ADF4150HVBCPZ AD [Analog Devices], ADF4150HVBCPZ Datasheet - Page 23

• Manufacturer Part Number: ADF4150HVBCPZ
• Description: High Voltage, Fractional-N
• Manufacturer: AD [Analog Devices]

APPLICATIONS INFORMATION
ULTRAWIDEBAND PLL
When paired with an octave tuning range VCO, the
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
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.
150Ω
Figure 28. Ultrawideband PLL Using the
37Ω
150Ω
ADF4150HV
ADF4150HV
SYNERGY DCYS100200-12
RF
RF
RFOUT
OCTAVE RANGE VCO
IN
IN
+
–
ADF4150HV
Rev. 0 | Page 23 of 28
PLL
ADF4150HV
RF
RF
VTUNE
CP
OUT
OUT
OUT
+
–
MICROWAVE PLL
The
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 V
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
divides down the 16 GHz VCO signal to 4 GHz, which can then
be input directly into the
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.
and an Octave Tuning Range VCO
ADF4150HV
V
DD
Z
50Ω||27nH
BIAS
Z
BIAS
=
can be interfaced directly to a wide tuning
RF
62.5MHz TO 2GHz
OUT
ADF4150HV
P
on the
=
ADF4150HV
RF inputs. The
ADF4150HV
to a value of
ADF5001
ADF5001