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AD5539 Datasheet(PDF) 14 Page - Analog Devices

Part No. AD5539
Description  Ultrahigh Frequency Operational Amplifier
Download  16 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com

AD5539 Datasheet(HTML) 14 Page - Analog Devices

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Figure 43. A Simulated Ideal Test Circuit Error Signal
Hence, the gain is unity at VX = +2 V. Since VX can overrange
to +3.3 V, the maximum gain in this configuration is about
4.3 dB. (Note: If Pin 9 of the AD539 is grounded, rather than
connected to the output of the 5539N, the maximum gain be-
comes 10 dB.)
The bandwidth of this circuit is over 50 MHz at full gain, and is
not substantially affected at lower gains. Of course, when VX is
zero (or slightly negative, to override the residual input offset)
there is still a small amount of capacitive feedthrough at high
frequencies; therefore, extreme care is needed in laying out the
PC board to minimize this effect. Also, for small values of VX,
the combination of this feedthrough with the multiplier output
can cause a dip in the response where they are out of phase.
Figure 45 shows the ac response from the noninverting input,
with the response from the inverting input, VY2, essentially iden-
tical. Test conditions: VY1 = 0.5 V rms for values of VX from
+10 mV to +3.16 V; this is with a 75
Ω load on the output. The
feedthrough at VX = –10 mV is also shown.
Figure 45. AC Response of the VCA at Different Gains
VY = 0.5 V RMS
Figure 42 shows the oscilloscope response of the generator
alone, set up to simulate the ideal test circuit error signal
(Figure 43).
Figure 42. The Oscilloscope Response Alone Directly
Driven by the Test Generator. Vertical Scale: 5 ns/div.;
Horizontal Scale: 500
Figure 44 is a circuit for a 50 MHz voltage-controlled amplifier
(VCA) suitable for use in high quality video-speed applications.
This circuit uses the AD5539 as an output amplifier for the
AD539, a high bandwidth multiplier. The outputs from the two
signal channels of the AD539 are applied to the op amp in a
subtracting configuration. This connection has two main advan-
tages: first, it results in better rejection of the control voltage,
particularly when over-driven (VX < 0 or VX > 3.3 V). Secondly,
it provides a choice of either noninverting or inverting responses,
using either input VY1 or VY2, respectively. In this circuit, the
output of the op amp will equal:
X VY 1– VY 2
for VX > 0
Figure 44. A Wide Bandwidth Voltage-Controlled Amplifier

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