LT1191C データシートの表示（PDF） - Linear Technology
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LT1191C Datasheet PDF : 12 Pages
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LT1191
APPLICATI S I FOR ATIO
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.
Murphy Circuits
There are several precautions the user should take when
using the LT1191 in order to realize its full capability.
Although the LT1191 can drive a 30pF load, isolating the
capacitance with 10Ω can be helpful. Precautions prima-
rily have to do with driving large capacitive loads.
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
capacitance 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. (For in-
stance, closed-loop gain of 2 can use RFB = 300Ω and
RG = 300Ω.)
Driving Capacitive Load
Driving Capacitive Load
AV = –1, IN DEMO BOARD, CL = 30pF
LT1191 • TA11
Murphy Circuits
AV = –1, IN DEMO BOARD, CL = 30pF
WITH 10Ω ISOLATING RESISTOR
LT1191 • TA12
5V
3+
7
6
LT1191
2–
4
–5V
COAX
An Unterminated Cable Is
a Large Capacitive Load
10
5V
3+
7
6
LT1191
2–
4
1X SCOPE
–5V
PROBE
A 1X Scope Probe Is a
Large Capacitive Load
5V
3+
7
6
LT1191
2–
4
–5V
SCOPE
PROBE
LT1191 • TA13
A Scope Probe on the Inverting
Input Reduces Phase Margin
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