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LT1193CN8#PBF

P1-P3P4-P6P7-P9P10-P12
7
LT1193
1193fb
TEMPERATURE (°C)
–50
300
SLEW RATE (V/µs)
500
700
800
–25 125
LT1193 • TPC20
0 25 50 75 100
V
S
= ±5V
T
A
= 25°C
R
L
= 1k
V
O
= ±2V
900
600
400
+SLEW RATE
–SLEW RATE
SETTLING TIME (ns)
40
–4
OUTPUT VOLTAGE STEP (V)
–2
2
4
50 100
LT1193 • TPC21
60 70 80 90
V
S
= ±5V
T
A
= 25°C
R
L
= 1k
0
10mV
10mV
LOAD RESISTANCE (Ω)
10
–5
OUTPUT VOLTAGE SWING (V)
–3
1
5
100 1000
LT1193 • TPC19
V
S
= ±5V
3
–1
T
A
= –55°C
T
A
= 25°C
T
A
= 125°C
T
A
= 125°C
T
A
= –55°C, 25°C
Large-Signal Transient Response
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Output Voltage Swing
vs Load Resistance
Slew Rate vs Temperature
Output Voltage Step
vs Settling Time, A
V
= 2
Small-Signal Transient Response Small-Signal Transient Response
LT1193 • TPC22
A
V
= 2, R
L
= 150Ω, R
FB
= 300Ω, R
G
= 300Ω
LT1193 • TPC23
A
V
= –10, SMALL-SIGNAL RISE TIME = 43ns
LT1193 • TPC24
A
V
= 2, R
FB
= 300Ω, R
G
= 300Ω,
OVERSHOOT = 25%, RISE TIME = 4.7ns
APPLICATIO S I FOR ATIO
WUUU
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
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.
8
LT1193
1193fb
V
+
7
6
LT1193
V
–
4
1
8
OUT
V
+
3
–
2
V
IN
SHDN
5
A
V
= –
R
FB
+ R
G
R
G
A
V
= +
R
FB
+ R
G
R
G
R
FB
7
6
LT1193
4
1
8
V
OUT
+
3
–
2
V
INDIFF
SHDN SHDN
5
V
O
= (V
INDIFF
+ V
IN
)
R
FB
+ R
G
R
G
R
FB
+ R
G
R
G
R
FB
R
G
R
FB
LT1193 • TA03
7
6
LT1193
4
+/REF
1
–/FB
8
V
OUT
+
3
–
2
5
V
O
=
R
FB
7
6
LT1193
4
1
8
V
OUT
+
3
–
2
V
IN
SHDN
5
R
FB
V
IN
V
IN
(
(
V
INDIFF
–V
IN
(
(
+/REF
–/FB
+/REF
–/FB
+/REF
–/FB
R
G
R
G
V
INDIFF
R
G
R
G
V
+
V
–
V
+
V
–
V
+
V
–
APPLICATIO S I FOR ATIO
WUUU
In many applications and those requiring good settling
time it is important to use multiple bypass capacitors. A
0.1µF ceramic disc in parallel with a 4.7µF tantalum is
recommended. Two oscilloscope photos with different
bypass conditions are used to illustrate the settling time
characteristics of the amplifier. Note that although the
output waveform looks acceptable at 1V/DIV, when ampli-
fied to 10mV/DIV the settling time to 10mV is 347ns for the
0.1µF bypass; the time drops to 96ns with multiple bypass
capacitors.
Operating With Low Closed-Loop Gains
The LT1193 has been optimized for closed-loop gains of
2 or greater; the frequency response illustrates the ob-
tainable closed-loop bandwidths. For a closed-loop gain
of 2 the response peaks about 2dB. Peaking can be
minimized by keeping the feedback elements below 1kΩ,
and can be eliminated by placing a capacitor across the
feedback resistor, (feedback zero). This peaking shows
up as time domain overshoot of about 40%. With the
feedback capacitor it is eliminated.
Cable Terminations
The LT1193 video difference amplifier has been optimized
as a low cost cable driver. The ±50mA guaranteed output
current enables the LT1193 to easily deliver 7.5V
P-P
into
No Supply Bypass Capacitors
LT1192 • TA04
A
V
= 10, IN DEMO BOARD, R
L
= 1k
LT1192 • TA05
SETTLING TIME TO 10mV, A
V
= 2
SUPPLY BYPASS CAPACITORS = 0.1µF
V
OUT
1V/DIV
0V
LT1192 • TA06
SETTLING TIME TO 10mV, A
V
= 2
SUPPLY BYPASS CAPACITORS = 0.1µF + 4.7µF TANTALUM
V
OUT
1V/DIV
0V
Settling Time Poor Bypass
Settling Time Good Bypass
0V
0V
V
OUT
10mV/DIV
V
OUT
10mV/DIV
9
LT1193
1193fb
Small-Signal Transient Response
Closed-Loop Voltage Gain vs Frequency
FREQUENCY (Hz)
CLOSED-LOOP VOLTAGE GAIN (dB)
10
LT1193 • TA08
100M10M1M100k
8
6
0
2
4
C
FB
= 0pF
C
FB
= 5pF
C
FB
= 10pF
C
FB
= 15pF
V
S
= ±5V
T
A
= 25°C
A
V
= 2
R
FB
= 300Ω
R
G
= 300Ω
Closed-Loop Voltage Gain vs Frequency
FREQUENCY (Hz)
CLOSED-LOOP VOLTAGE GAIN (dB)
25
LT1193 • TA07
100M10M1M100k
V
S
= ±5V
T
A
= 25°C
A
V
= 10
15
5
–5
A
V
= 5
A
V
= 3
A
V
= 2
Small-Signal Transient Response
APPLICATIO S I FOR ATIO
WUUU
LT1193 • TA09
A
V
= 2, OVERSHOOT = 40%, R
FB
= 1k, R
G
= 1k
LT1193 • TA10
A
V
= 2 WITH 8pF FEEDBACK CAPACITOR
RISE TIME = 3.75ns, 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.
FREQUENCY (Hz)
CLOSED LOOP VOLTAGE GAIN (dB)
8
LT1193 • TA11
100M10M1M100k
6
4
0
2
–2
–4
–6
A
V
= 2
R
FB
= 300Ω
R
G
= 100Ω
C
FB
= 0pF
A
V
= 1
R
FB
= 300Ω
R
G
= 300Ω
C
FB
= 10pF
+
–
–
+
R
FB
5V
7
6
LT1193
–5V
4
3
1
2
8
R
G
75Ω
75Ω
C
ABL
E
C
FB
Closed-Loop Voltage Gain vs Frequency
Double Terminated Cable Driver
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
P1-P3P4-P6P7-P9P10-P12

LT1193CN8#PBF

Mfr. #:
Buy LT1193CN8#PBF
Manufacturer:
Analog Devices Inc.
Description:
Video Amplifiers Adj Gain Video Difference Amp
Lifecycle:
New from this manufacturer.
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