LT1254 Linear Technology Corporation, LT1254 Datasheet

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LT1254

Manufacturer Part Number
LT1254
Description
Low Cost Dual And Quad Video Amplifiers
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURE
A
TYPICAL
PPLICATI
Low Cost
Current Feedback Amplifiers
Differential Gain: 0.03%, R
Differential Phase: 0.28 , R
Flat to 30MHz, 0.1dB
90MHz Bandwidth on 5V
Wide Supply Range: 2V(4V) to 14V(28V)
Low Power: 60mW per Amplifier at 5V
RGB Cable Drivers
Composite Video Cable Drivers
Gain Blocks in IF Stages
V
IN
A
AT AMPLIFIER OUTPUT.
6dB LESS AT V
V
R
620
G
= 1 +
S
A
+
1/2 LT1253
R
O
R
PPLICATI
620
G
F
R
–5V
F
5V
U
OUT
BW = 90MHz
S
.
L
L
75
O
= 150 , V
= 150 , V
U
75
LT1253/54 • TA01
75
CABLE
V
S
OUT
S
= 5V
= 5V
D
The LT1253 is a low cost dual current feedback amplifier
for video applications. The LT1254 is a quad version of the
LT1253. The amplifiers are completely isolated except for
the power supply pins and therefore have excellent isola-
tion, over 94dB at 5MHz. Dual and quad amplifiers signifi-
cantly reduce costs compared with singles; the number of
insertions is reduced and fewer supply bypass capacitors
are required. In addition, these duals and quads cost less
per amplifier than single video amplifiers.
The LT1253/LT1254 amplifiers are ideal for driving low
impedance loads such as cables and filters. The wide
bandwidth and high slew rate of these amplifiers make
driving RGB signals between PCs and workstations easy.
The excellent linearity of these amplifiers makes them
ideal for composite video.
The LT1253 is available in 8-pin DIPs and the S8 surface
mount package. The LT1254 is available in 14-pin DIPs
and the S14 surface mount package. Both parts have the
industry standard dual and quad op amp pin out. For
higher performance, see the LT1229/LT1230.
Low Cost Dual and Quad
ESCRIPTIO
V
A
R
V
S
V
L
O
= 5V
= 2
= 150
= 1V
Transient Response
U
Video Amplifiers
LT1253/LT1254
LT1253/54 • TA02
1

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LT1254 Summary of contents

Page 1

... OUT Low Cost Dual and Quad D ESCRIPTIO The LT1253 is a low cost dual current feedback amplifier for video applications. The LT1254 is a quad version of the = 5V LT1253. The amplifiers are completely isolated except for the power supply pins and therefore have excellent isola- S tion, over 94dB at 5MHz ...

Page 2

... LT1253/LT1254 BSOLUTE – Total Supply Voltage ( ............................. 28V Input Current ..................................................... 15mA Output Short-Circuit Duration (Note 1) ........ Continuous Operating Temperature Range LT1253C, LT1254C................................. PACKAGE/ORDER I FOR ATIO TOP VIEW + OUT – OUT + – – ...

Page 3

... CONDITIONS V = 12V 5V OUT LT1253CN8: T LT1253CS8: T LT1254CN: T and power A LT1254CS: T Small Signal R R – 3dB BW (MHz 1100 None 270 1000 None 204 750 150 110 768 768 89 715 715 ...

Page 4

... LT1253/LT1254 W U TYPICAL PERFOR A Supply Current vs Supply Voltage –55°C 7 25° 125°C 4 175° SUPPLY VOLTAGE (±V) LT1253/54 • TPC01 Settling Time to 10mV vs Output Step 10 NONINVERTING INVERTING ±12V ...

Page 5

... LT1253/54 • TPC12 –20 –40 24 –60 23 –80 22 –100 21 –120 20 –140 19 –160 18 –180 17 –200 16 100M 1G 1M LT1253/54 • TPC14 LT1253/LT1254 5V Frequency Response 0 –20 –40 PHASE –60 –80 –100 GAIN –120 –140 V = ±5V S –160 150 L –180 R = 787 F –200 10M 100M ...

Page 6

... IC due to the load. The quiescent supply current of the LT1253/LT1254 has a strong nega- tive temperature coefficient. The supply current of each amplifier at 150 C is less than 7mA and typically is only 4 ...

Page 7

... U U APPLICATIO S I FOR ATIO As a guideline to help in the selection of the LT1253/ LT1254, the following table describes the maximum sup- ply voltage that can be used with each part based on the following assumptions: 1. The maximum ambient The load is a double-terminated video cable, 150 . ...

Page 8

... LT1253/LT1254 PACKAGE DESCRIPTIO 0.300 – 0.325 (7.620 – 8.255) 0.015 (0.380) MIN 0.130 ± 0.005 (3.302 ± 0.127) 0.009 – 0.015 (0.229 – 0.381) +0.025 0.325 –0.015 0.075 ± 0.015 +0.635 (1.905 ± 0.381) 8.255 –0.381 0.010 – 0.020 45 (0.254 – ...

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