Analog Devices Inc. ADN2813ACPZ

Overview

ADN2813ACPZ from Analog Devices is a continuous-rate clock and data recovery (CDR) IC with integrated limiting amplifier, supporting 10 Mb/s to 1.25 Gb/s NRZ data streams. It performs quantization, loss-of-signal detection, and jitter-compliant clock/data retiming without external reference clock. Key confirmed specs: 3.3 mV typical input sensitivity, ±95 mV adjustable slice level, and 0.003 UI rms jitter generation at OC-12. It enables compact fiber-optic receiver front-ends in SONET OC-12 and GbE systems.

For engineers reviewing the ADN2813ACPZ datasheet, ADN2813ACPZ pinout, ADN2813ACPZ application, or ADN2813ACPZ equivalent, this page delivers verified technical context, real-world timing roles, package-specific layout guidance, and validated alternative options for SONET, Fibre Channel, and WDM transponder designs.

Technical Context

The ADN2813ACPZ implements a patented dual-loop architecture combining a delay-locked loop (DLL) for high-frequency jitter tracking and a phase-locked loop (PLL) with VCO for low-frequency jitter accommodation. Its quantizer achieves 3.3 mV p-p sensitivity with 290 µV rms input noise, and the LOS detector provides programmable trip points from 2.3 mV to 19 mV using external resistor THRADJ.

Jitter transfer bandwidth is 75–130 kHz for OC-12 and 26–42 kHz for OC-3, with <0.03 dB peaking - eliminating hazardous accumulation in regenerator cascades. The I²C interface (400 kHz max) enables dynamic configuration of coarse data rate readback, squelch mode, and LOS polarity, while LVDS outputs deliver 240–400 mV differential swing at 1.25 Gb/s.

Key Specifications

Pinout & Package

ADN2813ACPZ uses a 5 mm × 5 mm, 32-lead lead-frame chip-scale package (LFCSP) with exposed thermal pad on bottom requiring solder connection to PCB ground plane for thermal dissipation and signal integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock and data recovery applications.

Compared with MAX3795ETJ+ and LMH0384SQ/NOPB, the ADN2813ACPZ uniquely combines wide-rate autolock (10 Mb/s–1.25 Gb/s), SONET-compliant jitter performance, and full I²C configurability - making it the only option qualified for mixed-rate optical transport equipment requiring field-upgradable functionality.

Availability

ADN2813ACPZ is available at Aetrix Electronics and suitable for SONET regenerators, Fibre Channel receivers, WDM transponders, optical test equipment, and broadband routers requiring stable component supply across extended temperature ranges (−40°C to +85°C).

Supply support for ADN2813ACPZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, communications, and industrial applications.

The ADN2813ACPZ belongs to Analog Devices' optical communications product line, engineered specifically for jitter-critical clock and data recovery in SONET/SDH, Fibre Channel, and Ethernet optical interfaces.

FAQ

What data rates does the ADN2813ACPZ support without external programming?

The ADN2813ACPZ supports continuous data rates from 10 Mb/s to 1.25 Gb/s in lock-to-data mode with no external reference clock or firmware configuration. It automatically acquires and tracks any NRZ input within this range, including SONET OC-1 (51.84 Mb/s), OC-3 (155.52 Mb/s), OC-12 (622.08 Mb/s), and Gigabit Ethernet (1.25 Gb/s). Acquisition time varies by rate: 40 ms at 10 Mb/s, 2.0 ms at OC-12, and 1.5 ms at GbE.

How is loss-of-signal detection configured on the ADN2813ACPZ?

Loss-of-signal (LOS) detection on the ADN2813ACPZ is configured using the external resistor THRADJ connected to Pin 9. With R_TH = 0 Ω, LOS triggers between 14–19 mV p-p; with R_TH = 100 kΩ, the range shifts to 2.3–4.7 mV p-p. Hysteresis is built-in (4.6–8.0 dB depending on R_TH and data rate) to prevent chatter. The LOS output (Pin 22) is an active-high LVTTL signal with 500 ns assert time under dc-coupled conditions.

Does the ADN2813ACPZ require an external reference clock?

No, the ADN2813ACPZ operates in autonomous lock-to-data mode without any external reference clock. It uses an internal frequency acquisition loop to set VCO coarse tuning and achieves full jitter compliance (transfer, generation, tolerance) across its entire 10 Mb/s–1.25 Gb/s range. An optional differential REFCLKP/N input (Pins 10/11) is provided only for applications requiring synchronous locking to a system master clock - such as multi-channel phase-aligned CDR arrays - but is not required for basic operation.

What is the significance of the exposed thermal pad on the ADN2813ACPZ package?

The exposed thermal pad on the bottom of the ADN2813ACPZ's 32-lead LFCSP must be soldered to a PCB ground plane. This pad serves two critical functions: (1) thermal dissipation - lowering junction temperature by reducing θ_JA to 28°C/W on a 4-layer board - and (2) EMI suppression - providing low-inductance return path for high-speed LVDS outputs (CLKOUTP/N, DATAOUTP/N) and minimizing radiated emissions in dense optical modules.

Can the ADN2813ACPZ interface directly with a PIN diode and TIA?

Yes, the ADN2813ACPZ is explicitly designed to interface directly with a PIN photodiode and transimpedance amplifier (TIA) in a highly integrated fiber-optic receiver. Its CML-compatible differential inputs (PIN/NIN) accept ac-coupled signals with 2.5 V internal common-mode bias, eliminating external biasing components. Combined with its integrated limiting amplifier and 3.3 mV p-p sensitivity, this enables compact, low-power SFP/SFF module implementations without discrete gain stages.