LT1187 Linear Technology, LT1187 Datasheet

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LT1187

Manufacturer Part Number
LT1187
Description
Low Power Video Difference Amplifier
Manufacturer
Linear Technology
Datasheet

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FEATURE
A
TYPICAL
PPLICATI
Differential or Single-Ended Gain Block (Adjustable)
–3dB Bandwidth, A
Slew Rate
Low Supply Current
Output Current
CMRR at 10MHz
LT1193 Pin Compatible
Low Cost
Single 5V Operation
Drives Cables Directly
Output Shutdown
Line Receivers
Video Signal Processing
Cable Drivers
Tape and Disc Drive Systems
Cable Sense Amplifier for Loop Through Connections
CABLE
V
IN
A
S
V
O
PPLICATI
DC
U
V
with DC Adjust
S
3
2
1
8
1k
= 2
+
+
LT1187
–5V
5V
7
4
1k
O
U
6
LT1187 • TA01
V
OUT
165V/ s
50MHz
13mA
20mA
40dB
D
The LT1187 is a difference amplifier optimized for opera-
tion on 5V, or a single 5V supply, and gain 2. This
versatile amplifier features uncommitted high input im-
pedance (+) and (–) inputs, and can be used in differential
or single-ended configurations. Additionally, a second set
of inputs give gain adjustment and DC control to the
difference amplifier.
The LT1187’s high slew rate, 165V/ s, wide bandwidth,
50MHz, and 20mA output current require only 13mA of
supply current. The shutdown feature reduces the power
dissipation to a mere 15mW, and allows multiple amplifi-
ers to drive the same cable.
The LT1187 is a low power version of the popular LT1193,
and is available in 8-pin miniDIPs and SO packages. For
applications with gains of 10 or more, see the LT1189
data sheet.
ESCRIPTIO
Video Difference Amplifier
–10
40
30
20
10
0
0.1
Closed-Loop Gain vs Frequency
U
1
FREQUENCY (MHz)
10
Low Power
V
R
S
L
= ±5V
= 1k
LT1187 • TA02
100
LT1187
1

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LT1187 Summary of contents

Page 1

... The shutdown feature reduces the power dissipation to a mere 15mW, and allows multiple amplifi- ers to drive the same cable. The LT1187 is a low power version of the popular LT1193, and is available in 8-pin miniDIPs and SO packages. For applications with gains more, see the LT1189 data sheet ...

Page 2

... V ) ............................. 18V Differential Input Voltage ........................................ 6V Input Voltage .......................................................... V Output Short Circuit Duration (Note 1) ........ Continuous Operating Temperature Range LT1187M ..................................... – 150 C LT1187C............................................. Junction Temperature (Note 2) Plastic Package (CN8,CS8) ......................... 150 C Ceramic Package (CJ8,MJ8) ....................... 175 C Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec.)................ 300 C – ...

Page 3

... C 10pF, pin 5 REF L FB1 FB2 L LT1187M/C MIN TYP MAX 2.0 10 2.0 12 0.2 1.0 0.5 2.0 2.0 3.5 70 100 High 3.6 4.0 Low 0.15 0.4 130 5 0.8 1 1k, C 10pF, pin 5 open. L FB1 FB2 L LT1187M MIN TYP MAX 2.0 15 8.0 0.2 1.5 0.5 3.5 –2.5 3.5 70 100 60 85 3.7 4.0 6.6 7.0 6.4 6.8 0.2 1 0.8 1 UNITS UNITS MHz ...

Page 4

... N8 suffix) and are sample tested on every lot of the SO packaged parts (S8 suffix). Note 11: See Application section for shutdown at elevated temperatures. Do not operate shutdown above T and +V (pin 2 and 1k, C 10pF, pin 5 open. L FB1 FB2 L LT1187C MIN TYP MAX 2.0 12 9.0 0.2 1.5 0.5 3.5 – 2.5 3.5 70 100 ...

Page 5

... VOLTAGE (V) LT1187 • TPC05 Open-Loop Gain vs Temperature ± ± ± 500 –50 – 100 125 TEMPERATURE (°C) LT1187 • TPC08 LT1187 75 100 125 LT1187 • TPC03 LT1187 • TPC06 75 100 125 LT1187 • TPC09 5 ...

Page 6

... V ±SUPPLY VOLTAGE (V) LT1187 • TPC17 = – 55°C = 25° 125˚ LT1187 • TPC12 V = ± 25° 10M 100M LT1187 • TPC15 125°C 25°C –55°C 125°C 25°C –55° LT1187 • TPC18 ...

Page 7

... Output Voltage Step vs Settling Time ± 25° 10mV 2 0 –2 10mV – 4 100 125 SETTLING TIME (ns 180V LT1187 • TPC23 = 1k, OVERSHOOT = 25% FB LT1187 • TPC25 LT1187 80 90 100 LT1187 • TPC21 7 ...

Page 8

... LT1187 U U APPLICATIO S I FOR ATIO The primary use of the LT1187 is in converting high speed differential signals to a single-ended output. The LT1187 video difference amplifier has two uncommitted high input impedance (+) and (–) inputs. The amplifier has another set of inputs which can be used for reference and feed- back ...

Page 9

... WITH 8pF FEEDBACK CAPACITOR V Extending the Input Range Figure 1 shows a simplified schematic of the LT1187. In normal operation the REF pin 1 is grounded or taken offset control voltage and differential signals are ap- plied between pins 2 and 3. The input responds linearly 100M until all of the 345 A current flows through the 1.1k LT1187 • ...

Page 10

... Send Color Video Over Twisted-Pair With an LT1187 it is possible to send and receive color composite video signals more than 1000 feet on a low cost twisted-pair. A bidirectional “video bus” consists of the LT1195 op amp and the LT1187 video difference amplifier ...

Page 11

... 300 Multiburst Pattern Passed Through 1000 Feet of Twisted-Pair TRANSMIT LT1195 75 2 – – 6 LT1195 S – LT1187 – 300 1000pF R G 300 RECEIVE 1 LT1187 • AI11 LT1187 LT1187 • AI10 11 ...

Page 12

... LT1187 • SS 0.405 (10.287) 0.005 0.200 MAX (5.080) (0.127) MIN MAX 0.015 – 0.060 (0.381 – 1.524) ...

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