ADF4150HVBCPZ AD [Analog Devices], ADF4150HVBCPZ Datasheet - Page 24

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

ADF4150HV
GENERATING THE HIGH VOLTAGE SUPPLY
It is possible to use a boost converter such as the Analog Devices
ADP1613
from a lower voltage rail without degrading PLL performance.
To minimize any switching noise feedthrough, ensure that
sufficient decoupling is placed close to the charge pump supply
pin (Pin 6). Care should be taken to use capacitors with the
appropriate voltage rating; for example, if using a boost converter
to generate a 20 V V
20 V or higher.
The design of the boost converter is simplified using the
ADP161x
ADP1613 product
example 5 V input to 20 V output design. To minimize voltage
ripple at the output of the converter stage, the Noise Filter
option is selected, and the Vout Ripple field is set to its
minimum value. The high voltage charge pump current draw is
2 mA maximum; therefore, a value of 10 mA is entered in the
Iout field to provide margin. When tested with the
evaluation board, this design showed no evident switching
spurs at the VCO output.
Excel-based design tool. This tool is available from the
to generate the high voltage charge pump supply
page. Figure 30 shows the user inputs for an
P
supply, use capacitors with a rating of
VDD1
RFIN
PRESCALER
ADF5001
VDD2
GND
10pF
RFOUT
RFOUT
150Ω
AC COUPLING INTEGRATED
0.1µF
6dB PAD
37Ω
ON ADF5001 DEVICE
150Ω
ADF4150HV
16GHz OUT
18Ω
Figure 29. 16 GHz Microwave PLL
18Ω
Rev. 0 | Page 24 of 28
18Ω
RF
RF
RFOUT
IN
IN
+
–
ADF4150HV
MICROWAVE
VCO
PLL
VTUNE
CP
OUT
Figure 30.
ADP161x
Designer Tool