Microchip SY89826L Handleiding

Microchip Niet gecategoriseerd SY89826L

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1
M9999-070104
hbwhelp@micrel.com or (408) 955-1690
GENERAL DESCRIPTION
■SY89826L 1:22 LVDS fanout buer
■Single +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
3.3V PRECISION 1:22 LVDS
FANOUT BUFFER/TRANSLATOR
WITH 2:1 INPUT MUX
Precision Edge™
SY89826L
Evaluation Board
Rev.: A Amendment: /0
Issue Date: July 2004
The SY89826L evaluation board is designed for
convenient setup and quick evaluation of the SY89826L. 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
SY89826L 3.3V, 1GHz Precision 1:22 LVDS Fanout Buer/Translator www.micrel.com/product-info/products/sy89826l.shtml
with 2:1 Input MUX Data Sheet
RELATED PRODUCT AND SUPPORT DOCUMENTATION
2
SY89826L Evaluation BoardMicrel
M9999-070104
hbwhelp@micrel.com or (408) 955-1690
EVALUATION BOARD DESCRIPTION
Direct 50Ω Scope Interface: AC-Coupled Evaluation
Board
The SY89826L 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. The LVPECL_CLK inputs are AC-coupled
on the board and biased with Thevenin Equivalent resistor
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
VCCO
GNDO
NC
VCCI
LVDS_CLK
/LVDS_CLK
CLK_SEL
LVPECL_CLK
/LVPECL_CLK
GNDI
OE
NC
GNDO
/Q21
Q21
VCCO
GNDO
Q7
/Q7
Q8
/Q8
Q9
/Q9
Q10
/Q10
Q11
/Q11
Q12
/Q12
Q13
/Q13
GNDO
S39
S38
VCCO
Q0
/Q0
Q1
/Q1
Q2
/Q2
Q3
/Q3
Q4
/Q4
Q5
/Q5
Q6
/Q6
VCCO
VCCO
/Q20
Q20
/Q19
Q19
/Q18
Q18
/Q17
Q17
/Q16
Q16
/Q15
Q15
/Q14
Q14
VCCO
S62S63
S5
S6
S8
S5
S25S24
U1 SY89826L
V
CC
V
CC
R16
82.5
R18
130
R15
82.5
R17
130
C5
C6
S1
S2
S3
S4
S5
S6
V
CC
R2
10k
R3
10k
V
CCI
V
CCI
C27
0.01 Fµ
C38
6.8 Fµ
V
CCO
V
CCO
C26
0.01 Fµ
C39
6.8 Fµ
SW Dip-6
C16
0.1 Fµ
C15
0.1 Fµ
C9
0.1 Fµ
C10
0.1 Fµ
C12
0.1 Fµ
C11
0.1 Fµ
Note: Output load resistors
R32 R40 and R43 R50 are 100 .– –
R32 R33 R34 R35 R36 R37
R47 R46 R45R50 R49 R48
R44
R43
R41
R40
R39
R38
C3
C4
V
CCO
or V
CCI
C17, C18, C19, C20, C21,
C24, C25, are 0.1 F at power µ
pins 1, 4, 16, 17, 32,
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
networks to supply the correct bias for the LVPECL levels.
Three of the outputs Q0, Q9, and Q17 are brought out
through SMA connectors from three sides of the chip. These
LVDS outputs are AC-coupled for direct connection to an
oscilloscope with a standard 50 termination to Ground.Ω
The LVTTL/CMOS control inputs OE and CLK_SEL are
connected to a dipswitch on the board to allow the dierent
modes to be conveniently selected.
3
SY89826L 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 3.3V supply and interface directly to a 50Ω
scope. The following steps describe the procedure for setting
up the evaluation board.
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 (S5 and S6).
Switch Position Signal Name SY89826L Pin
SW1-1 — —
SW1-2 CLK_SEL 7
SW1-3 OE 11
SW1-4 — —
SW1-5 — —
SW1-6 — —
Table 1. SW1 (DIP-6) Switch Settings
Note: Switch in ON position sets signal LOW.
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.
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).
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 moni-
tored, the unused outputs must be terminated with
50Ω to 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

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: SY89826L

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