MAX3580EVKIT+ Maxim Integrated Products, MAX3580EVKIT+ Datasheet - Page 3

• Manufacturer Part Number: MAX3580EVKIT+
• Description: RF Modules & Development Tools MAX3580 EVAL KIT MAX3580 EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX3580EVKIT+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

On-board matching circuitry and a diplexer can be
placed at the paths of the MAX3580 inputs. For matching
a 50Ω source to a 75Ω input, place an impedance-
conversion resistor network using available component
layout footprints (i.e., R148 and R146). Note that the
input power to the device must be adjusted to account
for the power loss of the resistor network. To implement
a UHF and VHF simple diplexer, refer to the Front-End
Diplex Filter for MAX3580 application note, available at
www.maxim-ic.com/appnotes.cfm/an_pk/3700.
The MAX3580 EV kit is fully assembled and tested. This
section provides a step-by-step guide to operating the
EV kit and testing the device’s function. Caution: Do
not turn on the DC power or RF signal generators
until all connections are made.
1) Verify that all jumpers are in place (i.e., JP43 to set
2) Connect a DC supply set to +3.3V (through an
3) Connect a DC supply set to +2.85V (maximum
4) Connect a DC supply set to +2.85V (maximum
5) Connect one RF signal generator to the RFIN/RFIN2
6) Connect either of the I/Q baseband outputs on the
7) Connect the EV kit board to the PC through a parallel
8) Turn on the DC supply. The supply current should
9) Run the control software on an IBM-compatible PC.
ADDR2 for the device’s address).
ammeter if desired) to the VCC and GND terminals
on the EV kit. Do not turn on the supply.
gain) to the RF_AGC terminal on the EV kit. Do not
turn on the supply.
gain) to the BB_AGC terminal on the EV kit. Do not
turn on the supply.
SMA connector. Do not turn on the generator’s out-
put.
EV kit to a spectrum analyzer through a BNC cable.
cable.
read approximately 190mA.
Using the control software, configure the following:
a)
b) On the Synthesizer section of the software, set
Select the Register section of the EV kit soft-
ware. Program the registers to the defined ope-
rational state as per Table 2 of the MAX3580
data sheet. Refer to the MAX3580 data sheet for
more information.
R Divider = 2 (this sets the comparison fre-
_______________________________________________________________________________________
Connections and Setup
MAX3580 Evaluation Kit
The RF and baseband VGA circuits of the MAX3580
are controlled independently through jumpers JP41
and JP44, respectively. Connecting pins 2-3 of JP41
closes the RF gain control loop.
A good PCB is an essential part of an RF circuit design.
The EV kit PCB serves as a guide for laying out a board
using the MAX3580. Keep traces carrying RF signals
as short as possible to minimize radiation and insertion
loss. Use impedance control on all RF signal traces.
The exposed paddle must be soldered evenly to the
board’s ground plane for proper operation. Use abun-
dant vias beneath the exposed paddle and between RF
traces to minimize undesired RF coupling.
To minimize coupling between different sections of the
IC, each VCC pin must have a bypass capacitor with a
low-impedance path to the closest ground at the fre-
quency of interest. Do not share ground vias among
multiple connections to the PCB ground plane. Refer to
the Power-Supply Layout section of the MAX3580 data
sheet for more information.
c)
d) Select for the appropriate RFIN or RFIN2 input
e)
f)
g) Activate and set the power level of the RF gene-
h)
quency to 10MHz when using the on-board
20MHz crystal).
Select for AutoTuner ON (this allows the soft-
ware to pick the appropriate divider and to
select the appropriate VCO for the entered LO
frequency).
on the Block Diagram section of the software.
Enter the desired LO frequency.
Based on the LO frequency, the EV kit software
automatically sets the appropriate tracking filter
setting.
rator to achieve 1V
puts, or 0.5 V
50Ω instrument. Note the 6dB loss at the output
ports of the EV kit due to the 50Ω resistor in
series at the buffer outputs, and the 50Ω load
of the test equipment.
Check the I/Q outputs.
P-P
(-2dBm) when loaded by a
P-P
at the IF connector out-
Layout Issues
Gain Control
3