Datasheet

1/4
OPA4830
V
OUT
750W625W
Video
Input
75W
75W
75 TransmissionLineW
V
OUT
75W
75W
V
OUT
75W
75W
75W
Highoutputcurrentdrivecapabilityallowsthree
back-terminated75 transmissionlinestobesimultaneouslydriven.W
4-CHANNEL DAC TRANSIMPEDANCE
1/4
OPA4830
High-Speed
DAC
V =I R
O D F
R
F
C
F
GBP GainBandwidth®
Product(Hz)fortheOPA4830.
C
D
I
D
I
D
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 a 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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Product Folder Link(s): OPA4830