MAX2430EVKIT-PWRQSOP 데이터 시트보기 (PDF) - Maxim Integrated

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MAX2430EVKIT-PWRQSOP

MAX2430 Evaluation Kits

Maxim Integrated 

MAX2430 Evaluation Kits

_________________________Quick Start

The MAX2430 EV kits are fully assembled and factory

tested. All measurements described below use a

900MHz test frequency. Do not turn on the power

until all connections are made.

Test Equipment Required

• Signal-Source Sine-Wave Generator with range up to

1000MHz (example: HP8656B)

• Spectrum Analyzer with range up to 4GHz (example:

TEK2755AP)

• +3V to +5.5V, 400mA adjustable output power sup-

ply

• Current meter that can display up to 400mA

Connections and Signal Conditions

1) Connect an SMA cable from the RF signal source to

the PIN input on the EV kit. Ensure that the RF power-

source input power is off or set below -50dBm.

2) Connect an SMA cable from the spectrum analyzer

to the POUT connector on the EV kit. Note that if the

front end of the spectrum analyzer can not handle

more than 20dBm of input power, you must place an

appropriate attenuator between the POUT connector

and the spectrum analyzer to prevent damage.

3) Connect the 3V power supply through a current

meter to the appropriate VCC and GND terminals on

the EV kit, and apply power.

4) Position the J1 shunt across pins 1 and 2 to enable

the MAX2430 (SHDN = high). Note that the normal

bias current drawn by the MAX2430 EV kit should be

approximately 30mA to 60mA over the 3V to 5.5V

supply range when no RF input power is applied.

5) Set the input power to -20dBm and the frequency to

900MHz on the signal source.

6) Set the spectrum analyzer’s dynamic range and fre-

quency range for an appropriate setting to view the

900MHz output.

7) Tune the output stage matching network for maximum

output power at 900MHz. See the Adjustments and

Control section for the CO and CSH trim-capacitor tun-

ing procedure

_______________Detailed Description

Analysis

1) Set the RF source power to -13dBm. At 900MHz, the

spectrum analyzer should display a power level near

20dBm (of course, if you have used an attenuator,

adjust your reading accordingly). If necessary, adjust

the input power up or down in 0.1dB steps to get the

equivalent output power equal to 20dBm at the POUT

port. The power gain (GP = POUT - PIN) should be

greater than 30dB.

If you cannot achieve 20dBm output power, verify

that the supply voltage between the VCC and GND

pads on the EV kit is 3.00V. This ensures that the

supply connection wire and current-meter shunt

losses are not causing excessive supply voltage

drops. Also, make sure the output stage matching

network has been properly tuned for the center fre-

quency of interest, according to the CO and CSH

trim-capacitor tuning procedure found in the

Adjustments and Control section.

2) Disable the MAX2430 by moving the J1 shunt to

pins 2 and 3. With the part disabled and RF power

still applied to the RF input, you can measure the off-

state feedthrough of the MAX2430. Adjust your

spectrum analyzer to display the amount of 900MHz

leakage power that exists at the POUT port. The iso-

lation should be approximately 50dB, so with an

input power of -12dBm, the output power should

measure approximately -62dBm.

3) Enable the MAX2430 again by moving the J1 shunt

to pins 1 and 2. Note that the output power is again

around 20dBm.

4) Set the spectrum analyzer to display the 1800MHz

2nd harmonic frequency. The measured power

should be typically 26dB down from the fundamental

power at 900MHz. The 3rd harmonic power at

2700MHz should be typically 40dB down. The three-

element output stage matching circuitry provides

some rejection of the harmonic products.

5) Set the spectrum analyzer to measure the 900MHz

fundamental power. Adjust VCC from 3V up to 5.5V.

Note that the output power has risen approximately

2dBm (up to 22dBm) and that the power gain has

increased by 2dB.

Adjustments and Control

CO and CSH

The quickest method for tuning the output is to apply

-20dBm of input power at the desired frequency, then

adjust CO and CSH until the output power is maximized

as read from a spectrum analyzer or power-meter dis-

play. Only one value of CO and CSH is correct for a

given frequency. For best results, use a nonconductive

adjustment tool.

CO and CSH are surface-mount, 0pF to 6pF trim

capacitors used to tune the output transistor matching

2 _______________________________________________________________________________________

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