3HM53 Group “R” A DROP-IN REPLACEMENT SOLUTION FOR

3HM53 Group “R”
A DROP-IN REPLACEMENT SOLUTION FOR YOUR
EMI / EMC COMPLIANCE PROBLEM
The principle sources of the EMI problem
come from the system clocks. Therefore, rather
than patch the problem with ferrite beads, EMI
filters, ground plane and metal shielding, the most
efficient and economic way to reduce the peak
radiation energy is to use the low EMI clock
oscillator.
Compared with the conventional clock
oscillators, Mercury HM53 series spread spectrum
(dithered) clock oscillators can reduce EMI as
much as 12 dB. The beauty is it is a drop-in
replacement for your existing 5x7 clock oscillator.
No need to re-spin the board.
3HM53 reduces your EMI
and shorten your time to market.
Applications
◘ Printers; Multiple function printers (MPCs)
◘ Digital copiers; PDAs
◘ Networking; LAN / WAN; Routers
◘ Storage systems (CD-ROM, VCD, DVD and HDD)
◘ Scanner; Modems; projectors
◘ Hand-held ID readers
Modulation Types
◘ Embedded systems; Electrical musical instrument
◘ Automotive; GPS car navigation systems
◘ LCD PC monitors / LCD TVs
◘ ADSL; PCMCIA
◘ Still Digital cameras (SDCs)
Output amplitude (dB) vs frequency span (MHz)
Down spread “D”. “D1” as an example
Center spread “C”. “C0.5” as an example
Conventional
Clock
dB
EMI reduction
fo - (fo*1%)
Spread
spectrum
clock
fc
Frequency
Conventional
Clock
EMI reduction
fo - (fo*0.5%)
MERCURY
fo=fc
fo + (fo*0.5%)
www.mercury-crystal.com
Spread Spectrum Clock (SSC):
Unlike the conventional clock, the
mode energy of a spread spectrum
clock is spread over a wider
bandwidth, resulting from the
frequency modulation technique. The
modulation carrier frequency is in the
KHz range which makes the
modulation process transparent to the
oscillator frequency. The controlled
modulation process can be on all of
one side of the nominal frequency
(down spread) or 50% up and 50%
down (center spread). The down
spread is preferred if over-clocking is
a problem to the system.
Taiwan: TEL (886)-2-2406-2779, FAX (886)-2-2496-0769, e-mail: [email protected]
U.S.A.: TEL (1)-909-466-0427, FAX (1)-909-466-0762, e-mail: [email protected]
Page 1 of 5
April. 19. 2005 Rev. C
General Specifications: at Ta=+25°C, CL=15 pF
Mercury Model
Frequency Range
Spread Type
Spread Percentage
(Part number suffix)
(tolerance : ±2% of the total %
EMI Reduction
(Reduction is applied to the
entire spectrum)
3HM53 Group “R”
6.0 ~160.0 MHz
Total % Down Spread (D) Center Spread (C)
Modulation Carrier Frequency
(Dither rate)
Output Logic
Input Voltage (VDD)
Output Voltage “High”; “1”
6.9 KHz min.; 55.5 KHz max.;
Frequency dependent. Call for details.
CMOS Square Wave
VDD = +3.3 V D.C. ±5%
Commercial (0°C to +70°C):
“A”: ±25 ppm ; “B’: ±50 ppm; “C”:±100 ppm
Industrial (-40°C to +85°C):
“D”: ±25 ppm ; “E’: ±50 ppm; “F”:±100 ppm
2.0 V min.; 3.2 V typical (at 90% VDD)
Output Voltage “Low”; “0”
0.8 V max. ; 0.2 V typical (at 10% VDD)
Rise Time / Fall Time
4 n sec. max. (10% VDD ↔ 90% VDD)
15 pF
2 ms typical; 5 ms max.
2 ms max.
10.0 MHz: 7 mA; 32.768 MHz: 8 mA
75.0 MHz: 17 mA; 125 MHz: 18 mA
50%±5%. ( CL=15 pF ;at 50% VDD)
±250 ps typical; ±300 ps max.
40 ohms typical
>2000 V (per MIL-STD-883, method 3015)
-65°C to +150°C
±5 ppm per year max.; Ta=+25°C
16 mm tape and reel. 1000 pcs per reel
Output is high impedance when taken low.
Output enable /disable time: 100 ns max.
Frequency Stability
(exclude modulation)
Load
Start-up Time
Stabilization Time
Current Consumption
Duty Cycle
Cycle-to-cycle Jitter
Output Impedance
Static Discharge Voltage
Storage Temperature
Aging
Packaging
Pin 1 Function
1%
-1% (D1)
±0.5 (C0.5)
3%
-3% (D3)
±1.5 (C1.5)
-9 dBc min. 100 MHz at C0.5
-15 dBc min. 100 MHz at C1.5
With respect to the dB level when no modulation.
1
2
Environmental Performance Specifications
Green Requirement
Storage temp. range
Humidity
Hermetic seal
Solderability
Reflow
Vibration
Shock
Pad Connections
Tri-State
3 SSC Output
Ground
4 +3.3 V D.C.
RoHS Compliant and Pb (lead) free
-55 to +125°C
85% RH, 85°C, 48 hours
Leak rate 2x10-8 ATM-cm3/sec max.
MIL-STD-202F method 208E
260°C for 10 sec.
MIL-STD-202F method 204, 35G, 50 to 2000 Hz
MIL-STD-202F method 213B, test condition. E, 1000GG ½ sine wave
Page 2 of 5
Apr. 19, 2005
Rev. C
How to Order:
Part number Example
“T”:Tri-State
Group
3HM53-BT-32.768R-C0.5
Frequency Stability Code
“A” ~”F”. See table above
Spread Types and %
Down Spread
D1
-1%
D3
-3%
Center Spread
C0.5
±0.5%
C1.5
±1.5%
Frequency (MHz)
Other Packages Available:
HM57: 5x7x1.8 mm 4 pad ceramic SMDs
HM14: Full size 4 pin DIPs
HM8: Half size 4 pin DIPs
HM42: 9.6x11.4x2.5 mm FR4 base leadless SMDs
HM44: 9.6x11.4x4.7 mm FR4 base leadless SMDs
Please visit www.mercury-crystal.com
Instantaneous Frequencies (Example of 100 MHz)
If over-clocking is a problem to your system please choose down spread
Total Spread
%
1%
3%
Down Spread
Instantaneous Frequency
min.
max.
Down Range
Up Range
- 1%
0%
-10,000 ppm
0 ppm
99.000000
100.000000
- 3.0%
0%
-30,000 ppm
0 ppm
97.000000
100.000000
Page 3 of 5
Center Spread
Instantaneous Frequency
min.
max.
Down Range
Up Range
-0.5 %
+0.5%
-5000 ppm
+5000 ppm
99.500000
100.500000
-1.5 %
+1.5%
-15,000 ppm
+15,000 ppm
98.500000
101.500000
Apr. 19, 2005
Rev. C
3HM53-32.768 at No Modulation and at Center Spread 1.5%: 13.1 dBc EMI reduction
-9.9 dB
-23.0 dB
No Modulation
C1.5
EMI Reduction of 3HM53 100 MHz at C0.5 and C1.5 (main mode only)
Modulation Carrier Frequency = 34.687 KHz
TS305B Spectrumanalyzer [email protected]=OFF
TS305B Spectrumanalyzer [email protected]=+/-0.25%
C0.25 (center spread ±0.25%)
No modulation
0
0
-3.33dBm
-3.33dBm
-10
-20
-20
-30
-30
-40
-40
[dBm]
[dBm]
-10
-50
-60
-60
-70
-80
-80
-90
-90
-100
-100
97
98
99
100
101
102
103
-11.19dBm
-50
-70
96
-11.19dBm
104
96
97
98
99
Frequency[MHz]
TS305B Spectrumanalyzer [email protected]=+/-0.5%
0
0
-10
-12.98dBm
-12.98dBm
-40
[dBm]
[dBm]
-30
-40
-50
-60
-70
-80
-90
-90
-100
-100
100
101
102
103
104
-18.54dBm
-18.54dBm
-60
-80
99
104
-50
-70
98
103
-20
-30
97
102
C1.5 (center spread ±1.5%)
-10
96
101
TS305B Spectrumanalyzer [email protected]=+/-1.5%
C0.5 (center spread ±0.5%)
-20
100
Frequency[MHz]
103
104
Frequency[MHz]
96
97
98
99
100
101
102
Frequency[MHz]
Page 4 of 5
Apr. 19, 2005
Rev. C
EMI Reduction of 3HM53 100 MHz at C0.5 and C1.5 (the whole spectrum)
TS305BSpectrumAnalyzer [email protected]=OFF
TS305BSpectrumAnalyzer [email protected]=+/-0.25%
No Modulation
0
-10
-3.21
0
-10.04
-20
-20.15
-24.25
-30
-10
-25.40
-35.04
-40
-30
-50
-40
-60
-70
-11.21
-20.19
-20
[dBm]
[dBm]
C0.25 (center spread ±0.25%)
-33.37
-37.72
-38.87
-48.97
-50
-60
-80
-70
-90
-80
-100
-90
-100
0 100 200 300 400 500 600 700 800 900 1000 1100 1200
0 100 200 300 400 500 600 700 800 900 1000 1100 1200
Frequency[MHz]
Frequency[MHz]
TS305BSpectrumAnalyzer [email protected]=+/-0.5%
TS305BSpectrumAnalyzer [email protected]=+/-1.5%
C0.5 (center spread ±0.5%)
C1.5 (center spread ±1.5%)
0
-20
[dBm]
-30
-40
-10
-12.80
-20
-24.45
-36.75
-30
-41.23
-50
-42.47
-51.40
-60
[dBm]
-10
0
-40
-29.09
-41.22
-50
-46.35
-48.47
-58.77
-60
-70
-70
-80
-80
-90
-90
-100
-19.46
-100
0 100 200 300 400 500 600 700 800 900 1000 1100 1200
0 100 200 300 400 500 600 700 800 900 1000 1100 1200
Frequency[MHz]
Frequency[MHz]
For more technical information please visit www.mercury-crystal.com and download our
technical note TN-020 (Title: “Low EMI Spread Spectrum Clock Oscillators”).
Page 5 of 5
Apr. 19, 2005
Rev. C