SY58032 [MICREL]
CML & LVPECL Fanout Buffer;
| 型号： | SY58032 |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | CML & LVPECL Fanout Buffer |
| 文件： | 总9页 (文件大小：1396K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
1:8 CML & LVPECL Fanout Buffer
SY58031/2/3U Evaluation Board
Features
General Description
• SY58031U, SY58032U, SY58033U
• +2.5V or +3.3V power supply
The SY58031U, SY58032U and SY58033U
evaluation boards are designed for convenient setup
and quick evaluation of the respective devices. The
boards are optimized to interface directly to a 50Ω
oscilloscope.
• AC-Coupled Input and DC-Coupled Output
configuration for performance
• Fully assembled and tested
For best AC performance, the boards are configured
with AC-Coupled Input and DC-Coupled Output. For
applications that require AC-coupled output
configuration, step-by-step instructions for modifying
the board are included.
• Outputs can be reconfigured for AC-coupled
output operation
Related Documentation
All data sheets and support documentation can be
found on Micrel’s web site at www.micrel.com.
• SY58031U, 3.3V/5V Ultra-Precision 1:8 CML
Fanout Buffer w/Internal Termination Data sheet
• SY58032U, 3.3V/5V Ultra-Precision 1:8 LVPECL
Fanout Buffer w/Internal Termination Data sheet
• SY58033U, 3.3V/5V Ultra-Precision 1:8 400mV
LVPECL Fanout Buffer w/Internal Termination
Data sheets
____________________________________________________________________________________
Evaluation Board
SY58032/3
SY58031
August 2004
M9999-080304
hbwhelp@micrel.com or (408) 955-1690
Micrel
SY58031/2/3 Evaluation Board
Evaluation Board Description
The SY58031U is a CML evaluation board and the
SY58032U and SY58033U are LVPECL and 400mV
LVPECL evaluation boards sharing the same design.
Therefore, a 3.3V supply will be split into +2V and
–1.3V, and a +2.5V supply will be split into +2V and
–0.5V. The +2V offset in the two-power supply
configuration provides the correct termination for the
device by setting the GND potential on the board to
2V below the VCC supply. The VEE voltage is then set
to –0.5V for 2.5V operation or –1.3V for 3.3V to
ensure proper VCC to VEE voltage difference.
The default configuration for these boards is AC-
coupled Input and DC-coupled output. The output can
be reconfigured for AC-coupled output operation;
therefore, the choice between two configurations
offers flexibility for specific applications.
Any-Input Interface
DC-Coupled Output
The unique internal input termination sets the input
common mode voltage. This enables the input to
interface with any differential signal over the supply
voltage without modifying the evaluation board
The DC-coupled configuration is an industry standard
configuration suited for enhanced AC performance.
The CML SY58031U requires a single power supply
of either 2.5V +5% or 3.3V +10% and offers the most
flexibility in interfacing to a variety of signal sources.
Since LVPECL is referenced to VCC, the standard
PECL termination is 50Ω to VCC–2V. Split supply is an
easy method to interface to a 50Ω (to ground) scope.
August 2004
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Micrel
SY58031/2/3 Evaluation Board
Evaluation Board
SY58031U CML Evaluation Board
I/O
Power
VCC
GND
VEE
C3-C8
Supply
AC-In/DC-Out
AC-In/DC-Out
AC-In/AC-Out
AC-In/AC-Out
2.5V
3.3V
2.5V
3.3V
+2V
+2V
0
0
0
0
–0.5
–1.3
0
0Ω
0Ω
+2.5V
+3.3V
0.1µF
0.1µF
0
Table 1. SY58031U Configuration
Note: The default configuration is AC-In/DC-Out.
August 2004
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Micrel
SY58031/2/3 Evaluation Board
SY58032/3U LVPECL Evaluation Board
I/O
Power
Supply
VCC
GND
VEE
R1-R6
C6-C7, C10-C11,
C16-C17
AC-In/DC-Out
AC-In/DC-Out
AC-In/AC-Out
AC-In/AC-Out
2.5V
3.3V
2.5V
3.3V
+2V
+2V
0
0
0
0
–0.5
–1.3
0
None
None
50Ω
0Ω
0Ω
+2.5V
+3.3V
0.1µF
0.1µF
0
100Ω
Table 2. SY58032/3U Configuration
Note: The default configuration is AC-In/DC-Out.
August 2004
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Micrel
SY58031/2/3 Evaluation Board
1. Signal Generator: Using a differential signal
source, set the amplitude of each side of the
differential pair to 400mV (800mV measured
differentially). Set the offset to a positive
value, the value of the offset is not critical,
since the AC-coupled inputs will be
automatically biased. Turn off or disable the
outputs of the signal source.
DC-Coupled Evaluation Board Setup
The follow steps describe the procedure for setting up
the evaluation board:
SY58031U
Set the voltage setting for the DC supply to either
2.5V or 3.3V depending on the application and turn
off the supply. Connect the GND terminal to the
negative side of a DC power supply. This is the 0V
ground potential. Connect the VCC terminal to the
positive side of a DC power supply.
2. I/O Cable Interface: Using equal length 50Ω
impedance coaxial cables connect the signal
source to the inputs on the evaluation board.
Using equal length 50Ω impedance coaxial
cables connect the outputs of the evaluation
board to the oscilloscope or other
measurement device that has an internal
50Ω termination. Unequal length cables are
not recommended since they introduce duty
cycle distortion and unwanted signal delays.
SY58032/3U
For 2.5V operation:
• VCC = 2.0V
• VEE = –0.5V
• GND = 0V
For 3.3V operation:
• VCC = 2.0V
3. Connect the trigger input of the scope to the
trigger output of the signal generator.
• VEE = –1.3V
• GND = 0V
4. Enable the signal source and monitor the
outputs.
August 2004
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Micrel
SY58031/2/3 Evaluation Board
Bill of Materials
SY58031U Evaluation Board
Item
Part Number
Manufacturer
Description
Qty.
C1-C2,C9-C16
VJ0402Y104KXXAT
Vishay(1)
0.1µF, 25V, 10% Ceramic Capacitor, Size
10
0402, X7R, Dielectric
C18,C21
VJ0402Y103KXXAT
Vishay(1)
0.01µF, 25V, 10% Ceramic Capacitor,
2
Size 0402, X7R, Dielectric
C3-C8
CRCW0402000Z
Vishay(1)
Vishay(1)
6
2
0Ω, 1/16W Resistor SMD, Size 0402
C19, C20
293D685X0025C2T
6.8µF, 20V, Tantalum Electrolytic
Capacitor, Size C
J1
J2
111-0703-001
111-0702-001
142-0701-851
Johnson Components(2)
Johnson Components(2)
Johnson Components(2)
Black Banana Jack
1
1
8
Red Banana Jack
SMA3, SMA6,
SMA10,
Jack Assembly End Launch SMA
SMA11, SMA21,
SMA22,
SMA28,SMA29
U1
SY58031U
Micrel, Inc.(3)
1:8 CML/LVPECL Fanout Buffer
1
Additional Components for AC-Coupled Outputs
Item
Part Number
Manufacturer
Description
Qty.
C3-C8
VJ0402Y104KXXAT
Vishay(1)
0.1µF, 25V, 10% Ceramic Capacitor, Size
6
0402, X7R, Dielectric
Notes:
1. Vishay: www.vishay.com
2. Johnson Components: www.johnsoncomponents.com
3. Micrel, Inc.: www.micrel.com
August 2004
6
M9999-080302
hbwhelp@micrel.com or (408) 955-1690
Micrel
SY58031/2/3 Evaluation Board
SY58032/3U Evaluation Board
Item
Part Number
Manufacturer
Description
Qty.
C2, C14
293D685X0025C2T
Vishay(1)
6.8µF, 20V, Tantalum Electrolytic
2
Capacitor, Size C
C3-C5,C8-
C9,C12-
C13,C18-C19
VJ0402Y104KXXAT
CRCW0402000Z
Vishay(1)
Vishay(1)
0.1µF, 25V, 10% Ceramic Capacitor, Size
9
0402, X7R, Dielectric
C6-C7,C10-C11,
C16-C17
6
0Ω, 1/16W Resistor SMD, Size 0402
J1
111-0703-001
111-0702-001
142-0701-851
SY58032/3U
Johnson Components(2)
Johnson Components(2)
Johnson Components(2)
Micrel, Inc.(3)
Black Banana Jack
1
2
8
1
J2, J3
Red Banana Jack
SMA1-SMA8
U1
Jack Assembly End Launch SMA
1:8 CML/LVPECL Fanout Buffer
Additional Components for AC-Coupled Outputs
Qty.
Item
Part Number
Manufacturer
Description
Vishay(1)
0.1µF, 25V, 10% Ceramic Capacitor, Size
6
C6-C7,C10-C11,
C16-C17
VJ0402Y104KXXAT
0402, X7R, Dielectric
Vishay(1)
10% 1/16W Resistor SMD, Size 0402(4)
4
R3-R6
CRCW040249R9F
CRCW04021000F
Notes:
1.
2.
3.
4.
Vishay: www.vishay.com
Johnson Components: www.johnsoncomponents.com
Micrel, Inc.: www.micrel.com
For 2.5V operation: R1-R6 are 50Ω resistors: For 3.3V operation: R1-R6 are 100Ω resistors
August 2004
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Micrel
SY58031/2/3 Evaluation Board
Evaluation Board Layout
Modifying DC-Coupled Outputs for
AC-Coupled Operation
PC Board Layout
The evaluation boards are constructed with Rogers
4003 material and are coplanar in design fabricated to
minimize noise, achieve high bandwidth and minimize
crosstalk.
SY58031U
1. Remove 0Ω resistors at C3, C4, C5, and C6.
2. Replace C3, C4, C5, and C6 with 0.1µF low
ESR, 0402 capacitors.
SY58032/3U
Layer
L1
SY58031U
VCC and Signal
GND
SY58032/3U
GND and Signal
GND
1. Remove 0Ω resistors at C6, C7, C10, C11,
C16, and C17.
L2
2. Replace at C6, C7, C10, C11, C16, and C17
L3
VCC
VCC
with 0.1µF low ESR, 0402 capacitors.
L4
GND
GND
3. For 2.5V operation: Add 50Ω 0402 pull-
down resistors to R1-R6.
Table 3. Layer Stack
For 3.3V operation: Add 100Ω 0402 pull-
down resistors to R1-R6.
August 2004
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Micrel
SY58031/2/3 Evaluation Board
Micrel Cross Reference
HBW Support
Hotline: 408-955-1690
To find an equivalent Micrel part, go to Micrel’s
website at: http://www.micrel.com and following the
steps below:
Email Support: HBWHelp@micrel.com
Application Hints and Notes
1. Click on Dynamic Cross Reference
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 Inc., website at
http://www.micrel.com/. Once in Micrel’s website,
follow the steps below:
2. Enter competitor’s part number in the
Dynamic Cross Reference field
3. To download a PDF version of this
information, click on the Cross Reference
PDF tab
1. Click on “Product Info”.
2. In the Applications Information Box, choose
“Application Hints and Application Notes.
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.
August 2004
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