The circuit above has been set for a load of 100. 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).
DS012348-87
FIGURE 1. Typical Circuit for AV = +1 Operation (VS 6V) 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. 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.
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Application Information
(Continued)
DS012348-93
FIGURE 3. Waveform across a 100 Load
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Application Information
(Continued)
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.
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Application Information
(Continued)
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.
DS012348-94
Note: Pin numbers shown are for DIP/SO-8 packages. *Input termination of NTSC monitor.
FIGURE 4. Single Supply Differential Twister Pair Cable Transmitter/Receiver 8.5V VCC 30V 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. Even though the transmission line is not terminated in its nominal characteristic impedance of about 600, the resulting reflection at the load is only about 5% of the total signal and in most cases can be neglected. Using 75 termination instead, has the advantage of operating at a low impedance and results in a higher realizable bandwidth and signal fidelity.
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Application Information
(Continued)
DS012348-95
FIGURE 5. Step Response to a 1 VPP Input Signal Measured across the 75 Load
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(a) AV = -1
CC = 2 pF for RL = 100 CC = Open for RL = Open
(b) AV = +2
DS012348-A0
(c) AV = +2, Capacitive Load
DS012348-A1
RF = 0, CC = Open for VS < 6V RF = 510, CC = 3 pF for VS 6V
(d) AV = +1
DS012348-A2
(e) AV = +1, VS = +5V, Single Supply Operation FIGURE 6. Application Test Circuits
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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
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Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
5-Lead Molded SOT23-5 Order Number LM7121IM5X NS Package Number MA05A
8-Lead (0.300" Wide) Molded Dual-In-Line Package Order Number LM7121IN NS Package Number N08E
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LM7121 235 MHz Tiny Low Power Voltage Feedback Amplifier
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
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 OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.
National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Francais Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80
2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
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National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

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