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LT1189

Low Power Video Difference Amplifier

Linear Technology 

LT1189

Low Power

Video Difference Amplifier

FEATURES

s Differential or Single-Ended Gain Block (Adjustable)

s –3dB Bandwidth, AV = ± 10

s Slew Rate

35MHz

220V/µs

s Low Supply Current

13mA

s Output Current

± 20mA

s CMRR at 10MHz

48dB

s LT1193 Pin Out

s Low Cost

s Single 5V Operation

s Drives Cables Directly

s Output Shutdown

APPLICATI S

s Line Receivers

s Video Signal Processing

s Cable Drivers

s Tape and Disc Drive Systems

DESCRIPTIO

The LT1189 is a difference amplifier optimized for opera-

tion on ±5V, or a single 5V supply, and gain ≥ 10. This

versatile amplifier features uncommitted high input im-

pedance (+) and (–) inputs, and can be used in differential

or single-ended configurations. Additionally, a second set

of inputs give gain adjustment and DC control to the

difference amplifier.

The LT1189’s high slew rate, 220V/µs, wide bandwidth,

35MHz, and ±20mA output current require only 13mA of

supply current. The shutdown feature reduces the power

dissipation to a mere 15mW, and allows multiple amplifi-

ers to drive the same cable.

The LT1189 is a low power, gain of 10 stable version of the

popular LT1193, and is available in 8-pin miniDIPs and SO

packages. For lower gain applications see the LT1187

data sheet.

TYPICAL APPLICATI

Cable Sense Amplifier for Loop Through Connections

with DC Adjust

VIN

CABLE

VDC

5V

3

+

2

7

–

6

1

LT1189

+

8–

4

–5V

909Ω

VOUT

100Ω

LT1189 • TA01

Closed-Loop Gain vs Frequency

50

40

30

20

10

0

0.1

VS = ±5V

RL = 1k

1

10

FREQUENCY (MHz)

100

LT1189 • TA02

1

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