LT1227 Datasheet, PDF (1/12 Pages) Linear Technology – 140MHz Video Current Feedback Amplifier

LT1227
140MHz Video Current
Feedback Amplifier
FEATURES
s _{140MHz Bandwidth: AV = 2, RL = 150Ω}
s _{1100V/µs Slew Rate}
s _{Low Cost}
s _{30mA Output Drive Current}
s _{0.01% Differential Gain}
s _{0.01° Differential Phase}
s _{High Input Impedance: 14MΩ, 3pF}
s _{Wide Supply Range: ±2V to ±15V}
s _{Shutdown Mode: IS < 250µA}
s _{Low Supply Current: IS = 10mA}
s _{Inputs Common Mode to Within 1.5V of Supplies}
s _{Outputs Swing Within 0.8V of Supplies}
APPLICATI S
s _{Video Amplifiers}
s _{Cable Drivers}
s _{RGB Amplifiers}
s _{Test Equipment Amplifiers}
s _{50Ω Buffers for Driving Mixers}
DESCRIPTIO
The LT1227 is a current feedback amplifier with wide
bandwidth and excellent video characteristics. The low
differential gain and phase, wide bandwidth, and 30mA
output drive current make the LT1227 well suited to drive
cables in video systems.
A shutdown feature switches the device into a high imped-
ance, low current mode, allowing multiple devices to be
connected in parallel and selected. Input to output isola-
tion in shutdown is 70dB at 10MHz for input amplitudes up
to 10V_P-P. The shutdown pin interfaces to open collector
or open drain logic and takes only 4µs to enable or disable.
The LT1227 comes in the industry standard pinout and
can upgrade the performance of many older products. For
a dual or quad version, see the LT1229/1230 data sheet.
The LT1227 is manufactured on Linear Technology’s
proprietary complementary bipolar process.
TYPICAL APPLICATI
Video Cable Driver
V_IN
+
75Ω
LT1227
–
R_F
1k
R_G
1k
V_OUT
V_IN
=1
75Ω
CABLE
V_OUT
75Ω
1227 TA01
Differential Gain and Phase
vs Supply Voltage
0.20
0.20
NTSC COMPOSITE
f = 3.58MHz
0.16
0.16
0.12
0.12
0.08
0.04
0
5
0.08
∆φ
0.04
∆G
0
7
9
11
13
15
SUPPLY VOLTAGE (±V)
LT1227 • TA02
1