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News Article

Adds 3.125Gb/s Low Cost Laser Drivers, Limiting Amps, and TIAs

Source: Vitesse

Adds 3.125Gb/s Low Cost Laser Drivers, Limiting Amps, and TIAs

Camarillo, CA. Vitesse Semiconductor Corporation (NASDAQ:VTSS) today announced the expansion of its optoelectronic product offering with the addition of ten new products targeted at next generation OC-48 SONET/SDH DWDM systems up to 3.125Gb/s, Gigabit Ethernet, and Fibre Channel equipment manufacturers. These laser drivers, limiting amplifiers and transimpedance amplifiers (TIAs) combined with Vitesse s other opto products, provides manufacturers with the largest product offering from a single vendor in the industry. The new products are specifically targeted at transceiver and transponder applications. They provide the module designer a high degree of flexibility with a multitude of transimpedance amplifiers, limiting amplifiers, and laser drivers to optimize sensitivity with minimum chip count and power dissipation. Typical prices for all of these new devices is $10-$12 each in quantities of 10,000.

"The designers of new communications equipment need to optimize a fiber s capability by having a longer module reach, excess margin on the data eye opening, and a low dispersion penalty. These new devices provide this and more in low cost packages (or die form), that are guaranteed to run at today s higher required temperatures," stated Ray Milano, vice president and general manager of optoelectronic products at Vitesse. "Thorough testing at the maximum operating temperature insures that users will be able to maximize the yield of their module and board assemblies," continued Milano. "These products are also designed to work seamlessly with Vitesse s wide array of physical layer devices, thereby reducing design time and chip count requirements and maximizing performance," concluded Milano.

VSC7938, VSC7939, VSC7940 -- 3.125Gb/s Laser Drivers with Automatic Power Control

The VSC7938/39/40 are a family of SONET/SDH 3.125Gb/s laser diode drivers with internally filtered Automatic Power Control which provides the ability to maintain a constant average optical power and reduces part count and board space requirements because an external capacitor is not required. The VSC7938 and VSC7939 are designed to operate using a single 3.3V or 5V supply. The VSC7940 operates from a 5V supply and in addition to the features of the VSC7939 has a maximum modulation current of 100mA. The data and clock inputs of all three drivers support PECL and other inputs that meet the common mode voltage and differential voltage swing specifications.

The differential pair output stage of the VSC7938 and VSC7939 are capable of driving up to 60mA into the laser with typical rise and fall times of 60ps. This output may be DC-coupled for 5V operation. To allow for larger output swings during 3.3V operation, the VSC7938 and VSC7939 can be AC-coupled to the laser cathode with a pull-up inductor for DC-biasing. This configuration isolates laser forward voltage from the output circuitry and allows the output to swing above and below the supply voltage. The VSC7938 also provides a slow-start mechanism to set a laser turn-on delay. The VSC7938 is packaged in a 48-pin TQFP. The VSC7939 and VSC7940 are available in a 32-pin TQFP package and provide pins for monitoring modulation and bias currents. Production quantities of all three devices will be available in April, 2001.

VSC7959 and VSC7961 - 3.125Gb/s Limiting Amplifiers with Loss of Signal (LOS) Detect

The VSC7959 and VSC7961 are single supply (5V or 3.3V) limiting amplifiers with Loss-of-Signal (LOS) detect for SONET/SDH and Fibre Channel applications up to 3.125Gb/s. The low power dissipation makes it possible to utilize four VSC7959 or VSC7961 s to implement Coarse Wavelength Division Multiplexing (CWDM) or quad modules for the developing 10Gb/s Ethernet market. The devices provide constant output signal swing for a wide range of input voltages. The VSC7959 has current-mode logic (CML) outputs. For design flexibility, the VSC7961 provides the same functionality as the VSC7959 with positive emitter-coupled logic (PECL) outputs. The maximum output random jitter of both devices is less than 8ps RMS at the sensitivity limit. The programmable Loss of Signal (LOS) uses a RMS power detector to sense the input signal and provide a TTL output to indicate no input. Both devices are available with optional output squelch, adjustable output levels and provide excellent jitter performance. Each device s fast rise and fall times result in the best dispersion penalty for short and intermediate, as well as long reach fiber communications. The VSC7959 and VSC7961 are available in die form or in a 16-pin TSSOP package, with samples offered in March 2001 and production quantities available in April 2001.

VSC7969 - 3.125Gb/s Transimpedance Amplifier and Limiting Amplifier

The VSC7969 is a 3.125Gb/s transimpedance amplifier with an integrated limiting amplifier, a signal detect feature and a photocurrent monitor reducing a designer s power and board space requirements. The VSC7969 does not require any external electrical components and is ideal for the design of high performance optical receivers for SONET/SDH applications. The overall effective differential transimpedance of the VSC7969 is typically 27kW and the minimum output single ended voltage is 200mVp-p. The VSC7969 operates on a single 3.3V or 5.0V power supply with a maximum power dissipation of 300mW. The low power consumption of the VSC7969 makes it suitable for small form factor (SFF) applications. DC biasing is provided for a PIN photodiode. APD detectors can be connected and separately biased to provide optimal performance. For additional flexibility, the VSC7969 is offered in die form, TSSOP-16, or a TO-46 package which includes a PIN detector. Samples are available now with production quantities available in March 2001.

VSC7960 and VSCC7962 - Limiting Amplifier and Laser Driver

The VSC7960 and VSC7962 ICs contain both a limiting amplifier and laser diode driver for SDH/SONET applications up to 3.125Gb/s. These devices require a single 3.3V supply. The limiting amplifier of each device is similar to the VSC7959/61 and features LOS detect, output offset correction, and optional output squelch. The laser driver data inputs of both the VSC7960 and VSC7962 accept differential PECL signals with the output modulation and bias currents easily controlled via external components. The laser diode driver Automatic Power Control (APC) loop maintains a constant average optical power over temperature and lifetime. The dominant pole of the APC loop can be controlled with an external capacitor. Other features of these devices include enable control, short-circuit protection for the modulation and bias inputs, short rise and fall times, and failure-monitor output to indicate when the APC loop is unable to maintain the average optical power. The VSC7960 and VSC7962 are available in die form or in a 48-pin TQFP package with samples offered in March 2001 and production quantities available in April 2001.

VSC7807 - 2.125Gb/s Photodiode/Transimpedance Amplifier (MSM-TIA)

The VSC7807 2.125Gb/s photodiode/transimpedance amplifier is ideal for small form factor (SFF) optoelectronic transceivers used in Gigabit Ethernet and double speed Fibre Channel applications. Optical detection is accomplished using an MSM photodetector having optimal sensitivity in the 700nm-860nm spectral range. The receiver sensitivity, duty cycle distortion and jitter specifications of the VSC7807 meet or exceed all Fibre Channel and Gigabit Ethernet requirements. The VSC7807 operates on a single 3.3V power supply. For flexibility, the VSC7807 is available in a TO-46 or TO-56 header assembly with flat window or ball lens. Production quantities are available now.

VSC7709 - 1.25Gb/s Photodiode/Transimpedance Amplifier (PIN-TIA)

The VSC7709 complements Vitesse s existing line of 1.25Gb/s TIAs for SFF transceivers, optoelectronic module and receiver, as well as Gigabit Ethernet and Fibre Channel receivers. This PIN Photodetector/TIA provides a highly integrated solution for converting 850nm-1300nm light into a differential output voltage. This device operates at 3.3V and provides detector bias, eliminating the need for a separate bias connection. As with Vitesse s other TIAs, the VSC7709 s sensitivity, duty cycle distortion and jitter specification meet or exceed all Fibre Channel and Gigabit Ethernet application s requirements. The VSC7709 is available in die form or in TO-46, or TO-56 assemblies, which also include a PIN photodiode. Production quantities are available now.

Vitesse Semiconductor Corporation is the leading designer and supplier of innovative, high performance semiconductors utilizing state-of-the-art processes for the communications equipment manufacturers of next generation DWDM and optical networking, as well as storage area networking ICs and enclosure management products that monitor and communicate critical reliability and availability information. The company s products address the needs of Core, Access, Optical and Enterprise network equipment manufacturers who demand a combination of high speed, high complexity and low power dissipation. Vitesse is headquartered in Camarillo, California, and manufactures volume ICs at its two fabrication facilities in Camarillo and Colorado Springs. Company/product information can be found on the web at www.vitesse.com.

Contacts:

Patricia Ito Vitesse Semiconductor (805) 388-3700 ito@vitesse.com

Caroline Melnicoff CMC Public Relations (650)324-8819 cmp1@earthlink.net

 

Patricia Ito
Vitesse Semiconductor
(805) 388-3700
ito@vitesse.com
Caroline Melnicoff
CMC Public Relations
(650)324-8819
cmp1@earthlink.net
 
E-mail: cmp1@earthlink.net
Web site: http://www.vitesse.com
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