MAX2745EVKIT 查看數據表（PDF） - Maxim Integrated
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MAX2745EVKIT Datasheet PDF : 6 Pages
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MAX2745 Evaluation Kit
Jumper Description
There are eight jumpers on the MAX2745 EV kit besides
the power-supply jumpers.
1) JP9—SHDN. Connect pin 2 to pin 3 (GND) for nor-
mal operation.
2) JP7—TCXO power supply. By default the MAX2745 EV
kit uses a 16MHz crystal, so leave this jumper open.
3) JP5—External LNA supply. Refer to the MAX2745
data sheet for more details.
4) JP6—Short this jumper when testing the voltage
booster. When JP6 is shorted, JP2 MUST be open
and 1.6V to 2.3V supply is expected at JP1
(VDD18).
5) JP10—Reserved. Pin 2 MUST be shorted to pin 1
(GND) for normal operation.
6) JP8—Voltage booster enable. Short pin 2 to pin
3 (VDD) to disable the voltage booster (nor-
mal operation).
7) JP11—SHDN of the MAX8510 LDO. Connect pin
2 to pin 1 (VDD) to enable the MAX8510 (nor-
mal operation).
8) JP2—Short this jumper to connect the MAX8510 LDO
output to the power supply of the EV board. If a supply
voltage other than 2.85V is desired, leave JP2 open
and connect the new supply voltage to pin 1 of JP2.
When the voltage booster is enabled, JP2 MUST be
open and NO supply is allowed on either pin.
Control Software
The control software is needed to test the VSPORT of
the MAX2745. It is mainly for internal test purposes and
not required for normal operation. Refer to the
MAX2745 data sheet for more details.
Quick Start
The MAX2745 EV kit is fully assembled and factory test-
ed. Follow the instructions in the Connections and
Setup section for proper device evaluation.
Test Equipment Required
This section lists the recommended test equipment to
verify operation of the MAX2745. It is intended as a
guide only, and some substitutions are possible.
• An RF signal generator capable of delivering RF
power as low as -120dBm and as high as 0dBm at
the 1575.42MHz operating frequency (HP E4433B,
or equivalent)
• An RF spectrum analyzer that covers the MAX2745
operating frequency range, as well as a few harmon-
ics (FSEB20, for example)
• Two power supplies capable of up to 1A at +1.6V to
+6.0V
• One ammeter for measuring the supply current
(optional)
• 50Ω SMA cables
• A network analyzer (HP 8753D, for example) to mea-
sure small-signal return loss and gain (optional)
• An oscilloscope to check the digital IF output
Connections and Setup
This section provides a step-by-step guide to operating
the EV kit and testing the device’s function. Do not turn
on the DC power or RF signal generators until all
connections are made:
1) Connect a DC supply set to +3.3V to the VDC and
GND terminals on the EV kit. Do not turn on the supply.
2) Connect a DC supply set to +5.0V to the 5VDC on
the EV kit. Do not turn on the supply.
3) Connect one RF signal generator to the RFIN SMA
connector; do not turn on the generator’s output.
Set the output frequency to 1575.420000MHz. Set
the power level to -120dBm.
4) Connect the ACOMOUT+/- output on the EV kit to a
spectrum analyzer through an SMA cable.
5) Connect the EV kit to a PC through a parallel cable.
6) Run the control software on an IBM-compatible PC.
7) Set the digital controls to the appropriate states
(refer to the MAX2745 data sheet for the digital con-
trol settings).
8) Turn on the DC supplies. The supply current should
read approximately 20mA.
9) Activate the RF generator’s output.
10) Check the IF outputs.
11) Check other features of the MAX2745, e.g., 16MHz
clock output, voltage booster, temperature-sensor
output, etc.
Layout Issues
A good PC board is an essential part of RF circuit
design. The EV kit PC board can serve as a guide for
laying out a board using the MAX2745. Keep traces
carrying RF signals as short as possible to minimize
radiation and insertion loss. Use impedance control on
all RF signal traces. The VCC node on the PC board
should have decoupling capacitors to the closest
ground. Refer to the Layout section of the MAX2745
data sheet for more information.
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