Microchip SY89826L Manual

Microchip Ikke kategoriseret 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.

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: SY89826L

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