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LT1229/LT1230
Dual and Quad 100MHz
Current Feedback Amplifiers
D
U
ESCRIPTIO
S
FEATURE
The LT1229/LT1230 dual and quad 100MHz current feed-
back amplifiers are designed for maximum performance
in small packages. Using industry standard pinouts, the
dual is available in the 8-pin miniDIP and the 8-pin SO
package while the quad is in the 14-pin DIP and 14-pin SO.
The amplifiers are designed to operate on almost any
available supply voltage from 4V (
±
2V) to 30V (
±
15V).
These current feedback amplifiers have very high input
impedance and make excellent buffer amplifiers. They
maintain their wide bandwidth for almost all closed-loop
voltage gains. The amplifiers drive over 30mA of output
current and are optimized to drive low impedance loads,
such as cables, with excellent linearity at high frequencies.
The LT1229/LT1230 are manufactured on Linear
Technology’s proprietary complementary bipolar process.
For a single amplifier like these see the LT1227 and for
better DC accuracy see the LT1223.
I
100MHz Bandwidth
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1000V/
μ
s Slew Rate
I
Low Cost
I
30mA Output Drive Current
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0.04% Differential Gain
I
0.1
°
Differential Phase
I
High Input Impedance: 25M
, 3pF
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Wide Supply Range:
±
2V to
±
15V
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Low Supply Current: 6mA Per Amplifier
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Inputs Common Mode to Within 1.5V of Supplies
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Outputs Swing Within 0.8V of Supplies
U
S
A
O
PPLICATI
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Video Instrumentation Amplifiers
I
Cable Drivers
I
RGB Amplifiers
I
Test Equipment Amplifiers
U
A
O
PPLICATI
TYPICAL
–
+
V
OUT
LT1229 TA01
12.1k
R
F2
750
1% RESISTORS
WORST CASE CMRR = 22dB
TYPICALLY = 38dB
V
OUT
= G (V
IN+
– V
IN–
)
R
F1
= R
F2
R
G1
= (G – 1) R
F2
R
G2
=
TRIM CMRR WITH R
G1
HIGH INPUT RESISTANCE DOES NOT LOAD CABLE EVEN
WHEN POWER IS OFF
L1/2
R
F2
G – 1
R
G2
187
R
F1
750
R
3.01k
–
+
L1/2
3.01k
3.01k
12.1k
V
IN–
V
IN+
BNC INPUTS
Video Loop Through Amplifier
Loop Through Amplifier Frequency
Response
FREQUENCY (Hz)
10
–60
G
–50
–40
–30
–20
–10
10
100
1k
10k
100M
LT1229 TA02
100k
1M
10M
0
COMMON-MODE SIGNAL
NORMAL SIGNAL