LT1193
APPLICATIO S I FOR ATIO
Closed-Loop Voltage Gain vs Frequency
25
CLOSED-LOOP VOLTAGE GAIN (dB)
A
V
= 10
V
S
=
±5V
T
A
= 25°C
15
A
V
= 5
A
V
= 3
A
V
= 2
5
–5
100k
1M
10M
FREQUENCY (Hz)
100M
LT1193 • TA07
Closed-Loop Voltage Gain vs Frequency
10
CLOSED-LOOP VOLTAGE GAIN (dB)
8
V
S
=
±5V
T
A
= 25°C
A
V
= 2
R
FB
= 300Ω
R
G
= 300Ω
C
FB
= 0pF
C
FB
= 5pF
6
C
FB
= 10pF
4
C
FB
= 15pF
R
G
2
CLOSED LOOP VOLTAGE GAIN (dB)
0
100k
1M
10M
FREQUENCY (Hz)
100M
LT1193 • TA08
Small-Signal Transient Response
LT1193 • TA09
A
V
= 2, OVERSHOOT = 40%, R
FB
= 1k, R
G
= 1k
100Ω, while operating on
±5V
supplies and gains > 3. On
a single 5V supply, the LT1193 can swing 2.6V
P-P
for
gains
≥
2.
U
Small-Signal Transient Response
LT1193 • TA10
W
U U
A
V
= 2 WITH 8pF FEEDBACK CAPACITOR
RISE TIME = 3.75ns, R
FB
= 1k, R
G
= 1k
Double Terminated Cable Driver
5V
3
+
7
2
–
1 LT1193
8
6
75Ω
CABLE
75Ω
+
–
4
–5V
R
FB
C
FB
Closed-Loop Voltage Gain vs Frequency
8
6
4
2
0
–2
–4
–6
100k
A
V
= 1
R
FB
= 300Ω
R
G
= 300Ω
C
FB
= 10pF
A
V
= 2
R
FB
= 300Ω
R
G
= 100Ω
C
FB
= 0pF
1M
10M
100M
LT1193 • TA11
FREQUENCY (Hz)
When driving a cable it is important to terminate the cable
to avoid unwanted reflections. This can be done in one of
two ways: single termination or double termination. With
single termination, the cable must be terminated at the
receiving end (75Ω to ground) to absorb unwanted en-
ergy. The best performance can be obtained by double
termination (75Ω in series with the output of the amplifier,
and 75Ω to ground at the other end of the cable). This
1193fb
9
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