Analog Devices Inc. AD9553BCPZ-REEL7

Overview

AD9553BCPZ-REEL7 from Analog Devices is a phase-locked loop (PLL)-based flexible clock translator for GPON, base station, SONET/SDH, T1/E1, and Ethernet 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-REEL7 datasheet, AD9553BCPZ-REEL7 pinout, AD9553BCPZ-REEL7 application, or AD9553BCPZ-REEL7 equivalent, this device enables precise frequency translation in telecom timing applications requiring Telcordia GR-253-compliant jitter performance, dual programmable outputs, and pin- or SPI-based configuration across industrial temperature range (−40°C to +85°C).

Technical Context

The AD9553BCPZ-REEL7 implements an integer-N PLL architecture with user-selectable loop bandwidths (170 Hz, 20 kHz, or 75 kHz) to optimize jitter transfer, generation, and tolerance per application. It supports two reference inputs (single-ended or differential) and crystal-based holdover via dedicated XTAL pins.

Its output stage provides independent LVPECL, LVDS, or CMOS drivers on OUT1 and OUT2, each configurable via OM0–OM2 pins or SPI register writes. Frequency translation is enabled either through 15×52 preset input/output combinations (via A3–A0 and Y5–Y0 pins) or arbitrary ratios using the 3-wire SPI interface.

Key Specifications

Pinout & Package

AD9553BCPZ-REEL7 is housed in a 32-lead, 5 mm × 5 mm LFCSP package (CP-32-3) with exposed pad connected to GND. Pin count and layout match the AD9553 family's standardized footprint for drop-in compatibility across variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9553BCPZ-REEL7, AD9552BCPZ-REEL7 reduces cost and complexity for single-output use cases, while Si5338A-A-GM offers greater output count and protocol coverage at the expense of holdover autonomy and higher BOM integration effort.

Availability

AD9553BCPZ-REEL7 is available at Aetrix Electronics and suitable for GPON optical line terminals, wireless base station timing modules, and SONET/SDH transport equipment requiring stable component supply, long-term lifecycle support, and carrier-grade jitter compliance.

Supply support for AD9553BCPZ-REEL7 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.

The AD9553BCPZ-REEL7 belongs to Analog Devices' precision clock generation portfolio, designed specifically for telecom infrastructure applications demanding ultra-low jitter, holdover resilience, and multi-standard frequency translation in compact form factors.

FAQ

What is the primary function of the AD9553BCPZ-REEL7 in telecom systems?

The AD9553BCPZ-REEL7 serves as a flexible clock translator that converts incoming reference frequencies (e.g., 2.048 MHz E1, 155.52 MHz SONET) into precise output clocks (e.g., 125 MHz GPON, 156.25 MHz Ethernet) with ultra-low jitter. Its integer-N PLL, on-chip VCO, and holdover capability make AD9553BCPZ-REEL7 ideal for carrier-grade timing in PON OLTs, base stations, and transport gear where synchronization integrity is critical.

Does the AD9553BCPZ-REEL7 support crystal-based holdover, and what crystal specifications are required?

Yes, the AD9553BCPZ-REEL7 supports crystal-based holdover via its dedicated XTAL pins. It requires a 25 MHz fundamental-mode crystal with ±20 ppm tolerance and 10 pF load capacitance. The device uses internal capacitors defaulting to 10 pF; crystals with 8–24 pF load capacitance can be supported by adjusting register 0x2B via SPI to match the specified value.

How many output configurations does the AD9553BCPZ-REEL7 support, and how are they selected?

The AD9553BCPZ-REEL7 supports eight output configurations (LVPECL, LVDS strong/weak, CMOS) selectable via OM0–OM2 pins in pin-strapped mode, or dynamically via SPI register writes. Each of the two outputs (OUT1 and OUT2) can be independently set to LVPECL (up to 810 MHz), LVDS (up to 810 MHz), or CMOS (up to 200 MHz), allowing mixed-signal clock distribution within a single AD9553BCPZ-REEL7 device.

What jitter performance does the AD9553BCPZ-REEL7 deliver, and which standard does it meet?

The AD9553BCPZ-REEL7 delivers jitter generation as low as 0.89 ps rms (12 kHz–20 MHz band) when configured with 25 MHz input and 125 MHz output. This performance exceeds Telcordia GR-253-CORE requirements for jitter generation, transfer, and tolerance-making AD9553BCPZ-REEL7 suitable for deployment in central office and outside plant telecom infrastructure.

Can the AD9553BCPZ-REEL7 operate with differential reference inputs, and what are the voltage requirements?

Yes, the AD9553BCPZ-REEL7 accepts differential reference inputs on REFA/REFB pins with common-mode voltage internally generated at 613–769 mV and differential sensitivity of 250 mV p-p. AC coupling is required to preserve internal DC bias; instantaneous pin voltages must remain within the 3.3 V supply rails. Single-ended CMOS-compatible inputs (0.008–200 MHz) are also supported on either REFA or REFB alone.