Vco Configuration; Ev-Adf4159Eb1Z; Ev-Adf4159Eb3Z - Analog Devices EV-ADF4159EB1Z User Manual

Evaluation Board User Guide

VCO CONFIGURATION

EV-ADF4159EB1Z

The EV-ADF4159EB1Z evaluation board has a MACOM VCO
(MAOC-009269) with a range of 11.4 GHz to 12.8 GHz installed.
The RFOUT signal is connected to the EXT_VCOOUT SMA.
The RFOUT/2 signal of the VCO is fed back to the
PLL; therefore, when the VCO outputs 12 GHz, the
locked at 6 GHz.
For optimum performance, ensure that the components values
are as described in Table 2.
Table 2. Component Values for EV-ADF4159EB1Z
Component
R73
C29
R31, R34, R51, R62, R68, R70,
R71, R72 (Bottom Layer)
C40, C62, C63, C64, C65, C66,
C70, C71, C75, C76
L3, L4
1 DNP is do not populate.
Terminate the VCO/2 SMA with 50 Ω..
ADF4159
ADF4159
Value 1
0 Ω
100 pF
DNP
DNP
DNP

EV-ADF4159EB3Z

The EV-ADF4159EB3Z evaluation board does not have a VCO
installed. The board is configured for use with an external VCO
board. Connect an external VCO to the evaluation board using
SMA cables. There are two configuration options:
is
•
The VCO control voltage can be connected to the VTUNE
SMA, and the VCO RFOUT signal can be connected to the
VCO/2 SMA. This configuration uses the on-board loop filter.
•
The CPOUT SMA can be used to connect the
charge pump output to an external loop filter. Connect the
VCO RFOUT signal to the VCO/2 SMA to feed the signal
back into the ADF4159.
For optimum performance, ensure that the component values
are as shown in Table 3.
Table 3. Component Values for EV-ADF4159EB3Z
Component
R34
R31
C29
1 DNP is do not populate.
Rev. A | Page 5 of 16
UG-383
ADF4159
Value
1
50 Ω
DNP
DNP