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CDR ICs accommodate changing bit rate requirements


ADI's ADN2813 Functional Block Diagram

Norwood, Mass. — Today Analog Devices Inc. unveiled continuous-tuning clock and data recovery (CDR) ICs that can recover any incoming data pattern without external control or the use of a reference clock.

This feature, which is unlike other CDR solutions that are designed for specific data rates or that require external control to identify frequencies, allows equipment developed today to accommodate changing bit rate requirements in the future. For optical engineers, this means they can develop a single design that can be standardized for use in multiple systems, according to ADI.

Optical networking systems can benefit from these CDR ICs, which boast a wide jitter performance margin beyond synchronous optical network (Sonet) specifications and low power dissipation.

The ADN2813, ADN2814, ADN2815 and ADN2816 family of CDRs are intended for use in fixed-rate, multi-rate and continuous-tuning data communications and telecom applications.

Offered in a variety of price and power points to suit the entire range of networking applications at 1.25 gigabits per second (Gbits/s) and below, the new devices are pin-compatible with ADI's
ADN2812, a fully automatic continuous-tuning CDR.

These CDRs provide jitter performance that beat Sonet specifications by more than a factor
of three in all categories (jitter generation, jitter tolerance, jitter transfer), ADI said. Their I²C interface provides access to exclusive features such as data rate readback, which identifies the data rate of the incoming signal. The CDRs operate from a single 3.3-V supply.

The ADN2813 (12.3 mega bits per second to 1.25 Gbits/s) and the ADN2814 (12.3 Mbits/s to 675 Mbits/s) include a limiting amplifier with 6 mV input sensitivity and slice adjust option, and dissipate 430 mW (typical). When used with a positive-intrinsic negative (PIN) diode and a transimpedance amplifier (TIA) amplifier, the ADN2813 and ADN2814 can implement a low-cost, low-power fiber optic receiver.

The ADN2815 (12.3 Mbits/s to 1.25 Gbits/s) and the ADN2816 (12.3 Mbits/s to 675 Mbits/s), optimized for use with optical transceiver modules, include a limiting amplifier with 50 mV input sensitivity and dissipate 380 mW (typical).

The continuous-tuning capabilities of the CDRs, which cover all the standard OC-1/3/12 fixed-rate and multi-rate applications, also make them suited for a wider range of networking applications, including Ethernet, wave-division multiplexing (WDM) transponders, test equipment, backplanes, regenerators/repeaters, broadband cross-connects, routers, multi-service provisioning platforms (MSPP) and next-generation Sonet applications. The devices can also be used for video applications.

The ADN2813, ADN2814, ADN2815 and ADN2816 continuous-tuning CDRs
are sampling now in 5mm x 5mm 32-lead CSPs, and are respectively priced at $19.50, $11.50, $17.55 and $10.35 per unit in 1,000-piece quantities. Full production will begin
in June.

Click here for the ADN2813 data sheet.

Click here for the ADN2814 data sheet.

Click here for the ADN2815 data sheet.

Click here for the ADN2816 data sheet.

For more information, please call 1-800-ANALOG-D or visit: www.analog.com

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