MAX7058EVKIT+ [MAXIM]

Fully Assembled and Tested;


型号：	MAX7058EVKIT+
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Fully Assembled and Tested
文件：	总7页 (文件大小：682K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MAX7058 Evaluation Kit

Evaluates: MAX7058

General Description

Features

S Proven PCB Layout

The MAX7058 evaluation kit (EV kit) provides a proven

design to evaluate the MAX7058 dual-frequency ASK

transmitter in a 24-pin TQFN package with an exposed

pad. The EV kit enables testing of the device’s RF perfor-

mance and requires no additional support circuitry. The

RF output uses a 50I matching network and an SMA

connector for convenient connection to test equipment.

The EV kit comes with a MAX7058ATG+ installed on the

EV board.

S Proven Components List

S Adjustable Programmable Frequency (315MHz

and 390MHz)

S Fully Assembled and Tested

Ordering Information

PART

TYPE

MAX7058EVKIT+

EV Kit

+Denotes lead(Pb)-free and RoHS compliant.

Component List

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

5-pin header

0.01FF Q10%, 50V X7R ceramic

capacitors (0603)

Murata GRM188R71H103K

C1, C2, C3

C4, C5

JU1–JU12

3-pin headers

18nH Q5% inductor (0603)

Murata LQW18AN18NJ00

0.1FF Q10%, 16V X7R ceramic

capacitors (0603)

Murata GRM188R71C104K

22nH Q5% inductor (0603)

Murata LQW18AN22NJ00

0W Q5% resistor

680pF Q5%, 50V C0G ceramic

capacitor (0603)

Murata GRM1885C1H681J

Not installed, SMA female verti-

cal mount

REFIN

RFOUT

TP1, TP3–TP12

TP2

SMA female vertical mount

Black miniature test points

Not installed, miniature test point

220pF Q10%, 50V C0G ceramic

capacitors (0603)

Murata GRM1885C1H221K

C7, C8

C9, C10

C11

315MHz/390MHz dual-frequency

ASK transmitter (24 TQFN-EP*)

Maxim MAX7058ATG+

100pF Q5%, 50V C0G ceramic

capacitors (0603)

Murata GRM1885C1H101J

15MHz crystal

Crystek 017480

8.2pF Q0.25pF, 50V C0G ceram-

ic capacitor (0603)

Murata GRM1885C1H8R2C

—

Shunts

PCB: MAX7058 EVALUATION

KIT+

10pF Q5%, 50V C0G ceramic

capacitors (0603)

Murata GRM1885C1H100J

C12, C13

C14, C15

*EP = Exposed pad.

Not installed, ceramic capacitors

(0603)

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

19-4831; Rev 0; 10/09

MAX7058 Evaluation Kit

Evaluates: MAX7058

Component Suppliers

SUPPLIER

Crystek Corporation

Murata Electronics North America

PHONE

WEBSITE

www.crystek.com

800-237-3061

770-436-1300

www.murata-northamerica.com

Note: Indicate that you are using the MAX7058 when contacting these component suppliers.

7) To test at a carrier frequency of 390MHz, change the

Quick Start

Required Equipment

shunt on jumper JU12 to the 2-3 position (FSEL = 0).

8) Set the spectrum analyzer to a center frequency of

390MHz and a span of 1MHz.

•ꢀ MAX7058ꢀEVꢀkit

•ꢀ Spectrumꢀanalyzer

•ꢀ 2.7V,ꢀ25mAꢀpowerꢀsupply

9) With the shunt on jumper JU2 in the 1-2 position, the

spectrum analyzer should display a peak of approxi-

mately +10dBm at 390MHz. Set DIN to 0 by moving

the shunt on JU2 to the 2-3 position. The spectrum

analyzer peak at 390MHz is gone and only the noise

floor displays. Set DIN to 1 by changing the shunt on

JU2 to the 1-2 position. The center frequency is again

at 390MHz.

Procedure

The MAX7058 EV kit is fully assembled and tested.

Follow the steps below to verify board operation:

1) Verify that all jumpers (JU1–JU12) are in their default

positions, as shown in Table 1.

2) Connect the positive terminal of the 2.7V power sup-

ply to the VDD pad and the GND terminal to the GND

pad. Do not turn on the power supply.

Additional Evaluation

For efficiency measurements, apply power to the VDD

pad with an ammeter in series. Apply 2.7V to VDD.

3) By default, the MAX7058 is set to the carrier frequen-

cy of 315MHz (TOGGLE = 0, FSEL = 1).

Connect a power meter to RFOUT. Measure the output

power and supply current.

4) Connect the RFOUT SMA connector to the spectrum

analyzer. Set the analyzer to a center frequency of

315MHz and a span of 1MHz.

The efficiency is calculated by the following equation:

OUT

/10)

Efficiency =

eq. 1

is in deci-

5) Add a shunt on jumper JU2 to the 1-2 position. This

forces DIN to go high.

IxV

6) Turn on the power supply and observe the spectrum

analyzer. The spectrum analyzer should display a

peak of approximately +10dBm at 315MHz. Set DIN

to 0 by moving the shunt on jumper JU2 to the 2-3

position. The spectrum analyzer peak at 315MHz is

gone and only the noise floor displays. Set DIN to 1

by changing the shunt on JU2 to the 1-2 position. The

center frequency is again at 315MHz.

where I is in milliamps, V is in volts, and P

bels relative to 1mW.

OUT

For example, if P

is equal to +10dBm, supply cur-

OUT

rent is 10mA, supply voltage is 2.7V, and the efficiency

is approximately 37%.

Maxim Integrated

MAX7058 Evaluation Kit

Evaluates: MAX7058

Table 1. MAX7058 EV Kit Jumper Description (JU1–JU12)

SHUNT

POSITION

JUMPER

DESCRIPTION

1-2*

2-3

1-2

2-3

Connects DVDD to VDD.

JU1

Connects DVDD to TP1. Must apply an external voltage on TP1 to power DVDD.

Connects DIN to VDD.

Connects DIN to GND.

JU2

To apply external data to DIN, take the shunt off and apply a pattern on TP3. Data rate can be as

high as 100kbps NRZ.

Open*

1-2*

2-3

Connects ENABLE to VDD (normal operation).

Connects ENABLE to GND (standby).

JU3

JU4

Connects TOGGLE to VDD (RF output data is toggled between the two carrier frequencies (see

Table 2).

1-2

2-3*

1-2*

2-3

Connects TOGGLE to GND (single-carrier frequency).

Connects AVDD to VDD.

JU5

JU6

Connects AVDD to TP6. Must apply an external voltage on TP6 to power AVDD.

Connects PAVDD to VDD.

1-2*

2-3

Connects PAVDD to TP7. Must apply an external voltage on TP7 to power PAVDD.

Connects PAOUT to ROUT for ASK amplitude shaping in.

Connects PAOUT to PAVDD for ASK amplitude shaping out.

Connects CAP4 to VDD to add 4pF shunt capacitance to PAOUT only at 315MHz.

Connects CAP4 to GND.

1-2*

2-3

JU7

1-2

JU8

2-3*

1-2*

2-3

Connects CAP3 to VDD to add 2pF shunt capacitance to PAOUT only at 315MHz.

Connects CAP3 to GND.

JU9

1-2

Connects CAP2 to VDD to add 1pF shunt capacitance to PAOUT only at 315MHz.

Connects CAP2 to GND.

JU10

JU11

2-3*

1-2

Connects CAP1 to VDD to add 0.5pF shunt capacitance to PAOUT only at 315MHz.

Connects CAP1 to GND.

2-3*

1-2*

2-3

Connects FSEL to VDD (see Table 2).

JU12

Connects FSEL to GND (see Table 2).

*Default position.

Table 2. Toggle Pin Operation

TOGGLE PIN

FSEL PIN

OPERATING STATE

Continuous fixed-frequency operation at 390MHz.

Continuous fixed-frequency operation at 315MHz.

Five packets toggle operation between 315MHz and 390MHz.

100 packets toggle operation between 315MHz and 390MHz.

Maxim Integrated

MAX7058 Evaluation Kit

Evaluates: MAX7058

Power Supply

The MAX7058 operates from a 2.1V to 3.6V supply.

Apply an external voltage up to 3.6V between the VDD

and GND pads. VDD by default powers DVDD, AVDD,

and PAVDD.

Layout Issues

A properly designed PCB is essential for any RF/micro-

wave circuit. Keep high-frequency input and output lines

as short as possible to minimize losses and radiation. At

high frequencies, trace lengths that are on the order of

λ/10 or longer can act as antennas.

DVDD, AVDD, and PAVDD

DVDD, AVDD, and PAVDD are powered by VDD by

default. To apply an external voltage to DVDD, change

the shunt on jumper JU1 to the 2-3 position and apply

an external voltage on TP1. To apply an external volt-

age to AVDD, change the shunt on jumper JU5 to the

2-3 position and apply an external voltage on TP6. To

apply an external voltage to PAVDD, change the shunt

on jumper JU6 to the 2-3 position and apply an external

voltage on TP7.

Both parasitic inductance and capacitance are influ-

ential on circuit layouts and are best avoided by using

short trace lengths. Generally, a 10-mil wide PCB trace,

0.0625in above a ground plane, with FR4 dielectric has

about 19nH/in of inductance and about 1pF/in of capaci-

tance. In the matching network, where the inductor is

on the order of 22nH and a capacitor is on the order of

10pF, the proximity of the circuit to the MAX7058 has a

strong influence on the effective component values.

External Frequency Input

For applications where an external frequency is desired

over the crystal frequency, it is possible to apply an

external frequency through REFIN. Capacitors C14 and

C15 are necessary (use a 100pF capacitor and remove

the Y1 crystal). The MAX7058 operates by multiply-

ing the crystal frequency to the necessary RF carrier

frequency. When FSEL is low, the crystal frequency is

multiplied by 26 (390MHz) and when FSEL is high, the

multiplication is 21 (315MHz). Changing the frequency to

a different value would result in different carrier frequen-

cies and components not matching the required imped-

ance characteristics.

To reduce the parasitic inductance, use a solid ground

or power plane below the signal traces. Also, use low-

inductance connections to ground on all GND pins,

and place decoupling capacitors close to all VDD

connections.

Detailed Description of Hardware

The MAX7058 EV kit provides a proven layout for the

MAX7058. On-board test points are included to monitor

various signals and to provide power (Table 3).

Table 3. Test Points

DESCRIPTION

External DVDD supply

No connection (not populated)

DIN input

ENABLE input

TOGGLE input

External AVDD supply

External PAVDD supply

CAP4 input

CAP3 input

CAP2 input

CAP1 input

FSEL input

Maxim Integrated

MAX7058 Evaluation Kit

Evaluates: MAX7058

Figure 1. MAX7058 EV Kit Schematic

Maxim Integrated

MAX7058 Evaluation Kit

Evaluates: MAX7058

Figure 2. MAX7058 EV Kit Component Placement Guide—

Component Side

Figure 3. MAX7058 EV Kit PCB Layout—Component Side

Figure 4. MAX7058 EV Kit PCB Layout—Solder Side

Maxim Integrated

MAX7058 Evaluation Kit

Evaluates: MAX7058

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent

licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and

max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.

Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000

2009 Maxim Integrated Products, Inc.

Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.

MAX7058EVKIT+ [MAXIM]

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