MAXIM MAX2039 User Manual

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General Description

The MAX2039 evaluation kit (EV kit) simplifies the evalu­ation of the MAX2039 UMTS, DCS, and PCS base-sta­tion up/downconversion mixer. It is fully assembled and
tested at the factory. Standard 50Ω SMA connectors
are included on the EV kit’s input and output ports to
allow quick and easy evaluation on the test bench.

This document provides a list of test equipment
required to evaluate the device, a straight-forward test
procedure to verify functionality, a description of the EV
kit circuit, the circuit schematic, a bill of materials
(BOM) for the kit, and artwork for each layer of the PC
board.

Features

♦ Fully Assembled and Tested
♦ 50Ω SMA Connectors on Input and Output Ports
♦ 1700MHz to 2200MHz RF Frequency Range
♦ 1500MHz to 2000MHz LO Frequency Range
♦ 1900MHz to 2400MHz LO Frequency Range

(Contact Factory)

♦ DC to 350MHz IF Frequency Range
♦ 7.1dB Conversion Loss
♦ +34.5dBm Input IP3 (Downconversion)
♦ +24.4dBm Input 1dB Compression Point
♦ 7.3dB Noise Figure
♦ Integrated LO Buffer
♦ Integrated RF and LO Baluns
♦ Low -3dBm to +3dBm LO Drive
♦ Built-In SPDT LO Switch with 45dB LO1 to LO2

Isolation and 50ns Switching Time

♦ External Current-Setting Resistor Provides Option

for Operating Mixer in Reduced-Power/Reduced­Performance Mode

Evaluates: MAX2039

MAX2039 Evaluation Kit

________________________________________________________________ Maxim Integrated Products 1

19-3522; Rev 0; 11/04

Component List

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

*EP = Exposed paddle.

Component Suppliers

Note: Indicate that you are using the MAX2039 when contact­ing these component suppliers.

SUPPLIER PHONE WEBSITE

Johnson 507-833-8822 www.johnsoncomponents.com

M/A-Com 1-800-366-2266 www.macom.com

Murata 770-436-1300 www.murata.com

PART TEMP RANGE PIN-PACKAGE

MAX2039EVKIT -40°C to +85°C 20 Thin QFN-EP*

DESIGNATION QTY DESCRIPTION

4.0pF ±0.25pF, 50V C0G ceramic

C1 1

C2, C6, C7, C8,

C10, C12

C3, C5, C9,

C11

C4 1

J1, J2, J3, J4 4

capacitor (0603)
Murata GRM1885C1H4R0C
22pF ±5%, 50V C0G ceramic

6

capacitors (0603)
Murata GRM1885C1H220J

0.01µF ±10%, 50V X7R ceramic

4

capacitors (0603)
Murata GRM188R71H103K
10pF ±5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H100J
PC board edge-mount SMA RF
connectors
(flat-tab launch)
Johnson 142-0741-856

DESIGNATION QTY DESCRIPTION

R1 1

R2 1 47kΩ ±5% resistor (0603)

T1 1

TP1 1

TP2 1

TP3 1

549Ω ±1% resistor (0603)
Any

1:1 transformer (50:50)
M/A-Com MABAES0029
Large test point for 0.062in PC board
(red)
Mouser 151-107 or equivalent
Large test point for 0.062in PC board
(black)
Mouser 151-103 or equivalent
Large test point for 0.062in PC board
(white)
Mouser 151-101 or equivalent

Evaluates: MAX2039

MAX2039 Evaluation Kit

2 _______________________________________________________________________________________

Quick Start

The MAX2039 EV kit is fully assembled and factory test­ed. 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 the operation of the MAX2039. It is intended as a
guide only, and substitutions may be possible:

• DC supply capable of delivering +5.0V and 175mA

• Two RF signal generators capable of delivering

10dBm of output power in the 1GHz to 3GHz frequency
range (i.e., HP 8648)

• RF spectrum analyzer with a minimum 100kHz to
3GHz frequency range (HP 8561E)

• RF power meter (HP 437B)

• Power sensor (HP 8482A)

Connections and Setup

This section provides a step-by-step guide to testing
the basic functionality of the EV kit. As a general pre­caution 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.

This procedure is specific to operation in the U.S. PCS
band (reverse channel: 1850MHz to 1910MHz), low­side injected LO for a 200MHz IF. Choose the test fre­quency based on the particular system’s frequency
plan, and adjust the following procedure accordingly.
See Figure 1 for the mixer test setup diagram:

1) Calibrate the power meter for 1700MHz. 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 DUT ends of each of the two

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

(this will be about -2dBm before the 3dB pad).

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

(this will be about 3dBm before the 3dB pad).

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

(this will be about 3dBm before the 3dB pad).

4) Disable the signal generator outputs.

5) Connect the RF source (with pad) to the RF port.

6) Connect the LO1 and LO2 signal sources to the EV
kit’s LO1 and LO2 inputs, respectively.

7) Measure loss in 3dB pad and cable that will be con­nected to the IF port. Losses are frequency depen­dent, so test this at 200MHz (the IF frequency). Use
this loss as an offset in all output power/gain calcu­lations.

8) Connect this 3dB pad to the EV kit’s IF port connec­tor and connect a cable from the pad to the spec­trum analyzer.

9) Set the DC supply to +5.0V, and set a current limit
of around 175mA if possible. Disable the output
voltage and connect the supply to the EV kit
(through an ammeter, if desired). Enable 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.

10) Select LO1 by connecting LOSEL (TP3) to GND.

11) 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 200MHz. The level should
be about -15dBm (7dB conversion loss, 3dB pad loss).
The spectrum analyzer’s absolute magnitude accuracy
is typically no better than ±1dB. Use the power meter to
get an accurate output power measurement.

Disconnect the GND connection to LOSEL. It will be
pulled high by a pullup resistor on the board, selecting
LO2. Observe that the 199MHz signal increases while
the 200MHz decreases.

Reconfigure the test setup using a combiner or hybrid
to sum the two LO inputs to do a two-tone IP3 measure­ment if desired. Terminate the unused LO input in 50Ω.

Component List (continued)

DESIGNATION QTY DESCRIPTION

Mixer IC (5mm x 5mm 20-pin QFN
EP)
Maxim MAX2039ETP

NOTE: U1 HAS AN EXPOSED

U1 1

PADDLE CONDUCTOR THAT
REQUIRES IT TO BE SOLDER
ATTACHED TO A GROUNDED PAD
ON THE CIRCUIT BOARD TO
ENSURE A PROPER
ELECTRICAL/THERMAL DESIGN.

Detailed Description

The MAX2039 is a high-linearity up/downconverter inte­grated with RF and LO baluns, an LO buffer, and an
SPDT LO input select switch. The EV kit circuit uses the
MAX2039 and consists mostly of supply-decoupling
capacitors, DC-blocking capacitors, a current-setting
resistor, and an IF balun. The MAX2039 EV kit circuit
allows for thorough analysis and a simple design-in.

Supply-Decoupling Capacitors

Capacitors C2, C6, C7, and C8 are 22pF supply-decou­pling capacitors used to filter high-frequency noise.
Capacitors C3, C9, and C11 are larger 0.01µF used for
filtering lower frequency noise on the supply.

DC-Blocking Capacitors

The MAX2039 has internal baluns at the RF and LO
inputs. These inputs have almost 0Ω resistance at DC,
and so DC-blocking capacitors C1, C10, and C12 are
used to prevent any external bias from being shunted
directly to ground.

LO Bias

Bias current for the integrated LO buffer is set with
resistor R1 (549Ω, ±1%). The DC current of the device
can be reduced by increasing the value of R1 but the
device would operate at reduced performance levels
(see the Modifying the EV Kit section).

Tap Network

Capacitor C5 helps to terminate the second-order inter­modulation products.

IF±

The MAX2039 mixer has an IF frequency range of DC
to 350MHz. Note that these differential ports are ideal
for providing enhanced IIP2 performance. Single­ended IF applications require a 1:1 balun to transform
the 50Ω differential output impedance to a 50Ω single­ended output. After the balun, the IF return loss is bet­ter than 15dB. The differential IF is used as an input
port for upconverter operation. The user can use a dif­ferential IF amplifier following the mixer, but a DC block
is required on both IF pins. In this configuration, the IF+
and IF- pins need to be returned to ground through a
high resistance (about 1kΩ). This ground return can
also be accomplished by grounding the RF tap (pin 3)
and AC coupling the IF+ and IF- ports (pins 19 and 18).

LOSEL

The EV kit includes a 47kΩ pullup resistor (R2) for easy
selection of the LO port. Providing a ground at TP3
selects LO1, and leaving TP3 open selects LO2. To
drive TP3 from an external source, follow the limits
called out in the MAX2039 device data sheet. Logic
voltages should not be applied to LOSEL without the
+5V supply voltage. Doing so can cause the on-chip
ESD diodes to conduct and could damage the device.

Layout Considerations

The MAX2039 evaluation board can be a guide for your
board layout. Pay close attention to thermal design
and close placement of components to the IC. The
MAX2039 package exposed paddle (EP) conducts
heat from the device and provides a low-impedance
electrical connection to the ground plane. The EP must
be attached to the PC board ground plane with a low
thermal and electrical impedance contact. Ideally, this
is achieved by soldering the backside of the package
directly to a top metal ground plane on the PC board.
Alternatively, the EP can be connected to an internal or
bottom-side ground plane using an array of plated vias
directly below the EP. The MAX2039EV kit uses nine
evenly spaced 0.016in-diameter, plated through holes
to connect the EP to the lower ground planes.

Depending on the ground-plane spacing, large sur­face-mount pads in the IF path may need to have the
ground plane relieved under them to reduce parasitic
shunt capacitance.

Modifying the EV Kit

The RF, LO, and IF ports are broadband matched, so
there is no need to modify the circuit for use anywhere
in the 1700MHz to 2200MHz RF range, 1400MHz to
2000MHz LO range, and 50MHz to 350MHz IF range.

The DC current of the device can be reduced if reduced
performance is acceptable. Reducing the current is
accomplished by increasing the value of R1. Doubling
the value of R1 cuts the DC current approximately in
half. Approximately 10% of the overall IC current is
used for housekeeping (R1 set at 549Ω) and cannot be
reduced.

Evaluates: MAX2039

MAX2039 Evaluation Kit

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