Microchip SY89537L Bruksanvisning
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SY89537L
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3.3V, Precision LVPECL and LVDS
Programmable Multiple Output Bank
Clock Synthesizer and Fanout Buffer
SY89537L Evaluation Board
March 2005
M9999-032205
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY89537L integrated, programmable clock
synthesizer and fanout buffer evaluation board is
designed for convenient setup and quick evaluation of
the device. The evaluation board has AC-coupled
outputs and is optimized to interface directly to 50Ω
test equipment. For increased flexibility, the
SY89537L evaluation board has both an on-board
16.6MHz series resonant crystal, and provisions to
accept an external reference input.
Data sheets and support documentation can be found
on Micrel's web site at: www.micrel.com .
Features
• Evaluation board for the 3.3V, precision LVPECL
and LVDS programmable multiple output bank
clock synthesizer and fanout buffer
• +3.3V ±10% power supply (+2.5V output capable)
• Loop filter configured for lowest total jitter and best
reference spur attenuation
• Loop filter reconfigurable for best stability and
ultra-low, cycle-to-cycle jitter
• AC-coupled output configuration for direct
interface to 50Ω equipment
• On board dip switches for ease of use
Related Documentation
•
SY89537L 3.3V, Precision LVPECL and LVDS
Programmable Multiple Output Bank Clock
Synthesizer and Fanout Buffer Data Sheet
____________________________________________________________________________________
Evaluation Board
Micrel, Inc.
SY89537L Evaluation Board
March 2005
M9999-032205
hbwhelp@micrel.com or (408) 955-1690
2
Evaluation Board Description
Crystal and DC-Coupled Reference Inputs
The SY89537L evaluation board is designed to
accept either a reference DC-coupled input or a
crystal, which is mounted on the evaluation board.
The DC-coupled reference input accepts any input
logic standard including single-ended and differential
TTL/CMOS, LVPECL, LVDS, HSTL, and SSTL.
External Loop Filter
The SY89537L features a user configurable external
loop filter. The evaluation board has been configured
for ultra-low total jitter and best reference spur
reduction. The evaluation board can be reconfigured
for best stability and ultra-low, cycle-to-cycle jitter by
substituting the pole capacitor C5 with a 100pF
capacitor.
AC-Coupled Output
The SY89537L is packaged in a 44-pin MLF™. The
SY89537L evaluation board is designed to operate
from a +3.3V or +2.5V source to power the output
buffers and from a +3.3V source to power the chip
core. The LVPECL and LVDS outputs are configured
in AC-coupled configuration designed to drive 50Ω
equipment.
Micrel, Inc.
SY89537L Evaluation Board
March 2005
M9999-032205
hbwhelp@micrel.com or (408) 955-1690
3
Evaluation Board
Power Supply V
CCA
,
V
CCD
V
CCO
GND
3.3V Core, 2.5V Output +3.3V +2.5V 0V
3.3V Core, 3.3V Output +3.3V +3.3V 0V
Table 1. AC-Coupled Evaluation Board Power Supply Connection
C5 (pF) Configuration
1000 Ultra-low total jitter and best spur reduction (default)
100 Ultra-low cycle-to-cycle jitter
Table 2. Loop Filter Configuration
Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | Inte kategoriserad |
| Modell: | SY89537L |
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