LT1192CJ8 Linear Technology, LT1192CJ8 Datasheet - Page 8

• Manufacturer Part Number: LT1192CJ8
• Description: ULTRA HIGH SPEED OA (AV=5)
• Manufacturer: Linear Technology

Specifications of LT1192CJ8

• Applications: General Purpose
• Number Of Circuits: 1
• Slew Rate: 450 V/µs
• Current - Supply: 32mA
• Current - Output / Channel: 50mA
• Voltage - Supply, Single/dual (±): 4.75 V ~ 16 V, ±2.38 V ~ 8 V
• Mounting Type: Through Hole
• Package / Case: 8-CDIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

1V/DIV
LT1192
APPLICATIO S I FOR ATIO
amplified to 1mV/DIV the settling time to 1mV is 4.132 s
for the 0.1 F bypass; the time drops to 140ns with multiple
bypass capacitors.
Cable Terminations
The LT1192 operational amplifier has been optimized as a
low cost video cable driver. The 50mA guaranteed output
current enables the LT1192 to easily deliver 7.5V
100 , while operating on 5V supplies or 2.6V
single 5V supply.
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 (75
8
1V/DIV
V
V
OUT
OUT
0V
0V
SUPPLY BYPASS CAPACITORS = 0.1 F + 4.7 F TANTALUM
Settling Time Good Bypass
SUPPLY BYPASS CAPACITORS = 0.1 F
Settling Time Poor Bypass
SETTLING TIME TO 1mV, A
SETTLING TIME TO 1mV, A
U
to ground) to absorb unwanted
U
V
V
W
= –1
= –1
LT1192 • TA06
LT1192 • TA05
U
0V
0V
P-P
P-P
V
1mV/DIV
V
1mV/DIV
OUT
OUT
on a
into
energy. The best performance can be obtained by double
termination (75 in series with the output of the ampli-
fier, and 75 to ground at the other end of the cable). This
termination is preferred because reflected energy is
absorbed at each end of the cable. When using the double
termination technique it is important to note that the
signal is attenuated by a factor of 2, or 6dB. For a cable
driver with a gain of 5 (op amp gain of 10) the – 3dB
bandwidth is 56MHz with only 0.25dB of peaking.
Using the Shutdown Feature
The LT1192 has a unique feature that allows the amplifier
to be shut down for conserving power or for multiplexing
several amplifiers onto a common cable. The amplifier will
shut down by taking Pin 5 to V
dissipates 15mW while maintaining a true high impedance
output state of 15k in parallel with the feedback resis-
tors. The amplifiers must be used in a noninverting con-
figuration for MUX applications. In inverting configura-
tions the input signal is fed to the output through the
feedback components. When the output is loaded with as
little as 1k from the amplifier’s feedback resistors, the
amplifier shuts off in 400ns. This shutoff can be under the
control of HC CMOS operating between 0V and – 5V.
Cable Driver Voltage Gain vs Frequency
24
20
16
12
8
4
0
100k
R
Double Terminated Cable Driver
G
T
A
= 25 C
3
2
R
R
+
–
FB
LT1192
G
A
V
= 100
= 910
–5V
5V
= +5
1M
4
7
FREQUENCY (Hz)
6
–
. In shutdown, the amplifier
R
75
FB
10M
R = 910
R = 47
A = +10
CABLE
FB
G
V
75
LT1192 • TA07
100M