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Microchip Inte kategoriserad SY89829U

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1
M9999-070104
hbwhelp@micrel.com or (408) 955-1690
GENERAL DESCRIPTION
■SY89829U dual 1:10 fanout buer
■Single +2.5V or +3.3V power supply
■AC-coupled conguration for ease-of-use
■I/O interface includes onboard termination
■Fully assembled and tested
■Can be recongured for DC-coupled operation
FEATURES
2.5/3.3V HIGH-PERFORMANCE,
DUAL 1:10 LVPECL FANOUT BUFFER
WITH 2:1 MUX INPUT
Precision Edge™
SY89829U
Evaluation Board
Rev.: A Amendment: /0
Issue Date: July 2004
The SY89829U evaluation board is designed for
convenient set-up and quick evaluation of the SY89829U. It
allows the user to evaluate the part over its full voltage-
range without requiring any modications to the board.
The evaluation board standard configuration is AC-
coupled for direct interface to a 50 compatible oscilloscopeΩ
without split supplies. For applications that require a DC-
coupled configuration, step-by-step instructions for modifying
the board are included.
The board is fully assembled and tested.
All data sheets and support documentation can be found
on Micrel’s web site at www.micrel.com.
EVALUATION BOARD
Precision Edge is a trademark of Micrel, Inc.
AC-Coupled Evaluation Board
Part Number Function Data Sheet Link
SY89829U 2.5/3.3V, High-Performance, Low-Voltage PECL Bus www.micrel.com/product-info/products/sy89829u.shtml
Clock Driver and Translator w/Internal Termination Data Sheet
RELATED PRODUCT AND SUPPORT DOCUMENTATION
2
SY89829U Evaluation BoardMicrel
M9999-070104
hbwhelp@micrel.com or (408) 955-1690
EVALUATION BOARD DESCRIPTION
Direct 50Ω Scope Interface: AC-Coupled Evaluation
Board
The SY89829U is packaged in a 64-pin EPAD-TQFP
with the EPAD attached to a metal pad on the component
side of the board for improved heat dissipation. The two
high-speed clock inputs, LVDS_CLK and LVPECL_CLK are
brought out to SMA connectors through matched length
differential traces. Both LVPECL_CLK inputs are AC-coupled
on the board and biased with Thevenin Equivalent resistor
networks to supply the correct bias for the LVDS and
LVPECL levels. Three of the outputs, Q0, Q10, and Q16
are brought out through SMA connectors from three sides
of the chip. These LVPECL outputs are AC-coupled for
direct connection to an oscilloscope with a standard 50Ω
termination to Ground. The LVTTL/CMOS control inputs
are connected to a dipswitch on the board to allow the
different modes to be conveniently selected.
DC-Coupled Evaluation Board
For DC-coupled operation, the board can be modied to
use a direct connection to the dierential inputs from a
signal source such as an Agilent 8133A signal generator.
The common mode voltage levels for the inputs would need
to be set differently for the LVDS and LVPECL inputs. These
levels are specied in the “DC-Coupled Evaluation Board
Set-up” section. The outputs will still be congured for AC-
coupled operation.
Step-by-step instructions for modifying an AC-coupled
evaluation board for DC-coupled operation are supplied in
“Modifying your AC-Coupled Board for DC-Coupled
Operation” section.
S13
S8
S9
S12
S6
64
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
SEL2
LVDS_CLKB
/LVDS_CLKB
VCCI
LVDS_CLKA
/LVDS_CLKA
CLK_SEL1
LVPECL_CLKA
/LVPECL_CLKA
GND
OE1
LVPECL_CLKB
LVPECL_CLKB
CLK_SEL2
OE2
SEL1
VCCO
Q7
/Q7
Q8
/Q8
Q9
/Q9
VCCO
VCCO
Q10
/Q10
Q11
/Q11
Q12
/Q12
VCCO
S39
S38
VCCO
Q0
/Q0
Q1
/Q1
Q2
/Q2
Q3
/Q3
Q4
/Q4
Q5
/Q5
Q6
/Q6
VCCO
VCCO
/Q19
Q19
/Q18
Q18
/Q17
Q17
/Q16
Q16
/Q15
Q15
/Q14
Q14
/Q13
Q13
VCCO
S62S63
S2
S3
S5
S25S24
U1 SY89829U
S1
S2
S3
S4
S5
S6
V
CC
V
CCI
V
CCI
C29
0.01µF
C38
6.8µF
V
CCO
V
CCO
C28
0.01µF
C39
6.8µF
SW Dip-6
R1 R6–
10k
C5
C6
C7
C8
V
CC
R15
82.5
R17
130
V
CC
R16
82.5
R18
130
V
CC
R19
82.5
R21
130
V
CC
R20
82.5
R22
130
C9
0.1µF
C10
0.1µF
R30
180
R29
180
R30
180
R31
180
C12
0.1µF
C11
0.1µF
C16
0.1µF
C15
0.1µF
R37
180
R38
180
C3
C4
C1
C2
V
CCO
or V
CCI
C18, C20, C21, C22, C25,
C26, C27 are 0.1µF at power
pins 4, 17, 32, 33, 48, 49, 64
respectively.
Figure 1. AC-Coupled Evaluation Board Schematic
I/O VCCI VCCO GND
AC-Coupled Input/AC-Coupled Output +3.3V +3.3V 0V
Table 1. Evaluation Board Power Supply Connections
3
SY89829U Evaluation BoardMicrel
M9999-070104
hbwhelp@micrel.com or (408) 955-1690
EVALUATION BOARD SET-UP
AC-coupled I/O enables the evaluation board to operate
from a single power supply and interface directly to a 50Ω
scope. The following steps describe the procedure for setting
up the evaluation board for 3.3V operation. For 2.5V
operation, refer to the DC-Coupled Evaluation Board Set-“
up” instructions.
1. Set up a voltage source for 3.3V and turn o the
supply.
2. Connect the GND terminal to the negative side of
the power supply. This is the 0V ground potential.
3. Short the VCCI and VCCO terminals together on the
board and connect to the positive side of the 3.3V
supply. Turn on the power supply and verify that
the power supply current is <150mA.
4. Turn off the power supply.
5. Using a dierential signal source set the amplitude
of each side of the dierential pair to be 400mV
(800mV measured dierentially). Set the oset to
+1.2V. Turn o or disable the outputs of the signal
source.
6. Using equal length 50Ω impedance coaxial cables,
connect the signal source to one of the LVDS_CLK
inputs on the evaluation board (S2 and S3 or S5
and S6).
7. Using a second dierential signal source, set the
amplitude of each side of the dierential pair to
800mV (1600mV measured dierentially). Set the
oset to a positive value; the value of this oset is
not critical, as the AC-coupled inputs will be
automatically biased to the correct oset. Turn o
or disable the outputs of the signal source.
Switch Position Signal Name SY89829U Pin
SW1-1 SEL2 1
SW1-2 CLK_SEL1 7
SW1-3 OE1 11
SW1-4 CLK_SEL2 14
SW1-5 OE2 15
SW1-6 SEL1 16
Table 1. SW1 (DIP-6) Switch Settings
Note: Switch in ON position sets signal LOW.
8. Using equal length 50Ω impedance coaxial cables,
connect the signal source to one of the
LVPECL_CLK inputs on the evaluation board (S8
and S9 or S12 and S13).
9. Using equal length 50Ω impedance coaxial cables,
connect the outputs of the evaluation board (S24,
S25, S38, S39, S62 and S63) to the oscilloscope or
other measurement device that has an internal 50Ω
termination. If not all outputs are to be monitored,
the unused outputs must be terminated with 50 toΩ
ground.
10. Turn on the power.
11. Enable the signal source and monitor the outputs.
Refer to the table below:
EVALUATION BOARD LAYOUT
PC Board Layout
The evaluation boards are constructed with FRA material
and are coplanar in design and fabricated to minimize noise,
achieve high bandwidth and minimize crosstalk.
L1 Signal/GND
L2 Impedance GND
L3 VCCO Power
L4 VCCI Power
L5 GND
L6 Signal/GND
Table 2. Layer Stack

Produktspecifikationer

Varumärke: Microchip
Kategori: Inte kategoriserad
Modell: SY89829U

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