INA138 [MICREL]

TXRX_982_R1 Evaluation Board; TXRX_982_R1评估板


型号：	INA138
厂家：	MICREL SEMICONDUCTOR
描述：	TXRX_982_R1 Evaluation Board TXRX_982_R1评估板
文件：	总10页 (文件大小：1976K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SY88973/SY88982/MIC3001-Based

SFP Module

TXRX_982_R1 Evaluation Board

Features

General Description

•

Allows for easy and fast evaluation of Micrel’s

chipset for SFP module

This evaluation board is an implementation of the

SFP module in a different form factor with on board

faults indicators (LEDs) and a DB-25 connector for

serial communication. The design uses Micrel's

MIC3001 controller, SY88982 (pin compatible with

SY88782 and SY88932) driver, and SY88973 limiting

amplifier. A picture of the fully bonded board is

shown below.

•

On board FAULTs indicators

Easy access to the components for rework and

different options implementation

IC Description

•

SY88982: Low power small form factor (3mm x

3mm) laser driver up to 3.2Gbps data rate and

2.3V compliance voltage. SY88782 is a lower

speed version up to 1.25Gbps.

Data sheets and support documentation can be found

on Micrel’s web site at www.micrel.com.

Related Support Documentation

MIC3001: SFP module controller featuring digital

diagnostic monitoring interface as per SFF-8472

with internal/external calibration and full laser

control with bias and modulation current

compensation for temperature variations using

look up tables.

•

MIC3001 Data Sheet

SY89307 Data Sheet

SY89973 Data Sheet

MIC3000/1 Software User’s Guide

•

SY88973: Multi-rate 155-3200Mbps low

sensitivity limiting amplifier.

______________________________________________________________________________

Evaluation Board

TOSA

ROSA

DFB / FP

DRIVER

INPUT

L.A.

OUTPUT

September 2004

M9999-092304

hbwhelp@micrel.com or (408) 955-1690

Micrel

TXRX_982_R1 Evaluation Board

SY88843 Limiting Amplifier

Evaluation Board Setting

The SY88843 limiting amplifier has a signal detect

(SD) indicator. To improve the hysteresis on the

receive signal LOS, remove R2 and install R3, Q6,

and R23. The combination of R3 and R1 will

determine the sensitivity of the transceiver and

hysteresis on the SD. Refer to the application note

entitled "Notes on Sensitivity and hysteresis in

Micrel's Post Amplifiers" available at

Driver Laser Coupling

Table 1 summarizes the setting of the board for the

two configurations, driver DC-coupled or AC-coupled

to the laser.

Configuration

Remove

Install

Driver and Laser

DC-Coupled

L2, L3, L7, L8,

R14, R6, R13,

C24, C36

Install a 0ꢀ at

C24 and C38.

http://www.micrel.com/product-info/app_hints+notes.shtml.

TOSA and ROSA Installation

Driver and Laser

AC-Coupled

L2, L3, L7, L8,

R14, R6, R13,

C24, C36

Check the pinout of the laser and receiver and install

them accordingly to the diagrams shown on Figure 1.

Table 1. Configuration Settings

Bottom Pad

PD Cathode

LD Anode

Top Pad

Receiver Sensitivity and Hysteresis Setting

SY88973 Limiting Amplifier

Top Pad

LD Cathode

Bottom Pad

The SY88973 limiting amplifier is the default post

amplifier installed on the board. It has a receive signal

LOS indicator. To improve the hysteresis on the

receive signal LOS, install R2 and uninstall R3. The

combination of R2 and R1 will determine the

sensitivity of the transceiver and hysteresis on the

receive signal LOS. Refer to the application note

entitled "Notes on Sensitivity and hysteresis in

Micrel's Post Amplifiers" available at

Top Pad

DATA-

Bottom Pad

RSSI

Top Pad GND

Top Pad

Bottom Pad

DATA+

VCC

Figure 1. Mounting of Laser and Receive

http://www.micrel.com/product-info/app_hints+notes.shtml.

September 2004

M9999-092304

hbwhelp@micrel.com or (408) 955-1690

Micrel

TXRX_982_R1 Evaluation Board

12. In OEM Configuration Register 0 window,

set ENABLE/DISABLE to DISABLE, VMOD

REFERENCE to GND, and temperature

zone to INTERNAL.

Set-Up and Operation

Follow the step-by-step procedure to set-up the board

safely and properly:

1. Connect the on board DB-25 connector to the

parallel port of a computer.

13. In OEM Configuration Register 1 window:

a. Set APC OP-AMP TYPE to COMMON

EMITTER.

Note: Set the selection bit to 0, 0 should correspond

to EMITTER FOLLOWER, which should be displayed

on the bottom and COMMON EMITTER on the top.

2. Connect the differential input of the laser

driver to DATA output of the pattern generator.

3. Use a multimode fiber jumper, with

appropriate connectors to connect optical

output of the VCSEL to a VOA (variable

optical attenuator) preset to 0dB attenuation.

b. Select the voltage to report in

VINH:VINL.

4. Connect the output of the VOA to the optical

input of the DCA, power-meter, or optical to

electrical converter.

c. Set Feedback voltage source to 1.22V.

d. Set FEEDBACK BIAS REF and RES

TERMINATION to GND and VBIAS

DRIVE to SOURCE (NPN). Set

5. Pre-adjust the power supply to 3.3V and turn it

off. Connect TP3 to V_CC(3.3V) and TP5 to

GND, then turn the power supply ON. The

total current drawn from the power supply

should be less than 300mA.

INTERNAL FEEDBACK RESISTOR to

an arbitrary value (1.6K for example).

e. Set FEEDBACK BIAS REF and RES

TERMINATION to GND and VBIAS

DRIVE to SOURCE (NPN).

6. Launch the MIC3000/1 software. The

MIC3001 Optical Transceiver Management

IC panel opens with Panels and Help grayed

out and only Utilities can be run.

f. Set INTERNAL FEEDBACK

RESISTOR to arbitrary value (1.6K for

example).

7. Refer to MIC3000/1 Software User’s Guide for

the detailed settings.

14. In OEM Configuration Register 2, the

MIC3001 address and look-up table offset can

be modified. The look-up table covers 128°C.

The temperature range for offset = 0 is 0° to

+127°C.) This range can be shifted down by

2x the value. The offset is set to. If offset = 15,

the temperature range becomes –30° to

+97°C.

8. On the main window select Utilities to open

the utilities panel, then select SCAN to read

the address of the MIC3001 and GET to read

the manufacturer ID, Device ID, and Die

Revision. If there is a failure in reading one of

these parameters, you cannot proceed further.

If all the parameters are read correctly, close

the Utilities window to return to the main

window where Panels and Help are no longer

grayed out.

15. In OEM Configuration Register 0 window,

set ENABLE/DISABLE to ENABLE.

16. On Panels list select OEM CONFIG 3-4 and

select EXTERNAL CALIBRATION (default

setting), LOS COMPARATOR ENABLE,

SHDN, RXLUT INPUT TEMPERATURE, and

RSOUT. If needed, later set ISTART to a

different value to speed up the APC loop

during laser turn ON after a FAULT

9. Select Panels to display the list of setting

panels.

10. All the bits displayed on the panels can be

read and/or modified on the panels or by

accessing the registers directly by selecting

ALL REGISTERS, enter the serial address,

the register address, select GET to read the

content or type a value and select SET NEW

to write. In this procedure the bits are set on

the panels.

occurrence. Close the window to return to

main window.

17. On Panels list, select External Calibration.

Set all the offsets to 0 and slopes to 1. Set

RX_PWR(1) to 1. These parameters might

need to be changed later to correct the

measured values (calibration). Return to the

main window.

11. Select OEM CONFIG 0-2 to open the OEM

configuration registers 0, 1, and 2 windows.

September 2004

M9999-092304

hbwhelp@micrel.com or (408) 955-1690

Micrel

TXRX_982_R1 Evaluation Board

18. On Panels list, select Temperature

23. At this step, there is no received power since

no signal is applied at the input of the receiver.

Compensation. Load look-up tables for APC,

Modulation, Bias current Fault, and End-of-

Life from appropriate files. If no loading is

done, the default value 0 is used for all the

LUT. Return to the main window.

24. Adjust the VOA to bring the optical power to

the desired level at the input of the receiver.

Then connect the output of the VOA to the

input of the receiver using appropriate fiber

jumper.

19. On Panels list, select OEM settings. Enter

the desired DAC values between 0 and 255

for the displayed parameters then select SET

NEW. Select GET CURRENT to make sure

that the set values are written into the

25. If the installed receiver has RSSI signal, a

value (needs calibration) of the received

power should be displayed now.

26. On Panels list, select TX Setup to calibrate

the TX power. Measure the optical power at

the output of the VCSEL and enter the value

(in mW) in the MEASURED TX POWER box,

then select CALIBRATE. The monitored value

is adjusted to display the measured value by

automatically changing the slope set in the

EXTERNAL CALIBRATION window.

registers. Checking them can mask the faults.

Return to the main window.

20. On Panels list, select User. Check APC0 in

the USER CONTROL REGISTER (default

setting). All the other parameters can be

checked later to verify their functionality.

Return to the main window.

21. On Panels list, select Result. The values of

the five monitored parameters as per SFF-

8472 are now displayed. Type the alarm and

warning thresholds and select SET NEW

LIMITS. Select GET CURRENT LIMITS to

check that the set values are written into the

registers. Return to main window.

Reconnect the VOA to the VCSEL and return

to the main window.

27. On Panels select RX Calibration. Measure

the input power to receiver at the output of the

VOA and enter the measured value (in mW) in

the MEASURED RX POWER box then select

CALIBRATE. The monitored value is adjusted

to display the measured value by

22. Set modulation current and bias current to get

the desired output power and extinction ratio

out of the laser. Use OEM Settings panel or

TX Setup panel to do that:

automatically changing the slope set in the

EXTERNAL CALIBRATION window.

Reconnect the VOA to the receiver and return

to the main window.

a. In OEM settings window, set the bias

by entering a value from 10 to 255 in

28. At this stage, the masked faults should be

unmasked and if there is a fault indication try

to find the cause for it and fix it to get the

transceiver running fault free and try to

measure the performance of the laser driver

and post amplifier.

APC SET POINT

box and

modulation by entering a value from

10 to 255 in MOD DAC setting box

followed by SET new.

b. In TX calibration window, set the bias

by entering a value from 10 to 255 in

APCO (DEC) box and modulation by

entering a value from 10 to 255 in

MOD DAC setting box followed by

SET new.

After setting the new value for bias or modulation

current, toggle TXDISABLE/TXENABLE on the main

window.

September 2004

M9999-092304

hbwhelp@micrel.com or (408) 955-1690

Micrel

TXRX_982_R1 Evaluation Board

Laser Response Tuning

Performance

Figure 2 shows an optical eye diagram obtained with

a Fabry Perrot laser driven differentially.

Overshoot/Undershoot

The damping resistors R8 and R24 installed in series

with laser are 20ꢀ. This value might be tuned to a

higher value to minimize or suppress any overshoot

or undershoot on the optical signal out of the laser,

but keep in mind that higher value damping resistors

will lead to higher rise/fall time.

(2.5Gbps), PRBS 2²³–1, ER = 9.5

Laser's Package Inductance Compensation

A compensation network comprised of C9/R26 or

C9/R31 can be used to compensate for the laser

package inductance. R26 and R31 share the same

pad on the board, so only one at a time can be

installed. The values shown on the schematic are

used for the symbol only. C9 should be a few pF and

R26/R31 around 50 ꢀ.

TIME (67ps/div.)

Figure 2. Optical Eye Diagram

September 2004

M9999-092304

hbwhelp@micrel.com or (408) 955-1690

Micrel

TXRX_982_R1 Evaluation Board

_CC_T

V_CC_T

VRX

from sheet 2

V_CC_T

_CC_T

+5V

R28

10K

R11

V_CC_T

JP4

0Ω

HEADER 4

R33 R34 R21

10K 10K 10K

R49

10K

R22 R18

10K 10K

C10

R26

0.1µF

R25

10K

R31

C12

0.1µF

MIC3000-1

C37

0.1µF

12 11 10

9 8 7

V_CC_T

_CC_T

MIC74

CLK

R16

TBD

R53

0Ω

VILD+

VILD-

VDDA

GNDA

VMPD

VIN

RSIN

GNDD

VDD

R19

10K

DATA A1

CLK A2

/ALERT P0

R52

1.5K

VDDD

R12

1.5K

C28

1µF

C27

0.1µF

C35

0.1µF

C13

0.1µF

19 20 21 22 23 24

R32

0Ω

C26

0.1µF

R24

GND

R27

TBD

C19

0.018µF

V_CC_T

R45

3.3Ω

R17

47K

R20

270

C42

0.1µF

R36

0Ω

TBD

R39

0Ω

V_CC_T

C41

0.1µF

270

R29

10K

SY88982

R14

C24

C33

0.1µF

OUT

GND

50 Ohm TL

DIN

/OUT

C36

/DIN

GND

C38

0.1µF

50 Ohm TL

25 Ohm TL

V_CC_T

R15

C32

0.1µF

R13

TBD

V_CC_T

Figure 2. Transmitter

V_CC_T

TP5

0Ω

_CC_R

C31

_CC_R

10µF

C23

0.1µF

+3.3

MIC94052

TP6

TP7

INA138

TP9

C29

10µF

C30

10µF

0.1µF

V+

OUT

GND

VRX

to sheet 1

VIN- VIN+

R47

10K

R42

160K

0.1µF

R48

1.5K

_CC_R

+5V

TP8

V_CC_R

C17

C16

0.1µF

C20

0.1µF

TBD

C34

1µF

V_CC_R

0.1µF

SY88973

13 14 15 16

C14

0.1µF

C18

0.1µF

J4 50 Ohm TL

50 Ohm TL

DOUT

DIN

GND

/DIN

GND

_CC_T V_CC_T V_CC_T V_CC_T V_CC_T V_CC_T

GND

/DOUT

C25

50 Ohm TL

C15

0.1µF

R50

270

R51

270

R37

270

R38

270

R10

270

V_CC_T

V_CC_R

0.1µF

V_CC_R

C22

0.1µF

C21

0.1µF

74LCX04

0.1µF

from Sheet 1

GND VCC

/O0

/O1

/O2

/O5

/O4

/O3

V_CC_R

SHDN

TXFAULT

TXDISABLE

RXLOS

RSIN

TBD

RSOUT

V_CC_R

TBD

R30

270

R23

10K

NPN

Figure 3. Receiver

September 2004

M9999-092304

hbwhelp@micrel.com or (408) 955-1690

Micrel

TXRX_982_R1 Evaluation Board

PCB Layout/Assembly

September 2004

M9999-092304

hbwhelp@micrel.com or (408) 955-1690

Micrel

TXRX_982_R1 Evaluation Board

Bill of Materials

Driver AC-Coupled to the Laser

Item

Part Number

Manufacturer

Description

Qty.

C1–C6, C8, C10, C12–C18,

C20–C27, C32, C33,

Vishay⁽¹⁾

0.1µF, 25V, 10% Ceramic Capacitor, Size

0402

C35–C38, C41, C42

C19

Vishay⁽¹⁾

0.01µF Ceramic Capacitor, Size 0402

1µF Ceramic Capacitor, Size 0603

C28, C34

C29-C31

Vishay⁽¹⁾

ECSH0GY106R

10µF, Y, Tantalium Solid Electrolytic

Capacitor, Size 1206

D3-D9

67-1636-1-ND

745783

Digi-Key⁽²⁾

AMP⁽³⁾

Red, LED

Receptacle DB-25 R/A Connector, 25 Position

SMA End Launch Receptacle Connector

J2-J5

142-0711-821

Johnson

Components⁽⁴⁾

D12M-9060-A

Luxnet⁽⁵⁾

Fitel⁽⁶⁾

ROSA

FOL137-xx-Oxx-x4

BLM18HG102SN

IMC 0805 RK 122 J 01

MMBT3904

FP/DFB Laser, Common Anode

Inductor

L1–L3, L6

L4, L5, L7, L8

Murata⁽⁷⁾

Vishay⁽¹⁾

1.2µH Ferrite Bead Inductor, Size 1206

General Purpose NPN Transistor (SOT-23)

Fairchild

Semiconductor⁽⁸⁾

MMBT3906

Fairchild

Semiconductor⁽⁸⁾

General Purpose PNP Transistor (SOT-23)

R1, R18, R19, R21, R22,

R25, R28, R29, R33, R34,

R47, R49

CRCW04021002F

Vishay⁽¹⁾

10kꢀ, 5% Resistor, Size 0402

R5, R11, R16, R27, R32,

R39, R53

CRCW04021002F

Vishay⁽¹⁾

0ꢀ, 1% Resistor, Size 0402

R6, R13

CRCW040275R0F

CRCW04022740F

Vishay⁽¹⁾

75.0ꢀ, 1% Resistor, Size 0402

274ꢀ, 5% Resistor, Size 0402

R7, R9, R10, R20, R30, R37,

R38, R50, R51

R8, R24

R14, R15

R17

CRCW0402230R1F

CRCW040233R2F

CRCW04024752F

CRCW04023R32F

CRCW04021501F

Vishay⁽¹⁾

30.1ꢀ, 1% Resistor, Size 0402

33.2ꢀ, 1% Resistor, Size 0402

47Kꢀ, 1% Resistor, Size 0402

3.32ꢀ, 1% Resistor, Size 0402

1.5kꢀ, 5% Resistor, Size 0402

R45

R48

TP3

TP5

5010

Keystone⁽⁹⁾

Micrel⁽¹⁰⁾

Red, Color Coded PCB Test Point

Black, Color Coded PCB Test Point

2-Wire Serial I/O Expander

Optical Transceiver Management IC

3.2Gbps Limiting Post Amplifier

Laser Driver

5010

MIC74

MIC3001

SY88973

SY88982

INA138

TI (Burr-

Brown)⁽¹¹⁾

High Side Measurement Current Shunt

Monitor

74LCX04

Fairchild⁽⁸⁾

Low Voltage Hex Inverter with 5V

Tolerant Inputs

TXRX_982_R1

Micrel⁽¹⁰⁾

Bare PCB

September 2004

M9999-092304

hbwhelp@micrel.com or (408) 955-1690

Micrel

TXRX_982_R1 Evaluation Board

Notes:

1. Vishay: www.vishay.com

2. Digi-Key: www.digikey.com

3. AMP: www.amp.com

4. Johnson Components: www.johnsoncomponents.com

5. Luxnet: www.luxnetcorp.com

6. Honeywell: www.furukawa.com

7. Murata: www.murata.com

8. Fairchild Semiconductor: www.fairchildsemi.com

9. Keystone: www.keystone.com

10. Micrel, Inc.: www.micrel.com

11. TI: www. ti.com

September 2004

M9999-092304

hbwhelp@micrel.com or (408) 955-1690

Micrel

TXRX_982_R1 Evaluation Board

Micrel Cross Reference

Application Hints and Notes

To find an equivalent Micrel part, go to Micrel’s

website at: http://www.micrel.com and follow the

steps below:

For application notes on high speed termination on

PECL and LVPECL products, clock synthesizer

products, SONET jitter measurement, and other High

Bandwidth product go to Micrel Semiconductors’

website at http://www.micrel.com/. Once in Micrel’s

website, follow the steps below:

1. Click on Dynamic Cross Reference.

2. Enter competitor’s part number in the Dynamic

Cross Reference field.

1. Click on “Product Info”.

2. In the Applications Information Box, choose

“Application Hints and Application Notes.”

3. To download a PDF version of this

information, click on the Cross Reference PDF

tab.

HBW Support

Hotline: 408-955-1690

Email Support: HBWHelp@micrel.com

MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com

The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for

its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.

Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a

product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for

surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant

injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk

and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale.

September 2004

M9999-092304

hbwhelp@micrel.com or (408) 955-1690

INA138 [MICREL]

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