MAX3674EVKIT [MAXIM]

On-Board 16MHz Crystal Reference;


型号：	MAX3674EVKIT
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	On-Board 16MHz Crystal Reference
文件：	总10页 (文件大小：621K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-4156; Rev 0; 5/08

MAX3674 Evaluation Kit

Evluates:MAX3674

General Description

Features

♦ Fully Assembled and Tested

The MAX3674 evaluation kit (EV kit) is a fully assembled

and tested demonstration board that simplifies evalua-

tion of the MAX3674 high-performance dual-output net-

work clock synthesizer. The EV kit includes a 16MHz

crystal and other hardware components necessary to

evaluate all the MAX3674 functions. Software is provid-

ed that communicates with the EV kit through a USB

port. The software provides an easy way to set opera-

tional modes and read/write internal registers. The EV

kit is powered by a +3.3V supply and USB port. SMA

connectors are used for the reference clock input and

LVPECL clock outputs to simplify connection to test

equipment. Two LEDs indicate the status of LOCK and

USB power.

♦ On-Board 16MHz Crystal Reference

♦ Software Control Through USB Port

♦ SMA Connectors for Clock I/Os

♦ Powered by +3.3V Supply and USB Port

♦ Indicators for LOCK and USB Power

Ordering Information

PART

TYPE

MAX3674EVKIT+

EV Kit

+Denotes lead-free/RoHS-compliant.

Component List

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

2 x 3 pin header (0.1in centers)

Sullins PEC36SAAN

33pF ±10% ceramic capacitors

(0402)

C1, C2

C3, C4

Not installed

Test points

Keystone 5000

J6, J7

C5, C18, C20,

C21, C22, C24,

C26, C28, C29,

C31, C33

0.1μF ±10% ceramic capacitors

(0603)

SMA connectors, edge-mount,

tab center

Johnson 142-0701-851

J10–J13

22μF ±10% ceramic capacitors

(1206)

SMA connector, PCB mount

Johnson 142-0701-231

C6, C34

J17

C7, C14, C41,

C42

0.22μF ±10% ceramic capacitors

(0402)

22μH ±20% inductor, 520mA

Taiyo-Yuden CBC3225T220M

C8, C9, C11,

C12, C13, C40,

C47, C48

4.7μH ±20% inductor, 870mA

Taiyo-Yuden CBC3225T4R7M

0.1μF ±10% ceramic capacitors

(0402)

Ferrite beads

Murata BLM18HK102SN1 (0603)

L4–L7

0.01μF ±10% ceramic capacitor

(0402)

C10

R1, R21

49.9ꢀ ±1% resistors (0603)

10ꢀ ±1% resistor (0603)

470ꢀ ±1% resistor (0603)

4.75kꢀ ±1% resistors (0603)

1.5kꢀ ±1% resistor (0603)

C15, C16, C19,

C32

4.7μF ±10% ceramic capacitors

(0805)

C17, C23, C25,

C27, C30

1μF ±10% ceramic capacitors

(0603)

R4, R6–R11

0.01μF ±10% ceramic capacitor

(0603)

R12, R13, R22,

R23

C35

D1, D2

10kꢀ ±1% resistors (0603)

LEDs, green

Panasonic LN38GPX

R24

680ꢀ ±1% resistor (0603)

143ꢀ ±1% resistors (0603)

4.99kꢀ ±1% resistors (0603)

R25–R28

R34, R35

Mini USB connector, B type

Tyco 1734035-1

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

MAX3674 Evaluation Kit

Component List (continued)

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

Test points

Buffer (5 SC-70)

Fairchild NC7SV125P5X

TP1–TP7, TP10

Keystone 5000

16.000MHz SMD crystal, 18pF

Citizen HCM49-16.000MABJ-UT

High-performance dual-output

network clock synthesizer

(48 LQFP)

6.000MHz SMD crystal, 32pF

ECS ECS-60-32-5PXDN-TR

Maxim MAX3674ECM+

Microcontroller (28 SO)

Microchip PIC16C745-I/SO

Shunts for J5

Sullins SSC02SYAN

None

Dual level translator (8 SOT23)

Maxim MAX3373EEKA+

PCB: MAX3674 EV Kit+ Circuit

Board, Rev A

I/O port expander (24 TQFN)

Maxim MAX7312ATG+

Evluates:MAX3674

5) After installation is complete, follow this path to start

the program: Start → All Programs → Maxim

Integrated Products → MAX3674 Evaluation Kit

Quick Start

Note: In the following sections, software-related items

are identified by bolding. Text in bold refers to items

directly from the EV kit software. Text in bold and

6) Press the Initialize / Test Communication button.

The message box should report:

underlined refers to items from the Windows operating

system.

USB Device Detected

MAX3674 Detected

MAX7312 Detected

1) Install two shunts on jumper J5, both to the (L) posi-

tion. This sets address pins ADR0 and ADR1 low.

2) Connect a +3.3V supply to VCC (J6) and GND (J7).

Set the supply current limit to 200mA.

7) Press the following buttons in this order: RESET →

LOAD → READ. At this point, the LOCK output

should be high (LED D1 on), indicating that the PLL

is locked.

3) Connect the computer to the EV kit with a USB

cable (A-Male to Mini-B-Male). LED D2 should

switch on, indicating that USB power is detected.

8) Set the values for P, NA, NB, and M to obtain the

4) To download the latest version of the EV kit software

(MAX3674revX.zip), visit the Maxim website at

www.maxim-ic.com/evkitsoftware. Uncompress

the zip file to a local folder and run the installation

file (setup.exe). Installation requires administrative

rights and may also require Internet access to

download necessary drivers.

desired output frequency.

9) Press the LOAD button, followed by the READ button.

10) Connect the clock outputs (QA, QA, QB, QB) to test

equipment with SMA cables. Terminate unused out-

puts.

Windows is a registered trademark of Microsoft Corp.

_______________________________________________________________________________________

MAX3674 Evaluation Kit

Evluates:MAX3674

LVPECL Clock Outputs

The LVPECL clock outputs (QA, QA, QB, QB) have on-

board bias-Ts that provide DC biasing and AC-couple

the signal to allow direct connection to 50Ω-terminated

test equipment. Unused outputs should be terminated

to prevent reflections on the transmission lines.

Detailed Description

The MAX3674 EV kit simplifies evaluation by providing

the hardware and software needed to evaluate all the

MAX3674 functions. A microcontroller (Microchip

PIC16C745) and I/O port expander (MAX7312) allow

the user to set control pins and read/write registers with

software. The on-board 16MHz crystal and integrated

oscillator generate the PLL reference clock.

Alternatively, an external clock source can be connect-

ed to the REF_CLK input to serve as the reference

clock. LED D1 switches on when the LOCK output is

high, indicating the PLL is locked.

Reference Clock Input

The REF_CLK input (J17) accepts sinusoidal or square-

wave clocks with frequencies between 15MHz and

20MHz, and swings up to 3.3V . This input has a 50Ω

P-P

DC termination to ground and is AC-coupled to an on-

board buffer. The buffer is used to square the clock

signal applied to the REF_CLK input pin.

The microcontroller is powered by the USB port +5V

supply. LED D2 switches on when USB power is

detected. The MAX3674 and I/O port expander are

I C Slave Address

Jumper J5 is used to set the two selectable address

bits (ADR0 and ADR1). The EV kit software performs a

search at power-up to determine which of the four pos-

sible slave addresses is being used.

the MAX3373 level translator that interfaces the I C

clock and data lines from the microcontroller to the

MAX3674 and I/O port expander, and is powered by

both supplies. The USB cable and +3.3V supply can

be connected to the EV kit in any sequence.

EV Kit Software

The EV kit software provides an easy way to set opera-

tional modes and read/write internal registers

(Figure 1). Refer to the MAX3674 data sheet for

detailed descriptions of the MAX3674 functions and

guidance on selecting dividers settings. Note that when

the Programming Interface is set to I2C, the settings

for dividers P, NA, NB, and M are configured within the

MAX3674 after pressing the LOAD button.

Master Reset

It is recommended to press the RESET button after

every power-up.

_______________________________________________________________________________________

MAX3674 Evaluation Kit

Evluates:MAX3674

Figure 1. MAX3674 EV Kit Software

_______________________________________________________________________________________

MAX3674 Evaluation Kit

Evluates:MAX3674

G N D

N A 2

N A 1

N A 0

M 9

M 8

M 7

M 6

M 5

G N D

M 4

M 3

M 2

M 1

M 0

3 7

3 8

3 9

4 0

4 1

4 2

4 3

4 4

4 5

4 6

4 7

4 8

2 4

2 3

2 2

2 1

2 0

1 9

1 8

1 7

1 6

1 5

1 4

1 3

P L O A D

C C

M R

S D A

S C L

A D R 1

A D R 0

C C

S C L

S D A

I / O 1 0

1 2

1 9

2 0

2 1

2 2

2 3

2 4

I / O 9

1 1

1 0

V +

I / O 8

I N T

G N D

A D 1

A D 2

I / O 7

I / O 6

Figure 2. MAX3674 EV Kit Schematic

_______________________________________________________________________________________

MAX3674 Evaluation Kit

Evluates:MAX3674

Figure 3. MAX3674 EV Kit Component Placement Guide—Component Side

_______________________________________________________________________________________

MAX3674 Evaluation Kit

Evluates:MAX3674

Figure 4. MAX3674 EV Kit PCB Layout—Component Side

_______________________________________________________________________________________

MAX3674 Evaluation Kit

Evluates:MAX3674

Figure 5. MAX3674 EV Kit PCB Layout—Ground Plane

_______________________________________________________________________________________

MAX3674 Evaluation Kit

Evluates:MAX3674

Figure 6. MAX3674 EV Kit PCB Layout—Power Plane

_______________________________________________________________________________________

MAX3674 Evaluation Kit

Evluates:MAX3674

Figure 7. MAX3674 EV Kit PCB Layout—Solder Side

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

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

10 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

is a registered trademark of Maxim Integrated Products, Inc.

MAX3674EVKIT [MAXIM]

相关型号：

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