Norwood, M.A. Analog Devices, Inc. announced its new XFP (10 Gbit small form-factor pluggable) optical transceiver chipset and reference design.
XFP is rapidly becoming the leading standard for optical transceiver modules that connect to 10 Gbits/s (gigabit per second) ports, such as those used in Ethernet, Fibre Channel, and SONET/SDH protocol applications. XFP is protocol agnostic, uses less than one-third the power, and is one-third the size of an MSA (Multisource Agreement) transceiver with parallel interface. It is also "hot pluggable," meaning that the system does not have to be shut down prior to installation. For the fast-growing XFP optical transceiver market, ADI's chipset offers best-in-class jitter performance to ease interoperability challenges caused by using transceiver modules from different manufacturers in the same optical networking system, and the accompanying reference design enables reduced time-to-market.
For optical network engineers who must implement 10 Gbits/s transceiver designs, ADI's XFP chipset achieves optical eye margins of greater than 20% over temperature to SONET specifications, has receive sensitivities of better than -19 dBm, and offers a signal conditioner with jitter performance that exceeds XFP specifications. An accompanying reference kit includes an XFP optical transceiver.
The XFP chipset includes the following Analog Devices' products designed to work together:
- Signal Conditioner: The ADN2928 dual XFP signal conditioner retimes the signal in the module on both the transmit and receive paths. The dual signal conditioner has jitter generation performance of 6 mUI RMS at OC-192, jitter tolerance of 0.6 UI p-p at 10 MHz for OC-192 and jitter transfer bandwidth of 2.0 MHz, all exceeding XFP specifications.
- Transimpedance Amplifier: On the receive path, the ADN2821 is a 3.3 V, 10 Gbits/s TIA (transimpedance amplifier) with 1.1 uA of total integrated noise, allowing receiver sensitivities of -19 dBm to be achieved in a standard TO-46 can package. The device supports PIN diodes, dissipates 150 mW of power and has a receive optical sub-assembly (ROSA) reference design that supports the XMD standard.
- Laser Drivers: Two laser drivers support distributed feedback (DFB), Fabry-Perot (FP) and vertical-cavity side-emitting lasers (VCSELs). The ADN2525 3.3 V, 10 Gbits/s Active Terminated Differential laser diode driver (LDD) supports DFB and FP lasers, achieving optical eye margins of greater than 20% over temperature for SONET and greater than 40% for Ethernet, with typical power consumption for the laser and the LDD of 750 mW. The ADN2530 10 Gbits/s Active Terminated Differential VCSEL driver dissipates 300 mW for the laser and the LDD, and is pin-compatible with the ADN2525.
- The ADuC7020 precision analog microcontroller allows the module's functionality to be programmed in software, and supports control of more complicated and higher performance modules. On a single-chip, the microcontroller integrates a 32-bit RISC core with data conversion technology that supports up to eight channels of 12-bit analog-to-digital conversion and up to four 12-bit digital-to-analog converters.
The XFP optical transceiver reference design is available with the dual signal conditioner, TIA, microcontroller and choice of laser driver, for immediate evaluation of optical transceiver designs. It includes a host board, I2C support, Gerber files, object and source code for the microcontroller, a graphical user interface and technical documentation. The board's layout supports the XMD standard, allowing engineers to easily evaluate their own lasers.
The XFP reference design is available now. The dual signal conditioner, TIA, microcontroller and choice of LDD chipset are priced at $50 in high volumes. Click here for the XFP chipset data sheet.
Analog Devices, Inc.