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ADF5001 Folha de dados(PDF) 8 Page - Analog Devices

Nome de Peças ADF5001
Descrição Electrónicos  4 GHz to 18 GHz Divide-by-4 Prescaler
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
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ADF5001 Folha de dados(HTML) 8 Page - Analog Devices

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ADF5001
Rev. 0 | Page 8 of 12
APPLICATION CIRCUIT
The ADF5001 can be connected either single-ended or differen-
tially to any of the Analog Devices PLL family of ICs. It is recom-
mended to use a differential connection for best performance
and to achieve maximum power transfer. The application circuit
shown in Figure 10 shows the ADF5001 used as the RF prescaler
in a microwave 16 GHz PLL loop. The ADF5001 divides down
the 16 GHz RF signal to 4 GHz, which is input differentially
into the ADF4156 PLL. An active filter topology, using the
OP184 op amp, is used to provide the wide tuning ranges
typically required by microwave VCOs. The positive input pin of
the OP184 is biased at half the ADF4156 charge pump supply
(VP). This can be easily achieved using a simple resistor divider,
ensuring sufficient decoupling close to the +IN A pin of the
OP184. This then allows the use of a single positive supply for the
op amp. Alternatively, to optimize performance by ensuring a
clean bias voltage, a low noise regulator like the ADP150 can be
used to power the resistor divider network or the +IN A pin
directly.
ADF5001
PRESCALER
VDD1
RFOUT
RFOUTB
VDD2
ADF4156
PLL
RFINA
RFINB
GND
10pF
0.1µF
CP
820pF
220
330
1.8nF
47nF
1k
1.8nF
MICROWAVE
VCO
RFOUT
VTUNE
RFIN
37
150
150
1µF
VP/2
18
6dB PAD
18
16GHz OUT
DECOUPLING
INTEGRATED
OP184
OP AMP
Figure 10. ADF5001 Used as the RF Prescaler in a Microwave 16 GHz PLL Loop


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