Low EMI Spread Spectrum Clock Oscillators

Low EMI Spread Spectrum Clock Oscillators
“HM” series
Logic: TTL / HCMOS; Square Wave
MERCURY
Since 1973
EMI problem?
No problem. Mercury “HM” series EMI suppressed clock oscillators
is your efficient and low cost solution for the expensive EMI problem.
The name of the game is: Reduce the EMI sources at its principal sources – the clock signals.
Drop -in replacements for full size, half size 4 pin DIPs, 5x7 mm ceramic SMDs and others
Built -in loop filter and matched impedance layout. No external components required.
Product Description
FCC (U.S.), EMC Directive (Europe) and EN require electronic devices to comply with appropriate radiation
emission standards. Traditional EMI (Electro Magnetic Interferences) lowering techniques include shielding,
filtering, de-coupling, ground planes and ferrite beads were common practice in old days. But with the trend of
lower operating voltage, higher carrier frequency, narrower band width and tighter regulations, these techniques
become less effective and costly.
Timing signals in a system normally synchronize to a reference clock. Therefore, from efficiency
prospective, an EMI suppressed reference signal at the beginning of the clock stage would make most of those
traditional EMI suppression measures unnecessary. This leads to the industrial applications of the Spread
Spectrum Technology (SST). SST technology was first used in World War II for jamming and anti-jamming
tactics.
By modulating the peak energy over a wide frequency bandwidth with a low frequency carrier, the
amplitude of the fundamental and its associated harmonics can be reduced by several dB. The resultant averaged
energy from reduced peak energy helps to comply the EMI regulations (total energy is not changed). Using the
SST clocks has no impact on the system performance (for example CPU clock rate) because the modulation rate
is slow relative to the clock rate (KHz vs MHz) and it is transparent to the system.
Applications
Printers; (MFPs) Multiple function printers
Networking; LAN / WAN; Routers
Scanner; Modems; projectors
Automotive; GPS car navigation systems
ADSL; PCMCIA
Digital copiers; PDAs
Storage systems (CD-ROM, VCD, DVD and HDD)
Embedded systems; Electrical musical instrument
LCD PC monitors / LCD TVs
Digital cameras with resolution of 3M pixels or higher
Options for HM14 and HM24
Group T only
(HM14 and HM24 only)
MERCURY
Pin 1 or Pad 1
Option “P”: POWER DOWN when low.
Option “T”: TRI-STATE when low
Option “S” SPREAD OFF when low
Page 1 of 9
Pin 14 (output pin)
Option “H”: HIGH DRIVE output is
±24 mA typical
Date: Sept. 15, 2003
Rev. 1
Low EMI Spread Spectrum Clock Oscillators
“HM” series
Logic: TTL / HCMOS; Square Wave
“HM” Series General Specifications
MERCURY
Since 1973
TA=+25°C, VDD at specified voltage, CL=15 pF
Please refer to “Available Spread Types and Percentages” tables
below for other electrical parameters
Frequency Stability over operating
temperature
±25 ppm over 0°C to +70°C (Stability code is “A”)
±50 ppm over 0°C to +70°C (Stability code is “B”)
±100 ppm over 0°C to +70°C (Stability code is “C”)
Commercial (Temperature code is " C "): 0°C to +70°C
If non-standard please enter the desired stability after the “C”.
For example “C20” represents ±20 ppm over 0°C to +70°C
-65°C to +150°C
±5 ppm per year max.
Operating Temperature Range
Storage Temperature
Aging
(1)
Inclusive of 25°C tolerance, operating temperature range, ±10% input voltage variation, load change, aging, shock and vibration.
Note 1: The higher modulation rate, the higher EMI reduction. However, please make sure the operating
Frequency(fo) and jitter do not exceed the system’s allowable tolerance. Choose down spread if your system does not tolerate
over-clocking (fc >fo).
Note 2: Example of a 10 MHz spread spectrum oscillator: The reference frequency range for
C1 (center spread ±1%) is swept between 9.900 MHz and 10.100 MHz
D1 (down spread -1%) is swept between 9.900 MHz and 10.000 MHz
DC1 (down spread –1 % and center spread +0.5%) is swept between 9.900 MHz and 10.050 MHz
Part Number Format and Examples:
Package code
Supply
Voltage
Frequency
stability
Code
HM___
“3” for +3.3V
“5” for +5.0 V
Pin 1 option. HM14 and HM24 only.
“P” for POWER DOWN; “S” for SPREAD OFF
“T” for TRI-STATE; “ “ (blank) for no option
“H” for HIGH DRIVE
Blank or
Option or
options
Choose from A,B or C
Nominal
frequency
Group R,P,W,Y or
T
(see tables below)
See tables below
Suffix for
modulation type and
percentage
Frequency in MHz
3HM8-B-16.384T-C0.625 represents +3.3 V input voltage, half size 4 pin DIP package, ±50 ppm over 0 to
+70°C frequency stability, spread spectrum 16.384 MHz clock oscillator with
±0.625% (total 1.25%) cetner spread. Group A charteristics.
5HM44-C-40.000P-D1.5
represents +5.0 V input voltage, HM44 package, ±100 ppm over 0 to +70°C,
frequency stability, spread spectrum 40.000 MHz clock oscillator with –1.5% down
spread. Group P characteristics.
3HM14A-H-125.0T-DC1.5 represents +3.3 V input voltage, HM14 package, ±25 ppm over 0 to +70°C,
frequency stability, spread spectrum 125.0 MHz clock oscillator with down center
–1.5% +0.25% spread. Output is +/-24 mA high drive. Group T characteristics.
MERCURY
Page 2 of 9
Date: Sept. 15, 2003
Rev. 1
Low EMI Spread Spectrum Clock Oscillators
“HM” series
Logic: TTL / HCMOS; Square Wave
Modulation Types
MERCURY
Since 1973
Output amplitude (dB) vs frequency span (MHz)
Center spread “C”. “C0.5” as an example
dB
F
Regular Clock
EMI reduction
Spread spectrum clock
fo + (fo*0.5%)
T
fo
fo - (fo*0.5%)
Modulation Carrier frequency in KHz
Freq
fo - (fo*0.5%) fo=fc
fo + (fo*0.5%)
Down spread “D”. “D1 as an example”
F
Regular Clock
dB
fo
EMI reduction
Spread spectrum clock
T
fo - (fo*1%)
Modulation Carrier frequency in KHz
Freq
fo - (fo*1%)
fc
fo
Down Center spread “DC” also known as “asymmetric spread”. “DC1.25 as an example”
Regular Clock
dB
F
EMI reduction
Spread spectrum clock
fo + (fo*0.25%)
fo
T
fo - (fo*1.25%)
Freq
fo - (fo*1.25%)
fc fo
MERCURY
fo + (fo*0.25%)
Page 3 of 9
Modulation Carrier frequency in KHz
Date: Sept. 15, 2003
Rev. 1
Low EMI Spread Spectrum Clock Oscillators
“HM” series
Logic: TTL / HCMOS; Square Wave
MERCURY
Since 1973
Available Spread Types and Percentages:
Group R
Modulation carrier frequency: 33 KHz
EMI reduction: -7 dB min.
-11 dB (48 MHz at down spread 3% , span of spectrum analyzer is 14 MHz);
-12 dB (48 MHz at center spread 1.5% , span of spectrum analyzer is 14 MHz)
-12 dB (72 MHz at center spread 1.5% , span of spectrum analyzer is 8 MHz)
Duty cycle: 50±10% (measured at 50% VDD)
Logic “0”: 0.8 V max (measured at 20% VDD); Logic “1”: 2.0 V min. (measured at 80% VDD)
Rise Time: 2 ns typical (measured at 0.4 V 2.4 V); fall time: 1.5 ns typical (measured at 2.4 V 0.4 V)
Current consumption: 10 mA typical at 24 MHz, 25 mA typical at 72 MHz, (all at 15 pF load, +3.3V, +25°C)
Cycle to cycle jitter: ±250 ps typical; ±300 ps max.
Output impedance: 40 ohms typical
Start-up time: 5 ms max.
Frequency Range
Package Type
Supply Voltage
Spread Type
Spread Percentage
(MHz)
±0.25
Available packages:
10 ~ 160
Center
±0.5
HM57
±1.5
HM42; HM44
+3.3 V±5% only
-0.5
HM14; HM24
10 ~40
Down
-1.0
HM8; HM18
-3.0
Part Number suffix
C0.25
C0.5
C1.5
D0.5
D1
D3
Group P
Modulation carrier frequency: 19.5 KHz ~ 58.5 KHz. Contact Mercury for your exact modulation frequency.
EMI reduction: -9.2 dB (50 MHz at down spread 2% , span of spectrum analyzer is 10 MHz);
-14 dB (150 MHz 3rd harmonic of above example);
Duty cycle: 50±10% (measured at 50% VDD)
Logic “0”: 0.4 V max (measured at 20% VDD); Logic “1”: 2.4 V min. (measured at 80% VDD)
Rise Time: 1.5 ns typical (measured at 0.8 V 2.0 V); fall time: 1.2 ns typical (measured at 2.0 V 0.8 V)
Current consumption: 25 mA typical at 48 MHz, (at 15 pF load, +3.3V, +25°C)
Cycle to cycle jitter: ±100 ps max.
Please contact Mercury if you don’t
Output impedance: 40 ohms typical
find what you need in these tables
Start-up time: 5 ms max.
Frequency Range
Package Type
Supply Voltage
Spread Type
Spread Percentage Part Number suffix
(MHz)
±0.25
C0.25
±0.5
C0.5
±0.75
C0.75
Center spread
±1
C1
±1.25
C125
Available packages:
±1.5
C1.5
HM57
HM42; HM44
+3.3 V ±5% only
10 ~ 180
±1.75
C1.75
HM14; HM24
Down spread
-1
D1
HM8; HM18
-1.25%; +0.25%
DC1.25
-1.5%; +0.5%
DC1.5
Down –center
-1.75%; +0.75%
DC1.75
spread
-2%; +1 %
DC2
-2.25%;+1.25%
DC2.25
MERCURY
Page 4 of 9
Date: Sept. 15, 2003
Rev. 1
Low EMI Spread Spectrum CLOCK OSCILLATORS
“HM” series
Logic: TTL / HCMOS; Square Wave
MERCURY
Since 1973
Group W
Modulation carrier frequency: 31.4 KHz ~ 33.3 KHz. Contact Mercury for your exact modulation frequency.
EMI reduction: -8 dB min. (20 MHz 3rd harmonic, center spread 0.625% (total amount 1.25%) , span of spectrum analyzer is 10 MHz);
-12.7 dB min. (20 MHz 3r harmonic, center spread 1.875% (total amount 3.75%), span of spectrum analyzer is 10 MHz);
Duty cycle: 50±10% (measured at 50% VDD)
Logic “0”: 0.4 V max (measured at 20% VDD); Logic “1”: 2.4 V min. (measured at 80% VDD)
Rise Time: 5 ns max. (measured at 0.8 V 2.4 V); fall time: 5 ns max. (measured at 2.4 V 0.8 V)
Current consumption: 25 mA typical at 48 MHz, (at 15 pF load, +3.3V, +25°C)
Cycle to cycle jitter: ±250 ps typical; ±300 ps max.
Please contact Mercury if you don’t
Output impedance: 25 ohms typical
find what you need in these tables
Start-up time: 5 ms max.
Frequency Range
Package Type
Supply Voltage
Spread Type
Spread Percentage Part Number suffix
(MHz)
±0.625 %
C0.625
Center spread
Available packages:
+3.3 V ±5% or
±1.875 %
C1.875
HM44
8 ~ 28 MHz
+5.0 V ±10%
- 1.25 %
D1.25
HM14; HM24
Down spread
- 3.75 %
D3.75
Group Y
Modulation carrier frequency: 31.25 KHz ~ 62.5 KHz. Contact Mercury for your exact modulation frequency.
EMI reduction: -8 dB ~ -16 dB
Duty cycle: 50±10% (measured at 50% VDD)
Logic “0”: 0.4 V max (measured at 20% VDD); Logic “1”: 2.4 V min. (measured at 80% VDD)
Rise Time: 4 ns max. (measured at 0.8 V 2.4 V); fall time: 4 ns max. (measured at 2.4 V 0.8 V)
Current consumption: 18 mA typical at 6 MHz, 24 mA typical at 24 MHz (at 15 pF load, +3.3V, +25°C)
Cycle to cycle jitter: ±550 ps typical at 4 MHz;±200 ps typical at 8 MHz; ±180 ps typical at 32 MHz; ±100 ps typical at 128 MHz
Output impedance: 25 ohms typical
Start-up time: 5 ms max.
Frequency Range
Package Type
Supply Voltage
Spread Type
Spread Percentage Part Number suffix
(MHz)
±0.5 %
C0.5
±0.6 %
C0.6
Center spread
±1.2 %
C1.2
±1.4 %
C1.4
4 ~ 5 MHz
- 0.7 %
D0.7
- 1.9 %
D1.9
Down spread
- 2.2 %
D2.2
-3%
D3
±0.4 %
C0.4
Available packages:
±0.5 %
C0.5
HM44
+3.3 V ±5% only
Center spread
±1.1 %
C1.1
HM14; HM24
±1.3 %
C1.3
5.01 ~ 6 MHz
- 0.6 %
D0.6
- 1.7 %
D1.7
Down spread
- 1.9 %
D1.9
- 2.7 %
D2.7
±0.4 %
C0.4
±0.5 %
C0.5
6.01 ~ 7 MHz
Center spread
±0.9 %
C0.9
±1.2 %
C1.2
MERCURY
Page 5 of 9
Date: Sept. 15, 2003
Rev. 1
Low EMI Spread Spectrum Clock Oscillators
“HM” series
Logic: TTL / HCMOS; Square Wave
Down spread
Center spread
7.01 ~ 8 MHz
Down spread
Center spread
8.01 ~ 10.0 MHz
Down spread
- 0.6 %
- 1.5 %
- 1.8 %
- 2.5 %
±0.3 %
±0.4 %
±0.9 %
±1.1 %
- 0.5 %
- 1.4 %
- 1.7 %
- 2.3 %
±0.5 %
±0.6 %
±1.2 %
±1.4 %
- 0.7 %
- 1.9 %
- 2.2 %
-3%
MERCURY
Since 1973
D0.6
D1.5
D1.8
D2.5
C0.3
C0.4
C0.9
C1.1
D0.5
D1.4
D1.7
D2.3
C0.5
C0.6
C1.2
C1.4
D0.7
D1.9
D2.2
D3
Group T
Modulation carrier frequency: 27.7 KHz ~ 52.0 KHz. Contact Mercury for your exact modulation frequency.
EMI reduction: -8 dB ~ -16 dB
Duty cycle: 50±10% (measured at 50% VDD)
Logic “0”: 0.4 V max (measured at 20% VDD); Logic “1”: 2.4 V min. (measured at 80% VDD)
Rise Time: 2 ns max. (measured at 0.8 V 2.0 V); fall time: 2 ns max. (measured at 2.0 V 0.8 V)
Current consumption: 28 mA typical at 48 MHz, (at 15 pF load, +3.3V, +25°C)
Cycle to cycle jitter: ±160 ps typical
Please contact Mercury if you don’t
Output impedance: 25 ohms typical
find what you need in these tables
Start-up time: 5 ms max.
Frequency Range
Package Type
Supply Voltage
Spread Type
Spread Percentage Part Number suffix
(MHz)
Available packages:
10 to 20 MHz
Down center
-2%; +0.5%
DC2
HM14, HM24
Center
±0.75%
C0.75
10 to 30 MHz
Down center
-1.5%; +0.25%
DC1.5
10 to 40 MHz
Down center
-2.25%; +0.25%
DC2.25
(+3.3V only)
20 to 30 MHz
Down
-0.5%
D0.5
20 to 40 MHz
Down center
-2%; +0.5%
DC2
(+3.3V only)
Center
±0.75%
C0.75
+ 3.3 V±5% or
20 to 50 MHz
+5.0 V ±10%
Center
±1%
C1
Down center
-1.5%; +0.25%
DC1.5
Center
±0.75%
C0.75
20 to 60 MHz
Down center
-1.25%; +0.25%
DC1.25
Down center
-1.5%; +0.25%
DC1.5
20 to 80 MHz
Down center
-3%; +0.5%
DC3
30 to 40 MHz
Down
-1.5%
D1.5
30 to 60 MHz
Down
-2.5%
D2.5
30 to 80 MHz
Down center
-1.25%; +0.25%
DC1.25
MERCURY
Page 6 of 9
Date: Sept. 15, 2003
Rev. 1
Low EMI Spread Spectrum Clock Oscillators
“HM” series
Logic: TTL / HCMOS; Square Wave
30 to 100MHz
30 to 150MHz
40 to 60 MHz
Center
Center
Down center
Center
Center
Center
Center
Down center
Down center
Center
Center
Down center
Down center
Center
Down center
Center
Down center
Center
Down center
Down center
Center
Down
Center
Center
Down
Down
Down center
Down center
Down center
Center
Down center
Down center
Center
Down center
Center
Down center
Down center
40 to 80 MHz
40 to 100MHz
40 to 120MHz
40 to 140MHz
48 to 138MHz
50 to 100MHz
60 to 80 MHz
60 to 90 MHz
60 to 100MHz
60 to 120MHz
60 to 140MHz
64 to 128MHz
80 to 120MHz
80 to 136MHz
80 to 150MHz
Output Waveform:
Tr
VOH
VOL
TH
T
MERCURY
Page 7 of 9
Tf
±0.5%
±1%
-1.5%; +0.5%
±0.5%
±0.75%
±1%
±1.25%
-1.25%; +0.25%
-1.5%; +0.5%
±0.75%
±1%
-1.5%; +0.25%
-1.5%; +0.5%
±0.5%
-1%; +0.5%
±1.25%
-2%; +0.5%
±0.75%
-1.25%; +0.25%
-1%; +0.5%
±0.5%
-1%
±0.75%
±1%
-1%
-1.5%
-0.75%; +0.25%
-1.5%; +0.25%
-1.5%; +0.5%
±0.5%
-1.5%; +0.5%
-1.5%; +0.5%
±1%
-1%; +0.5%
±0.75%
-1.25%; +0.25%
-1.5%; +0.25%
TTL
CMOS
2.4V
80%VDD
1.4V
50%VDD
0.4V
20%VDD
MERCURY
Since 1973
C0.5
C1
DC1.5
C0.5
C0.75
C1
C1.25
DC1.25
DC1.5
C0.75
C1
DC1.5
DC1.5
C0.5
DC1
C1.25
DC2
C0.75
DC1.25
DC1
C0.5
D1
C0.75
C1
D1
D1.5
DC0.75
DC1.5
DC1.5
C0.5
DC1.5
DC1.5
C1
DC1
C0.75
DC1.25
DC1.5
Duty Cycle = (TH / T)x100%
Date: Sept. 15, 2003
Rev. 1