Microchip SY89645L Manual

Microchip Ikke kategoriseret SY89645L

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Side 1/8

Precision Low Skew, 1-to-4 LVCMOS/LVTTL-

to-LVDS Fanout Buffer

SY89645L Evaluation Board

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

September 2006

M9999-091906-A

hbwhelp@micrel.com or (408) 955-1690

General Description

The SY89645L evaluation board is designed for

convenient setup and quick evaluation of the SY89645L

fanout buffer. The board is optimized to interface directly

to a 50Ω oscilloscope.

For quick and convenient evaluation of this part, the

board is AC-coupled. For applications that require a DC-

coupled configuration, step-by-step instructions for

modifying the board are included.

Features

• +3.3V power supply for the SY89645L

• AC-coupled configuration

• I/O interface includes on-board termination

• Fully assembled and tested

• Can be reconfigured for DC-coupled operation

Related Documentation

• SY89645L Precision Low Skew, 1-to-4

LVCMOS/LVTTL-to-LVDS Fanout Buffer Datasheet

_________________________________________________________________________________________________________

Evaluation Board

Micrel, Inc. SY89645L Evaluation Board

September 2006

2 M9999-091906-A

hbwhelp@micrel.com or (408) 955-1690

Evaluation Board Description

The default configuration for the SY89645L board is AC-

coupled. The choice between AC- and DC-coupled

configurations offers the user flexibility for specific

applications.

AC-Coupled Evaluation Board

The SY89645L default configuration is set up for AC-

coupled operation. In the AC-coupled configuration, the

output voltage offset is automatically adjusted to

interface directly with a 50Ω (to GND) scope.

For quick evaluation of the SY89645L, connect V

3.3V and V

and GND to 0V.

DC-Coupled Evaluation Board

The SY89645L evaluation board can be reconfigured for

DC-coupled operation. This can be accomplished by

modifying the board to use two power supplies into a

“split-supply configuration.” In order to correctly interface

LVDS to a 50Ω (to ground) scope, V

must be V

OCM

above the GND level. Therefore, a 3.3V supply will be

split into +1.2V and -2.1V to ensure proper V

to V

voltage difference.

Output Disable

The SY89645L provides a disable output function.

When CLK_EN is pulled HIGH, the output buffer is

disabled. Output Q switches to a LOW state and /Q

output switches to a HIGH state.

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	SY89645L

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