LT1192CS8 Ver la hoja de datos (PDF) - Linear Technology
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LT1192CS8 Datasheet PDF : 12 Pages
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APPLICATIO S I FOR ATIO
Output Shutdown
0V
VSHDN
– 5V
VOUT
LT1192
Small-Signal Transient Response
1MHz SINE WAVE GATED OFF WITH
SHUTDOWN PIN, AV = 10, RL = 1k
LT1192 • TA08
LT1192 • TA09
AV = 10, SMALL-SIGNAL RISE TIME, WITH FET PROBES
The ability to maintain shutoff is shown on the curve
Shutdown Supply Current vs Temperature in the Typical
Performance Characteristics section. At very high
elevated temperatures it is important to hold the SHDN pin
close to the negative supply to keep the supply current
from increasing.
Operating with Low Closed-Loop Gains
When using decompensated amplifiers it should be real-
ized that peaking in the frequency domain, and overshoot
and ringing in the time domain occur as closed-loop gain
is lowered. The LT1192 is stable to a closed-loop gain of
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
0.5dB for a closed-loop gain of 10. Likewise, the overshoot
drops from 50% to 4% for gains of 10.
Murphy Circuits
There are several precautions the user should take when
using the LT1192 in order to realize its full capability.
Although the LT1192 can drive a 50pF load, isolating the
capacitance with 20Ω can be helpful. Precautions prima-
rily have to do with driving large capacitive loads.
Closed-Loop Voltage Gain vs Frequency
24
22
AV = 10
20
18
16
AV = 5
14
12
10
100k
1M
10M
100M
1G
FREQUENCY (Hz)
LT1192 • TA10
Other precautions include:
1. Use a ground plane (see Design Note 50, High Fre-
quency Amplifier Evaluation Board).
2. Do not use high source impedances. The input capaci-
tance of 2pF, and RS = 10k for instance, will give an
8MHz – 3dB bandwidth.
3. PC board socket may reduce stability.
4. A feedback resistor of 1k or lower reduces the effects of
stray capacitance at the inverting input.
9
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