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| LM6317 120 MHz Fast Settling Low Power Voltage Feedback Amplifier November 1995 LM6317 120 MHz Fast Settling Low Power Voltage Feedback Amplifier General Description The LM6317 is a high speed unity-gain stable voltage feedback amplifier that consumes only 40 mW of quiescent power Operating at g5V power supply the LM6317 provides excellent AC performance such as 120 MHz of unity-gain bandwidth 1500V ms of slew rate and 80 dB of SFDR The LM6317 has the slew characteristic of a current feedback amplifier yet it can be used in all traditional amplifier configurations The high output current and good stability with capacitive load of LM6317 makes it ideal for driving cables With its unity-gain stability fast settling time and low output impedance the LM6317 can be used to buffer A D converters The LM6317 also has very low input voltage and current noise high CMRR and PSRR desirable in precision applications such as ATE systems Features (Typical unless otherwise noted) Y Y Y Y Y Y Y Y Y Y Easy to use voltage feedback topology Unity-gain stability Wide unity-gain bandwidth Fast slew rate Fast settling time 0 1% 0 01% Low SFDR 1 MHz Driving 100X High output current High CMRR and PSRR Low supply current Specified for g5V operation 120 MHz 1100V ms 12 ns 18 ns 80 dB 60 mA 80 dB 74 dB 4 mA Applications Y Y Y Y Y Y Y Active filters A D Converter buffers Video cable drivers Communication systems Portable systems Ultrasound equipment ATE systems Typical Performance Settling Time vs Gain Connection Diagram 8-Pin DIP SO TL H 12542 - 2 Top View TL H 12542 - 14 Ordering Information Temperature Range Package Industrial b 40 C to a 85 C LM6317IN LM6317IM LM6317IMX Transport Media Rails Rails 2 5k Tape and Reel NSC Drawing N08E M08A 8-Pin DIP 8-Pin Small Outline TinyPakTM is a trademark of National Semiconductor Corp C1996 National Semiconductor Corporation TL H 12542 RRD-B30M76 Printed in U S A http www national com 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 Machine Model Supply Voltage (V a - Vb) 1 5 kV 200V Operating Ratings (Note 1) Supply Voltage Junction Temperature Range Thermal Resistance (iJA) N Package 8-Pin Molded DIP M Package 8-Pin Surface Mount g2 3V s VS s g6V b 40 C s TJ s a 85 C 110 C W 170 C W 12V Differentfial Input Voltage 10V g60 mA Output Current (Note 3) b 65 C to a 150 C Storage Temperature Range Maximum Junction Temperature (Note 4) 150 C g5V DC Electrical Characteristics Unless otherwise specified all limits guaranteed for TJ e 25 C V a e a 5V Vb e b5V VCM e 0V and RL e 100X Boldface limits apply at the temperature extremes Symbol VOS TC VOS IB IOS RIN Parameter Input Offset Voltage Input Offset Voltage Average Drift Input Bias Current Input Offset Current Input Resistance Differential Common CIN Input Capacitance Differential Common RO CMRR PSRR AV Open Loop Output Resistance Common Mode Rejection Ratio Power Supply Rejection Ratio Large Signal Voltage Gain VCM e g1 5V VS e g5V to g4 5V VOUT e g1V RL e 1 kX VOUT e g1V RL e 100X VCM Input Common-Mode Voltage Range CMRR e 60 dB Conditions Typ (Note 5) 03 8 3 02 2 1 1 1 0 02 80 74 70 67 32 b3 2 Limit (Note 6) 5 7 Units mV max mV C 12 22 2 4 mA max mA max MX pF X 62 57 60 52 55 50 53 48 26 23 b2 6 b2 3 dB min dB min dB min V min V max http www national com 2 g5V DC Electrical Characteristics (Continued) Unless otherwise specified all limits guaranteed for TJ e 25 C V a e a 5V Vb e b5V VCM e 0V and RL e 100X Boldface limits apply at the temperature extremes Symbol VO Parameter Output Swing Conditions RL e 1 kX Typ (Note 5) 35 b3 5 Limit (Note 6) 3 26 b3 b2 6 Units V min V max V min V max mA max RL e 100X 3 b3 25 23 b2 5 b2 3 IS Supply Current 4 6 7 g5V AC Electrical Characteristics Unless otherwise specified TJ e 25 C V a e a 5V Vb e 5V AV e 1 and RL e 100X Symbol SR Parameter Slew Rate Conditions 5V Step 5V Step AV e b1 RL e 500X Unity-Gain Bandwidth b 3 dB Frequency Typ (Note 5) 1100 750 120 80 60 12 18 42 2 Units V ms MHz MHz AV e b1 RL e 500X AV e a 2 AV e b1 RL e 500X 0 1% 2V Step 0 01% 2V Step im ts Phase Margin Settling Time ns nV 0Hz en in Input-Referred Voltage Noise Input-Referred Current Noise f e 100 kHz f e 100 kHz pA 0Hz 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 kX in series with 100 pF Machine model 200X in series with 100 pF Note 3 Applies to both single-supply and split-supply operation Sourcing and sinking more than 60 mA at the output may adversely affect reliability Note 4 The maximum power dissipation is a function of TJ(max) iJA and TA The maximum allowable power dissipation at any ambient temperature is PD e (TJ(max) -TA) iJA 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 3 http www national com Typical Performance Characteristics Supply Current vs Supply Voltage Unless otherwise noted TA e 25 C VS e g5V PSRR CMRR and Closed Loop Ro IB and IOS vs Common-Mode Voltage TL H 12542-3 TL H 12542 - 4 TL H 12542 - 5 Open Loop Frequency Response Bandwidth vs Supply Voltage Bandwidth vs Capacitive Load TL H 12542 - 7 TL H 12542 - 8 Non-Inverting Frequency Response Inverting Frequency Response Equivalent Input Noise TL H 12542-9 TL H 12542 - 10 TL H 12542 - 11 2nd and 3rd Harmonic Distortion Settling Time vs Capactive Load Maximum Power Dissipation vs Ambient Temperature TL H 12542-12 TL H 12542 - 13 TL H 12542 - 24 http www national com 4 Typical Performance Characteristics Large Signal Pulse Response (AV e a 1) Unless otherwise noted TA e 25 C VS e g5V (Continued) Small Signal Pulse Response (AV e a 1) TL H 12542 - 1 TL H 12542 - 15 Large Signal Pulse Response (AV e b1) Small Signal Pulse Response (AV e b1) TL H 12542 - 16 TL H 12542 - 17 Large Signal Pulse Response (AV e a 2) Small Signal Pulse Response (AV e a 2) TL H 12542 - 18 TL H 12542 - 19 5 http www national com Application Notes Using the LM6317 LIMITS AND PRECAUTIONS The absolute maximum supply voltage which may be applied to the LM6317 is 12V Designers should not design for more than 10V nominal and carefully check supply tolerances under all conditions so that the voltages do not exceed the maximum DIFFERENTIAL INPUT VOLTAGE Differential input voltage is the difference in voltage between the non-inverting ( a ) input and the inverting (b) input of the op amp The absolute maximum differential input for the LM6317 is 10V across the inputs This limit also applies when there is no power supplied to the op amp This may not be a problem in most conventional op amp designs however designers should avoid using the LM6317 as comparators or forcing the inputs to different voltages In some designs diodes protection may be needed between the inputs as shown in Figure 1 COMPONENTS SELECTION AND FEEDBACK RESISTOR It is important in high speed applications to keep all component leads short because wires are inductive at high frequency For discrete components choose carbon composition-type resistors and mica-type capacitors Surface mount components are preferred over decrete components for minimum inductive effect Large values of feedback resistors can couple with parasitic capacitance and cause undersirable effects such as ringing or oscillation in high speed amplifiers Feedback resistor value around 1 kX is recommended COMPENSATION FOR INPUT CAPACITANCE The combination of an amplifier's input capacitance with the gain setting resistors adds a pole that can cause peaking or oscillation To solve this problem a feedback capacitor with a value CF l (RG c CIN) RF can be used to cancel that pole The value of CIN can be found in the DC Electrical Characteristics Table of the datasheet Figure 2 illustrates the compensation circuit TL H 12542-20 FIGURE 1 Input Protection for LM6317 TL H 12542 - 21 Layout Consideration PRINTED CIRCUIT BOARDS AND HIGH SPEED OP AMPS There are many things to consider when designing PC boards for high speed op amps Without proper caution it is very easy and frustrating to have excessive ringing oscillation and other degraded AC performance in high speed circuits As a rule the signal traces should be short and wide to provide low inductance and low impedance paths Any unused board space needs be grounded to reduce stray signal pickup Critical components should also be grounded at a common point to eliminate voltage drop Sockets add capacitance to the board and can affect frequency performance It is better to solder the amplifier directly into the PC board without using any socket USING PROBES Active (FET) probes are ideal for taking high frequency measurements because they have wide bandwidth high input impedance and low input capacitance However the probe ground leads provide a long ground loop that will produce errors in measurement Instead the probes can be grounded directly by removing the ground leads and probe jackets and using scope probe jacks FIGURE 2 Compensating for Input Capacitance Power Supply Bypassing Bypassing the power supply is necessary to maintain low power supply impedance across frequency Both positive and negative power supplies should be bypassed individually by placing 0 01 mF creramic capacitors directly to power supply pins and 2 2 mF tantalum capacitors close to the power supply pins TL H 12542 - 22 FIGURE 3 Power Supply Bypassing http www national com 6 Application Notes (Continued) Termination In high frequency applications reflections occur if signals are not properly terminated To minimize reflection coaxial cable with matching characteristic impedance to the signal source should be used The other end of the cable should be terminated with the same value terminator or resistor For the commonly used cables RG59 has 75X characteristics impedance and RG58 has 50X characteristics impedance Other High Speed and Video Amplifiers National Semiconductor has an extensive line of high speed amplifiers with a range of operating voltage from 3V single supply to g15V and a range of package types such as the space saving SOT23-5 TinyPakTM (3 05mm c 3 00mm c 1 43mm - about the size of a grain of rice) and a wide SO-8 for better power dissipation This op amp line includes LM6171 100 MHz low distortion amplifier with greater than 3000V ms slew rate Voltage feedback design draws only 2 5 mA Specified at g15V and g5V supplies LM7131 TinyPak (SOT23-5) video amplifier with 70 MHz gain bandwidth Specified at 3V 5V and g5V supplies LM7171 200 MHz voltage feedback amplifier with 100 mA output current and 4000V ms slew rate Supply current of 6 5 mA Specified at g15V and g5V supplies Information on these parts is available from your National Semiconductor representative Driving Capacitive Loads Amplifiers driving capacitive loads can oscillate or have ringing at the output To eliminate oscillation or reduce ringing an isolation resistor can be placed as shown below in Figure 4 The combination of the isolation resistor and the load capacitor froms a pole to incease stability by adding more phase margin to the overall system The desired performance depends on the value of the isolation resistor the bigger the isolation resistor the more damped the pulse response becomes A 50X isolation resistor is recommended for initial evaluation TL H 12542 - 23 FIGURE 4 Driving Capacitive Load Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin Small Outline Order Number LM6317IM or LM6317IMX NSC Package Number M08A 7 http www national com LM6317 120 MHz Fast Settling Low Power Voltage Feedback Amplifier Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 8-Pin DIP Order Number LM6317IN NSC Package Number N08E 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 1111 West Bardin Road Arlington TX 76017 Tel 1(800) 272-9959 Fax 1(800) 737-7018 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 http www national com National Semiconductor Europe Fax a49 (0) 180-530 85 86 Email europe support nsc com Deutsch Tel a49 (0) 180-530 85 85 English Tel a49 (0) 180-532 78 32 Fran ais Tel a49 (0) 180-532 93 58 Italiano Tel a49 (0) 180-534 16 80 National Semiconductor Hong Kong Ltd 13th Floor Straight Block Ocean Centre 5 Canton Rd Tsimshatsui Kowloon Hong Kong Tel (852) 2737-1600 Fax (852) 2736-9960 National Semiconductor Japan Ltd Tel 81-043-299-2308 Fax 81-043-299-2408 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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