1

LT1227

140MHz Video Current

Feedback Amplifier

APPLICATI

TYPICAL

S

FEATURE

s

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: 14M

Ω, 3pF

s

Wide Supply Range:

±2V to ±15V

s

s

s

Inputs Common Mode to Within 1.5V of Supplies

s

Outputs Swing Within 0.8V of Supplies

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

or open drain logic and takes only 4

µs 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.

DESCRIPTIO

Video Cable Driver

Differential Gain and Phase

vs Supply Voltage

–

+

75

Ω

CABLE

75

Ω

1k

LT1227

75

Ω

= 1

1227 TA01

1k

s

Video Amplifiers

s

Cable Drivers

s

RGB Amplifiers

s

Test Equipment Amplifiers

s

50

Ω Buffers for Driving Mixers

S

APPLICATI

SUPPLY VOLTAGE (±V)

5

0.12

0.16

0.20

13

LT1227 • TA02

0.08

0.04

0

7

9

11

15

0.12

0.16

0.20

0.08

0.04

0

NTSC COMPOSITE

f = 3.58MHz

∆φ

∆G