MAX9995EVKIT【PDF 2/8 页】EVAL KIT FOR MAX9995

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MAX9995 Evaluation Kit

Component List (continued)

DESIGNATION

QTY

DESCRIPTION

DESIGNATION

QTY

DESCRIPTION

10nH ± 5% wire-wound inductors

Large test point for 0.062in PC board

L3, L6

2

(0603)

TP3

1

(white)

Coilcraft 0603CS-10NXJBC

Mouser 151-101 or equivalent

R1, R4

R2, R5

2

2

1.21k ? ±1% resistors (0402)

392 ? ± 1% resistors (0402)

Active dual mixer IC (6mm x 6mm

thin QFN, exposed paddle) Maxim:

R3, R6

R7

T1, T2

TP1

2

1

2

1

10 ? ± 1% resistors (1206)

47k ? ± 5% resistor (0603)

4:1 transformers ( 200:50 )

Mini Circuits TC4-1W-7A

Large test point for 0.062in PC board

(red)

Mouser 151-107 or equivalent

U1

1

MAX9995ETX

NOTE: U1 HAS AN EXPOSED

PADDLE CONDUCTOR THAT

REQUIRES IT TO BE SOLDER

ATTACHED TO A GROUNDED PAD

ON THE CIRCUIT BOARD TO

ENSURE PROPER

ELECTRICAL/THERMAL DESIGN.

Large test point for 0.062in PC board

TP2

1

(black)

Mouser 151-103 or equivalent

Quick Start

The MAX9995 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

Table 1 lists the equipment required to verify the opera-

tion of the MAX9995 EV kit. It is intended as a guide

only, and some substitutions are possible.

Connections and Setup

This section provides a step-by-step guide to testing

the basic functionality of the EV kit. As a general pre-

caution to prevent damaging the outputs by driving

high-VSWR loads, do not turn on DC power or RF

signal generators until all connections are made:

1) Calibrate the power meter for 1900MHz. For safety

margin, use a power sensor rated to at least

+20dBm, or use padding to protect the power head

as necessary.

2) Connect 3dB pads to the DUT ends of each of the

three RF signal generators ’ SMA cables. This

padding improves VSWR, and reduces the errors

due to mismatch.

3) Use the power meter to set the RF signal generators

according to the following:

? RF signal source: -5dBm into DUT at 1900MHz

? LO1 signal source: 0dBm into DUT at 1700MHz

(f IF = 200MHz)

? LO2 signal source: 0dBm into DUT at 1701MHz

(f IF = 199MHz)

4) Disable all three signal sources. Connect the LO1

and LO2 signal sources to the EV kit LO inputs.

5) Connect the signal sources to the appropriate SMA

inputs. The RF input can be connected to either the

RFMAIN or RFDIV inputs, depending on test.

6) Measure loss in 3dB pad and cable that is connect-

ed to IFMAIN/IFDIV. Losses are frequency depen-

dent, so test this at 200MHz (the IF frequency). Use

this loss as an offset in all output power/gain

calculations.

7) Connect this 3dB pad to the EV kit’s appropriate

IFMAIN/IFDIV connector, and connect a cable from

the pad to the spectrum analyzer.

8) Set the DC supply to +5.0V and set a current limit

around 500mA, if possible. Connect supplies to the

EV kit through the ammeter. Turn on the supply.

Readjust the supply to get +5.0V at the EV kit.

There will be a voltage drop across the ammeter

when the mixer is drawing current.

9) Select LO2 by grounding LOSEL.

10) Enable the LO and the RF sources.

Testing the Mixer

Adjust the center and span of the spectrum analyzer to

observe the IF output tone at 199MHz. The level should

be about -2dBm (6dB conversion gain, 3dB pad loss).

The spectrum analyzer’s absolute magnitude accuracy

is typically no better than ±1dB. Use the power meter to

2

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