Triple Differential Driver

With Output Pull-Down

AD8133

Rev. 0

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© 2004 Analog Devices, Inc. All rights reserved.

FEATURES

Triple high speed fully differential driver

225 MHz −3 dB large signal bandwidth

Easily drives 1.4 V p-p video signal into source-terminated

100 Ω UTP cable

1600 V/µs slew rate

Fixed internal gain of 2

Internal common-mode feedback network

Output balance error −60 dB @ 50 MHz

Differential input and output

Differential-to-differential or single-ended-to-differential

operation

Adjustable output common-mode voltage

Output pull-down feature for line isolation

Low distortion: 64 dB SFDR @ 10 MHz on 5 V supply,

Low offset: 4 mV typical output referred on 5 V supply

Low power: 26 mA @ 5 V for three drivers

Wide supply voltage range: +5 V to ±5 V

Available in space-saving packaging: 4 mm × 4 mm LFCSP

APPLICATIONS

KVM (keyboard-video-mouse) networking

UTP (unshielded twisted pair) driving

Differential signal multiplexing

GENERAL DESCRIPTION

The AD8133 is a major advancement beyond using discrete

op amps for driving differential RGB signals over twisted pair

cable. The AD8133 is a triple, low cost differential or single-

ended input to differential output driver, and each amplifier has

a fixed gain of 2 to compensate for the attenuation of line ter-

mination resistors. The AD8133 is specifically designed for RGB

signals but can be used for any type of analog signals or high speed

data transmission. The AD8133 is capable of driving either Cate-

gory 5 unshielded twisted pair (UTP) cable or differential printed

circuit board transmission lines with minimal signal degradation.

The outputs of the AD8133 can be set to a low voltage state to

be used with series diodes for line isolation, allowing easy dif-

ferential multiplexing over the same twisted pair cable. The

AD8133 driver can be used in conjunction with the AD8129

and AD8130 differential receivers.

FUNCTIONAL BLOCK DIAGRAM

AD8133

OPD

1

–IN A

3

+IN A

4

–IN C

+IN C

18

17

16

15

14

–OUT A

6

–OUT C

13

24

23

22

21

20

19

7

8

9

10

11

12

A

B

C

Figure 1.

FREQUENCY (MHz)

0

–20

–10

–40

–30

–60

–50

–80

–70

–100

–90

1

10

100

500

∆V

∆V

Figure 2. Output Balance vs. Frequency

Manufactured on Analog Devices’ next generation XFCB bipo-

lar process, the AD8133 has a large signal bandwidth of

225 MHz and a slew rate of 1600 V/µs. The AD8133 has an

internal common-mode feedback feature that provides output

amplitude and phase matching that is balanced to −60 dB at

50 MHz, suppressing harmonics and minimizing radiated elec-

tromagnetic interference (EMI).

The output common-mode level is easily adjustable by applying

to transmit signals on the output common-mode voltages.

The AD8133 is available in a 24-lead LFCSP package and can

operate over the temperature range of −40°C to +85°C.