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LT1010 Datasheet(PDF) 10 Page - Linear Technology |
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LT1010 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  LT1010 10 1010fe APPLICATIONS INFORMATION This is a good example of how fast op amps can be made quite easy to use by employing an output buffer. Integrator A lowpass amplifier can be formed just by using large CF in the inverter described earlier, as long as the increasing closed-loop output impedance above the cutoff frequency is not a problem and the op amp is capable of supplying the required current at the summing junction. stage. Feedback is arranged in the conventional manner, although the 68µF-0.01µF combination limits DC gain to unity for all gain settings. For applications sensitive to NTSC requirements, dropping the 25Ω output stage bias value will aid performance. A2 LT1010 RF 20k CF 500pF CI IIN 1010 AI07 VOUT – + A1 LT1012 If the integrating capacitor must be driven from the buffer output, the circuit above can be used to provide capacitive load isolation. As before, the stability with large capacitive loads is determined by RFCF. Wideband Amplifiers This simple circuit provides an adjustable gain video amplifier that will drive 1VP-P into 75Ω. The differential pair provides gain with the LT1010 serving as an output BIAS + LT1010 22µF + 22µF TYPICAL SPECIFICATIONS 1VP-P INTO 75 AT A = 2 0.5dB TO 10MHz 3dB DOWN AT 16MHz AT A = 10 0.5dB TO 4MHz –3dB = 8MHz + 68µF 1010 AI08 PEAKING 5pF to 25pF 25 900 OUTPUT (75) 0.01µF 1k GAIN SET 5.1k Q1, Q2: 2N3866 –15V 8.2k 15V –15V Q2 Q1 INPUT A2 LT1010 R1 100 R2 800 C1 15pF VIN 1010 AI09 VOUT – + A1 HA2625 This shows the buffer being used with a wideband ampli- fier that is not unity-gain stable. In this case, C1 cannot be used to isolate large capacitive loads. Instead, it has an optimum value for a limited range of load capacitances. The buffer can cause stability problems in circuits like this. With the TO-220 packages, behavior can be improved by raising the quiescent current with a 20Ω resistor from the bias terminal to V+. Alternately, devices in the miniDIP can be operated in parallel. It is possible to improve capacitive load stability by oper- ating the buffer class A at high frequencies. This is done by using quiescent current boost and bypassing the bias terminal to V– with more than 0.02µF. A2 LT1010 R1 400 R2 1.6k INPUT 1010 AI10 OUTPUT – + A1 HA2625 Putting the buffer outside the feedback loop as shown here will give capacitive load isolation, with large output capacitorsonlyreducingbandwidth.Bufferoffset,referred to the op amp input, is divided by the gain. If the load re- sistance is known, gain error is determined by the output resistance tolerance. Distortion is low. |
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