Analog Devices Inc. ADN2819ACPZ-CML-RL

Overview

ADN2819ACPZ-CML-RL from Analog Devices is a multirate clock and data recovery (CDR) IC with integrated limiting amplifier, supporting 2.7 Gbps operation for SONET OC-48/SDH STM-16, Gigabit Ethernet, and 15/14 FEC rates. It delivers jitter transfer ≤880 kHz, jitter generation as low as 0.002 UI rms, and loss-of-signal detection down to 3 mV. Used in fiber-optic receiver front ends with PIN diode and TIA.

For engineers reviewing the ADN2819ACPZ-CML-RL datasheet, ADN2819ACPZ-CML-RL pinout, ADN2819ACPZ-CML-RL application, or ADN2819ACPZ-CML-RL equivalent, key selection criteria include CML output compatibility, 7 mm × 7 mm 48-lead LFCSP package, reference clock flexibility (19.44–155.52 MHz), adjustable slice level (±100 mV), and guaranteed SONET-compliant jitter performance across OC-3/OC-12/OC-48 rates.

Technical Context

The ADN2819ACPZ-CML-RL implements a hybrid delay-locked loop (DLL) and phase-locked loop (PLL) architecture to simultaneously achieve wideband jitter accommodation and narrow-band jitter filtering. Its dual-loop design separates high-frequency jitter tracking (via voltage-controlled phase shifter) from low-frequency tracking (via VCO), eliminating closed-loop zeros and minimizing jitter peaking.

It supports native and 15/14 digital wrapper rates using a single reference clock frequency - selectable among 19.44 MHz, 38.88 MHz, 77.76 MHz, or 155.52 MHz - with LVPECL/LVDS/LVCMOS/LVTTL-compatible REFCLK inputs. The on-chip oscillator enables crystal-based timing when external REFCLK is unavailable.

Key Specifications

Pinout & Package

The ADN2819ACPZ-CML-RL is housed in a 7 mm × 7 mm, 48-lead lead-frame chip-scale package (LFCSP) with exposed paddle soldered to VCC. Pin 1 is marked by a dot; the exposed pad (EPAD) must be connected to VCC via multiple vias for thermal and electrical performance.

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 ADN2819ACPZ-CML-RL uniquely integrates limiting amplification, on-chip oscillator, and SONET-compliant jitter performance in a single 7 mm × 7 mm package - reducing bill-of-materials and layout complexity for OC-3/OC-12/OC-48 systems.

Availability

ADN2819ACPZ-CML-RL is available at Aetrix Electronics and suitable for SONET regenerators, WDM transponder receivers, Gigabit Ethernet backplanes, and optical test equipment requiring stable component supply, long-term lifecycle support, and guaranteed SONET jitter compliance.

Supply support for ADN2819ACPZ-CML-RL 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 ADN2819ACPZ-CML-RL belongs to Analog Devices' clock and data recovery product line, engineered specifically for telecom and datacom applications demanding SONET/SDH-compliant jitter performance, multirate flexibility, and integration of limiting amplification in compact packages.

FAQ

What reference clock frequencies does the ADN2819ACPZ-CML-RL support?

The ADN2819ACPZ-CML-RL supports four fixed reference clock frequencies: 19.44 MHz, 38.88 MHz, 77.76 MHz, and 155.52 MHz. These correspond to SONET OC-1/OC-3/OC-12/OC-48 base rates and their harmonics. The device uses a single REFCLK for all supported data rates including 15/14 FEC wrappers - no clock switching or reconfiguration is needed when changing data rates. LVPECL and LVDS inputs are only valid at 155.52 MHz per the datasheet.

Does the ADN2819ACPZ-CML-RL require an external limiting amplifier?

No, the ADN2819ACPZ-CML-RL includes an integrated limiting amplifier as part of its signal chain. This eliminates the need for an external limiter stage when interfacing with transimpedance amplifiers (TIAs) in optical receiver modules. The quantizer input sensitivity of 4 mV p-p (typical) is specified with the internal limiter enabled, and the device is designed to operate directly after a TIA in standard fiber-optic receiver architectures.

How is loss-of-signal (LOS) detection configured on the ADN2819ACPZ-CML-RL?

LOS detection on the ADN2819ACPZ-CML-RL is configured via the THRADJ pin, which accepts an external resistor to set the SDOUT trip threshold between 0.7 mV and 18.0 mV depending on resistance value (2 Ω to 90 kΩ). Hysteresis is programmable from 3.2 dB to 9.9 dB based on RTHRESH and data rate. The SDOUT output is an active-high LVTTL signal with <0.3 μs response time under dc-coupled conditions, and includes built-in hysteresis to prevent chatter near threshold.

What are the key jitter specifications met by the ADN2819ACPZ-CML-RL?

The ADN2819ACPZ-CML-RL meets Telcordia GR-253-CORE SONET/SDH requirements for jitter transfer, generation, and tolerance across OC-3, OC-12, OC-48, and GbE rates. Key values include jitter transfer bandwidths of 48–880 kHz, jitter generation as low as 0.002 UI rms, and jitter tolerance up to 92 UI p-p at 600 Hz (OC-48). All jitter specs are guaranteed over –40°C to +85°C ambient temperature.

Can the ADN2819ACPZ-CML-RL operate without an external reference clock?

Yes, the ADN2819ACPZ-CML-RL can operate without an external reference clock by enabling its on-chip 19.44 MHz oscillator using an external crystal connected to XO1/XO2 pins. The REFSEL pin selects between internal oscillator (REFSEL = 0) and external REFCLK (REFSEL = 1). When using the internal oscillator, the device still supports all multirate functions - including OC-48 and 15/14 FEC - without requiring external clock synthesis.