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3HM572-BT-5.000R-D3

Description
Oscillator
CategoryPassive components    oscillator   
File Size618KB,5 Pages
ManufacturerMercury
Websitehttp://www.mercuryunited.com
Download Datasheet Parametric View All

3HM572-BT-5.000R-D3 Overview

Oscillator

3HM572-BT-5.000R-D3 Parametric

Parameter NameAttribute value
Objectid114070457
Reach Compliance Codecompliant
EMI Reduction Spread Spectrum Clock Oscillators
3HM572 Series Group “R”
The most efficient way to reduce EMI (Electromagnetic Interference) is to reduce it from its
principle source – the clock oscillator. Mercury 3HM572, an integrated clock module
composed of a spread spectrum clock and a quartz crystal, reduces EMI by 9 dB or more
while providing the clock speed needed for the system. It is a drop-in replacement for
standard 5x7 mm non-SSC clocks, no need to change the board or the solder pad layout.
The 3HM572 series (1.4 mm height) replaces the 3HM57 series (1.8 mm height). They are
identical products, with the only difference being the package heights. The 3HM57 is obsolete.
Please refer to Mercury
PCN-111004 “Change HM57 to HM572” .
MERCURY
Since 1973
Applications:
Printers; Multiple function printers (MPCs)
Digital copiers; PDAs
Networking; LAN / WAN; Routers
Storage systems
(CD-ROM,
VCD, DVD & HDD)
Scanner; Modems; Projectors
Hand-held ID Readers
Embedded systems; Electrical Musical Instrument
Automotive; GPS Car Navigation Systems
LCD PC Monitors / LCD TVs
ADSL; PCMCIA
Still Digital Cameras (SDCs)
Medical Devices
Spread Spectrum Clock (SSC):
Unlike the conventional clock, the mode
energy of a spread spectrum clock is
spread (distributed) over a wider
bandwidth between two pre-defined
frequency boundaries by the
frequency
modulation
technique. The modulation
carrier frequency is in the KHz range
which makes the modulation process
transparent to the oscillator frequency.
This controlled modulation process can
be on all of one side of the nominal
frequency (down
spread),
which is
preferred if system over-clocking is a
concern, or 50% up and 50% down
(center
spread).
Modulation Types
DOWN or CENTER spread
Down spread “D”.
“D1” as an example
Center spread “C”.
“C0.5” as an example
Output amplitude (dB) vs frequency span (MHz)
dB
EMI reduction
Conventional
Clock
dB
EMI reduction
Conventional
Clock
Spread
spectrum
clock
dB
fo - (fo*1%)
fc
Frequency
dB
fo - (fo*0.5%)
fo=fc
fo + (fo*0.5%)
32.768 MHz non-SSC vs SSC at Center Spread 1.5%:
No modulation
-9.9 dB
Center spread
1.5% (C1.5)
-23.0 dB
13.1 dB
reduction
Taiwan: TEL (886)-2-2406-2779, FAX (886)-2-2496-0769, e-mail:
sales-tw@mercury-crystal.com
U.S.A.: TEL (1)-909-466-0427, FAX (1)-909-466-0762, e-mail:
sales-us@mercury-crystal.com
MERCURY
Page 1 of 5
Oct. 18, 2011 Rev. 0
MERCURY
www.mercury-crystal.com
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