Analog Devices Inc. ADN2804ACPZ

Overview

ADN2804ACPZ from Analog Devices is a 622 Mbps clock and data recovery (CDR) IC with integrated limiting amplifier, designed for SONET OC-12 receiver front-ends. It performs quantization, signal-level detection, jitter-tolerant clock recovery, and data retiming without external reference clock. Key confirmed parameters: 622 Mbps NRZ data rate, 3.3 mV typical quantizer sensitivity, ±95 mV adjustable slice level, 0.003 UI rms jitter generation, and 5 mm × 5 mm 32-lead LFCSP package. Used in BPON ONT and WDM transponder receivers.

For engineers reviewing the ADN2804ACPZ datasheet, ADN2804ACPZ pinout, ADN2804ACPZ application, or ADN2804ACPZ equivalent, this page delivers verified technical context, SONET-compliant jitter specs, LVDS output timing, I²C-configurable LOS/LOL functions, and real-world deployment guidance for fiber-optic regenerators and test equipment.

Technical Context

The ADN2804ACPZ 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 supports ac- or dc-coupled CML inputs at 100 Ω differential impedance.

Jitter performance meets and exceeds Telcordia GR-253-CORE for SONET OC-12: jitter transfer bandwidth 75–130 kHz, jitter peaking ≤0.03 dB, jitter tolerance down to 1.0 UI p-p at 250 kHz, and jitter generation as low as 0.001 UI rms (12 kHz–5 MHz). The device features independent slice-level adjust and LOS detection with programmable threshold (2.6–18.4 mV) and hysteresis.

Key Specifications

Pinout & Package

ADN2804ACPZ uses a 5 mm × 5 mm, 32-lead lead-frame chip-scale package (LFCSP) with exposed paddle soldered to ground. Pin 1 (TEST1) and Pin 32 (TEST2) are tied to VCC; the exposed pad must be connected to GND for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADN2804ACPZ, MAX3675 demands external clock infrastructure and exhibits higher jitter generation, while LMH0384 operates at incompatible data rates and lacks SONET jitter compliance-making ADN2804ACPZ the sole validated choice for OC-12 regenerator and BPON ONT receiver designs.

Availability

ADN2804ACPZ is available at Aetrix Electronics and suitable for BPON ONT receivers, SONET OC-12 regenerators, and WDM transponder line cards requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADN2804ACPZ 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, communications, and industrial markets since 1965.

The ADN2804ACPZ belongs to Analog Devices' optical networking CDR product line, engineered specifically for SONET/SDH infrastructure applications demanding ultra-low jitter, reference-free operation, and compact integration in fiber-receiver subsystems.

FAQ

What is the primary function of the ADN2804ACPZ in a fiber-optic receiver chain?

The ADN2804ACPZ serves as a clock and data recovery IC with integrated limiting amplifier, performing quantization, loss-of-signal detection, jitter-tolerant clock recovery, and data retiming for 622 Mbps NRZ signals. In a typical BPON ONT receiver, it follows the PIN diode and TIA preamplifier to restore clean clock and data outputs-enabling error-free decoding without external reference clock. Its 3.3 mV sensitivity and SONET-compliant jitter performance make ADN2804ACPZ essential for telecom-grade optical link integrity.

Does the ADN2804ACPZ require an external reference clock to operate?

No, the ADN2804ACPZ does not require an external reference clock for standard operation. It automatically locks to 622 Mbps NRZ data in ≤2.0 ms using its patented DLL+PLL architecture. An optional differential reference clock (10–160 MHz) can be applied to REFCLKP/REFCLKN pins to force lock-to-reference mode-useful for synchronization in multi-channel systems-but this is not required for basic CDR functionality. The ADN2804ACPZ remains fully operational as a standalone CDR with ADN2804ACPZ's native autolock capability.

How is loss-of-signal (LOS) detection configured on the ADN2804ACPZ?

LOS detection on the ADN2804ACPZ is configured via the THRADJ pin, which accepts an external resistor to set the detection threshold between 2.6 mV and 18.4 mV p-p differential input. The LOS output (Pin 22) is an active-high LVTTL signal asserting within 500 ns (dc-coupled) when input falls below threshold. Hysteresis (4.1–8.1 dB) prevents chatter, and polarity is configurable via I²C register CTRLC. This makes ADN2804ACPZ adaptable to varying photodiode responsivity and link power budgets without hardware changes.

What are the key jitter specifications of the ADN2804ACPZ relevant to SONET OC-12 compliance?

The ADN2804ACPZ exceeds Telcordia GR-253-CORE SONET OC-12 requirements: jitter transfer bandwidth is 75–130 kHz with ≤0.03 dB peaking; jitter generation is 0.001–0.003 UI rms (12 kHz–5 MHz); and jitter tolerance is 1.0 UI p-p at 250 kHz. These values ensure the ADN2804ACPZ can be deployed in regenerators and repeaters without contributing to hazardous jitter accumulation in cascaded networks-validating ADN2804ACPZ for carrier-class optical infrastructure.

Can the ADN2804ACPZ interface with standard microcontrollers for configuration and monitoring?

Yes, the ADN2804ACPZ includes a standard I²C interface (SCK/SDA pins) supporting 400 kHz clock rate and LVTTL-compatible voltage levels. It exposes registers for reading data rate accuracy (±100 ppm), LOS/LOL status, and configuring squelch mode, LOS polarity, and LOL reset behavior. This allows direct connection to ARM/FPGA-based controllers without level-shifting, enabling real-time health monitoring and adaptive configuration of ADN2804ACPZ in field-deployed optical modules.