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LM6317 Fiches technique(PDF) 6 Page - National Semiconductor (TI) |
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LM6317 Fiches technique(HTML) 6 Page - National Semiconductor (TI) |
6 / 8 page Application Notes Using the LM6317 LIMITS AND PRECAUTIONS The absolute maximum supply voltage which may be ap- plied to the LM6317 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 (b) in- put of the op amp The absolute maximum differential input for the LM6317 is 10V across the inputs This limit also ap- plies 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 com- parators or forcing the inputs to different voltages In some designs diodes protection may be needed between the in- puts as shown in Figure 1 TLH12542 – 20 FIGURE 1 Input Protection for LM6317 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 oscilla- tion and other degraded AC performance in high speed cir- cuits 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 perform- ance 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 in- put impedance and low input capacitance However the probe ground leads provide a long ground loop that will pro- duce errors in measurement Instead the probes can be grounded directly by removing the ground leads and probe jackets and using scope probe jacks COMPONENTS SELECTION AND FEEDBACK RESISTOR It is important in high speed applications to keep all compo- nent leads short because wires are inductive at high fre- quency For discrete components choose carbon composi- tion-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 data- sheet Figure 2 illustrates the compensation circuit TLH12542 – 21 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 individual- ly by placing 001 mF creramic capacitors directly to power supply pins and 22 mF tantalum capacitors close to the power supply pins TLH12542 – 22 FIGURE 3 Power Supply Bypassing http www nationalcom 6 |
Numéro de pièce similaire - LM6317 |
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Description similaire - LM6317 |
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