LM7301 LM7301 Low Power, 4 MHz GBW, Rail-to-Rail Input-Output Operational Amplifier in TinyPak Package Literature Number: SNOS879G LM7301 Low Power, 4 MHz GBW, Rail-to-Rail Input-Output Operational Amplifier in TinyPakTM Package General Description Features The LM7301 provides high performance in a wide range of applications. The LM7301 offers greater than rail-to-rail input range, full rail-to-rail output swing, large capacitive load driving ability and low distortion. With only 0.6 mA supply current, the 4 MHz gain-bandwidth of this device supports new portable applications where higher power devices unacceptably drain battery life. The LM7301 can be driven by voltages that exceed both power supply rails, thus eliminating concerns over exceeding the common-mode voltage range. The rail-to-rail output swing capability provides the maximum possible dynamic range at the output. This is particularly important when operating on low supply voltages. Operating on supplies of 1.8V-32V, the LM7301 is excellent for a very wide range of applications in low power systems. Placing the amplifier right at the signal source reduces board size and simplifies signal routing. The LM7301 fits easily on low profile PCMCIA cards. at VS = 5V (Typ unless otherwise noted) Tiny 5-pin SOT23 package saves space Greater than Rail-to-Rail Input CMVR -0.25V to 5.25V Rail-to-Rail Output Swing 0.07V to 4.93V Wide Gain-Bandwidth 4 MHz Low Supply Current 0.60 mA Wide Supply Range 1.8V to 32V High PSRR 104 dB High CMRR 93 dB Excellent Gain 97 dB Applications Portable instrumentation Signal conditioning amplifiers/ADC buffers Active filters Modems PCMCIA cards Connection Diagrams 8-Pin SOIC 5-Pin SOT23 1284201 1284202 Top View Top View Gain and Phase Gain and Phase, 2.7V Supply 1284222 1284223 TinyPakTM is a trademark of National Semiconductor Corporation. (c) 2011 National Semiconductor Corporation 12842 www.national.com LM7301 Low Power, 4 MHz GBW, Rail-to-Rail Input-Output Operational Amplifier in TinyPak Package March 23, 2011 LM7301 See Product Folder at www.national.com and http:// www.national.com/ms/MS/MS-SOLDERING.pdf Storage Temperature Range -65C to +150C Junction Temperature (Note 4) 150C 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) Human Body Model Differential Input Voltage Voltage at Input/Output Pin Supply Voltage (V+ - V-) Current at Input Pin Current at Output Pin (Note 3) Current at Power Supply Pin Soldering Information: Operating Ratings 2500V 15V (V+) + 0.3V, (V-) -0.3V 35V 10 mA 20 mA 25 mA 5.0V DC Electrical Characteristics (Note 1) 1.8V VS 32V Supply Voltage Operating Temperature Range (Note 4) -40C to +85C Package Thermal Resistance (JA) (Note 4) 5-Pin SOT23 8-Pin SOIC 325C/W 165C/W (Note 7) Unless otherwise specified, all limits guaranteed for TA = 25C, V+ = 5V, V- = 0V, VCM = VO = V+/2 and RL > 1M to V+/2. Boldface limits apply at the temperature extremes. LM7301 Symbol Parameter VOS Input Offset Voltage TCVOS Input Offset Voltage Average Drift IB Input Bias Current Conditions Input Offset Current Limit (Note 6) Units 0.03 6 8 mV max V/C 2 VCM = 0V VCM = 5V IOS Typ (Note 5) VCM = 0V 90 -40 0.7 200 nA 250 max -75 nA -85 min 70 nA max 80 VCM = 5V 0.7 55 65 RIN Input Resistance, CM 0V VCM 5V 39 CMRR Common Mode Rejection Ratio 0V VCM 5V 88 M 70 67 0V VCM 3.5V 93 PSRR Power Supply Rejection Ratio 2.2V V+ 30V 104 VCM Input Common-Mode Voltage Range CMRR 65 dB 5.1 AV Large Signal Voltage Gain RL = 10 k VO Output Swing dB min 87 84 V -0.1 14 V/mV 10 min 0.07 0.12 V VO = 4.0VPP RL = 10 k RL = 2 k 0.15 max 4.93 4.88 4.85 V min 0.14 0.20 V 0.22 max 4.80 4.78 V min 4.87 www.national.com 2 V 71 ISC Parameter Conditions Output Short Circuit Current Sourcing Sinking IS Supply Current AC Electrical Characteristics Units Typ (Note 5) Limit (Note 6) 11.0 8.0 mA 5.5 min 9.5 6.0 5.0 mA min 0.60 1.10 1.24 mA max (Note 7) TA = 25C, V+ = 2.2V to 30V, V- = 0V, VCM = VO = V+/2 and RL > 1M to V+/2 Symbol SR Parameter Slew Rate Conditions 4V Step @ VS 6V Typ (Note 5) 1.25 V/s MHz GBW Gain-Bandwidth Product f = 100 kHz, RL = 10 k 4 en Input-Referred Voltage Noise f = 1 kHz 36 in Input-Referred Current Noise f = 1 kHz 0.24 T.H.D. Total Harmonic Distortion f = 10 kHz 0.006 3 Units % www.national.com LM7301 LM7301 Symbol LM7301 2.2V DC Electrical Characteristics (Note 7) Unless otherwise specified, all limits guaranteed for TA = 25C, V+ = 2.2V, V- = 0V, VCM = VO = V+/2 and RL > 1M to V+/2. Boldface limits apply at the temperature extremes. LM7301 Symbol Parameter VOS Input Offset Voltage TCVOS Input Offset Voltage Average Drift IB Input Bias Current Conditions Input Offset Current Limit (Note 6) 0.04 6 8 VCM = 0V 89 VCM = 0V -35 0.8 0.4 mV max 200 nA 250 max -75 nA -85 min 70 nA max 80 VCM = 2.2V Units V/C 2 VCM = 2.2V IOS Typ (Note 5) 55 65 RIN Input Resistance 0V VCM 2.2V 18 CMRR Common Mode Rejection Ratio 0V VCM 2.2V 82 PSRR Power Supply Rejection Ratio 2.2V 104 VCM Input Common-Mode Voltage Range CMRR > 60 dB AV Large Signal Voltage Gain RL = 10 k VO Output Swing M 60 56 V+ 30V dB min 87 84 2.3 V -0.1 6.5 V/mV 5.4 min 0.05 0.08 V VO = 1.6VPP RL = 10 k RL = 2 k ISC Output Short Circuit Current Sourcing Sinking IS www.national.com Supply Current 4 V 46 0.10 max 2.15 2.10 2.00 V min 0.09 0.13 V 0.14 max 2.10 2.07 2.00 V min 10.9 8.0 mA 5.5 min 7.7 6.0 5.0 mA min 0.57 0.97 mA 1.24 max LM7301 30V DC Electrical Characteristics (Note 7) Unless otherwise specified, all limits guaranteed for TA = 25C, V+ = 30V, V- = 0V, VCM = VO = V+/2 and RL > 1M to V+/2. Boldface limits apply at the temperature extremes. LM7301 Symbol Parameter VOS Input Offset Voltage TCVOS Input Offset Voltage Average Drift IB Input Bias Current Conditions Input Offset Current Limit (Note 6) Units 0.04 6 8 mV max V/C 2 VCM = 0V 103 VCM = 30V IOS Typ (Note 5) VCM = 0V -50 1.2 VCM = 30V 0.5 RIN Input Resistance 0V VCM 30V 200 CMRR Common Mode Rejection Ratio 0V VCM 30V 104 0V VCM 27V 115 104 300 nA 500 max -100 nA -200 min 90 nA 190 max 65 nA 135 max M 80 78 dB min 90 88 PSRR Power Supply Rejection Ratio 2.2V VCM Input Common-Mode Voltage Range CMRR > 80 dB AV Large Signal Voltage Gain RL = 10 k VO Output Swing V+ 30V 87 84 30.1 V -0.1 30 20 min 0.16 0.275 V max VO = 28VPP RL = 10 k V 105 V/mV 0.375 ISC Output Short Circuit Current Sourcing 29.8 29.75 28.65 V min 11.7 8.8 mA (Note 4) Sinking (Note 4) IS Supply Current 6.5 min 11.5 8.2 6.0 mA min 0.72 1.30 mA 1.35 max 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, applicable std. MIL-STD-883, Method 3015.7. 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 as determined at the time of characterization. Actual typical values may vary over time and will also depend on the application and configuration. The typical values are not tested and are not guaranteed on shipped production material. Note 6: All limits are guaranteed by testing or statistical analysis. Note 7: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of the devices such that TJ = TA. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where TJ > TA. 5 www.national.com LM7301 Typical Performance Characteristics TA = 25C, RL = 1 M unless otherwise specified Supply Current vs. Supply Voltage VOS vs. Supply Voltage 1284203 1284204 VOS vs. VCM VS = 1.1V VOS vs. VCM VS = 2.5V 1284205 1284206 VOS vs. VCM VS = 15V Inverting Input Bias Current vs. Common Mode Voltage VS = 1.1V 1284208 1284207 www.national.com 6 Inverting Input Bias Current vs. Common Mode Voltage VS = 2.5V 1284210 1284209 Non-Inverting Input Bias Current vs. Common Mode Voltage VS = 2.5V Non-Inverting Input Bias Current vs. Common Mode Voltage VS = 15V 1284211 1284212 Inverting Input Bias Current vs. Common Mode Voltage VS = 15V VO vs. IO VS = 1.1V 1284213 1284224 7 www.national.com LM7301 Non-Inverting Input Bias Current vs. Common Mode Voltage VS = 1.1V LM7301 VO vs. IO VS = 2.5V Short Circuit Current vs. Supply Voltage 1284226 1284225 Voltage Noise vs. Frequency Current Noise vs. Frequency 1284215 1284214 Gain and Phase Gain and Phase, 2.7V Supply 1284222 www.national.com 1284223 8 LM7301 Applications Information GENERAL INFORMATION Low supply current, wide bandwidth, input common mode voltage range that includes both rails, "rail-to-rail" output, good capacitive load driving ability, wide supply voltage (1.8V to 32V) and low distortion all make the LM7301 ideal for many diverse applications. The high common-mode rejection ratio and full rail-to-rail input range provides precision performance when operated in non-inverting applications where the common-mode error is added directly to the other system errors. 1284218 FIGURE 3. CAPACITIVE LOAD DRIVING The LM7301 has the ability to drive large capacitive loads. For example, 1000 pF only reduces the phase margin to about 25 degrees. TRANSIENT RESPONSE The LM7301 offers a very clean, well-behaved transient response. Figures 1, 2, 3, 4, 5, 6 show the response when operated at gains of +1 and -1 when handling both small and large signals. The large phase margin, typically 70 to 80 degrees, assures clean and symmetrical response. In the large signal scope photos, Figure 1 and Figure 4, the input signal is set to 4.8V. Note that the output goes to within 100 mV of the supplies cleanly and without overshoot. In the small signal samples, the response is clean, with only slight overshoot when used as a follower. Figure 3 and Figure 6 are the circuits used to make these photos. 1284219 FIGURE 4. 1284220 FIGURE 5. 1284216 FIGURE 1. 1284221 FIGURE 6. 1284217 FIGURE 2. 9 www.national.com LM7301 STABILITY CONSIDERATIONS Rail-to-rail output amplifiers like the LM7301 use the collector of the drive transistor(s) at the output pin, as shown in Figure 7. This allows the load to be driven as close as possible towards either supply rail. 1284229 FIGURE 8. Non-dissipating Snubber Network to Reduce Gain Peaking The non-dissipating snubber, consisting of Rc and Cc, acts as AC load to reduce high frequency gain peaking with no DC loading so that total power dissipation is not increased. The increased AC load effectively reduces loop gain at higher frequencies thereby reducing gain peaking due to the possible causes stated above. For the particular set of Rc and Cc values shown in Figure 8, loop gain peaking is reduced by about 25dB under worst case peaking conditions (I_source= 2mA DC @ around 180MHz) thus confining loop gain below 0dB and eliminating any possible instability. For best results, it may be necessary to "tune" the values of Rc and Cc in a particular application to take into account other subtleties and tolerances. 1284230 FIGURE 7. Simplified Output Stage Block Diagram While this architecture maximizes the load voltage swing range, it increases the dependence of loop gain and subsequently stability, on load impedance and DC load current, compared to a non-rail-to-rail architecture. Thus, with this type of output stage, it is even more crucial to ensure stability by meticulous bench verification under all load conditions, and to apply the necessary compensation or circuit modifications to overcome any instability, if necessary. Any such bench verification should also include temperature, supply voltage, input common mode and output bias point variations as well as capacitive loading. For example, one set of conditions for which stability of the LM7301 amplifier may be compromised is when the DC output load is larger than +/-0.5 mA, with input and output biased to mid-rail. Under such conditions, it may be possible to observe open-loop gain response peaking at a high frequency (e.g. 200 MHz), which is beyond the expected frequency range of the LM7301 (4 MHz GBW). Without taking any precautions against gain peaking, it is possible to see increased settling time or even oscillations, especially with low closed loop gain and / or light AC loading. It is possible to reduce or eliminate this gain peaking by using external compensation components. One possible scheme that can be applied to reduce or eliminate this gain peaking is shown in Figure 8. www.national.com POWER DISSIPATION Although the LM7301 has internal output current limiting, shorting the output to ground when operating on a +30V power supply will cause the op amp to dissipate about 350 mW. This is a worst-case example. In the 8-pin SOIC package, this will cause a temperature rise of 58C. In the 5-pin SOT23 package, the higher thermal resistance will cause a calculated rise of 113C. This can raise the junction temperature to above the absolute maximum temperature of 150C. Operating from split supplies greatly reduces the power dissipated when the output is shorted. Operating on 15V supplies can only cause a temperature rise of 29C in the 8-pin SOIC and 57C in the 5-pin SOT23 package, assuming the short is to ground. SPICE MACROMODEL A SPICE macromodel for this and many other National Semiconductor operational amplifiers is available, at no charge, from the NSC Customer Support Center at 800-272-9959 or on the World Wide Web at http://www.national.com/models. WIDE SUPPLY RANGE The high power-supply rejection ratio (PSRR) and commonmode rejection ratio (CMRR) provide precision performance when operated on battery or other unregulated supplies. This advantage is further enhanced by the very wide supply range (2.2V-30V, guaranteed) offered by the LM7301. In situations where highly variable or unregulated supplies are present, the excellent PSRR and wide supply range of the LM7301 benefit the system designer with continued precision performance, even in such adverse supply conditions. 10 Typical Applications HANDHELD REMOTE CONTROLS The LM7301 offers outstanding specifications for applications requiring good speed/power trade-off. In applications such as remote control operation, where high bandwidth and low power consumption are needed. The LM7301 performance can easily meet these requirements. OPTICAL LINE ISOLATION FOR MODEMS The combination of the low distortion and good load driving capabilities of the LM7301 make it an excellent choice for driving opto-coupler circuits to achieve line isolation for modems. This technique prevents telephone line noise from coupling onto the modem signal. Superior isolation is achieved by coupling the signal optically from the computer modem to the telephone lines; however, this also requires a low distortion at relatively high currents. Due to its low distortion at high output drive currents, the LM7301 fulfills this need, in this and in other telecom applications. Please refer to STABILITY CONSIDERATIONS for methods used to ensure stability under all load conditions. REMOTE MICROPHONE IN PERSONAL COMPUTERS Remote microphones in Personal Computers often utilize a microphone at the top of the monitor which must drive a long cable in a high noise environment. One method often used to reduce the nose is to lower the signal impedance, which reduces the noise pickup. In this configuration, the amplifier usually requires 30 db-40 db of gain, at bandwidths higher than most low-power CMOS parts can achieve. The LM7301 offers the tiny package, higher bandwidths, and greater output drive capability than other rail-to-rail input/output parts can provide for this application. LOW DISTORTION, HIGH OUTPUT DRIVE CAPABILITY The LM7301 offers superior low-distortion performance, with a total-harmonic-distortion-plus-noise of 0.06% at f = 10 kHz. The advantage offered by the LM7301 is its low distortion Ordering Information Package 8-Pin SOIC 5-Pin SOT23 Part Number LM7301IM LM7301IMX LM7301IM5 LM7301IM5X Package Marking LM7301IM A04A 11 Transport Media 95 Units/Rail 2.5k Units Tape and Reel 1k Units Tape and Reel 3k Units Tape and Reel NSC Drawing M08A MF05A www.national.com LM7301 levels, even at high output current and low load resistance. Please refer to STABILITY CONSIDERATIONS for methods used to ensure stability under all load conditions. SPECIFIC ADVANTAGES OF 5-Pin SOT23 (TinyPak) The obvious advantage of the 5-pin SOT23, TinyPak, is that it can save board space, a critical aspect of any portable or miniaturized system design. The need to decrease overall system size is inherent in any handheld, portable, or lightweight system application. Furthermore, the low profile can help in height limited designs, such as consumer hand-held remote controls, sub-notebook computers, and PCMCIA cards. An additional advantage of the tiny package is that it allows better system performance due to ease of package placement. Because the tiny package is so small, it can fit on the board right where the op amp needs to be placed for optimal performance, unconstrained by the usual space limitations. This optimal placement of the tiny package allows for many system enhancements, not easily achieved with the constraints of a larger package. For example, problems such as system noise due to undesired pickup of digital signals can be easily reduced or mitigated. This pick-up problem is often caused by long wires in the board layout going to or from an op amp. By placing the tiny package closer to the signal source and allowing the LM7301 output to drive the long wire, the signal becomes less sensitive to such pick-up. An overall reduction of system noise results. Often times system designers try to save space by using dual or quad op amps in their board layouts. This causes a complicated board layout due to the requirement of routing several signals to and from the same place on the board. Using the tiny op amp eliminates this problem. Additional space savings parts are available in tiny packages from National Semiconductor, including low power amplifiers, precision voltage references, and voltage regulators. LM7301 Physical Dimensions inches (millimeters) unless otherwise noted 5-Pin SOT23 Package NS Package Number MF05A 8-Pin SOIC NS Package Number M08A www.national.com 12 LM7301 Notes 13 www.national.com LM7301 Low Power, 4 MHz GBW, Rail-to-Rail Input-Output Operational Amplifier in TinyPak Package Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH(R) 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 www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise(R) Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagicTM www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise(R) Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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