LT1192 UUWUAPPLICATIO S I FOR ATIOOutput ShutdownSmall-Signal Transient Response 0V VSHDN – 5V VOUT LT1192 • TA08 LT1192 • TA09 1MHz SINE WAVE GATED OFF WITH AV = 10, SMALL-SIGNAL RISE TIME, WITH FET PROBES SHUTDOWN PIN, AV = 10, RL = 1k Closed-Loop Voltage Gain vs Frequency The ability to maintain shutoff is shown on the curve Shutdown Supply Current vs Temperature in the Typical 24 Performance Characteristics section. At very high 22 elevated temperatures it is important to hold the SHDN pin AV = 10 20 close to the negative supply to keep the supply current 18 from increasing. 16 Operating with Low Closed-Loop Gains AV = 5 14 When using decompensated amplifiers it should be real- CLOSED-LOOP VOLTAGE GAIN (dB) 12 ized that peaking in the frequency domain, and overshoot 10 and ringing in the time domain occur as closed-loop gain 100k 1M 10M 100M 1G is lowered. The LT1192 is stable to a closed-loop gain of FREQUENCY (Hz) LT1192 • TA10 5, however, peaking and ringing can be minimized by increasing the closed-loop gain. For instance, the LT1192 peaks 5dB when used in a gain of 5, but peaks by less than Other precautions include: 0.5dB for a closed-loop gain of 10. Likewise, the overshoot 1. Use a ground plane (see Design Note 50, High Fre- drops from 50% to 4% for gains of 10. quency Amplifier Evaluation Board). Murphy Circuits 2. Do not use high source impedances. The input capaci- tance of 2pF, and R There are several precautions the user should take when S = 10k for instance, will give an 8MHz – 3dB bandwidth. using the LT1192 in order to realize its full capability. 3. PC board socket may reduce stability. Although the LT1192 can drive a 50pF load, isolating the capacitance with 20Ω can be helpful. Precautions prima- 4. A feedback resistor of 1k or lower reduces the effects of rily have to do with driving large capacitive loads. stray capacitance at the inverting input. 9
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