LT1229/LT1230
Dual and Quad 100MHz
Current Feedback Amplifiers
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DESCRIPTIO
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100MHz Bandwidth
1000V/µs Slew Rate
Low Cost
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).
30mA Output Drive Current
0.04% Differential Gain
0.1° Differential Phase
High Input Impedance: 25MΩ, 3pF
Wide Supply Range: ±2V to ±15V
Low Supply Current: 6mA Per Amplifier
Inputs Common Mode to Within 1.5V of Supplies
Outputs Swing Within 0.8V of Supplies
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.
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PPLICATI
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Video Instrumentation Amplifiers
Cable Drivers
The LT1229/LT1230 are manufactured on Linear
Technology’sproprietarycomplementarybipolarprocess.
For a single amplifier like these see the LT1227 and for
better DC accuracy see the LT1223.
RGB Amplifiers
Test Equipment Amplifiers
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TYPICAL APPLICATI
Loop Through Amplifier Frequency
Response
Video Loop Through Amplifier
10
R
187Ω
R
3.01k
R
750Ω
R
F2
750Ω
G2
G1
F1
0
NORMAL SIGNAL
–10
–20
–30
–
–
1/2
LT1229
1/2
LT1229
V
OUT
V
+
IN
V
–
3.01k
3.01k
IN
+
+
–40
1% RESISTORS
WORST CASE CMRR = 22dB
TYPICALLY = 38dB
COMMON-MODE SIGNAL
12.1k
12.1k
–50
–60
V
R
= G (V
+
– V
F2
–
)
IN
OUT
IN
10 100
1k 10k 100k 1M 10M 100M
= R
F1
F2
BNC INPUTS
R
= (G – 1) R
FREQUENCY (Hz)
G1
LT1229 • TA02
R
G – 1
HIGH INPUT RESISTANCE DOES NOT LOAD CABLE EVEN
WHEN POWER IS OFF
F2
R
=
G2
TRIM CMRR WITH R
G1
LT1229 • TA01
1