Datasheet

APPLICATION INFORMATION
WIDEBAND VOLTAGE-FEEDBACK
1/4
OPA4830
V =+3V
S
V
OUT
53.6W
V
IN
2.26kW
1.13kW
R
L
150W
+V
S
3
6.8 Fm
+
0.1 Fm
0.1 Fm
R
F
750W
R
G
750W
+1V
+V /3
S
1/4
OPA4830
V =+5V
S
V
OUT
53.6W
V
IN
1.50kW
+V /2
S
1.50kW
R
L
150W
+V
S
2
6.8 Fm
+
0.1 Fm
0.1 Fm
R
F
750W
R
G
750W
2.5V
OPA4830
SBOS350A – DECEMBER 2006 – REVISED MAY 2008 .................................................................................................................................................... www.ti.com
Figure 73 shows the ac-coupled, gain of +2V/V
configuration used for the +3V Electrical
OPERATION
Characteristics and Typical Characteristics . For test
The OPA4830 is a unity-gain stable, very high-speed
purposes, the input impedance is set to 50 Ω with a
voltage-feedback op amp designed for single-supply
resistor to ground. Voltage swings reported in the
operation (+3V to +10V). The input stage supports
Electrical Characteristics are taken directly at the
input voltages below ground and to within 1.7V of the
input and output pins. For the circuit of Figure 73 , the
positive supply. The complementary common-emitter
total effective load on the output at high frequencies
output stage provides an output swing to within 25mV
is 150 Ω || 1500 Ω . The 1.13k Ω and 2.26k Ω resistors
of ground and the positive supply. The OPA4830 is
at the noninverting input provide the common-mode
compensated to provide stable operation with a wide
bias voltage. The parallel combination equals the dc
range of resistive loads.
resistance at the inverting input (R
F
), reducing the dc
output offset as a result of input bias current.
Figure 72 shows the ac-coupled, gain of +2V/V
configuration used for the +5V Electrical
Characteristics and Typical Characteristics . For test
purposes, the input impedance is set to 50 Ω with a
resistor to ground. Voltage swings reported in the
Electrical Characteristics are taken directly at the
input and output pins. For the circuit of Figure 72 , the
total effective load on the output at high frequencies
is 150 Ω || 1500 Ω . The 1.5k Ω resistors at the
noninverting input provide the common-mode bias
voltage. This parallel combination equals the dc
resistance at the inverting input (R
F
), reducing the dc
output offset because of input bias current.
Figure 73. AC-Coupled, G = +2V/V, +3V
Single-Supply Specification and Test Circuit
Figure 72. AC-Coupled, G = +2V/V, +5V
Single-Supply Specification and Test Circuit
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