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LM6311 Low Noise High Speed Voltage Feedback Operational Amplifier Literature Number: SNOS790A
LM6311 Low Noise High Speed Voltage Feedback Operational Amplifier November 1995 LM6311 Low Noise High Speed Voltage Feedback Operational Amplifier General Description The LM6311 is a low noise voltage feedback operational amplifier with low distortion. This makes the LM6311 ideal for signal recovery, high quality video, audio and medical imaging. The conventional voltage fedback design makes it easy to use in standard active filter circuits. The low distortion makes the LM6311 a good choice for driving high resolution analog-to-digital converters. The 50 mA current drive and good capacitive load tolerance make the LM6311 useful for driving analog-to-digital con- verters which have switched-capacitor type inputs. The LM6311 provides low noise and high speed for a5V single supply designs, making it useful for desktop systems and portable designs.
Features
Y 2.3 nV/root-Hertz voltage noise Y 3.5 pA/root-Hertz current noise Y 50 mA output current Y 200V/ms slew rate Y Low distortion b60 dB @ 5 MHz Y Pin for external compensation Y Dual g5V or single a5V or a12V supplies Y Guaranteed specs at a5V
Applications
Y Differential amplifiers and active filters Y Telecommunications signal recovery Connection Diagrams 8-Pin DIP/SO-8 TL/H/12546–1 Top View LM6311 Input Referred Voltage Noise V a ea 5V TL/H/12546–16 Package Ordering NSC Drawing Package Transport MediaInformation Number Marking 8-Pin DIP LM6311IN N08E LM6311IN Rails 8-Pin SO-8 LM6311IM M08A LM6311IM Rails 8-Pin SO-8 LM6311IMX M08A LM6311IM 2.5k Units Tape and Reel TinyPaKTM is a trademark of National Semiconductor Corporation. Obsolete
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) 2000V Differential Input Voltage g10V Voltage at Input/Output Pin (V a), (V b) Supply Voltage (V a –V b) 12V Current at Input Pin g5m A Current at Output Pin (Note 3) g80 mA Current at Power Supply Pin 80 mA Lead Temperature (soldering, 10 sec) 260 Storage Temp. Range b65§Ct o a150§C Junction Temperature (Note 4) 150§C Operating Ratings (Note 1) Supply Voltage g2.25V to g6V Junction Temperature Range LM6311I b40§C s TJ s a85§C Thermal resistance ( iJA) N Package, 8-pin Molded DIP 125 §C/W g5V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for T J e 25§C, V a e 5V, V b eb 5V, V CM e VO e 0V and R L e %. Boldface limits apply at the temperature extreme S. Typ LM6311I Symbol Parameter Conditions (Note 5) Limit Units (Note 6) VOS Input Offset Voltage 0.5 2.5 mV 4.0 max TCVOS Input Offset Voltage 5 mV/§CAverage Drift IB Input Bias Current 8 30 mA 75 max TCIB Input Bias Current 0.3 mA/§CAverage Drift Ioffset Input Offset Current 0.5 5 mA 14 max TCIoffset Input Offset Current 0.02 mA/§CAverage Drift CMRR Common Mode VCM e g2.5V 90 60 db Rejection Ratio 54 min CMVR Common Mode CMRR e 60 db g3.5 g3.2 VVoltage Range aPSRR Positive Power Va e 4.5V to 5V 62 dbSupply Rejection Vb eb 5.0V 75 55 minRatio bPSRR Negative Power Va e 5.0V 62 dbSupply Rejection Vb eb 4.5V to b5.0V 75 55 minRatio CIN-CM Common-Mode 2.5 pFInput Capacitance CIN-DIFF Differential-Mode 2.5 pFInput Capacitance AVOL Voltage Gain VO eb 2V to a2V 70 62 dbRL e 1k X 55 http:/ /www.national.com 2 Obsolete
g5V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for T J e 25§C, V a e 5V, V b eb 5V, V CM e VO e 0V and R L e %. Boldface limits apply at the temperature extremes. (Continued) Typ LM6311I Symbol Parameter Conditions (Note 5) Limit Units (Note 6) VO Output Swing RL e 100X 3.4 3.1 V 1.2 min b3.4 b3.1 V b1.2 max RL e 1k X 3.9 3.5 V b2.5 min b3.9 b3.5 V b2.5 max ROUT Output Resistance Closed Loop 0.1 X max IS Supply Current 14 16 mA 17 max g5V AC Electrical Characteristics Unless otherwise specified, all limits guaranteed for T J e 25§C, V a e 5V, V b eb 5V, V CM e VO e 0V and R L e 100X. Boldface limits apply at the temperature extremes. Typ LM6311I Symbol Parameter Conditions (Note 5) Limit Units (Note 6) SR Slew Rate AV ea 2, 2V Output Pulse 200 V/ms b3d BB W b3db Bandwidth A V ea 1 110 MHz b3d bB W b3 dB Bandwidth A V ea 2 40 MHz Dg Differential Gain A V ea 2, 150 X Load 0.12 %(Note 7) Dp Differential Phase A V ea 2, 150 X Load 0.35 Deg(Note 7) en Input-Referred 1 MHz k f k 100 MHz 2.3 nV 0HzVoltage Noise in Input-Referred 1 MHz k f k 100 MHz 3.5 nV 0HzCurrent Noise http:/ /www.national.com3 Obsolete
e 5V, V b e 0V, V CM e 2.5V, V O e 2.5V and R L e %. Boldface limits apply at the temperature extremes. Typ LM6311I Symbol Parameter Conditions (Note 5) Limit Units (Note 6) VOS Input Offset Voltage 0.3 3.0 mV 5.0 max TCVOS Input Offset Voltage 5 mV/§CAverage Drift IB Input Bias Current 6 16 mA 30 max TCIB Input Bias Current 0.3 mA/§CAverage Drift Ioffset Input Offset Current 0.6 6 mA max TCIoffset Input Offset Current 0.02 mA/§CAverage Drift CMRR Common Mode VCM e 1.75 to 3.25 90 65 db Rejection Ratio 50 min aPSRR Positive Power Supply V a e 4.75V to 6V 70 60 db Rejection Ratio 50 min CIN-CM Common-Mode 2.5 pFInput Capacitance CIN-DIFF Differential-Mode 2.5 pFInput Capacitance VO Output Swing RL e 100X to 2.5V 4.2 3.6 V 3.4 min 0.9 1.4 V 1.6 max RL e 1k X to 2.5V 4.3 3.8 V 3.6 min 0.70 1.2 V 1.4 max AVOL Voltage Gain VO e 2.0V to 3.0V 67 55 dbRL e 1k X to 2.5V 50 IS Supply Current 11 13 mA 14 max http:/ /www.national.com 4 Obsolete
Symbol Parameter Conditions (Note 5) Limit Units (Note 6) SR Slew Rate AV ea 2, 0.5V Output Pulse 100 V/ms b3dB BW b3dB Bandwidth A V ea 2 40 MHz Note 1: Absolute maximum Ratings indicate limits beyond which damage to the device my 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 X 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 T J(max) iJA and T A. 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. Note 7: Differential Gain and Phase performace are sensitive to layout. Follow layout suggestions in text for best results. http:/ /www.national.com5 Obsolete
Typical Performance Curves TA e 25§C, V a ea 5V, V b eb 5V, R F e 100X,R L e 100X unless noted g5V CURVES AV ea 1 Gain and Phase vs Frequency TL/H/12546–3 AV ea 2 Gain and Phase vs Frequency TL/H/12546–4 AV eb 1 Gain and Phase vs Frequency TL/H/12546–5 http:/ /www.national.com 6 Obsolete
Typical Performance Curves TA e 25§C, V a ea 5V, V b eb 5V, R F e 100X,R L e 100X unless noted (Continued) g5V CURVES (Continued) AV ea 2 Pulse Response TL/H/12546–6 Ground Pulse Response AV ea 2 Reference to TL/H/12546–7 Pulse Response A V eb 1 Small Signal TL/H/12546–8 Pulse Response A V eb 1 Large Signal TL/H/12546–9 http:/ /www.national.com7 Obsolete
Typical Performance Curves TA e 25§C, V a ea 5V, V b e 0V, R F e 100X,R L e 100X to 2.5V unless noted (Continued) 5V CURVES AV ea 1 Gain and Phase vs Frequency TL/H/12546–10 AV ea 2 Gain and Phase vs Frequency TL/H/12546–11 AV eb 1 Gain and Phase vs Frequency TL/H/12546–12 http:/ /www.national.com 8 Obsolete
Typical Performance Curves TA e 25§C, V a ea 5V, V b e 0V, R F e 100X,R L e 100X to 2.5V unless noted (Continued) 5V CURVES (Continued) AV ea 2 Pulse Response TL/H/12546–13 Pulse Response AV eb 1 Large Signal TL/H/12546–14 Pulse Response A V eb 1 Small Signal TL/H/12546–15 http:/ /www.national.com9 Obsolete
Application Information
The LM6311 is a high speed complementary bipolar amplifi- er with good video performance. The LM6311 can operate on g2.5V supplies, or from a a5V single supply. The LM6311 is available in two package types: DIPs for through hole designs, and SO-8 surface mount packages. Benefits of the LM6311 LOW NOISE The low noise performance of the LM6311 (typically 2.3 nV per root-hertz) makes the LM6311 a good choice for signal recovery, high gain amplifiers other low noise designs. BALANCED DIFFERENTIAL INPUTS The relatively low offset currents and low offset voltage of the LM6311 make it easy to design differential signal recov- ery circuits. The low offset currents and voltage feedback design make it easy to use the LM6311 in conventional ac- tive filter designs. a5V SINGLE SUPPLY OPERATION Single supply operation can avoid the cost of split power supplies, and make it easier to use the LM6311 in single supply digital systems. The LM6311 provides high band- width for a5V single supply operation. See Figure 1 . Using the LM6311 LIMITS AND PRECAUTIONS Supply Voltage The absolute maximum supply voltage which may be ap- plied to the LM6311 is 12V. Designers should not design for more than 10V nominal, and carefully check supply toler- ances under all conditions so that the voltages do not ex- ceed the maximum. Differential Input Voltage Differential input voltage is the difference in voltage be- tween the non-inverting ( a) input and the inverting input (b) of the op amp. The absolute maximum differential input voltage is g10V across the inputs. This limit also applies when there is no power supplied to the op amp. Very fast input pulses into high gain circuits may cause the output to saturate, leading to an overload recovery time in the millisecond range. This requires inputs which are faster than those usually used in video systems and gain levels which will push the output of the amplifier toward the limit of its output swing. Layout and Power Supply Bypassing Since the LM6311 is a high speed (over 50 MHz) device, good high speed circuit layout practices should be followed. This should include the use of ground planes, adequate power supply bypassing, removing metal from around the input pins to reduce capacitance, and careful routing of the output signal lines to keep them away from the input pins. The power supply pins should be bypassed on both the neg- ative and positive supply inputs with capacitors placed close to the pins. Surface mount capacitors should be used for best performance, and should be placed as close to the pins as possible. It is generally advisable to use two capaci- tors at each supply voltage pin. A small surface mount ca- pacitor with a value of around 0.01 mF (10 nF), usually a ceramic type with good RF performance, should be placed closest to the pin. A larger capacitor, usually in the range of 1.0 mFt o4 . 7 mF, should also be placed near the pin. The larger capacitor should be a device with good RF character- istics and low ESR (equivalent series resistance) for best results. Ceramic and tantalum capacitors generally work well as the larger capacitor. It is very important to reduce capacitance at the input and output pins. The ground plane and any other planes (power, etc.) should be ‘‘opened up’’ or removed near the pins. The opening should extend to the middle of the nearest pins as a minimum. The LM6311 is built on a high performance bipolar process. The transistors used in this process have bandwidths much higher than the LM6311 itself. These transistors have a po- tential to oscillate or ring at 400 MHz to 1 GHz when used in layouts where the components are more than (/4 inch 6 mm) away from the op amp pins. These oscillations may produce apparent shifts in voltage offset or excess current consump- tion. To avoid this, keep the input and output resistors as close as possible to their respective pins. Spacing within (/8 (3 mm) or less is recommended for best results. For best performance, low inductance resistors, such as chip resistors, are recommended. The use of wirewound re- sistors is strongly not recommended. DIP devices should use socket pins which are flush with the board. Conventional sockets have additional capacitance and are not recommended. Obviously, the use of wire- wrapped sockets or the ‘‘white plastic’’ push in prototype boards is strongly not recommended. Notes for a5V Single Supply Operation The LM6311 provides good high speed performance at a5V, however, certain limitations should be observed in ap- plying the LM6311. INPUT VOLTAGE RANGE Input voltage should be near the center of the V a and V b supplies. For 5V and ground, the inputs should be between 1.75V and 3.25V. Inputs beyond this range will limit the out- put swing, reduce the common mode rejection and power supply rejection, lower the bandwidth, and tend to greatly increase distortion. For a5V designs, using a reference voltage near a2.5V is recommended. See Figure 2 . OUTPUT VOLTAGE SWING Output voltage swing will depend on the load and on what voltage (ground or 2.5V) is on the other side of the load. At room temperature (25 §C) and a5V supply with a 1 k X load tied to 2.5V, the LM6311 will swing from 1.0V to 4.0V. For a ground referenced load, this output range will shift about 400 mV–500 mV towards ground. See Figure 3 for schematics of loads referenced to the center and to ground. http:/ /www.national.com11 Obsolete
Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin Small Outline Package Order Number LM6311IM or LM6311MX http:/ /www.national.com13 Obsolete
LM6311 Low Noise High Speed Voltage Feedback Operational Amplifier Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Lit. Ý108288-001 8-Pin Molded DIP Package Order Number LM6311IN 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 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd.
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