Micrel MMBT3906 Txrx 982 r1 evaluation board Datasheet

SY88973/SY88982/MIC3001-Based
SFP Module
TXRX_982_R1 Evaluation Board
General Description
Features
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.
•
Allows for easy and fast evaluation of Micrel’s
chipset for SFP module
•
On board FAULTs indicators
•
Easy access to the components for rework and
different options implementation
Data sheets and support documentation can be found
on Micrel’s web site at www.micrel.com.
Related Support Documentation
•
MIC3001 Data Sheet
•
SY89307 Data Sheet
•
SY89973 Data Sheet
•
MIC3000/1 Software User’s Guide
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.
•
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.
•
SY88973: Multi-rate 155-3200Mbps low
sensitivity limiting amplifier.
______________________________________________________________________________
Evaluation Board
ROSA
To Computer Parallel Port
TOSA
DFB / FP
DRIVER
INPUT
September 2004
L.A.
OUTPUT
M9999-092304
[email protected] 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 0 at
C24 and C38.
Driver and Laser
AC-Coupled
http://www.micrel.com/product-info/app_hints+notes.shtml.
TOSA and ROSA Installation
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.
Board
Edge
Table 1. Configuration Settings
Receiver Sensitivity and Hysteresis Setting
Top Pad
LD Anode
SY88973 Limiting Amplifier
Top Pad
LD Cathode
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
PD Cathode
Bottom Pad
NC
Bottom Pad
RSSI
Top Pad GND
Top Pad
DATA+
Bottom Pad
VCC
Figure 1. Mounting of Laser and Receive
http://www.micrel.com/product-info/app_hints+notes.shtml.
September 2004
2
M9999-092304
[email protected] 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.
d. Set FEEDBACK BIAS REF and RES
TERMINATION to GND and VBIAS
DRIVE to SOURCE (NPN). Set
INTERNAL FEEDBACK RESISTOR to
an arbitrary value (1.6K for example).
5. Pre-adjust the power supply to 3.3V and turn it
off. Connect TP3 to VCC (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.
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.
7. Refer to MIC3000/1 Software User’s Guide for
the detailed settings.
Set INTERNAL FEEDBACK
RESISTOR to arbitrary value (1.6K for
example).
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
occurrence. Close the window to return to
main window.
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.
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
Set Feedback voltage source to 1.22V.
3
M9999-092304
[email protected] or (408) 955-1690
Micrel
TXRX_982_R1 Evaluation Board
23. At this step, there is no received power since
no signal is applied at the input of the receiver.
18. On Panels list, select Temperature
Compensation. Load look-up tables for APC,
Modulation, Bias current Fault, and End-ofLife 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
registers. Checking them can mask the faults.
Return to the main window.
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.
Reconnect the VOA to the VCSEL and 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 SFF8472 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.
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
automatically changing the slope set in the
EXTERNAL CALIBRATION window.
Reconnect the VOA to the receiver and return
to the main window.
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:
a. In OEM settings window, set the bias
by entering a value from 10 to 255 in
APC SET POINT 0 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
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.
4
M9999-092304
[email protected] or (408) 955-1690
Micrel
TXRX_982_R1 Evaluation Board
Laser Response Tuning
Performance
Overshoot/Undershoot
Figure 2 shows an optical eye diagram obtained with
a Fabry Perrot laser driven differentially.
The damping resistors R8 and R24 installed in series
with laser are 20. 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 .
September 2004
TIME (67ps/div.)
Figure 2. Optical Eye Diagram
5
M9999-092304
[email protected] or (408) 955-1690
TXRX_982_R1 Evaluation Board
RSOUT
RXLOS
RSIN
TXDISABLE
TXFAULT
SHDN
Micrel
VCC_T
VCC_T
from sheet 2
VCC_T
R28
10K
R11
0Ω
JP4
HEADER 4
Q3
R22
10K
1
2
3
4
R33
10K
R18
10K
R34
10K
R21
10K
VCC_T
VCC_T
VCC_T
R49
10K
C10
0.1µF
R25
10K
R26
R31
Q4
14
3
16
4
17
5
18
6
5
4
3
2
FB
1
R17
47K
C13
0.1µF
R32
0Ω
R7
270
DATA
R39
0Ω
R29
10K
C38
0.1µF
50 Ohm TL
L7
OUT
OUT
/OUT
/OUT
R14
C24
12
11
10
C36
9
8
GND
7
GND
6
VCC
5
VCC
J3
VCC_T
13
13 GND
J2
1
GND
2
DIN
3
/DIN
4
GND
50 Ohm TL
R45
3.3Ω
C42
0.1µF
R24
R8
Q2
L2
14 VREF
15
IM_SET
16
/EN
C33
0.1µF
11
24
12
25
L1
VCC_T
C41
0.1µF
U4
SY88982
9
22
10
23
R52
1.5K
R12
1.5K
C35
0.1µF
R36
0Ω
R6
TBD
19
7
20
8
21
1
2
3
VCC_T
R4
TBD
VCC_T
J8
R53
0Ω
4
R27
TBD
C19
0.018µF
1
R20
270
R16
TBD
6
19 20 21 22 23 24
C26
0.1µF
8
VILD+
VILDVDDA
GNDA
VMPD
GNDD
17 NC
18 VDDD
J1
2
15
VIN
RSIN
C9
C37
0.1µF
25 Ohm TL
R19
10K
CLK
TXFAULT
XPN
VRX
SHDN
13
14
15
16
VMOD
C27
0.1µF
1
2
3
4
5
6
7
12 11 10 9 8 7
VCC_T
VMOD-
C28
1µF
16
VDD
A0
15
DATA A1
14
CLK
A2
13
/ALERT P0
12
P7
P1
11
P6
P2
10
P5
P3
9
P4
GND
VCC_T
TXDISABLE
VCC_T
U1
MIC74
RXLOS
RSOUT
COMP
VBIAS
VCC_T
L6
C12
0.1µF
U2
MIC3000-1
COMMON ANODE
+5V
VRX
VCC_T
25 Ohm TL
R15
L3
R13
TBD
L8
C32
0.1µF
VCC_T
Figure 2. Transmitter
VCC_T
3
C7
0.1µF
C2
VCC_R
VCC_R
C29
10µF
C30
10µF
C1
C23
0.1µF
TP6
L4
6 5 2 1
4
TP7
TP9
C31
10µF
Q5
MIC94052
+3.3
TP5
L5
R5
0Ω
U5
INA138
C3
5 V+
OUT 1
GND 2
4 VIN- VIN+ 3
VRX
to sheet 1
R47
10K
R42
160K
TP8
J6
VCC_R
C16
0.1µF
C34
1µF
C8
0.1µF
R48
1.5K
VCC_R
+5V
1
2
3
4
5
C17
0.1µF
R1
TBD
VCC_R
VCC_R
C20
0.1µF
C6
0.1µF
C14
0.1µF
12
DOUT
GND
10
GND
9
/DOUT
11
C18
0.1µF
1
DIN
2
GND
3
GND
4
/DIN
C15
0.1µF
8 7
50 Ohm TL
VCC_T
C25
0.1µF
VCC
LOS
CAP
VCC
J5
50 Ohm TL
13 14 15 16
/EN
VCC
50 Ohm TL
VCC
LOSLVL
J4
U3
SY88973
6 5
VCC_T
VCC_R
U6
74LCX04
C21
0.1µF
C5
0.1µF
VCC_R
Q1
R2
TBD
VCC_T
VCC_T
VCC_T
VCC_T
R50
270
R51
270
R37
270
R38
270
R9
270
R10
270
D3
D4
D5
D6
D7
D8
C4
0.1µF
VCC_R
C22
0.1µF
VCC_T
50 Ohm TL
from Sheet 1
SHDN
TXFAULT
TXDISABLE
RXLOS
RSIN
RSOUT
7
14
GND VCC
1
2
A0
/O0
3
4
A1
/O1
5
6
/O2
A2
9
8
/O5
A5
11
10
/O4
A4
13
12
/O3
A3
VCC_R
R3
TBD
R30
270
R23
10K
D9
Q6
NPN
Figure 3. Receiver
September 2004
6
M9999-092304
[email protected] or (408) 955-1690
Micrel
TXRX_982_R1 Evaluation Board
PCB Layout/Assembly
September 2004
7
M9999-092304
[email protected] or (408) 955-1690
Micrel
TXRX_982_R1 Evaluation Board
Bill of Materials
Driver AC-Coupled to the Laser
Item
Part Number
Manufacturer
(1)
Description
Qty.
C1–C6, C8, C10, C12–C18,
C20–C27, C32, C33,
C35–C38, C41, C42
Vishay
0.1µF, 25V, 10% Ceramic Capacitor, Size
0402
31
C19
Vishay(1)
0.01µF Ceramic Capacitor, Size 0402
1
C28, C34
Vishay(1)
1µF Ceramic Capacitor, Size 0603
2
10µF, Y, Tantalium Solid Electrolytic
Capacitor, Size 1206
1
Red, LED
7
Receptacle DB-25 R/A Connector, 25 Position
1
SMA End Launch Receptacle Connector
4
ROSA
1
C29-C31
ECSH0GY106R
D3-D9
67-1636-1-ND
Vishay
(1)
Digi-Key(2)
AMP
(3)
J1
745783
J2-J5
142-0711-821
Johnson
Components(4)
J6
D12M-9060-A
Luxnet(5)
(6)
J8
FOL137-xx-Oxx-x4
FP/DFB Laser, Common Anode
1
L1–L3, L6
BLM18HG102SN
Murata(7)
Inductor
4
L4, L5, L7, L8
IMC 0805 RK 122 J 01
Vishay(1)
1.2µH Ferrite Bead Inductor, Size 1206
2
Q2
MMBT3904
Fairchild
Semiconductor(8)
General Purpose NPN Transistor (SOT-23)
2
Q3
MMBT3906
Fairchild
Semiconductor(8)
General Purpose PNP Transistor (SOT-23)
2
R1, R18, R19, R21, R22,
R25, R28, R29, R33, R34,
R47, R49
CRCW04021002F
Vishay(1)
10k, 5% Resistor, Size 0402
12
R5, R11, R16, R27, R32,
R39, R53
CRCW04021002F
Vishay(1)
0, 1% Resistor, Size 0402
7
R6, R13
CRCW040275R0F
Vishay(1)
75.0, 1% Resistor, Size 0402
2
R7, R9, R10, R20, R30, R37,
R38, R50, R51
CRCW04022740F
Vishay
(1)
274, 5% Resistor, Size 0402
9
R8, R24
CRCW0402230R1F
Vishay(1)
30.1, 1% Resistor, Size 0402
2
R14, R15
CRCW040233R2F
Vishay(1)
33.2, 1% Resistor, Size 0402
2
R17
CRCW04024752F
Vishay
(1)
47K, 1% Resistor, Size 0402
2
R45
CRCW04023R32F
Vishay(1)
3.32, 1% Resistor, Size 0402
1
CRCW04021501F
(1)
1.5k, 5% Resistor, Size 0402
1
R48
Fitel
Vishay
(9)
TP3
5010
Keystone
Red, Color Coded PCB Test Point
1
TP5
5010
Keystone(9)
Black, Color Coded PCB Test Point
1
U1
MIC74
U2
U3
MIC3001
SY88973
Micrel(10)
2-Wire Serial I/O Expander
1
Micrel
(10)
Optical Transceiver Management IC
1
Micrel
(10)
3.2Gbps Limiting Post Amplifier
1
(10)
U4
SY88982
Micrel
Laser Driver
1
U5
INA138
TI (BurrBrown)(11)
High Side Measurement Current Shunt
Monitor
1
U6
74LCX04
Fairchild(8)
Low Voltage Hex Inverter with 5V
Tolerant Inputs
1
TXRX_982_R1
Micrel(10)
Bare PCB
1
September 2004
8
M9999-092304
[email protected] 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
9
M9999-092304
[email protected] 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: [email protected]
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.
© 2004 Micrel, Incorporated.
September 2004
10
M9999-092304
[email protected] or (408) 955-1690
Similar pages