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MAX3558 Evaluation Kit
Quick Start
The MAX3558 EV kit is fully assembled and factory test-
ed. Follow the instructions in the Connections and
Setup section for proper device evaluation. Figure 1
shows the schematics. Figures 2 – 7 are component
placement guides and PC board layouts.
Test Equipment Required
? An RF signal generator capable of delivering
+13dBm of output power up to 900MHz
? A spectrum analyzer covering the operating fre-
quency range of the device
5)
6)
7)
8)
9)
Connect the spectrum analyzer to the OUT1 F-
connector. Set the center frequency to 50MHz and
set the span to 5MHz.
Turn on the DC power supplies and the RF signal
generator.
Slowly increase the adjustable supply to +3V for
the gain control.
You should see the output signal on the spectrum
analyzer. Adjust the voltage on the JPA1 pin to
observe the gain-control range.
When measuring the gain, be sure to account for
balun losses (0.08dB at 50MHz), cable losses,
? A +4.75V to +5.25V power supply that can source
500mA
? A 0 to +3V adjustable DC supply that can source
1mA for AGC input
? A voltmeter or multimeter for monitoring the power-
detector output
? (Optional) An ammeter for measuring supply current
? (Optional) A network analyzer for measuring gain
and return loss
and circuit board losses (0.1dB).
10) Repeat the steps for output OUT2 to OUT4, if
desired.
11) (Optional) Another method for determining gain is
by using a network analyzer. This has the advan-
tage of displaying gain over a swept frequency
band and input power. Refer to the network ana-
lyzer manufacturer ’ s user manual for setup details.
Power-Detector Testing
Connections and Setup
This section provides a step-by-step guide to operating
the EV kit and testing the device ’ s functions. Do not
turn on any DC power or RF signal generator until
all connections are completed.
LNA Output Testing
1)
2)
3)
If connected, remove the adjustable DC power
supply connected to the JPA1.
Make sure there are shunts on JPPD, JPA1, JPRA
(either side), and JPS1 is in the ON position.
Vary the signal generator ’ s output power to
observe the LNA ’ s output power. Once the input
power reaches the attack point, the LNA ’ s output
1)
2)
3)
4)
Make sure there are shunts installed on JPS2,
JPS3, and JPS4 in the OFF position, and a shunt in
the ON position for JPS1. This setting activates
OUT1 while turning off the remaining outputs.
Connect a DC power supply, preset to +5.0V, to
V CC (through an ammeter if desired), and GND
terminals on the EV kit. If available, set the current
limit to 400mA.
Connect an adjustable DC power supply, preset to
+0V, to the JPA1 jumper and GND terminals on
the EV kit. If available, set the current limit to 1mA.
The JPA1 is the AGC1 input.
Connect the RF signal generator to the RFIN F-
connector. Do not turn on the generator ’ s output.
Set the generator for an output frequency of
50MHz. Set the level to +15dBmV.
power should be relatively constant.
Layout
The EV kit PC board can serve as a guide for layout
using the MAX3558. Keep traces carrying RF signals as
short as possible to minimize radiation and insertion
loss due to the PC board. Keep the differential output
traces together and of equal length to ensure signal
amplitude balance. Solder the entire bottom side
exposed paddle evenly to the board ground plane.
2
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