LT1193
TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage Swing
vs Load Resistance
5
V
S
=
±
5V
T
A
= –55°C
900
800
– SLEW RATE
OUTPUT VOLTAGE SWING (V)
OUTPUT VOLTAGE STEP (V)
3
SLEW RATE (V/µs)
1
T
A
= 25°C
T
A
= 125°C
–1
–3
T
A
= 125°C
T
A
= –55°C, 25°C
–5
10
100
LOAD RESISTANCE (Ω)
1000
LT1193 • TPC19
Large-Signal Transient Response
A
V
= 2, R
L
= 150Ω, R
FB
= 300Ω, R
G
= 300Ω
APPLICATIO S I FOR ATIO
The LT1193 is a video difference amplifier which has two
uncommitted high input impedance (+) and (–) inputs.
The amplifier has one set of inputs that can be used for
reference and feedback. Additionally, this set of inputs
give gain adjust and DC control to the differential amplifier.
The voltage gain of the LT1193 is set like a conventional
operational amplifier. Feedback is applied to Pin 8 and it is
optimized for gains of 2 or greater. The amplifier can be
operated single-ended by connecting either the (+) or (–)
inputs to +/REF, Pin 1. The voltage gain is set by the
resistors: (R
FB
+ R
G
)/R
G
.
The primary usefulness of the LT1193 is in converting
high speed differential signals to a single-ended output.
The amplifier has common mode rejection beyond 50MHz
U
W
U W
LT1193 • TPC22
Slew Rate vs Temperature
4
Output Voltage Step
vs Settling Time, A
V
= 2
V
S
=
±5V
T
A
= 25°C
R
L
= 1k
10mV
2
700
600
500
+SLEW RATE
0
V
S
=
±5V
400 T
A
= 25°C
R
L
= 1k
V
O
=
±2V
300
–50 –25
0
25
50
75
TEMPERATURE (°C)
–2
10mV
–4
100
125
40
50
60
70
80
SETTLING TIME (ns)
90
100
LT1193 • TPC20
LT1193 • TPC21
Small-Signal Transient Response
Small-Signal Transient Response
LT1193 • TPC23
LT1193 • TPC24
A
V
= –10, SMALL-SIGNAL RISE TIME = 43ns
A
V
= 2, R
FB
= 300Ω, R
G
= 300Ω,
OVERSHOOT = 25%, RISE TIME = 4.7ns
U U
and a full-power bandwidth of 40MHz at 4V
P-P
. Like the
single-ended case, the differential voltage gain is set by the
external resistors: (R
FB
+ R
G
)/R
G
. The maximum input
differential signal for which the output will respond is
approximately
±1.3V.
Power Supply Bypassing
The LT1193 is quite tolerant of power supply bypassing.
In some applications a 0.1µF ceramic disc capacitor
placed 1/2 inch from the amplifier is all that is required. A
scope photo of the amplifier output with no supply by-
passing is used to demonstrate this bypassing tolerance,
R
L
= 1k.
1193fb
7
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