ADN2811ACPZ-CML

Overview

The ADN2811ACPZ-CML is a clock and data recovery (CDR) integrated circuit designed for SONET OC-48 and SDH STM-16 applications, including 15/14 FEC digital wrapper rates. It operates at data rates of 2.48 Gbps and 2.66 Gbps with a single-supply voltage range of 3.0 V to 3.6 V. The device features CML differential inputs and outputs, a typical power consumption of 540 mW, and an operating temperature range from -40°C to +85°C. Packaged in a 48-lead LFCSP (7 mm × 7 mm), it integrates quantization, signal level detection, and jitter-compliant clock recovery.

Feature Summary

• Patented delay-locked and phase-locked loop architecture minimizes jitter peaking while providing wideband jitter accommodation.
• Supports both native OC-48 (2.48 Gbps) and 15/14 FEC (2.66 Gbps) rates using a single reference clock frequency.
• Meets stringent SONET requirements for jitter transfer, generation, and tolerance as defined by Telcordia GR-253-CORE.
• Includes adjustable slice levels (±100 mV) to mitigate amplified spontaneous emission noise and a programmable loss-of-signal detector.

Applications

• SONET OC-48 and SDH STM-16 transponders
• WDM system regenerators and repeaters
• Optical test equipment
• Backplane communication interfaces

Procurement Notes

Verify the specific suffix 'CML' against the manufacturer's official ordering guide to confirm interface compatibility. Confirm availability status through authorized distributors, as supply conditions may vary. Ensure compliance with RoHS directives and moisture sensitivity levels prior to procurement.

Selection Notes

Select this component for designs requiring strict adherence to SONET/SDH jitter masks without external filtering. Ensure the PCB layout supports the 48-lead LFCSP package with adequate thermal dissipation for the exposed pad. Verify that the reference clock source matches one of the supported frequencies: 19.44 MHz, 38.88 MHz, 77.76 MHz, or 155.52 MHz.

Part Context

The ADN2811 belongs to Analog Devices' specialized timing and clock recovery family, targeting high-speed optical networking infrastructure. It serves as a core receiver component for converting serial optical signals into retimed electrical data streams suitable for downstream processing in telecom systems.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate alternative CDR devices based on pin compatibility, jitter performance metrics, and package dimensions if direct replacement is required.

FAQ

How does the ADN2811 handle jitter peaking compared to conventional PLLs?

The ADN2811 utilizes a patented architecture combining a delay-locked loop and a phase-locked loop. This design places the zero required for frequency compensation in the feedback path rather than the closed-loop transfer function, effectively minimizing jitter peaking.

What reference clock frequencies are supported?

The device supports reference clocks of 19.44 MHz, 38.88 MHz, 77.76 MHz, and 155.52 MHz. The first three frequencies accept LVPECL, LVDS, LVCMOS, or LVTTL inputs, while 155.52 MHz is limited to LVPECL or LVDS.

Can the ADN2811 operate with both OC-48 and OC-48 FEC rates simultaneously?

No, the data rate is selected via the RATE input pin. Setting RATE to 0 configures the device for OC-48 (2.48 Gbps), while setting it to 1 configures it for OC-48 FEC (2.66 Gbps). A single reference clock frequency can be used for both modes.