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AD8350 Folha de dados(PDF) 8 Page - Analog Devices

Nome de Peças AD8350
Descrição Electrónicos  Low Distortion 1.0 GHz Differential Amplifier
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

AD8350 Folha de dados(HTML) 8 Page - Analog Devices

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REV. 0
AD8350
–8–
APPLICATIONS
Using the AD8350
Figure 27 shows the basic connections for operating the AD8350.
A single supply in the range +5 V to +10 V is required. The
power supply pin should be decoupled using a 0.1
µF capacitor.
The ENBL pin is tied to the positive supply or to +5 V (when
VCC = +10 V) for normal operation and should be pulled to
ground to put the device in sleep mode. Both the inputs and the
outputs have dc bias levels at midsupply and should be ac-coupled.
Also shown, in Figure 27, are the impedance balancing require-
ments, either resistive or reactive, of the input and output. With
an input and output impedance of 200
Ω, the AD8350 should
be driven by a 200
Ω source and loaded by a 200 Ω impedance.
A reactive match can also be implemented.
Figure 28 shows how the AD8350 can be driven by a single-
ended source. The unused input should be ac-coupled to
ground. When driven single-ended, there will be a slight imbal-
ance in the differential output voltages. This will cause an in-
crease in the second order harmonic distortion (at 50 MHz,
with VCC = +10 V and VOUT = 1 V p-p, –59 dBc was measured
for the second harmonic on AD8350-15).
8
7
6
5
1
2
3
4
AD8350
ENBL (+5V)
+VS (+5V TO +10V)
C5
0.1 F
C4
0.001 F
C3
0.001 F
LOAD
Z = 200
C2
0.001 F
C1
0.001 F
SOURCE
Z = 100
Z = 100
Figure 27. Basic Connections for Differential Drive
8
7
6
5
1
2
3
4
AD8350
ENBL (+5V)
+VS (+5V TO +10V)
C5
0.1 F
C4
0.001 F
C3
0.001 F
LOAD
Z = 200
C2
0.001 F
SOURCE
Z = 200
C1
0.001 F
Figure 28. Basic Connections for Single-Ended Drive
Reactive Matching
In practical applications, the AD8350 will most likely be matched
using reactive matching components as shown in Figure 29.
Matching components can be calculated using a Smith Chart
and the AD8350’s S-Parameters (see Tables I and II) along
with those of the devices that are driving and loading it. The S-
Parameters in Tables I and II assume a differential source and
load impedance of 50
Ω. Because the load impedance on the
output of the AD8350 affects the input impedance, a simulta-
neous conjugate match must be performed to correctly match
both input and output.
8
7
6
5
1
2
3
4
AD8350
ENBL (+5V)
+VS (+5V TO +10V)
C2
0.1 F
C2
C2
C1
C1
L1
L2
Figure 29. Reactively Matching the Input and Output


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