LT1229 Datasheet, PDF (1/12 Pages) Linear Technology – Dual and Quad 100MHz Current Feedback Amplifiers

FEATURES
s _{100MHz Bandwidth}
s _{1000V/µs Slew Rate}
s _{Low Cost}
s _{30mA Output Drive Current}
s _{0.04% Differential Gain}
s _{0.1° Differential Phase}
s _{High Input Impedance: 25MΩ, 3pF}
s _{Wide Supply Range: ±2V to ±15V}
s _{Low Supply Current: 6mA Per Amplifier}
s _{Inputs Common Mode to Within 1.5V of Supplies}
s _{Outputs Swing Within 0.8V of Supplies}
APPLICATI S
s _{Video Instrumentation Amplifiers}
s _{Cable Drivers}
s _{RGB Amplifiers}
s _{Test Equipment Amplifiers}
LT1229/LT1230
Dual and Quad 100MHz
Current Feedback Amplifiers
DESCRIPTIO
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.
TYPICAL APPLICATI
Video Loop Through Amplifier
R_G1
3.01k
R_F1
750Ω
R_G2
187Ω
R_F2
750Ω
–
1/2
3.01k V_IN– LT1229
+
12.1k
3.01k ^VIN+
–
1/2
LT1229
+
V_OUT
12.1k
1% RESISTORS
WORST CASE CMRR = 22dB
TYPICALLY = 38dB
BNC INPUTS
HIGH INPUT RESISTANCE DOES NOT LOAD CABLE EVEN
WHEN POWER IS OFF
V_OUT = G (V_IN+ – V_IN–)
R_F1 = R_F2
R_G1 = (G – 1) R_F2
R_G2 =
R_F2
G–1
TRIM CMRR WITH R_G1
LT1229 • TA01
Loop Through Amplifier Frequency
Response
10
0
NORMAL SIGNAL
–10
–20
–30
–40
COMMON-MODE SIGNAL
–50
–60
10 100
1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
LT1229 • TA02
1