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Fujitsu Develops Spread-Spectrum Clock Generator
--Features World's Lowest EMI and Power Consumption Levels --
 Tokyo: April 21, 2003 -- Fujitsu Limited today announced that, in cooperation with Fujitsu VLSI Limited, it has developed a new spread-spectrum clock generator (SSCG) system chip that achieves the world's lowest power requirement and electromagnetic interference (EMI) levels. The new design is being released as the MB88150 Series, with four models available in sample quantities starting today.
The new series uses digital control to generate the oscillator clock's modulation wave. By more accurately controlling clock frequency modulation, the new design enables a record 19 dB (1/80 power ratio) reduction in EMI noise. Moreover, adoption of CMOS process makes possible power consumption of just 18.2 mW (milliwatts)(*1), the lowest in the world.
This new low-noise design eliminates the need for the additional EMI noise-reduction components used in conventional clock generators. Reduced parts-count will help make possible lower costs and smaller sizes for photocopiers, printers, etc.
Pricing and availability
| Product | sample price | sample ship date |
| MB88151 (frequency multiplier built in) | ¥300 | April 21, 2003 |
| MB88152 (with pin for input frequency precision) | ¥300 | Late May, 2003 |
| MB88153 (with power-down pin/external clock input) | ¥300 | Late June, 2003 |
| MB88154 (with reference-clock output) | ¥300 | April 21, 2003 |
Sales targets: 4 million units/month (entire series)
Special Features
- Significant reduction in electromagnetic interference
Digital PLL circuit technology permits extremely precise frequency modulation and reduces EMI by 19 dB (1/80 power ratio), the world's best noise reduction performance. This is about four times better than existing designs, and about twice as good in relation to voltage.
- Low power requirements
A CMOS fabrication process results in a power draw of only 18.2 mW, one-fifth to one-half that of earlier designs.
- Low cycle-to-cycle jitter
The new design has cycle-to-cycle jitter of less than 100 ps (picosecond) at 1x frequency multiplier, compared to 200-300 ps for earlier designs, making it suitable for use with high-speed ASICs and other advanced chips.
Main specifications of MB88150 Series
| MB88151 | MB88152 | MB88153 | MB88154 |
| Power supply | 3.3±0.3 V |
| Operating temp | -20 to +85°C |
| Current (typ @24 MHz, no load) | 5.0 mA | 5.0 mA | 4.5 mA | 5.5 mA |
| Input freq (MHz) | 16.6 to 33.4 | 20 to 134 | 20 to 134 | 20 to 67 |
| Output freq (MHz) | 8.3 to 33.4 | 20 to 134 | 20 to 134 | 20 to 67 |
| Liquid-crystal oscillator (MHz) | 16.6 to 33.4 | 20 to 40 | - | 20 to 40 |
| Modulation (%) | ±0.5, ±1.5; or -1.0, -3.0 selectable | ±0.5, ±1.0, ±1.5; or -1.0, -2.0, -3.0 selectable |
| Modulation clock output amplitude | 40-60% |
| Cycle-to-cycle jitter | <100ps(@1x freq mult) | <100ps |
| Frequency multipliers (times) | 1/2, 1, 2, 4 | - | - | - |
| Packaging | Plastic 8-pin SSOP |
- (*1)18.2 mW:
- Assuming a 3.3V power source, 24 MHz main frequency after spread, and no load
Trademark notice
All product names and company names mentioned herein are the trademarks or registered trademarks of their respective firms.
About Fujitsu
Fujitsu is a leading provider of customer-focused IT and communications solutions for the global marketplace. Pace-setting technologies, high-reliability/performance computing and telecommunications platforms, and a worldwide corps of systems and services experts make Fujitsu uniquely positioned to unleash the infinite possibilities of the broadband Internet to help its customers succeed. Headquartered in Tokyo, Fujitsu Limited (TSE:6702) reported consolidated revenues of 5 trillion yen (about US$38 billion) for the fiscal year ended March 31, 2002. For more information, please see: http://www.fujitsu.com/
[Press Contacts]
Koyo Nishi, Nancy Ikehara
Fujitsu Limited, Public & Investor Relations
Tel: +81-3-3215-5259 (Tokyo)
Fax: +81-3-3216-9365
 Press Inquiries
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[Customer Contact]
Fujitsu Limited
Electronic Devices Group
System Micro Division
Tel: +81-42-532-1397
e-mail:edevice@fujitsu.com
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All company/product names mentioned may be trademarks or registered trademarks of their respective holders and are used for identification purpose only.
Please understand that product prices, specifications and other details are current on the day of issue of the press release, however, may change thereafter without notice.
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