LT1398/LT1399/LT1399HV
Low Cost Dual and Triple
300MHz Current Feedback
Amplifiers with Shutdown
FEATURES
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DESCRIPTIO
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300MHz Bandwidth on
±
5V (A
V
= 1, 2 and –1)
0.1dB Gain Flatness: 150MHz (A
V
= 1, 2 and –1)
Completely Off in Shutdown, 0µA Supply Current
High Slew Rate: 800V/µs
Wide Supply Range:
±2V(4V)
to
±6V(12V)
(LT1398/LT1399)
±2V
(4V) to
±7.5V
(15V) (LT1399HV)
80mA Output Current
Low Supply Current: 4.6mA/Amplifier
Fast Turn-On Time: 30ns
Fast Turn-Off Time: 40ns
16-Pin Narrow SO/Narrow SSOP Packages
The LT
®
1399 and LT1399HV contain three independent
300MHz current feedback amplifiers, each with a shut-
down pin. The LT1399HV is a higher voltage version of the
LT1399. The LT1398 is a two amplifier version of the
LT1399.
The LT1398/LT1399 operate on all supplies from a single
4V to
±6V.
The LT1399HV operates on all supplies from 4V
to
±7.5V.
Each amplifier draws 4.6mA when active. When disabled
each amplifier draws zero supply current and its output be-
comes high impedance. The amplifiers turn on in only 30ns
and turn off in 40ns, making them ideal in spread spectrum
and portable equipment applications.
The LT1398/LT1399/LT1399HV are manufactured on Lin-
ear Technology’s proprietary complementary bipolar pro-
cess. The LT1399/LT1399HV are pin-for-pin upgrades to
the LT1260 optimized for use on
±5V/±7.5V
supplies.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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RGB Cable Drivers
LCD Drivers
Spread Spectrum Amplifiers
MUX Amplifiers
Composite Video Cable Drivers
Portable Equipment
TYPICAL APPLICATIO
A
V
IN A
R
G
200Ω
CHANNEL
SELECT
EN A
B C
3-Input Video MUX Cable Driver
Square Wave Response
97.6Ω
+
–
1/3 LT1399
R
F
324Ω
75Ω
CABLE
V
OUT
V
IN B
R
G
200Ω
+
–
EN B
97.6Ω
75Ω
OUTPUT
200mV/DIV
1/3 LT1399
R
F
324Ω
V
IN C
R
G
200Ω
+
–
EN C
97.6Ω
1399 TA01
R
L
= 100Ω
R
F
= R
G
= 324Ω
f = 10MHz
1/3 LT1399
R
F
324Ω
U
TIME (10ns/DIV)
1398/99 TA02
U
U
1
LINER [ LINEAR TECHNOLOGY ]
