參數(shù)資料
型號： EVAL-ADF4150HVEB1Z
廠商： Analog Devices Inc
文件頁數(shù)： 16/28頁
文件大?。?/td> 0K
描述： EVAL BOARD FOR ADF4150HV
標(biāo)準(zhǔn)包裝： 1
類型： 整數(shù) N 合成器（RF）
頻率： 3GHz
適用于相關(guān)產(chǎn)品： ADF4150HV
已供物品： 板
ADF4150HV
Rev. 0 | Page 23 of 28
APPLICATIONS INFORMATION
ULTRAWIDEBAND PLL
When paired with an octave tuning range VCO, the ADF4150HV
provides an ultrawideband PLL function using the on-board
RF dividers. With an octave tuning range at the fundamental
frequency, the RF dividers provide full frequency coverage with
no gaps down to much lower frequencies.
For example, using a 1 GHz to 2 GHz octave range VCO (such
as the Synergy DCYS100200-12), the user can obtain contiguous
output frequencies from 62.5 MHz to 2 GHz at the ADF4150HV
RF outputs, as shown in Figure 28. A broadband output match
is achieved using a 27 nH inductor in parallel with a 50 Ω resistor
(for more information, see the Output Matching section). With
such a wide output range, the same PLL hardware design can
generate different frequencies for each of the different hardware
platforms in the system.
MICROWAVE PLL
The ADF4150HV can be interfaced directly to a wide tuning
range microwave VCO without the need for an active filter.
Typically, most microwave VCOs have a maximum tuning range
of 15 V. In this case, set VP on the ADF4150HV to a value of
16 V or higher to ensure sufficient headroom in the charge
pump. An external prescaler, such as the ADF5001, is required
to divide down VCO frequencies that are above the maximum
RF input frequency of 3.0 GHz.
In the application circuit shown in Figure 29, the ADF5001
divides down the 16 GHz VCO signal to 4 GHz, which can then
be input directly into the ADF4150HV RF inputs. The ADF5001
can be connected either single-ended or differentially to the
ADF4150HV. For best performance and to achieve maximum
power transfer, it is recommended that a differential connection
be used.
RFOUT
VTUNE
150
SYNERGY DCYS100200-12
OCTAVE RANGE VCO
RFIN+
RFOUT–
RFOUT+
RFIN–
CPOUT
ADF4150HV
PLL
37
ZBIAS =
50||27nH
ZBIAS
VDD
RFOUT =
62.5MHz TO 2GHz
09
05
8-
0
26
Figure 28. Ultrawideband PLL Using the ADF4150HV and an Octave Tuning Range VCO
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