1

LT1204

4-Input Video Multiplexer

with 75MHz Current

Feedback Amplifier

S

FEATURE

DESCRIPTIO

The LT

drive 75

Ω cables and easily expand into larger routing

systems. Wide bandwidth, high slew rate, and low differ-

ential gain and phase make the LT1204 ideal for broadcast

quality signal routing. Channel separation and disable

isolation are greater than 90dB up to 10MHz. The channel-

with a 50ns duration, making the transition imperceptible

on high quality monitors.

A unique feature of the LT1204 is its ability to expand into

larger routing matrices. This is accomplished by a patent

pending circuit that bootstraps the feedback resistors in

the disable condition, raising the true output impedance of

the circuit. The effect of this feature is to eliminate cable

misterminations in large systems.

The large input and output signal levels supported by the

LT1204 when operated on

±15V supplies make it ideal for

general purpose analog signal selection and multiplexing.

A shutdown feature reduces the supply current to 1.5mA.

All Hostile Crosstalk

Surface Mount PCB Measurements

FREQUENCY (MHz)

1

–120

–100

–80

–60

–40

10

100

1204 TA02

–20

s

0.1dB Gain Flatness > 30MHz

s

Channel Separation at 10MHz: 90dB

s

40mV Switching Transient, Input Referred

s

s

Channel-to-Channel Switching Time: 120ns

s

Easy to Expand for More Inputs

s

Large Input Range:

± 6V

s

s

0.06

s

High Slew Rate: 1000V/

µs

s

s

Wide Supply Range:

±5V to ±15V

S

APPLICATI

s

Broadcast Quality Video Multiplexing

s

Large Matrix Routing

s

Medical Imaging

s

Large Amplitude Signal Multiplexing

s

Programmable Gain Amplifiers

, LTC and LT are registered trademarks of Linear Technology Corporation.

APPLICATI

TYPICAL

–

+

CFA

75

Ω

1

2

75

Ω

3

4

75

Ω

5

6

75

Ω

7

8

+1

+1

+1

+1

16

14

13

12

11

10

15

9

LOGIC

FB

S/D

ENABLE

A1

A0

15V

–15V

1k

75

Ω

1k

8.2k

–15V

LT1204

6.8k

GND

GND

GND

REF

1204 TA01