LT1190 データシートの表示（PDF） - Linear Technology
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LT1190 Datasheet PDF : 12 Pages
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LT1190
APPLICATIO 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 shut-
down 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 LT1190 in order to realize its full capability.
Although the LT1190 can drive a 50pF 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 instance,
closed-loop gain of 2 can use RFB = 300Ω and RG =
300Ω.)
Driving Capacitive Load
Driving Capacitive Load
AV = –1, IN DEMO BOARD, CL = 50pF
LT1190 • TA11
Murphy Circuits
AV = –1, IN DEMO BOARD, CL = 50pF
WITH 10Ω ISOLATING RESISTOR
LT1190 • TA12
5V
3+
7
6
LT1190
2–
4
–5V
COAX
An Unterminated Cable Is
a Large Capacitive Load
10
5V
3+
7
6
LT1190
2–
4
1X SCOPE
–5V
PROBE
A 1X Scope Probe Is a
Large Capacitive Load
5V
3+
7
6
LT1190
2–
4
–5V
SCOPE
PROBE
LT1190 • TA13
A Scope Probe on the Inverting
Input Reduces Phase Margin
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