Analog Devices Inc. ADN2815ACPZ

Overview

ADN2815ACPZ from Analog Devices is a continuous-rate clock and data recovery (CDR) IC for optical and serial communication receivers, supporting 10 Mb/s to 1.25 Gb/s NRZ data streams without external reference clock, delivering <0.003 UI_rms jitter generation at OC-12, LVDS clock/data outputs, and integrated loss-of-lock detection - deployed in SONET OC-12 regenerators and Fibre Channel transceivers.

For engineers reviewing the ADN2815ACPZ datasheet, ADN2815ACPZ pinout, ADN2815ACPZ application, or ADN2815ACPZ equivalent, this page delivers verified technical context, real-world timing behavior, I²C-configurable acquisition modes, jitter tolerance compliance per GR-253-CORE, and validated alternatives for high-reliability telecom signal regeneration designs.

Technical Context

The ADN2815ACPZ implements a hybrid delay-locked loop (DLL) and phase-locked loop (PLL) architecture with shared control voltage: the DLL tracks high-frequency jitter via a voltage-controlled phase shifter (≥2 UI range), while the PLL handles low-frequency components using a VCO with 10 MHz–160 MHz tuning range. Frequency acquisition uses a dedicated frequency detector that resets VCO to 10 MHz and steps coarse tuning until within ±250 ppm of input data rate.

It operates with no reference clock required (autonomous lock), but supports optional REFCLK-assisted locking via I²C-configurable DIV_FREF ratio and frequency band selection (10–20 MHz up to 80–160 MHz); loss-of-lock (LOL) is asserted at ±1000 ppm VCO error and deasserted at ±250 ppm, with static LOL mode available via MISC[4] register bit.

Key Specifications

Pinout & Package

ADN2815ACPZ is housed in a 5 mm × 5 mm, 32-lead LFCSP package with exposed thermal pad (to be soldered to GND). Pin functions are validated per Analog Devices Rev. C datasheet Figure 5 and Table 5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX3675ETJ+, ADN2815ACPZ enables seamless multi-rate interoperability without hardware changes; compared with LMK03806RHAT, it offers lower power, smaller footprint, and simpler lock management - making it optimal for space-constrained, autonomous telecom receiver stages.

Availability

ADN2815ACPZ is available at Aetrix Electronics and suitable for SONET regenerators, Fibre Channel transceivers, and Gigabit Ethernet PHY interfaces requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for telecom infrastructure programs.

Supply support for ADN2815ACPZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets since 1965.

The ADN2815ACPZ belongs to Analog Devices' Clock and Timing product line, engineered specifically for carrier-grade optical receiver subsystems requiring ultra-low jitter, autonomous multi-rate operation, and robust lock monitoring in harsh thermal environments.

FAQ

What data rates does the ADN2815ACPZ support without external configuration?

The ADN2815ACPZ supports continuous-rate operation from 10 Mb/s to 1.25 Gb/s with no external reference clock or programming required. It autonomously acquires and locks to any NRZ data stream in this range using its internal frequency detector and hybrid DLL/PLL architecture - confirmed by datasheet Table 1 and General Description section. This makes ADN2815ACPZ ideal for multi-standard systems like SONET OC-1/OC-3/OC-12 where rate changes occur dynamically.

Does the ADN2815ACPZ require an external loop filter capacitor?

Yes, the ADN2815ACPZ requires a single 0.47 µF ±20% X7R ceramic capacitor connected between CF1 (Pin 15) and CF2 (Pin 14) to set the VCO tuning bandwidth and stabilize frequency acquisition. The datasheet specifies leakage current <10 nA and insulation resistance >300 MΩ to prevent drift in acquisition time - omission or substitution invalidates jitter performance and lock reliability for ADN2815ACPZ.

How does the loss-of-lock (LOL) indicator behave on the ADN2815ACPZ?

The LOL pin (Pin 16) on ADN2815ACPZ is an LVTTL active-high output that asserts when VCO frequency error exceeds ±1000 ppm and deasserts when error falls within ±250 ppm - providing hysteresis to prevent chatter. It can also be configured as a static indicator (via CTRLB[7]) that remains asserted after first loss-of-lock until manually reset through I²C register CTRLB[6], enabling persistent fault logging in ADN2815ACPZ-based systems.

Can the ADN2815ACPZ be used with a reference clock for faster lock acquisition?

Yes, the ADN2815ACPZ supports optional REFCLK-assisted locking via differential REFCLKP/REFCLKN inputs (Pins 10/11). When enabled via I²C register CTRLA[0], it uses user-configured frequency bands (10–20 MHz to 80–160 MHz) and DIV_FREF ratios to accelerate acquisition - reducing lock time to 20.0 ms versus up to 40.0 ms in autonomous mode. This mode is validated in the Functional Description section and Table 8 of the ADN2815ACPZ datasheet.

What output standards are supported by the ADN2815ACPZ clock and data outputs?

The ADN2815ACPZ provides LVDS-compliant differential outputs on CLKOUTP/N (Pins 26/25) and DATAOUTP/N (Pins 29/28), with 300 mV typical differential swing, 100 Ω output impedance, and 115–220 ps rise/fall times. These outputs meet ANSI/TIA/EIA-644-A LVDS specifications and are designed to drive standard FPGA, ASIC, or SERDES clock/data inputs directly - no level-shifting or termination redesign needed for ADN2815ACPZ integration.