OPA4830 Datasheet, PDF (30/45 Pages) National Semiconductor (TI) – Quad, Low-Power, Single-Supply, Wideband Operational Amplifier

OPA4830
SBOS350A – DECEMBER 2006 – REVISED MAY 2008.................................................................................................................................................... www.ti.com
625W
750W
Video
Input
1/4
OPA4830
75W
75W Transmission Line
75W
75W
75W
75W
V_OUT
V_OUT
75W
High output current drive capability allows three
back-terminated 75W transmission lines to be simultaneously driven.
75W
V_OUT
Figure 86. Video Distribution Amplifier
4-CHANNEL DAC TRANSIMPEDANCE
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.
High-Speed
DAC
I_D
1/4
OPA4830
V_O = I_D R_F
R_F
C_F
C_D
GBP ® Gain Bandwidth
Product (Hz) for the OPA4830.
I_D
Figure 87. Wideband, Low-Distortion DAC
Transimpedance Amplifier
30
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