Analog Devices Inc. AD9553BCPZ

Overview

AD9553BCPZ from Analog Devices is a phase-locked loop (PLL)-based flexible clock translator designed for GPON, base station, SONET/SDH, T1/E1, and Ethernet timing systems. It supports input frequencies from 8 kHz to 710 MHz, delivers up to 810 MHz LVPECL/LVDS outputs (200 MHz for CMOS), integrates an on-chip VCO, accepts a 25 MHz crystal for holdover, and operates from a single 3.3 V supply with <450 mW power consumption.

For engineers reviewing the AD9553BCPZ datasheet, AD9553BCPZ pinout, AD9553BCPZ application, or AD9553BCPZ equivalent, this device serves as a low-jitter, pin-programmable frequency translation solution requiring precise jitter generation (<1.31 ps rms), multi-standard compatibility (Telcordia GR-253-CORE), and dual-output programmability across LVPECL/LVDS/CMOS logic families in telecom and infrastructure timing designs.

Technical Context

The AD9553BCPZ implements an integer-N PLL architecture with user-selectable loop bandwidths (170 Hz, 20 kHz, or 75 kHz) to optimize jitter transfer, tolerance, and lock time trade-offs. It supports two reference inputs (single-ended or differential) and crystal-based holdover via dedicated XTAL pins, enabling seamless reference switchover with transient control verified across multiple bandwidth settings.

Its output circuitry provides independent configuration of OUT1 and OUT2 as LVPECL, LVDS, or CMOS - each with defined voltage swing, duty cycle (40–60%), and rise/fall times (e.g., 255–305 ps for LVPECL). The device uses a strictly CMOS process while delivering ECL- and LVDS-compatible signaling through internal level-shifting and termination-aware driver design.

Key Specifications

Pinout & Package

AD9553BCPZ is housed in a 32-lead, 5 mm × 5 mm LFCSP package (CP-32-3) with exposed thermal pad requiring connection to GND. Pin assignments are validated per Analog Devices Rev. A datasheet Figure 2 and Table 13.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock translation applications.

Compared with Si5338A-A-GM and LMK04828BISQE/NOPB, the AD9553BCPZ offers unique value in deterministic, zero-firmware clock translation with integrated holdover - reducing system complexity and qualification effort in GPON, SONET, and wireless infrastructure where rapid, repeatable startup and Telcordia compliance are mandatory.

Availability

AD9553BCPZ is available at Aetrix Electronics and suitable for GPON OLT timing, wireless base station synchronization, SONET/SDH line cards, test equipment clock generation, and Ethernet switch timing requiring stable component supply across long-lifecycle deployments.

Supply support for AD9553BCPZ 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with deep expertise in precision timing, RF, and power management.

The AD9553BCPZ belongs to Analog Devices' AD95xx clock translation and distribution product line, engineered specifically for carrier-grade telecom infrastructure where jitter performance, holdover reliability, and multi-standard flexibility are non-negotiable design requirements.

FAQ

What is the primary function of the AD9553BCPZ in telecom timing systems?

The AD9553BCPZ functions as a flexible, low-jitter clock translator that converts standard telecom reference frequencies (e.g., 25 MHz, 125 MHz, 155.52 MHz) into precise output clocks for GPON, SONET/SDH, and base station applications. Its integer-N PLL, on-chip VCO, and holdover capability make AD9553BCPZ ideal for systems requiring deterministic timing with Telcordia GR-253-CORE compliance and robust reference switchover behavior.

Does the AD9553BCPZ support crystal-based holdover, and what crystal specifications are required?

Yes, the AD9553BCPZ supports crystal-based holdover using a 25 MHz fundamental-mode crystal connected across XTAL pins (9 and 10). The crystal must have a load capacitance of 10 pF and frequency tolerance ≤20 ppm. This configuration enables AD9553BCPZ to maintain Stratum 3E-compliant timing accuracy during reference loss, as verified in ITU-T G.8262 applications.

How many output configurations does the AD9553BCPZ support, and how are they selected?

The AD9553BCPZ supports eight output configurations (LVPECL, LVDS strong/weak, CMOS) selectable via OM0–OM2 pins in pin-programmed mode, or dynamically via SPI register writes. Each of the two outputs (OUT1 and OUT2) can be independently set - enabling AD9553BCPZ to drive mixed-signaling systems such as LVPECL SerDes and CMOS logic simultaneously without external level shifters.

What jitter performance does the AD9553BCPZ deliver, and over which measurement bandwidth?

The AD9553BCPZ delivers jitter generation as low as 0.39 ps rms (50 kHz–80 MHz band) and 0.44 ps rms (12 kHz–20 MHz band) depending on input/output frequency pair and loop bandwidth setting. These values are measured per Telcordia GR-253-CORE methodology and confirmed in the AD9553BCPZ datasheet Figures 3–8 - making AD9553BCPZ suitable for Stratum 3E and synchronous Ethernet applications.

Can the AD9553BCPZ operate with differential reference inputs, and what are the electrical requirements?

Yes, the AD9553BCPZ accepts differential reference inputs via REFA and REFB pins, supporting LVDS-level signals from 8 kHz to 710 MHz. The differential input requires AC coupling, has 5 kΩ internal resistance, 3 pF capacitance, and accepts ≥250 mV p-p sensitivity. Common-mode voltage is internally generated at ~692 mV, and instantaneous pin voltage must remain within 0–3.3 V to avoid damage - ensuring safe AD9553BCPZ operation with standard LVDS sources.