1

FEATURES

DESCRIPTION

APPLICATIONS

75W

75W

75W

75W

RGB

Channel0

75W

75W

75W

RGB

Channel1

75W

75W

RGB

Out

+5V

-5V

EN

Channel

Select

OPA3875

(Patented)

RGBSwitching

OPA3875

www.ti.com ............................................................................................................................................ SBOS341D – DECEMBER 2006 – REVISED AUGUST 2008

Triple 2:1 High-Speed Video Multiplexer

2

• 700MHz SMALL-SIGNAL BANDWIDTH

The OPA3875 offers a very wideband, 3-channel, 2:1

(AV = +2)

multiplexer in a small SSOP-16 package. Using only

11mA/ch, the OPA3875 provides three, gain of +2,

• 425MHz, 4V

PP BANDWIDTH

video amplifier channels with greater than 400MHz

• 0.1dB GAIN FLATNESS to 150MHz

large-signal bandwidth (4VPP). Gain accuracy and

• 4ns CHANNEL SWITCHING TIME

switching glitch are improved over earlier solutions

using

a

new

(patented)

input

stage

switching

• LOW SWITCHING GLITCH: 40mV

PP

approach. This technique uses current steering as the

• 3100V/µs SLEW RATE

input switch while maintaining an overall closed-loop

• 0.025%/0.025° DIFFERENTIAL GAIN, PHASE

design.

Gain

matching

between

each

of

the

3-channel pairs is also significantly improved using

• HIGH GAIN ACCURACY: 2.0V/V ±0.4%

this technique (<0.2% gain mismatch). With greater

than 700MHz small-signal bandwidth at a gain of 2,

the OPA3875 gives a typical 0.1dB gain flatness to

• RGB SWITCHING

greater than 150MHz.

• LCD PROJECTOR INPUT SELECT

System power may be reduced using the chip enable

• WORKSTATION GRAPHICS

feature for the OPA3875. Taking the chip enable line

• TRIPLE ADC INPUT MUX

high powers down the OPA3875 to less than 900

µA

• DROP-IN UPGRADE TO LT1675

total

supply

current.

Muxing

multiple

OPA3875

outputs together, then using the chip enable to select

which channels are active, increases the number of

possible inputs to the 3-channel outputs.

Where a single channel of the OPA3875 is required,

consider the OPA875.

OPA3875

SELECT

ENABLE

RED OUT GREEN OUT

BLUE OUT

1

0

R0

G0

B0

0

0

R1

G1

B1

X

1

Off

Off

Off

OPA3875 RELATED PRODUCTS

DESCRIPTION

OPA875

Single-Channel OPA3875

OPA4872

Quad 510MHz 4:1 Multiplexer

OPA3693

Triple 650MHz Video Buffer

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2008, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.