LM6310

LM6310 NSC | Alldatasheet

Document overview

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Technical content

Features

Y TRI-STATE output disable to high impedance Y Disable time k 25 ns Y TTL/CMOS compatible disable input Y Typical differential gain 0.05% Y Typical differential Phase 0.33 § Y 60 mA output current Y Typical supply current k 4.5 mA Y k 1 mA current when disabled Y Specified for g5V operation

Applications

Y Video Multiplexers and Multimedia Cards Y Virtual Reality and Desktop Video Y Portable Video Y Video Distribution Connection Diagram 8-Pin DIP/SO-8 TL/H/12545–1 Top View TL/H/12545–2 Package Ordering NSC Drawing Package Transport MediaInformation Number Marking 8-Pin DIP LM6310IN N08E LM6310IN Rails 8-Pin SO-8 LM6310IM M08A LM6310IM Rails 8-Pin SO-8 LM6310IMX M08A LM6310IM 2.5k Units Tape and Reel TRI-STATEÉ is a registered trademark of National Semiconductor Corporation. TinyPaKTM is a trademark of National Semiconductor Corporation.

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) 1500V Differential Input Voltage g2V Voltage at Input/Output Pin (V a)a0.1V, (V b)b0.1V 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 Temp. (soldering, 10 sec.) 260 Storage Temperature Range b65§Ct o a150§C Junction Temperature (Note 4) 150 §C Operating Ratings (Note 1) Supply Voltage V b eb 5V, V a ea 5V Junction Temperature Range LM6310I 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 100X. Boldface limits apply at the temperature extremes Typ LM6310I Symbol Parameter Conditions (Note 5) Limit Units (Note 6) VOS Input Offset Voltage 1 5 mV 9 max TCVOS Input Offset Voltage 30 mV/§CAverage Drift IB Input Bias Current 0.2 1.5 mA Non-Inverting ( a) Input 3.0 max IB Input Bias Current 2 8 mA Inverting ( b) Input 14 max RIN Input Resistance 6M XNon-Inverting ( a) Input RIN Input Resistance 180 XInverting ( b) Input CMRR Common Mode b1.0V s VCM s a1.0V 50 43 db Rejection Ratio 40 min aPSRR Positive Power V a e 4.5V to 5.5V 52 46 db Supply Rejection Ratio V b eb 5.0V 42 min bPSRR Negative Power V a e 5.0V 52 46 db Supply Rejection Ratio V b eb 4.5V to b5.5V 42 min CIN Common-Mode 2p FInput Capacitance VO Output Swing R L e 100X 3.5 3.1 V 2.4 min b2.8 b2.7 V b1.6 max RL e % 4.0 3.9 V 3.7 min b3.3 b3.2 V b2.8 max http:/ /www.national.com 2

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 100X. Boldface limits apply at the temperature extremes (Continued) Typ LM6310I Symbol Parameter Conditions (Note 5) Limit Units (Note 6) ISC Output Current 10 X to 0V 60 44 mA Sourcing 20 min ROUT Output Resistance Closed Loop 0.06 X max IS Supply Current for DISABLE (Pin 8) l 2.0V 3.5 4.5 mA Normal Operation Mode 5.0 max IS Supply Current Powerdown DISABLE (Pin 8) k 0.8V 0.8 1.0 mA (TRI-STATE) Mode 1.2 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 LM6310I Symbol Parameter Conditions (Note 5) Limit Units (Note 6) SR Slew Rate A V ea 2, 2V Output Pulse 300 V/ ms b3d BB W b3db Bandwidth A V ea 2 90 MHz Dg Differential Gain A V ea 2, 150 X Load (75 X Back-Terminated) 0.05 %(Note 7) 1 k X Pull-Down to b5V on Output Dp Differential Phase A V ea 2, 150 X Load (75 X Back-Terminated) 0.33 §(Note 7) 1 k X Pull-Down to b5V on Output en Input-Referred f e 1 MHz 5 nV 0HzVoltage Noise Input-Referred Current Noise f e 1 MHz 3 pA 0HzNon-Inverting ( b) Input Input-Referred Current f e 1 MHz 12 pA 0HzNoise Inverting ( b) Input tON Turn On Time DISABLE (Pin 8) Low to High 50 ns tOFF Turn Off Time DISABLE (Pin 8) High to Low 25 ns Output Isolation Output Isolation from Inputs when 55 dbDISABLE e Low 10 MHz 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 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 P D 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 performance is sensitive to layout. Follow layout suggestions in text for best results. http:/ /www.national.com3

Typical Performance Characteristics AV ea 2, R F e 348X,V aea 5V, V beb 5V, R L e 100X,T J e 25§C unless otherwise noted Voltage vs Temperature LM6310 Input Offset TL/H/12545–3 Current vs Temperature LM6310 Non-Inverting Input TL/H/12545–4 Current vs Temperature LM6310 Inverting Input TL/H/12545–5 vs Load (Volts Peak-to-Peak) Output Voltage Swing TL/H/12545–6 LM6310 Common Mode Rejection Ratio vs Frequency TL/H/12545–7 LM6310 Power Supply Rejection Ratio vs Frequency TL/H/12545–8 http:/ /www.national.com 4

Typical Performance Characteristics AV ea 2, R F e 348X,V aea 5V, V beb 5V, R L e 100X,T J e 25§C unless otherwise noted (Continued) Output Signal Isolation in Disable Mode Reference Level e 100 mV Marker 4 025 567 Hz 68.8755 mV TL/H/12545–9 LM6310 Normal Operation. Disable e High. Note reference level is 100 mV. 4 MHz signal is at 69 mV. Reference Level e 50 mV Marker 4 025 567 Hz 28.9085 mV TL/H/12545–10 LM6310 Disable e Low. Note that the reference level is 50 mV. The 4 MHz signal is near the noise level, attenuated l 1000:1. http:/ /www.national.com5

Typical Performance Characteristics (Continued) RF e 348X,V aea 5V, V beb 5V, R L e 100X,T J e 25§C unless otherwise noted Gain of a1 AV ea 1 Non-Inverting TL/H/12545–11 See Application Information for discussion of R F value for A V ea 1 AV ea 1 Pulse Response TL/H/12545–12 Note: RF e 1k X AV ea 1 Gain and Phase vs Frequency TL/H/12545–13 http:/ /www.national.com 6

Typical Performance Characterisitcs (Continued) RF e 348X,V aea 5V, V beb 5V, R L e 100X,T J e 25§C unless otherwise noted Gain of a2 AV ea 2 Non-Inverting TL/H/12545–14 AV ea 2 Small Signal Pulse Response TL/H/12545–15 AV ea 2 Large Signal Pulse Response TL/H/12545–16 AV ea 2 Gain and Phase vs Frequency TL/H/12545–17 http:/ /www.national.com7

Typical Performance Characteristics (Continued) RF e 348X,V aea 5V, V beb 5V, R L e 100X,T J e 25§C unless otherwise noted Gain of a5 AV ea 5 Non-Inverting TL/H/12545–18 AV ea 5 Pulse Response TL/H/12545–19 AV ea 5 Gain and Phase vs Frequency TL/H/12545–20 http:/ /www.national.com 8

Typical Performance Characteristics (Continued) RF e 348X,V aea 5V, V beb 5V, R L e 100X,T J e 25§C unless otherwise noted Gain of b1 AV eb 1 Inverting TL/H/12545–21 AV eb 1 Pulse Response TL/H/12545–22 AV eb 1 Gain and Phase vs Frequency TL/H/12545–23 http:/ /www.national.com9

Typical Performance Characteristics (Continued) RF e 348X,V aea 5V, V beb 5V, R L e 100X,T J e 25§C unless otherwise noted AV eb 2 Inverting TL/H/12545–24 AV eb 2 Gain and Phase vs Frequency TL/H/12545–25 Gain of b5 AV eb 5 Inverting TL/H/12545–26 AV eb 5 Gain and Phase vs Frequency TL/H/12545–28 http:/ /www.national.com 10

Application Information

The LM6310 is a high speed complementary bipolar amplifi- er with good video performance. The output of the LM6310 can be turned off with a logic level signal on the DISABLE pin. The output then goes to a high impedance state (TRI-STATE) which makes it easy to multiplex signals with the LM6310. The LM6310 responds very quickly to the DIS- ABLE input, (under 25 ns) making it useful for video effects and adding or selecting data from video streams, such as TELTEXT. Note: The LM6310 will operate normally when there is no connection to the DISABLE pin. The LM6310 has low power consumption for a high speed part, typically k 4.0 mA. When the output is disabled the typical current consumption drops below 1.0 mA. This makes the LM6310 ideal for portable video equipment. The LM6310 is available in two package types: DIPs for through hole designs, and SO-8 surface mount packages. The LM6310 uses a current feedback design to achieve good video performance at low current and low cost. Benefits of the LM6310 The LM6310 provides good video performance for consum- er and portable applications at low current and low cost. The disable option can reduce power consumption in porta- ble applications. The video multiplexing capability of the disable function can also be used to improve the testability of systems by provid- ing an easy means to open the analog signal path and insert test or reference signals. Since the multiplexing configuration is a function of the out- put and disable signal wiring, using multiple LM6310’s has some strong advantages over a one chip video multiplexer. First, larger multiplexers are possibleÐwith careful layout, up to 8 video inputs can be multiplexed. Frequently in multiplexer designs, one or more of the input signals will need to be buffered with an amplifier, and the output may also need a buffer or driver amplifier. Wiring up LM6310s to do multiplexing lets the LM6310 act as both the input buffer and the output driver. This can reduce parts and save money. In addition to reducing cost, the signals will go through fewer amplifiers. This can mean improved signal quality in addition to lower cost. DESIGN ADAPTABILITY AND SYSTEM DESIGN FLEXIBILITY Using the LM6310 allows more adaptable, cost effective de- sign. If you nee d a 3 input multiplexer, you can make one, avoiding the extra cost of unused devices of quad multiplex- er. If you need a 5 input multiplexer, you can design this with

5 LM6310s, saving the space and cost of two video multi-

plexer chips. Using the LM6310 on a distributed multiplexer can improve manufacturing flexibility. You can design a low cost system with the minimal number functions needed for the low end of the market. Additional functions (close captioning, TELETEXT, digital video, information services, etc.) can be designed on to add-in cards. Since the LM6310 will operate normally when the DISABLE input is floating (no con- nection), the additional functions can be built on the add-in cards. By using LM6310s on both the basic board and the add-in cards, video and other signals can be digitally switched to implement the new add-in functions. Using LM6310s avoids adding the cost of a dedicated multiplexer in the low cost system, and increases design flexibility. EASY TO USE, COST-EFFECTIVE CURRENT FEEDBACK When used with good high speed layout in a circuit like those shown in the section on typical performance curves, the LM6310 will provide wide bandwidth, high slew and good video performance. Modern current feedback devices can provide higher bandwidth at lower current and at lower cost than conventional voltage feedback devices. Note on Performance Curves and Datasheet Limits Important: Performance curves represent an average of parts, and are not limits . COMMON MODE REJECTION RATIO The CMRR of 50 dB is valid for inputs which are within 1V of ground for g5V supplies. In other words, the input should be within 1V of the center of the V a and V b power supply rails. Moving the inputs away from the center of the supplies will result in reduced performance and non-linearities. NON-INVERTING ( a) INPUT CURRENT vs TEMPERATURE This curve is relatively flat over temperature (typically under 1 mA), that even an input source impedance of 2 k X will result in only a millivolt shift on the input voltage. OUTPUT VOLTAGE SWING vs LOAD This curve shows that almost all of the output swing is avail- able for the 150 X loads usually used in back-terminated 75X video systems. OUTPUT SIGNAL ISOLATION IN DISABLE MODE The top graph shows the spectrum analyzer output of an LM6310 in normal operaiton. The 4 MHz peak has an ampli- tude of 69 mV. Note that the reference level is 100 millivolts (100 mV), second and third harmonics are present, and the noise floor is towards the bottom of the graph. With the LM6310 disabled, we need to greatly increase the gain of the spectrum analyzer to see the feedthrough of the 4 MHz signal. Note that the reference level is now 50 micro- volts (50 mV) and the noise floor is towards the middle of the graph. The 4 MHz signal now has an amplitude of 28.9 mV, less than one-thousandth the normal signal. Note that the LM6310 will function normally (output on) with the DISABLE input (pin 8) left floating (not connected). PULSE RESPONSE AND GAIN vs FREQUENCY FOR A V ea 1 The feedback resistor (R F) value for the pulse response photo is 1 k X. A value of 1 k X t o2k X is recommended for all voltage follower (A V ea 1) circuits using the LM6310. The gain and phase plot for A V ea 1 was done with the usual value of R F e 348X for comparison with the other gain and phase plots. http:/ /www.national.com11

Application Information (Continued) Using the LM6310 LIMITS AND PRECAUTIONS SUPPLY VOLTAGE The absolute maximum supply voltage which may be ap- plied to the LM6310 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 g2V 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 LM6310 as com- parator or forcing the inputs to different voltages. 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 LM6310 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 mF–4.7 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 LM6310 is built on a high performance bipolar process. The transistors used in this process have bandwidths much higher that the LM6310 itself. These transistors have a po- tential to oscillate or ring at 400 b1 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 consumption. To avoid this, keep the input and output resistors as close as possible to their respective pins. Spacing within (/8 inch (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. FEEDBACK RESISTOR VALUES (R Since the LM6310 is a current feedback amplifier, the value of the feedback resistor is important to the performance of the op amp. For circuits other than voltage followers, the fastest pulse response is usually obtained with a resistor value of 348 X. To get higher gain, decrease the source re- sistor value (R S), while leaving the feedback resistor at 348X. (Schematics for various gains are shown in the typi- cal performance curves section of this datasheet.) Current feedback amplifiers generally do not tolerate reac- tive components in the feedback path. Therefore, do not bypass the feedback resistor (R F) with a feedback capaci- tor. This will result in instability. Overshoot and ringing of the LM6310 can be reduced by increasing the value of the feedback resistor above 348 X. The value of 348 X will normally produce a near critically damped pulse response, with about 3%–5% overshoot. Overshoot and bandwidth peaking may be undesirable in some designs. Selecting a larger value for the feedback re- sistor will reduce the overshoot and bandwidth peaking. Too large a value will reduce the circuit bandwidth and degrade pulse response. Do not place a capacitor across feedback resistor. For voltage followers (A V ea 1) there is no source resist- ance. A feedback resistor must be usedÐdirect connect from the output to the inverting input will usually result in oscillation. Values in the range of 1 k X –2 k X usually give good results. The pulse response photo for A V ea 1 was obtained wit ha1k X feedback resistor. Since the small stray capacitance from the circuit layout, other components, and specific circuit bandwidth require- ments will vary, it is often useful to select final values based on prototypes which are similar in layout to the production circuit boards. Reflections The output slew rate of the LM6310 is fast enough to pro- duce reflected signals in many cables and long circuit traces. For best pulse performance, it may be necessary to terminate cables and long circuit traces with their character- istic impedance to reduce reflected signals. Reflections should not be confused with overshoot. Reflec- tions will depend on cable length, while overshoot will de- pend on load and feedback resistance and capacitance. When determining the type of problem, often removing or drastically shortening the cable will reduce or eliminate re- flections. Overshoot can exist without a cable attached to the op amp output. http:/ /www.national.com 12

Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin Small Outline Package Order Number LM6310IM or LM6310IMX http:/ /www.national.com15

LM6310 High Speed Low Power Operational Amplifier with TRI-STATE Output Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Lit. Ý108287-001 8-Pin Molded DIP 8-Lead (0.300 × Wide) Molded Dual-In-Line Package Order Number LM6310IN 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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