EVAL-ADF7020DB1 Analog Devices Inc, EVAL-ADF7020DB1 Datasheet - Page 2

• Manufacturer Part Number: EVAL-ADF7020DB1
• Description: BOARD EVAL ADF7020 902-928MHZ
• Manufacturer: Analog Devices Inc

Specifications of EVAL-ADF7020DB1

• Module/board Type: Evaluation Board
• For Use With/related Products: ADF7020 928MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

EVAL-ADF7020-XDBX
HARDWARE DESCRIPTION
The RF module, which is plugged into the mother board,
consists of the ADF7020 or ADF7020-1 device, output
matching circuit optimized for operation in a certain frequency
band, harmonic filter, PLL loop filter, de-coupling and xtal.
This RF module provides a low-cost, optimally matched RF
reference design which you can use as a starting point for your
design. A low-cost BOM is achieved by using a 2-layer PCB, a
low-cost xtal, and a simple combined output matching circuit
which eliminates the need for an external switch.
There are two different versions of the daughter card, one
which uses a low-cost dielectric harmonic filter from Murata
the other which uses a standard LC harmonic filter. Gerber files
for both are available for download on the ADF7020 product
page. Schematics are shown in Figures 9 and 10. The DB1 and
DB2 boards use the dielectric filter while all other boards use
the LC filter.
The silk screen for the basic mother board is shown in Figure 4.
Figure 2. Dielectric Filter version – silkscreen
Figure 1: .LC Filter version-silkscreen
Rev. Pr C | Page 2 of 19
The mother board (MB) comes with a cable for connecting to
the printer port of a PC. The cable diagram is shown in Figure
5. The MB can be supplied directly with an external supply of
2.3V to 3.6V or a battery voltage from 3V to 9V by switching in
a regulator using jumper K3. There is an on-board
11.0592MHz AT crystal. The crystal combined with 33pF shunt
capacitors provide the low cost frequency reference for the local
oscillator.
The necessary SMA connectors are included to interface the
part to the measurement instrument (Normally a spectrum
analyzer in Tx mode and a RF signal generator in Rx mode).
Care should be taken to ensure that no DC level exists at the
ANTENNA SMA.
The parallel port has 5V voltage levels, so there is a voltage
divider to bring this down to levels acceptable to the ADF7020
/ADF7020-1 device.
Figure 3. . Mother Board Silkscreen – component side view
Figure 4. PC Cable Diagram
Preliminary Technical Data