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World's First* SAW Oscillator to Exhibit a Cubic-Curve Frequency/Temperature Coefficient The EG-4101 and 4121CA high-stability SAW oscillators * According to Epson Toyocom research.

EG-4101/4121CA　イメージ EG-4101/4121CA *Supports high-frequency fundamental modes (from 100 MHz to 700 MHz) *Provides cubic-curve frequency/temperature coefficient equal to or better than that of an *AT oscillator *Low jitter and low phase noise contribute to transmission reliability

Point! These oscillators combine the low jitter and low phase noise of a SAW device at high frequencies with the good frequency/temperature coefficient of an AT device, for the best of both worlds.

Communications clock requirements

Higher frequency crystal devices, used as clock sources in communications equipment, are needed to support the accelerating size and speed of data transmissions.
There are three possible solutions for providing frequencies in the 100 MHz to 700 MHz range: SAW devices, AT devices with analog multiplication, and PLL type AT devices. Each solution has its strengths and weaknesses, as summarized in the table.

  Conventional SAW oscillator
(fundamental wave)		 AT-crystal oscillator
(with analog multiplication)		 AT crystal oscillator
(PLL type)
Frequency/temperature coefficient △ ○ ○
Phase noise ◎ ◎ △
Jitter ◎ ○ △
Output spurious ◎ △ △
Adaptability to high frequency ◎ △ △
Miniaturization ○ △ ◎

High reliability, with AT-like cubic-curve frequency/temperature coefficient

The cutting angle of the crystal chip used in the EG-4101/4121CA has been optimized, resulting in a frequency/temperature coefficient that is described by a cubic curve and producing a SAW oscillator with AT oscillator level stability.
NOTE: At a temperature range from -40 ℃ to +85 ℃, the EG-4101/4121CA exhibit stability of ±15 × 10-6 (Typ.), whereas an ordinary SAW oscillator exhibits stability of 0 to -140 × 10-6 (Typ.).

frequency/temperature coefficient We succeeded in producing a high-frequency clock source with good all-around characteristics by improving the frequency/temperature coefficient.
  EG-4101/4121A
(fundamental wave)		 AT-crystal oscillator
(with analog multiplication)		 AT crystal oscillator
(PLL type)
Frequency/temperature coefficient ○ ○ ○
Phase noise ◎ ◎ △
Jitter ◎ ○ △
Output spurious ◎ △ △
Adaptability to high frequency ◎ △ △
Miniaturization ○ △ ◎

EG-4101/4121CA frequency/temperature coefficient demo

Watch the movie to see a demo of the world's first SAW device to exhibit a cubic-curve frequency/temperature coefficient.

Get ADOBE FLASH PLAYER

To view or print the movie, you need to install Adobe Flash Player, distributed free by Adobe Systems.

The EG-4101/4121CA are perfect for core networks and wireless base stations that require high-frequency clock sources. These low-jitter, low-phase-noise SAW devices provide reliable communications, while their outstanding frequency/temperature coefficient means they are able to operate stably even under harsh environmental conditions.

EG-4101/4121CA basic specifications

NOTE: The specifications are current as of September 16, 2009.

Item Specification
Output load condition LV-PECL LVDS HCSL
Output frequency range 100 MHz to 700 MHz 100 MHz to 500 MHz
Operating temperature range -40 ℃ to +85 ℃（standard） / -40 ℃ to +90 ℃（option）
Storage temperature range -55 ℃ to +125 ℃
Supply voltage 2.5±0.125 V / 3.3±0.33 V
Current consumption 100 mA Max.
/ 80 mA Max.		 30 mA Max.
/ 45 mA Max.		 80 mA Max.
/ 75 mA Max.
Frequency tolerance ±50 × 10-6
Phase jitter 0.2 ps Max.（@622.08 MHz, 12 kHz to 20 MHz）
External dimensions (mm) 7.0 × 5.0 × 1.2t
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