MAX2116EVKIT 데이터 시트보기 (PDF) - Maxim Integrated

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MAX2116EVKIT

MAX2116/MAX2118 Evaluation Kits

Maxim Integrated 

MAX2116/MAX2118 Evaluation Kits

Measurement Corrections

Corrections on both the input and the output are neces-

sary for accurate measurements. On the MAX2116/

MAX2118 EV kit boards, F-connectors (75Ω imped-

ance) are mounted at the RFIN port. To use 50Ω test

equipment, an adapter is needed. Thus, the input

power must be adjusted to compensate for the adapter

loss (typically 5.7dB for a “min-loss” pad).

At the baseband output ports, there are 1kΩ resistors in

series with the output pins, which lead to 26.4dB loss if

50Ω test equipment is used. Therefore, for the

MAX2116 EV kit, full-scale output (800mVP-P) corre-

sponds to -24.4dBm. For the MAX2118 EV kit, when DL

= 1, full-scale output (1VP-P, differential) corresponds to

-28.4dBm on each output port, while for DL = 0, full-

scale output (590mVP-P, differential) corresponds to

-33dBm on each output port. When connecting to 50Ω

test equipment, always ensure that DC blocking is used

so that I/Q output bias networks are not disrupted.

Note on MAX2118:

All power levels specified in this EV kit description refer

to single-ended measurements.

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 con-

nections are made:

1) Verify that all jumpers are in place.

2) Connect the PC to the EV kit using the parallel

cable.

3) Connect a DC power supply set to +5V (through an

ammeter, if desired) to the VCC and GND terminals

on the EV kit. Set the current limit to 300mA. Do not

turn on the supply.

4) Connect the second DC power supply set to 0.75V

(max RF gain) to GC1 (TP7). Set the current limit to

10mA. Do not turn on the supply.

5) Connect an RF signal generator to the RFIN con-

nector. Use a 75Ω to 50Ω adapter if necessary. Do

not turn on the generator’s output.

6) Connect the I or Q output to a spectrum analyzer or

a digital oscilloscope. If using a spectrum analyzer

or an oscilloscope in 50Ω mode, insert a DC block

to protect the analyzer from damage.

7) Turn on the DC supplies. The 5V supply should

read approximately 190mA. The 0.75V supply

should be less than 1mA.

8) Open the MAX2116/MAX2118 software. The soft-

ware opens in either the MAX2116 or MAX2118

mode. You can change to the appropriate part

under the Option Menu: “Select EVkit type:

MAX2116 or MAX2118”.

9) Click on the Synthesizer tab and configure the

following:

a) Ref = 4

b) R Divider = 4 (This sets the comparison fre-

quency to 1MHz when using the on-board

4MHz crystal)

c) Calibrate VCOs by clicking the “VCO Cal” button.

d) Check “Auto Div Select” and “Auto Band

Select” (This allows the software to pick the

appropriate divider (div by 2 or div by 4) and to

select the appropriate VCO for the entered LO

frequency.)

e) Enter the desired LO frequency

10) Select the Base tab and set the following:

a) Gain Control 2 = 0 (max baseband gain)

b) M Divide = 2 and FDAC = 127 (max baseband

filter bandwidth)

c) If using the MAX2118, select the desired base-

band peak-to-peak output under the “Drive

Level” box (1VP-P or 590mVP-P).

11) Set the RF generator’s output power to approxi-

mately -65dBm. Activate the RF generator’s output

and select the desired CW input frequency so that

the generator’s frequency is 5MHz higher than the

frequency set in Step 9d. This creates a single

5MHz tone at the baseband output ports.

12) Set the spectrum analyzer: CF = 5MHz, Span =

200kHz, RBW = 1kHz, and VBW = 1kHz. Or, using

an oscilloscope, observe a tone at 5MHz. Adjust the

RF power to obtain the proper output levels as

specified in the “Measurement Corrections” section

of this procedure.

Analog Gain Control (GC1) Test:

1) Adjust the power supply connected to TP7 (GC1) to

0.75V (max RF gain).

2) Ensure that the baseband gain setting is set for

decimal 0 (max baseband gain).

3) Set the RF signal generator’s frequency to 5MHz

higher than the desired LO frequency and its input

power to -65dBm. (The signal generator power

might need to be adjusted to produce a full-scale

baseband output level.)

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