OPA830 datasheet(30/45 Pages) TI

30 / 45 page

1/4

OPA4830

OUT

750W

625W

Video

Input

75W

TransmissionLine

OUT

75W

OUT

75W

Highoutputcurrentdrivecapabilityallowsthree

back-terminated75

transmissionlinestobesimultaneouslydriven.

4-CHANNEL DAC TRANSIMPEDANCE

1/4

OPA4830

High-Speed

DAC

V =I R

GBP

GainBandwidth

Product(Hz)fortheOPA4830.

OPA4830

SBOS350A – DECEMBER 2006 – REVISED MAY 2008.................................................................................................................................................... www.ti.com

Figure 86. Video Distribution Amplifier

AMPLIFIER

High-frequency Digital-to-Analog Converters (DACs)

require a low-distortion output amplifier to retain the

SFDR performance into real-world loads. Figure 87

illustrates

single-ended

output

drive

implementation. In this circuit, only one side of the

complementary output drive signal is used. The

diagram shows the signal output current connected

into the virtual ground-summing junction of the

OPA4830, which is set up as a transimpedance stage

or I-V converter. The unused current output of the

DAC is connected to ground. If the DAC requires its

outputs to be terminated to a compliance voltage

other than ground for operation, then the appropriate

voltage level may be applied to the noninverting input

of the OPA4830.

Figure 87. Wideband, Low-Distortion DAC

Transimpedance Amplifier

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OPA830 Datasheet(PDF) 30 Page - Texas Instruments

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