EVAL-ADF4118EB1 Datasheet, PDF (2/6 Pages) Analog Devices – WCDMA Evaluation Board For PLL Frequency Synthesizer

EVAL-ADF4118EB1
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 1.96GHz RF output, 1mA CP current, VCO190-
1960T, 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 ADF4118 V_DD and V_P, and for the VCO
supply. The default settings are 3V for the ADF4118 V_DD
and 5V for the ADF4118 V_P and for the VCO supply. It
is very important to note that the ADF4118 V_DD should
never exceed the ADF4118 V_P. This can damage the de-
vice.
All components necessary for LO generation are catered
for on-board. The 10MHz TCXO from Vectron provides
the necessary Reference Input. The PLL is made up of
the ADF4118, passive loop filter (20kHz) and the VCO
190-1960T 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 refer-
ence input. In this case, they need to insert SMA connec-
tors 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 ADF4118.
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