EVAL-ADF411XEB1 Datasheet, PDF (2/6 Pages) Analog Devices – Evaluation Board For PLL Frequency Synthesizer

EVAL-ADF411XEB1
Hardware Description
The evaluation board comes with a cable for connecting to
the printer port of a PC. The silk screen and cable diagram for
the evaluation board are shown below. The board schematic is
shown on pages 3 and 4.
EVAL-ADF411X
EVAL-ADF421X
61
72
83
94
5
9 Way
Female D-Type
To
ADF411X
ADF421X
Evaluation
Board
1
Black - CLK 2
14
Brown - DATA ₃
15
Red - LE ₄
16
Orange - CE ₅
17
PC
White - GND
Yellow 6
18
19
7
20
8
21
9
Blue 10 ²²
23
11
24
12
Purple ₁₃
25
25 Way Male
D-Type
To
PC Printer Port
Figure 2. PC Cable Diagram
voltage is too low to sustain the required 3V or 5V for the
board supply.
Loop component values shown in the circuit diagram are
for 900MHz RF output, 5mA CP current, VCO190-
902T, 200kHz channel spacing and 20kHz loop band-
width.
Figure 1. Evaluation Board Silkscreen
The board is powered from a single 9V battery. The
power supply ciruitry allows the user to choose either 3V
or 5V for the ADF4113 V_DD and V_P, and for the VCO
supply. The default settings are 3V for the ADF411X V_DD
and 5V for the ADF411X V_P and for the VCO supply. It
is very important to note that the ADF4113 V_DD should
never exceed the ADF411X V_P. This can damage the de-
vice.
All components necessary for LO generation are catered
for on-board. The TCXO connector provides the neces-
sary Reference Input. The PLL is made up of the
ADF411X, passive loop filter and the VCO 190-XXXT
from Vari-L. The output is available at RFOUT through
a standard SMA connector. If the user wishes they may
use their own power supplies and reference input. In this
case, they need to insert SMA connectors to as shown on
the silkscreen and block diagram.
The AD7706 A/D converter is used to monitor the power
supply voltage and current consumption of the ADF411X.
This helps the user pick the optimum synthesizer settings for
power consumption and also provides an alert if the battery
–2–
REV.PrB 04/00