LMH6639 LMH6639 190MHz Rail-to-Rail Output Amplifier with Disable Literature Number: SNOS989F LMH6639 190MHz Rail-to-Rail Output Amplifier with Disable General Description Features The LMH6639 is a voltage feedback operational amplifier with a rail-to-rail output drive capability of 110mA. Employing National's patented VIP10 process, the LMH6639 delivers a bandwidth of 190MHz at a current consumption of only 3.6mA. An input common mode voltage range extending to 0.2V below the V- and to within 1V of V+, makes the LMH6639 a true single supply op-amp. The output voltage range extends to within 30mV of either supply rail providing the user with a dynamic range that is especially desirable in low voltage applications. The LMH6639 offers a slew rate of 172V/s resulting in a full power bandwidth of approximately 28MHz. The LMH6639 also offers protection for the input transistors by using two antiparallel diodes and a series resistor connected across the inputs. The TON value of 83nsec combined with a settling time of 33nsec makes this device ideally suited for multiplexing applications (see application note for details). Careful attention has been paid to ensure device stability under all operating voltages and modes. The result is a very well behaved frequency response characteristic for any gain setting including +1, and excellent specifications for driving video cables including harmonic distortion of -60dBc, differential gain of 0.12% and differential phase of 0.045 (VS = 5V, Typical values unless specified) 3.6mA Supply current (no load) 400A Supply current (off mode) 0.186 Output resistance (closed loop 1MHz) 190MHz -3dB BW (AV = 1) 33nsec Settling time -0.2V to 4V Input common mode voltage 40mV from rails Output voltage swing 110mA Linear output current -60dBc Total harmonic distortion Fully characterized for 3V, 5V and 5V No output phase reversal with CMVR exceeded Excellent overdrive recovery -70dB Off Isolation 1MHz 0.12% Differential Gain 0.045 Differential Phase Applications Active filters CD/DVD ROM ADC buffer amplifier Portable video Current sense buffer 20030246 FIGURE 1. Typical Single Supply Schematic (c) 2010 National Semiconductor Corporation 200302 www.national.com LMH6639 190MHz Rail-to-Rail Output Amplifier with Disable October 4, 2010 LMH6639 Junction Temperature (Note 4) Soldering Information Infrared or Convection (20 sec) Wave Soldering (10 sec) 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 VIN Differential Input Current Supply Voltage (V+ - V-) Voltage at Input/Output pins Storage Temperature Range 2KV (Note 2) 200V (Note 9) 2.5V 10mA 13.5V V+ +0.8V, V- -0.8V -65C to +150C Operating Ratings +150C 235C 260C (Note 1) Supply Voltage (V+ to V-) Operating Temperature Range (Note 4) 3V to 12V -40C to +85C Package Thermal Resistance (JA) (Note 4) SOT23-6 SOIC-8 265C/W 190C/W 3V Electrical Characteristics Unless otherwise specified, all limits guaranteed for at TJ = 25C, V+ = 3V, V- = 0V, VO = VCM = V+/2, and RL = 2k to V+/2. Boldface limits apply at the temperature extremes. Symbol BW Parameter -3dB BW Conditions AV = +1 Min (Note 6) Typ (Note 5) 120 170 AV = -1 0.1dB Gain Flatness RF = 2.65k , RL = 1k, FPBW Full Power Bandwidth GBW en THD Units MHz 63 BW0.1dB in Max (Note 6) 16.4 MHz AV = +1, VOUT = 2VPP, -1dB V+ = 1.8V, V- = 1.2V 21 MHz Gain Bandwidth product AV = +1 83 MHz Input-Referred Voltage Noise RF = 33k Input-Referred Current Noise Total Harmonic Distortion RF = 1M f = 10kHz 19 f = 1MHz 16 f = 10kHz 1.30 f = 1MHz 0.36 f = 5MHz, VO = 2VPP, AV = +2, RL = 1k to nV/ pA/ -50 dBc V+/2 TS Settling Time VO = 2VPP, 0.1% SR Slew Rate AV = -1 (Note 8) 37 VOS Input Offset Voltage TC VOS Input Offset Average Drift (Note 11) 8 IB Input Bias Current (Note 7) -1.02 -2.6 -3.5 A IOS Input Offset Current 20 800 1000 nA RIN Common Mode Input Resistance AV = +1, f = 1kHz, RS = 1M 6.1 M CIN Common Mode Input Capacitance AV = +1, RS = 100k 1.35 pF CMVR Input Common-Mode Voltage Range CMRR 50dB -0.3 120 1.01 1.8 1.6 2 CMRR Common Mode Rejection Ratio (Note 12) 72 93 AVOL Large Signal Voltage Gain VO = 2VPP, RL = 2k to V+/2 80 76 100 VO = 2VPP, RL = 150 to V+/2 74 70 78 www.national.com 2 ns 167 V/s 5 7 mV V/C -0.2 -0.1 V dB dB VO Parameter Output Swing High Output Swing Low Conditions Min (Note 6) Typ (Note 5) RL = 2k to V+/2, VID = 200mV 2.90 2.98 RL = 150 to V+/2, VID = 200mV 2.75 2.93 RL = 50 to V+/2, VID = 200mV 2.6 2.85 25 75 RL = 150 to 75 200 130 300 V+/2, VID = -200mV Output Short Circuit Current Sourcing to V+/2, (Note 10) 50 35 120 Sinking to V+/2, (Note 10) 67 40 140 IOUT Output Current VO = 0.5V from either supply PSRR Power Supply Rejection Ratio (Note 12) IS Supply Current (Enabled) No Load Units V RL = 2k to V+/2, VID = -200mV RL = 50 to V+/2, VID = -200mV ISC Max (Note 6) mV mA 99 72 Supply Current (Disabled) mA 96 dB 3.5 5.6 7.5 0.3 0.5 0.7 mA TH_SD Threshold Voltage for Shutdown Mode V+-1.59 I_SD PIN Shutdown Pin Input Current -13 A TON On Time After Shutdown 83 nsec TOFF Off Time to Shutdown 160 nsec ROUT Output Resistance Closed Loop RF = 10k, f = 1kHz, AV = -1 27 SD Pin Connect to 0V (Note 7) V m 266 RF = 10k, f = 1MHz, AV = -1 5V Electrical Characteristics Unless otherwise specified, all limits guaranteed for at TJ = 25C, V+ = 5V, V- = 0V, VO = VCM = V+/2, and RL = 2k to V+/2. Boldface limits apply at the temperature extremes. Symbol BW Parameter -3dB BW Conditions AV = +1 Min (Note 6) Typ (Note 5) 130 190 AV = -1 Max (Note 6) Units MHz 64 BW0.1dB 0.1dB Gain Flatness RF = 2.51k, RL = 1k, 16.4 MHz FPBW Full Power Bandwidth AV = +1, VOUT = 2VPP, -1dB 28 MHz GBW Gain Bandwidth Product AV = +1 86 MHz en Input-Referred Voltage Noise in THD Input-Referred Current Noise Total Harmonic Distortion RF = 33k RF = 1M f = 10kHz 19 f = 1MHz 16 f = 10KHz 1.35 f = 1MHz 0.35 f = 5MHz, VO = 2VPP, AV = +2 nV/ pA/ -60 dBc 0.12 % 0.045 deg 33 ns RL = 1k to V+/2 DG Differential Gain NTSC, AV = +2 RL = 150 to DP Differential Phase V+/2 NTSC, AV = +2 RL = 150 to V+/2 TS Settling Time VO = 2VPP, 0.1% SR Slew Rate AV = -1, (Note 8) VOS Input Offset Voltage 130 172 1.02 3 V/s 5 7 mV www.national.com LMH6639 Symbol LMH6639 Symbol Parameter Conditions Min (Note 6) Typ (Note 5) Max (Note 6) Units TC VOS Input Offset Average Drift (Note 11) 8 IB Input Bias Current (Note 7) -1.2 -2.6 -3.25 A IOS Input Offset Current 20 800 1000 nA RIN Common Mode Input Resistance AV = +1, f = 1kHz, RS = 1M 6.88 M CIN Common Mode Input Capacitance AV = +1, RS = 100k 1.32 pF CMVR Common-Mode Input Voltage Range CMRR 50dB -0.3 -0.2 -0.1 4 3.8 3.6 CMRR Common Mode Rejection Ratio (Note 12) 72 95 AVOL Large Signal Voltage Gain 86 82 100 74 70 77 RL = 2k to V+/2, VID = 200mV 4.90 4.97 RL = 150 to 4.65 4.90 4.40 4.77 VO = 4VPP RL = 2k to V+/2 VO = 3.75VPP RL = 150 to V+/2 VO Output Swing High RL = 50 to Output Swing Low Output Short Circuit Current V+/2, VID = 200mV VID = 200mV dB V 25 100 RL = 150 to V+/2, VID = -200mV 85 200 190 400 V+/2, VID = -200mV Sourcing to V+/2, (Note 10) 100 79 160 Sinking from V+/2, (Note 10) 120 85 190 IOUT Output Current VO = 0.5V from either supply PSRR Power Supply Rejection Ratio (Note 12) IS Supply Current (Enabled) No Load 72 Supply Current (Disabled) TH_SD Threshold Voltage for Shutdown Mode I_SD PIN Shutdown Pin Input Current TON TOFF ROUT Output Resistance Closed Loop RF = 10k, f = 1kHz, AV = -1 V dB RL = 2k to V+/2, VID = -200mV RL = 50 to ISC V+/2, V/C mV mA 110 mA 96 dB 3.6 5.8 8.0 0.40 0.8 1.0 mA V+ -1.65 V -30 A On Time after Shutdown 83 nsec Off Time to Shutdown 160 nsec SD Pin Connected to 0V (Note 7) RF = 10k, f = 1MHz, AV = -1 www.national.com 4 29 253 m LMH6639 5V Electrical Characteristics Unless otherwise specified, all limits guaranteed for at TJ = 25C, VSUPPLY = 5V, VO = VCM = GND, and RL = 2k to V+/2. Boldface limits apply at the temperature extremes. Symbol BW Parameter -3dB BW Conditions AV = +1 Min (Note 6) Typ (Note 5) 150 228 AV = -1 65 Max (Note 6) Units MHz BW0.1dB 0.1dB Gain Flatness RF = 2.26k, RL = 1k 18 MHz FPBW Full Power Bandwidth AV = +1, VOUT = 2VPP, -1dB 29 MHz GBW Gain Bandwidth Product AV = +1 90 MHz en Input-Referred Voltage Noise RF = 33k in THD Input-Referred Current Noise Total Harmonic Distortion RF = 1M f = 10kHz 19 f = 1MHz 16 f = 10kHz 1.13 f = 1MHz 0.34 f = 5MHz, VO = 2VPP, AV = +2, nV/ pA/ -71.2 dBc 0.11 % 0.053 deg 33 ns RL = 1k DG Differential Gain NTSC, AV = +2 RL = 150 DP Differential Phase NTSC, AV = +2 TS Settling Time VO = 2VPP, 0.1% SR Slew Rate AV = -1 (Note 8) VOS Input Offset Voltage TC VOS Input Offset Voltage Drift (Note 11) 8 IB Input Bias Current (Note 7) -1.40 -2.6 -3.25 A IOS Input Offset Current 20 800 1000 nA RIN Common Mode Input Resistance AV +1, f = 1kHz, RS = 1M 7.5 M CIN Common Mode Input Capacitance AV = +1, RS = 100k 1.28 pF CMVR Common Mode Input Voltage Range CMRR 50dB -5.3 RL = 150 140 200 1.03 3.8 3.6 Common Mode Rejection Ratio (Note 12) 72 95 AVOL Large Signal Voltage Gain VO = 9VPP, RL = 2k 88 84 100 VO = 8VPP, RL = 150 74 70 77 RL = 2k, VID = 200mV 4.85 4.96 RL = 150, VID = 200mV 4.55 4.80 RL = 50, VID = 200mV 3.60 4.55 Output Swing High Output Swing Low -5.2 -5.1 V dB dB V RL = 2k, VID = -200mV -4.97 -4.90 RL = 150, VID = -200mV -4.85 -4.55 RL = 50, VID = -200mV -4.65 -4.30 5 mV V/C 4.0 CMRR VO V/s 5 7 V www.national.com LMH6639 Symbol ISC Parameter Output Short Circuit Current Conditions Min (Note 6) Typ (Note 5) Sourcing to Ground, (Note 10) 100 80 168 Sinking to Ground, (Note 10) 110 85 190 IOUT Output Current VO = 0.5V from either supply PSRR Power Supply Rejection Ratio (Note 12) IS Supply Current (Enabled) No Load 72 Supply Current (Disabled) TH_SD Threshold Voltage for Shutdown Mode I_SD PIN Shutdown Pin Input Current TON TOFF ROUT Output Resistance Closed Loop RF = 10k, f = 1kHz, AV = -1 Max (Note 6) Units mA 112 mA 96 dB 4.18 6.5 8.5 0.758 1.0 1.3 mA V+ - 1.67 V -84 A On Time after Shutdown 83 nsec Off Time to Shutdown 160 nsec SD Pin Connected to -5V (Note 7) RF = 10k, f = 1MHz, AV = -1 32 m 226 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, 1.5k in series with 100pF. 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 onto 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: Positive current corresponds to current flowing into the device. Note 8: Slew rate is the average of the rising and falling slew rates. Note 9: Machine Model, 0 in series with 200pF. Note 10: Short circuit test is a momentary test. Note 11: Offset voltage average drift determined by dividing the change in VOS at temperature extremes into the total temperature change. Note 12: f 1kHz (see typical performance Characteristics) Connection Diagrams SOT23-6 SOIC-8 20030202 20030201 Top View Top View www.national.com 6 Package Part Number Package Marking Transport Media NSC Drawing 6-Pin SOT-23 LMH6639MF A81A 1k Units Tape and Reel MF06A LMH6639MFX 8-Pin SOIC LMH6639MA 3k Units Tape and Reel LMH6639MA LMH6639MAX Rails M08A 2.5k Units Tape and Reel 7 www.national.com LMH6639 Ordering Information LMH6639 Typical Performance Characteristics At TJ = 25C, V+ = +2.5, V- = -2.5V, RF = 330 for AV = +2, RF = 1k for AV = -1. Unless otherwise specified. Output Sinking Saturation Voltage vs. IOUT for Various Temperature Output Sourcing Saturation Voltage vs. IOUT for Various Temperature 20030237 20030239 Positive Output Saturation Voltage vs. VSUPPLY for Various Temperature Negative Output Saturation Voltage vs. VSUPPLY for Various Temperature 20030234 20030233 VOUT from V+ vs. ISOURCE VOUT from V- vs. ISINK 20030238 www.national.com 20030236 8 LMH6639 IOS vs. VS for Various Temperature VOS vs. VS for 3 Representative Units 20030232 20030245 VOS vs. VS for 3 Representative Units VOS vs. VS for 3 Representative Units 20030244 20030243 VOS vs. VS for 3 Representative Units ISUPPLY vs. VCM for Various Temperature 20030242 20030240 9 www.national.com LMH6639 ISUPPLY vs. VS for Various Temperature IB vs. VS for Various Temperature 20030241 20030235 Bandwidth for Various VS Bandwidth for Various VS 20030206 20030205 Gain vs. Frequency Normalized Gain vs. Frequency Normalized 20030207 www.national.com 20030208 10 LMH6639 0.1dB Gain Flatness Gain and phase vs. Frequency for Various Temperature 20030209 20030204 Frequency Response vs. Temperature Harmonic Distortion 20030210 20030269 Differential Gain/Phase On-Off Switching DC Voltage 20030211 20030270 11 www.national.com LMH6639 On-Off Switching 10MHz Slew Rate (Positive) 20030212 20030214 Slew Rate (Negative) On-Off Switching of Sinewave 20030213 20030215 Power Sweep CMRR vs. Frequency 20030216 www.national.com 20030218 12 LMH6639 PSRR vs. Frequency Current Noise 20030217 20030220 Voltage Noise Closed Loop Output Resistance vs. Frequency 20030221 20030219 Off Isolation Small Signal Pulse Response (AV = +1, RL = 2k ) 20030250 20030222 13 www.national.com LMH6639 Small Signal Pulse Response (AV = -1) Large Signal Pulse Response (RL = 2k) 20030226 20030249 Large Signal Pulse Response Large Signal Pulse Response 20030227 www.national.com 20030228 14 INPUT AND OUTPUT TOPOLOGY All input / output pins are protected against excessive voltages by ESD diodes connected to V+ and V- rails (see Figure 2). These diodes start conducting when the input / output pin voltage approaches 1V be beyond V+ or V- to protect against over voltage. These diodes are normally reverse biased. Further protection of the inputs is provided by the two resistors (R in Figure 2), in conjunction with the string of anti-parallel diodes connected between both bases of the input stage. The combination of these resistors and diodes reduces excessive differential input voltages approaching 2Vbe. The most common situation when this occurs is when the device is put in shutdown and the LMH6639's inputs no longer follow each other. In such a case, the diodes may conduct. As a consequence, input current increases, and a portion of signal may appear at the Hi-Z output. Another possible situation for the conduction of these diodes is when the LMH6639 is used as a comparator (or with little or no feedback). In either case, it is important to make sure that the subsequent current flow through the device input pins does not violate the Absolute Maximum Ratings of the device. To limit the current through the protection circuit extra series resistors can be placed. Together with the build in series resistors of several hundred ohms this extra resistors can limit the input current to a safe number depending on the used application. Be aware of the effect that extra series resistors may impact the switching speed of the device. A special situation occurs when the part is configured for a gain of +1, which means the output is directly connected to the inverting input, see Figure 3. When the part is now placed in shutdown mode the output comes in a high impedance state and is unable to keep the inverting input at the same level as the non-inverting input. In many applications the output is connected to the ground via a low impedance resistor. When this situation occurs and there is a DC voltage offset of more than 2 volt between the non-inverting input and the output, current flows from the non-inverting input through the series resistors R via the bypass diodes to the output. Now the input current becomes much bigger than expected and in many cases the source at the input cannot deliver this current and will drop down. Be sure in this situation that no DC current path is available from the non-inverting input to the output pin, or from the output pin to the load re- 20030274 FIGURE 2. Input Topology 20030275 FIGURE 3. DC path while in shutdown MULTIPLEXING 5 AND 10MHz The LMH6639 may be used to implement a circuit which multiplexes two signals of different frequencies. Three LMH6639 high speed op-amps are used in the circuit of Figure 4 to accomplish the multiplexing function. Two LMH6639 are used to provide gain for the input signals, and the third device is used to provide output gain for the selected signal. 15 www.national.com LMH6639 sistor. This DC path is drawn by a curved line and can be broken by placing one of the capacitors CIN or C OUT or both, depending on the used application. Application Notes LMH6639 20030247 Note: Pin numbers pertain to SOIC-8 package FIGURE 4. Multiplexer Multiplexing signals "FREQ 1" and "FREQ 2" exhibit closed loop non-inverting gain of +2 each based upon identical 330 resistors in the gain setting positions of IC1 and IC2. The two multiplexing signals are combined at the input of IC3, which is the third LMH6639. This amplifier may be used as a unity gain buffer or may be used to set a particular gain for the circuit. The lower trace shows the output waveform consisting of 5MHz and 10MHz signals corresponding to the high or low state of the switching signal. In the circuit of Figure 4, the outputs of IC1 and IC2 are tied together such that their output impedances are placed in parallel at the input of IC3. The output impedance of the disabled amplifier is high compared both to the output impedance of the active amplifier and the 330 gain setting resistors. The closed loop output resistance for the LMH6639 is around 0.2. Thus the active state amplifier output impedance dominates the input node to IC3, while the disabled amplifier is assured of a high level of suppression of unwanted signals which might be present at the output. SHUTDOWN OPERATION With SD pin left floating, the device enters normal operation. However, since the SD pin has high input impedance, it is best tied to V+ for normal operation. This will avoid inadvertent shutdown due to capacitive pick-up from nearby nodes. LMH6639 will typically go into shutdown when SD pin is more than 1.7V below V+, regardless of operating supplies. The SD pin can be driven by push-pull or open collector (open drain) output logic. Because the LMH6639's shutdown is referenced to V+, interfacing to the shutdown logic is rather simple, for both single and dual supply operation, with either form of logic used. Typical configurations are shown in Figure 6 and Figure 7 below for push-pull output: 20030248 FIGURE 5. Switching between 5 and 10MHz 1k resistors are used to set an inverting gain of -1 for IC3 in the circuit of Figure 4. Figure 5 illustrates the waveforms produced. The upper trace shows the switching waveform used to switch between the 5MHz and 10MHz multiplex signals. www.national.com 16 PCB LAYOUT CONSIDERATION AND COMPONENTS SELECTION Care should be taken while placing components on a PCB. All standard rules should be followed especially the ones for high frequency and/ or high gain designs. Input and output pins should be separated to reduce cross-talk, especially under high gain conditions. A groundplane will be helpful to avoid oscillations. In addition, a ground plane can be used to create micro-strip transmission lines for matching purposes. Power supply, as well as shutdown pin de-coupling will reduce cross-talk and chances of oscillations. Another important parameter in working with high speed amplifiers is the component values selection. Choosing high value resistances reduces the cut-off frequency because of the influence of parasitic capacitances. On the other hand choosing the resistor values too low could "load down" the nodes and will contribute to higher overall power dissipation. Keeping resistor values at several hundreds of ohms up to several k will offer good performance. National Semiconductor suggests the following evaluation boards as a guide for high frequency layout and as an aid in device testing and characterization: 20030271 FIGURE 6. Shutdown Interface (Single Supply) Device Package LMH6639MA LMH6639MF 8-Pin SOIC SOT23-6 Evaluation Board PN CLC730027 CLC730116 20030272 These free evaluation boards are shipped when a device sample request is placed with National Semiconductor. For normal operation, tie the SD pin to V+. FIGURE 7. Shutdown Interface (Dual Supplies) Common voltages for logic gates are +5V or +3V. To ensure proper power on/off with these supplies, the logic should be able to swing to 3.4V and 1.4V minimum, respectively. LMH6639's shutdown pin can also be easily controlled in applications where the analog and digital sections are operated at different supplies. Figure 8 shows a configuration where a logic output, SD, can turn the LMH6639 on and off, independent of what supplies are used for the analog and the digital sections: 20030273 FIGURE 8. Shutdown Interface (Single Supply, Open Collector Logic) 17 www.national.com LMH6639 The LMH6639 has an internal pull-up resistor on SD such that if left un-connected, the device will be in normal operation. Therefore, no pull-up resistor is needed on this pin. Another common application is where the transistor in Figure 8 above, would be internal to an open collector (open drain) logic gate; the basic connections will remain the same as shown. LMH6639 Physical Dimensions inches (millimeters) unless otherwise noted 6-Pin SOT23 NS Package Number MF06A 8-Pin SOIC NS Package Number M08A www.national.com 18 LMH6639 Notes 19 www.national.com LMH6639 190MHz Rail-to-Rail Output Amplifier with Disable 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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