Evaluation Board Hardware; Transation Loop Synthesizer; Power Supplies; Jumpers - Analog Devices EVAL-CN0369SDPZ User Manual

UG-806

EVALUATION BOARD HARDWARE

TRANSATION LOOP SYNTHESIZER

The translation loop synthesizer (also known as an offset loop) as
the name implies, translates the lower 100 MHz reference freq-
uency of the ADF4002 phase locked loop (PLL) up to a higher
frequency range of 5.0 GHz to 5.4 GHz, as determined by the
frequency of the local oscillator (LO). Figure 2 shows a translation
loop evaluation setup using the EVAL-CN0369SDPZ.

POWER SUPPLIES

The user must apply 5.5 V to the VSUPPLY_5V5 power
connectors (4 mm banana connectors) and +12 V to the SMA
connector labeled +12VOLTS. The POWER on-board LED
indicates when the EVAL-CN0369SDPZ

JUMPERS

Table 1 shows the required positions for Jumper LK1 and
Jumper LK2 for normal operation.
Table 1. Jumper Positions
Jumper Position
LK1 Inserted
LK2 B—normal operation
A—hardware power-down
Jumper LK1 inserted enables the LOCK DETECT on-board LED.

RF OUTPUTS

The radio frequency (RF) output (VCO/2) and the fundamental
VCO output (EXT_VCOOUT1) are ac-coupled to VCO/2 and
EXT_VCOOUT1 SMA connectors, respectively. Set the RF
output coupling to the spectrum analyzer must be set to 50 Ω.
ACTIVE LOOP FILTER AND CHARGE PUMP
CURRENT
The default active loop filter is set to 1.1 MHz. Using a charge
pump setting of 5 mA is recommended.
is powered.
Rev. 0 | Page 4 of 8
EVAL-CN0369SDPZ User Guide

REFERENCE SOURCE AND FINE TUNING

An external reference using the REFIN SMA is the default
reference source and fine tuning for the EVAL-CN0369SDPZ,
provided by the ADF4355-2. To evaluate the EVAL-CN0369SDPZ,
initially program the EV-ADF4355-2SD1Z
RF output frequency. Achieve fine tuning of the translation loop
by changing the EV-ADF4355-2SD1Z
tally. A loop bandwidth of 100 kHz is recommended to allow the
ADF4355-2 to provide the fine tuning required. Insert a low pass
filter between the RFOUTB+ SMA connector of the
2SD1Z and the REFIN SMA connector of the
to filter the harmonics created by the output dividers. Terminate
the unused RFOUTB− SMA connector on the
2SD1Z in 50 Ω.
The RFOUTBx SMA connector gives higher output power in
comparison to RFOUTAx for lower output frequencies as it uses
a higher value of pull-up inductor. Refer to the
2SD1Z user guide for details on evaluation board set-up and
programming.

RFIN AND RF_MIXER AND COURSE TUNING

The ADL5801-EVALZ mixer evaluation board and a low noise
signal generator provides the translation loop coarse tuning
requirement.
Connect the low noise signal generator to the LO input of the
ADL5801-EVALZ. Connect the RF_MIXER SMA connector
from the EVAL-CN0369SDPZ
EVALZ. Connect the intermediate frequency (IF) output of the
ADL5801-EVALZ to the RFIN SMA connector of the
CN0369SDPZ via a 400 MHz low pass filter. Consult the
data sheet for details on using and connecting the
EVALZ evaluation board.
Refer to the CN-0369 for a block diagram of the test setup of
the EVAL-CN0369SDPZ, EV-ADF4355-2SD1Z, and
EVALZ.
To evaluate the EVAL-CN0369SDPZ, initially program the
signal generator to output 5.2 GHz with a power level of 0 dBm.
Achieve coarse tuning of the translation loop by changing the
output of the signal generator in increments of 100 MHz from
5.3 GHz to 4.9 GHz.
to generate 100 MHz
output frequency incremen-
EV-ADF4355-
EVAL-CN0369SDPZ
EV-ADF4355-
EV-ADF4355-
to the RF input of the ADL5801-
EVAL-
ADL5801
ADL5801-
ADL5801-