MAX3874AEGJ [MAXIM]

Clock Recovery Circuit, 1-Func, Bipolar, 5 X 5 MM, 0.90 MM HEIGHT, MO-220, QFN-32;


型号：	MAX3874AEGJ
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Clock Recovery Circuit, 1-Func, Bipolar, 5 X 5 MM, 0.90 MM HEIGHT, MO-220, QFN-32
文件：	总8页 (文件大小：207K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-2767; Rev 0, 2/03

MAX3872/MAX3874 Evaluation Kits

________________General Description

______________ Ordering Information

The MAX3872/MAX3874 evaluation kits (EV kits) simplify

evaluation of the MAX3872 and MAX3874 clock and data

recovery with limiting amplifier ICs. These EV kits enable

testing of all MAX3872 and MAX3874 functions. SMA

connectors are provided for the differential inputs and

outputs. All high-speed inputs and outputs have on-board

AC-coupling capacitors to allow direct connection to 50Ω

test equipment.

PART

TEMP. RANGE

IC PACKAGE

32 QFN

MAX3872EVKIT -40°C to +85°C

MAX3874EVKIT -40°C to +85°C

______________Component Suppliers

SUPPLIER

AVX

Coilcraft

Digi-Key

EF Johnson

Murata

PHONE

FAX

____________________________Features

843-448-9411

847-639-6400

800-344-4539

402-474-4800

770-436-1300

843-626-3123

847-639-1469

218-681-3380

402-474-4858

770-436-3030

♦

SMA Connectors for All High-Speed I/Os

Operational Mode Select Pins

Loss-of-Lock LED

Note: Please indicate that you are using the

Single +3.3V Power-Supply Operation

Fully Assembled and Tested

MAX3872/MAX3874 when ordering from these suppliers.

______________________________________________________________Component List

DESIGNATION QTY

C1–C7, C17–

C19, C22, C24, 14

C26, C28

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

SMA connectors

0.1µF 10% ceramic capacitors

(0402)

J1–J8, J25, J26 10 (edge-mount, round-pin)

EF JOHNSON 142-0701-851

J9, J12–J15,

Murata GRM36X7R104K016A

0.001µF 10% ceramic

3-pin headers (0.1in centers)

2-pin headers (0.1in centers)

Not installed

capacitors (0402)

J17–J19

J10

C8–C13

Murata GRM36X7R102K016A

33µF 10% tantalum capacitor

AVX TAJB336K016

J11, J16, J22,

C14

C15

J23

Test points

Digi-Key 5000K-ND

Not installed

2.2µF 10% tantalum capacitor

AVX TAJB225K016

J20, J21

J24

0.82µF ceramic capacitor

J9, J10, J12–

(0603) (MAX3872EVKIT)

Shunts

C16

J15, J17–J19

0.068µF ceramic capacitor

MAX3872EGJ, 32-pin QFN

(MAX3872EVKIT)

(0402) (MAX3874EVKIT)

R2–R5

Red LED

MAX3874EGJ, 32-pin QFN

Not installed

(MAX3874EVKIT)

Not installed

MAX3872/MAX3874 EV kit

circuit board, Rev C

None

910Ω 5% resistor (0402)

Not installed

50kΩ variable resistor

BOURNS 3296W-203

Not installed

56nH inductors (0805)

Coilcraft CS-560XKBC

MAX3872 datasheet

(MAX3872EVKIT)

MAX3874 datasheet

(MAX3874EVKIT)

L1–L3

_________________________________________________________________Maxim Integrated Products

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.

MAX3872/MAX3874 Evaluation Kits

Jitter analysis and product performance can also be

_______________ Detailed Description

The MAX3872/MAX3874 EV Kit is a fully assembled

and factory tested demonstration board that enables

testing of all MAX3872 and MAX3874 functions.

observed by appropriately interfacing the EV kit with a

bit-error-rate tester (BERT) and a jitter analyzer.

Operational Modes

The MAX3872/MAX3874 has three modes of

operation: normal, system loopback, and clock

holdover. The three operational modes are

programmed by connecting the appropriate pins of

JU13 (SIS) and JU14 (LREF). See Table 1. Normal

operation mode requires a serial data stream at the

SDI inputs, system loopback mode requires a serial

data stream at the SLBI inputs, and clock holdover

mode requires a reference clock signal at the SLBI

inputs.

Test Equipment Required

•

+3.3V power supply with 200mA current capability

Signal-source, 2.7Gbps minimum capability

Jitter analyzer capable of 2.7Gbps performance

Oscilloscope with at least 3GHz performance

Test Equipment Interface

The serial inputs (SDI±, SLBI±) and serial outputs

(SDO±, SCLKO±) have on-board AC-coupling

capacitors to allow direct connection to 50Ω test

equipment. The EV kit also has pads on the serial data

and clock outputs (SDO±, SCLKO±) to allow on-board

Normal and System Loopback Settings

Three jumpers (RS1, RS2, RATESET) are available for

setting the SDI or SLBI inputs to receive the

appropriate data rate (Table 2). The FREFSET pin can

be set high or low while in normal or system loopback

mode.

termination

for

coupling

high-impedance

oscilloscopes.

Quick Start (MAX3872 & MAX3874)

This procedure will set up the evaluation board for

2.48832Gbps normal operation mode, with input

threshold adjust disabled.

Clock Frequencies in Holdover Mode

Set the incoming reference clock frequency and

outgoing serial clock frequency by setting RS1, RS2,

RATESET, and FREFSET appropriately. See Table 3.

1) Place a shunt across pins 2 (SIS) and 3 (GND) of

Auto Switch to Clock Holdover Mode

To switch from normal mode to clock holdover mode

automatically when there are no data transitions

applied to the SDI inputs connect LOL directly to

LREF by placing a shunt across pins 1 and 2 of J15.

J13.

2) Place a shunt across pins 1 (VCC) and 2 (LREF)

of J14.

3) Place a shunt across pins 2 and 3 of J15.

4) Place a shunt across pins 2 (RS1) and 3 (GND) of

Vertical Threshold Adjustment

To compensate for optical noise presented on the data

logic high caused by EDFAs in a WDM transmission

system, an external analog control input is provided for

adjusting the data decision threshold to an optimum

level.

J17.

5) Place a shunt across pins 2 (RS2) and 3 (GND) of

J18.

6) Place a shunt across pins 2 (RATESET) and 3

(GND) of J19.

7) Place a shunt across pins 1 (VCC) and 2 (VCTRL)

of J9.

8) Remove the shunt from J10.

To enable data decision threshold adjustment, place a

shunt across pins 2 and 3 of J9 and shunt pins 1 and 2

of J10. Set the decision threshold by adjusting the

potentiometer R8. The center point for the decision

threshold is 1.2V at the VCTRL pin.

9) Place a shunt across pins 2 (FREFSET) and 3

(GND) of J12.

10) Connect a 2.48832Gbps PRBS NRZ signal to the

serial data inputs (SDI±) with 50Ω cables. Leave

the SLBI inputs unconnected.

11) Connect the serial data and clock outputs (SDO±,

SCLKO±) to a 50Ω high-speed oscilloscope.

Terminate any unused outputs with 50Ω to GND.

Jumpers, Controls, Test Points

Table 4 summarises the functions of all jumpers,

controls, and test points of the MAX3872/MAX3874 EV

Kit.

12) Connect +3.3V to J20 (VCC) and ground to J21

(GND).

2 ________________________________________________________________________________________

MAX3872/MAX3874 Evaluation Kits

Table 1. Operational Mode Settings

Table 2. Data Rate Settings

SHUNT POSITIONS

LREF (JU14) SIS (JU13)

SHUNT POSITIONS

INPUT DATA RATE

MODE

RS1

RS2

RATESET

1 and 2

2 and 3

1 and 2

2 and 3

1 and 2

2 and 3

2.666Gbps

2 and 3

1 and 2

2 and 3

1 and 2

2 and 3

1 and 2

2 and 3

Normal

1 and 2

2 and 3

1 and 2

2.488Gbps/2.5Gbps

1.244Gbps/1.25Gbps*

666.51Mbps*

System Loopback

(1 and 2) or

(2 and 3)

Clock Holdover

2 and 3

622.08Mbps*

166.63Mbps*

155.52Mbps*

*Setting not available on the MAX3874

Table 3. Clock Holdover Frequency Settings

SHUNT POSITIONS

REFERENCE CLOCK FREQUENCY

SCLKO FREQUENCY

RS1

RS2

RATESET

1 and 2

2 and 3

1 and 2

2 and 3

FREFSET

666.51MHz

2.666GHz

2 and 3

1 and 2

2 and 3

1 and 2

2 and 3

1 and 2

2 and 3

1 and 2

2 and 3

1 and 2

2 and 3

1 and 2

2 and 3

1 and 2

2 and 3

1 and 2

2 and 3

1 and 2

2 and 3

1 and 2

2 and 3

1 and 2

666.51MHz*

666.51MHz

666.51MHz*

166.63MHz

622.08MHz/625MHz*

622.08MHz/625MHz

622.08MHz*

1.244GHz/1.25GHz

2.488GHz/2.5GHz

622.08MHz

622.08MHz*

155.52MHz

166.63MHz

2.666GHz

166.63MHz*

666.51MHz

166.63MHz*

166.63MHz

155.52MHz/156.25MHz*

155.52MHz/156.25MHz

155.52MHz*

1.244GHz/1.25GHz

2.488GHz/2.5GHz

622.08MHz

155.52MHz*

155.52MHz

*Setting not available on the MAX3874

_________________________________________________________________________________________

MAX3872/MAX3874 Evaluation Kits

Table 4. Jumpers, Controls, Test Points

NAME

TYPE

DESCRIPTION

NORMAL POSITION

Enables/disables threshold adjust.

Shunt is required on J10 when threshold adjust is

enabled.

Shunt pins 1 and 2

3 Pin Header

Threshold control disabled

Connects VREF to VCTRL through R8 when

threshold adjust is enabled.

J10

J11

J12

2 Pin Header

3 Pin Header

Open

—

Not installed

Shunt pins 2 and 3

See Tables 2 and 3

Sets the reference clock frequency

Shunt pins 2 and 3

See Table 1

J13

J14

3 Pin Header

Selects between SDI and SLBI inputs

Enables/disables clock holdover mode

Shunt pins 1 and 2

See Table 1

Connects LOL to LREF for automatic clock holdover

mode or provides connection of J14 to LREF input.

Shunt pins 2 and 3

J15

J16

J17

3 Pin Header

2 Pin Header

3 Pin Header

LOL not connected to LREF

Not installed

Open

Shunt pins 2 and 3

See Tables 2 and 3

Multi-Rate Select Input 1

Shunt pins 2 and 3

See Tables 2 and 3

J18

J19

3 Pin Header

Multi-Rate Select Input 2

VCO Select Input

Shunt pins 2 and 3

See Tables 2 and 3

J20

J21

J22

J23

J24

Test Point

Power supply connection to VCC.

Power supply connection to GND.

Not installed

Connected to VCC

Connected to GND

2 Pin Header

Test Point

Open

—

Not installed

Threshold Control Potentiometer. Used in conjunction

with J10 and J9 to set the SDI input threshold.

Potentiometer

—

4 ________________________________________________________________________________________

MAX3872/MAX3874 Evaluation Kits

VCC_VCO

J20

56nH

0.1µF

1000pF

C11

1000pF

VCC

VCC_OUT

VCC

C14

33µF

C15

2.2µF

0.1µF

1000pF

C12

1000pF

56nH

J21

56nH

0.1µF

C10

1000pF

C13

1000pF

GND

C17

0.1µ F

OPEN

VCC

J24

J10

J22

50kΩ

J11

J12

VCC

VCC_OUT

J23

C22

0.1µF

OPEN

SDO+

VCC_OUT

0.1µF

VCC

SDI+

VCC

SDI+

VCC_OUT

SDO+

C24

0.1µF

OPEN

0.1µF

SDO-

SDI-

SLBI+

SLBI-

SDI-

SDO-

VCC

VCC_OUT

VCC_VCO

VCC_OUT

0.1µF

VCC

SLBI+

SLBI-

SIS

VCC_OUT

SCLKO+

SCLKO-

VCC_VCO

RATESET

MAX3872

C26

0.1µF

OPEN

0.1µF

SCLKO+

VCC_OUT

LREF

VCC

C28

0.1µF

OPEN

SCLKO-

J13

VCC

J15

J19

J16

J14

VCC

910Ω

C16

0.82µF

C18

0.1µF

C19

0.1µF

OPEN

VCC_VCO

J18

J25

J26

J17

OPEN

Figure 1. MAX3872 EV Kit Schematic

_________________________________________________________________________________________

MAX3872/MAX3874 Evaluation Kits

VCC_VCO

VCC_OUT

J20

56nH

0.1µF

1000pF

C11

1000pF

VCC

C14

C15

33µF

2.2µF

0.1µF

1000pF

C12

1000pF

56nH

VCC

J21

56nH

0.1µF

C10

1000pF

C13

1000pF

GND

C17

0.1µ F

OPEN

VCC

J24

J10

J22

50kΩ

J11

J12

VCC

VCC_OUT

J23

C22

0.1µF

OPEN

SDO+

VCC_OUT

0.1µF

VCC

SDI+

VCC

SDI+

VCC_OUT

SDO+

C24

0.1µF

OPEN

0.1µF

SDO-

SDI-

SLBI+

SLBI-

SDI-

SDO-

VCC

VCC_OUT

VCC_VCO

VCC_OUT

0.1µF

VCC

SLBI+

SLBI-

SIS

VCC_OUT

SCLKO+

SCLKO-

VCC_VCO

RATESET

MAX3874

C26

0.1µF

OPEN

0.1µF

SCLKO+

VCC_OUT

LREF

VCC

C28

0.1µF

OPEN

SCLKO-

J13

VCC

J15

J19

J16

J14

VCC

910Ω

C16

0.068µF

C18

0.1µF

C19

0.1µF

OPEN

VCC_VCO

J18

J25

J26

J17

OPEN

Figure 2. MAX3874 EV Kit Schematic

6 ________________________________________________________________________________________

MAX3872/MAX3874 Evaluation Kits

Figure 3. MAX3872/MAX3874 EV Kit Component

Placement Guide—Component Side

Figure 4. MAX3872/MAX3874 EV Kit PC Board Layout—

Component Side

Figure 5. MAX3872/MAX3874 EV Kit PC Board Layout—

Ground Plane

_________________________________________________________________________________________

MAX3872/MAX3874 Evaluation Kits

Figure 6. MAX3872/MAX3874 EV Kit PC Board Layout—

Power Plane

Figure 7. MAX3872/MAX3874 EV Kit PC Board 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.

8 ___________________ Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

 2003 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

MAX3874AEGJ [MAXIM]

相关型号：

MAX3874AEGJ-T

MAX3874AETJ+

MAX3874AETJ+D

MAX3874AETJ+TD

MAX3874EGJ

MAX3874EGJ-T

MAX3874EVKIT

MAX3875

MAX3875A

MAX3875AE/D

MAX3875AEHJ

MAX3875E/D