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參數(shù)資料
| 型號(hào)： | EVAL-ADF5000EB2Z |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR ADF5000 |
| 設(shè)計(jì)資源： | ADF500x Gerber Files |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | * |
ADF5000
Data Sheet
Rev. A | Page 8 of 12
APPLICATION CIRCUIT
The ADF5000 can be connected either single-ended or differ-
entially to any of the Analog Devices PLL family of ICs. It is
recommended that a differential connection be used for best
performance and to achieve maximum power transfer. The
application circuit shown in Figure 10 shows the ADF5000
used as the RF prescaler in a microwave 12 GHz PLL loop. The
ADF5000 divides the 12 GHz RF signal down to 6 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 configuration, in turn, 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 such as the ADP150 can be used to power the
resistor divider network or the +IN A pin directly.
ADF5000
PRESCALER
VDD1
RFOUT
VDD2
ADF4156
PLL
RFINA
RFINB
GND
10pF
0.1F
CP
820pF
220
330
1.8nF
47nF
1k
1.8nF
MICROWAVE
VCO
RFOUT
VTUNE
RFIN
37
150
1F
VP/2
18
6dB ATTENUATION PAD
18
12GHz OUT
DECOUPLING
INTEGRATED
OP184
OP AMP
09129-
010
Figure 10. ADF5000 Used as the RF Prescaler in a Microwave 12 GHz PLL Loop
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