Microchip SY89826L Manual

Microchip Ikke kategoriseret SY89826L

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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

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

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

VCCI

LVDS_CLK

/LVDS_CLK

CLK_SEL

LVPECL_CLK

/LVPECL_CLK

GNDI

GNDO

/Q21

Q21

VCCO

GNDO

/Q7

/Q8

/Q9

Q10

/Q10

Q11

/Q11

Q12

/Q12

Q13

/Q13

GNDO

S39

S38

VCCO

/Q0

/Q1

/Q2

/Q3

/Q4

/Q5

/Q6

VCCO

/Q20

Q20

/Q19

Q19

/Q18

Q18

/Q17

Q17

/Q16

Q16

/Q15

Q15

/Q14

Q14

VCCO

S62S63

S25S24

U1 SY89826L

R16

82.5

R18

130

R15

82.5

R17

130

10k

CCI

C27

0.01 Fµ

C38

6.8 Fµ

CCO

C26

0.01 Fµ

C39

6.8 Fµ

SW Dip-6

C16

0.1 Fµ

C15

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

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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