Analog Devices is introducing a family of continuous-tuning clock and data recovery (CDR) integrated circuits (ICs) for fixed-rate, multi-rate and continuous-tuning data communications and telecom applications. The pin-compatible ADN2813, ADN2814, ADN2815 and ADN2816 family of CDRs eases optical network design by providing the industry’s widest performance margin beyond SONET jitter specifications. Offered in a variety of price and power points to suit the entire range of networking applications at 1.25 Gbps (gigabits per second) and below, the new devices are pin-compatible with ADI’s ADN2812, the first fully automatic continuous-tuning CDR, introduced in 2003.

Unlike other CDR solutions that are designed for specific data rates or that require external control to identify a specific frequency or band of frequencies, the continuous-tuning capabilities of the ADN2813, ADN2814, ADN2815 and ADN2816 enable the devices to recover any incoming data pattern without external control or the use of a reference clock, allowing equipment developed today to accommodate changing bit rate requirements in the future.

The family of continuous-tuning CDRs provides jitter performance that beats the SONET specifications by more than a factor of three in all categories (jitter generation, jitter tolerance, jitter transfer). Their I²C interface provides access to 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 Mbps - 1.25 Gbps) and the ADN2814 (12.3 Mbps - 675 Mbps) include a limiting amplifier with 6 mV input sensitivity and slice adjust option, and dissipate 430 mW (typical). When used with a PIN diode and a TIA amplifier, the ADN2813 and ADN2814 can implement a low-cost, low-power fiber optic receiver.

The ADN2815 (12.3 Mbps - 1.25 Gbps) and the ADN2816 (12.3 Mbps - 675 Mbps), 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 well-suited for a wider range of networking applications, including Ethernet, 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.

Availability and Pricing

The ADN2813, ADN2814, ADN2815 and ADN2816 continuous-tuning CDRs are sampling now in space-saving 5 mm × 5 mm 32-lead chip-scale packages, 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 2005.