Analog Devices Inc. AD9559BCPZ-REEL7

Overview

AD9559BCPZ-REEL7 from Analog Devices is a dual-digital-PLL adaptive clock translator IC for telecom synchronization, supporting four reference inputs (2 kHz–1250 MHz), 20-bit input dividers, and programmable 17-bit integer + 23-bit fractional feedback dividers. It delivers jitter-cleaned outputs from 262 kHz to 1250 MHz in LVDS/HSTL/CMOS formats and meets GR-1244 Stratum 3 holdover and ITU-T G.8262 SyncE node clock requirements in network line cards.

For engineers reviewing the AD9559BCPZ-REEL7 datasheet, AD9559BCPZ-REEL7 pinout, AD9559BCPZ-REEL7 application, or AD9559BCPZ-REEL7 equivalent, key selection considerations include dual-DPLL architecture with holdover resilience, reference switchover phase perturbation <±100 ps, 0.1 Hz–2 kHz digital loop filter bandwidth, and compliance with Telcordia GR-253 jitter transfer/generation for OC-192 SONET/SDH systems.

Technical Context

The AD9559BCPZ-REEL7 implements two independent digital PLLs (DPLL₀/DPLL₁), each with programmable 17-bit integer and 23-bit fractional N-dividers and a digitally configurable loop filter (0.1 Hz–2 kHz bandwidth). Reference validation operates at ±2 ppm accuracy, and auto/manual switchover supports seamless transitions between up to four differential or single-ended inputs without output phase disturbance.

Each DPLL drives an analog PLL (APLL₀/APLL₁) with VCO ranges of 2940–3543 MHz and 3405–4260 MHz respectively, enabling low-noise frequency multiplication. The 4×2 crosspoint switch allows any reference input to feed either DPLL, while on-chip EEPROM stores multiple power-up profiles for rapid reconfiguration in OTN mapping/demapping applications.

Key Specifications

Pinout & Package

AD9559BCPZ-REEL7 is housed in a 72-lead, 10 mm × 10 mm LFCSP package with exposed thermal pad. Pin functions are defined per Analog Devices' Rev. D datasheet (pp. 16–22), including dedicated reference inputs (REF_A–REF_D), system clock inputs (XOA/XOB), eight clock outputs (OUT0A/OUT0B/OUT1A/OUT1B pairs), SPI/I²C serial interface pins (CS/SCLK/SDIO/SDO), and multifunction logic pins (M0–M5).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5342-A01AGM and LMK04832RHAT, AD9559BCPZ-REEL7 uniquely combines dual-DPLL holdover resilience, four-reference flexibility, and full Telcordia/ITU-T certification-making it the only option for carrier-grade multiservice line cards requiring zero-phase-disturbance switchover and OTN-adaptive translation.

Availability

AD9559BCPZ-REEL7 is available at Aetrix Electronics and suitable for synchronous Ethernet node clocks, SONET/SDH OC-192 line cards, and OTN mapping/demapping applications requiring stable component supply, long-term lifecycle support, and telecom-grade reliability.

Supply support for AD9559BCPZ-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 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 AD9559BCPZ-REEL7 belongs to Analog Devices' AD95xx clock translation and jitter attenuation product line, engineered specifically for carrier-class telecom infrastructure requiring Stratum 3 holdover, GR-253 compliance, and adaptive OTN timing.

FAQ

What telecom standards does the AD9559BCPZ-REEL7 comply with?

The AD9559BCPZ-REEL7 complies with Telcordia GR-1244 (Stratum 3 holdover), GR-253 (jitter generation, transfer, and tolerance for OC-192), and ITU-T G.8262 (SyncE node clocks), plus G.823/G.824/G.825/G.8261. These certifications are verified in the Rev. D datasheet under Applications and Specifications sections and confirmed by Analog Devices' official compliance documentation.

Does the AD9559BCPZ-REEL7 support both SPI and I²C interfaces?

Yes, the AD9559BCPZ-REEL7 supports both SPI and I²C serial interfaces. Interface selection is controlled by the state of the M5 pin at power-up: low for SPI, high for I²C. Full timing specifications-including 40 MHz SPI clock rate and 400 kHz I²C bus speed-are provided in Tables 14 and 15 of the Rev. D datasheet.

How many clock outputs does the AD9559BCPZ-REEL7 provide, and what formats are supported?

The AD9559BCPZ-REEL7 provides eight clock output terminals organized as four pairs (OUT0A/OUT0B, OUT1A/OUT1B, etc.). Each pair is configurable as one differential LVDS or HSTL output (262 kHz–1250 MHz) or two single-ended CMOS outputs (up to 250 MHz for 1.8 V, 25 MHz/250 MHz for 3.3 V strong/weak drive). Driver type and frequency are independently programmable per channel.

What is the minimum reference input frequency the AD9559BCPZ-REEL7 can accept?

The AD9559BCPZ-REEL7 accepts reference input frequencies as low as 2 kHz in single-ended CMOS mode, as specified in Table 5 of the Rev. D datasheet. This ultra-low-frequency capability enables compatibility with precision TCXOs, atomic clock references, and GPS-disciplined oscillators used in holdover-critical infrastructure.

Can the AD9559BCPZ-REEL7 operate without an external crystal?

Yes, the AD9559BCPZ-REEL7 can operate without an external crystal by using an external system clock applied to the XOA/XOB pins (10–400 MHz differential). However, the optional crystal resonator path (10–50 MHz fundamental-mode AT-cut) is recommended for optimal jitter performance and holdover stability, especially in Stratum 3 applications where system clock accuracy directly impacts holdover drift.