Analog Devices Inc. AD9572ACPZLVD-RL

Overview

AD9572ACPZLVD-RL from Analog Devices is a dual-PLL, 7-output clock generator IC optimized for fiber channel and Gigabit Ethernet line cards. It delivers seven synchronized clock outputs - including 156.25 MHz (LVPECL/LVDS), dual 106.25 MHz (LVPECL/LVDS), dual 100/125 MHz (LVPECL/LVDS), 33.33 MHz (CMOS), and 25 MHz (CMOS) - with ultra-low jitter (0.19 ps rms at 156.25 MHz, 1.875–20 MHz band) and 3.3 V single-supply operation in a 6 mm × 6 mm LFCSP package.

For engineers reviewing the AD9572ACPZLVD-RL datasheet, AD9572ACPZLVD-RL pinout, AD9572ACPZLVD-RL application, or AD9572ACPZLVD-RL equivalent, this page provides verified technical context, validated pin functions, confirmed jitter performance across all output formats, real-world application configurations, and two rigorously cross-checked alternative clock generators for fiber channel and Ethernet timing systems.

Technical Context

The AD9572ACPZLVD-RL integrates two independent integer-N PLL cores: one dedicated to Fibre Channel (FC) timing (156.25 MHz) and another for Gigabit Ethernet (GbE) timing (106.25 MHz), each with preprogrammed feedback and output dividers. Both PLLs use low-noise PFDs, precision charge pumps, and low-phase-noise VCOs, eliminating external loop filter components.

Output format selection (LVPECL or LVDS) is controlled per bank via strapping pins (FREQSEL, REFSEL), while FORCE_LOW enables active low-state forcing on the 33.33 MHz CMOS output. All seven outputs are simultaneously active with configurable enable/disable via pin strapping, and the device accepts only a 25 MHz crystal or reference clock input.

Key Specifications

Pinout & Package

AD9572ACPZLVD-RL uses a 40-lead, 6 mm × 6 mm lead frame chip scale package (LFCSP) with an exposed thermal paddle that must be soldered to ground for electrical integrity and thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-output clock generator applications.

Compared with Si5338A-A-GM and ICS8430I-01T, AD9572ACPZLVD-RL uniquely combines FC-optimized presets, integrated CMOS outputs, and sub-0.2 ps jitter at 106.25 MHz - making it the only solution that satisfies both Fibre Channel timing masks and mixed-signal line card architecture without external components.

Availability

AD9572ACPZLVD-RL is available at Aetrix Electronics and suitable for fiber channel line cards, Gigabit Ethernet switches, PCIe root complexes, and optical transport network equipment requiring stable component supply and long-term industrial lifecycle support.

Supply support for AD9572ACPZLVD-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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD9572ACPZLVD-RL belongs to Analog Devices' AD95xx clock generation family, engineered specifically for low-jitter, multi-protocol timing in telecom and datacom infrastructure where phase noise and deterministic jitter directly impact bit error rate.

FAQ

What is the primary clock input requirement for AD9572ACPZLVD-RL?

The AD9572ACPZLVD-RL requires a 25 MHz input - either from a fundamental-mode crystal connected across pins 6 and 7 (XO), or a single-ended 25 MHz clock applied to pin 8 (REFCLK). The crystal must have 14 pF load capacitance, ≤50 Ω ESR, and ±30 ppm stability. No other input frequencies are supported; the device does not accept variable or programmable reference inputs.

Does AD9572ACPZLVD-RL support both LVPECL and LVDS outputs simultaneously?

Yes, AD9572ACPZLVD-RL supports mixed output formats: the 156.25 MHz outputs (pins 17–18) can be configured as LVPECL or LVDS, and the 100/125 MHz outputs (pins 19–22) and 106.25 MHz outputs (pins 29–32) share the same format selection via FREQSEL and REFSEL strapping. However, all differential outputs on the same bank must use the same format - LVPECL and LVDS cannot be mixed within a single output pair.

How is the 100 MHz vs. 125 MHz output selected on AD9572ACPZLVD-RL?

The 100 MHz or 125 MHz output on pins 19/20/21/22 is selected by the logic state of pin 27 (FREQSEL): a logic high (≥2.2 V) selects 125 MHz, and a logic low (≤0.8 V) selects 100 MHz. This is a hardwired strap - no register write or dynamic reconfiguration is possible. The selection applies identically to both differential pairs (19/20 and 21/22).

What is the function of the FORCE_LOW pin on AD9572ACPZLVD-RL?

Pin 37 (FORCE_LOW) is an active-high control that forces the 33.33 MHz CMOS output (pin 23) into a static logic low state, regardless of internal PLL operation. This is used during power-down sequencing or system reset to prevent unintended clocking of downstream logic. It does not affect any other outputs or internal PLL functionality.

Is the exposed paddle on the AD9572ACPZLVD-RL package electrically connected?

Yes, the exposed paddle on the AD9572ACPZLVD-RL's 40-lead LFCSP package is an electrical connection - not just thermal - and must be soldered to the PCB ground plane. Failure to connect it to GND will cause improper biasing of internal LDOs, leading to unstable operation or complete functional failure. The datasheet explicitly states the paddle is "an electrical connection as well as a thermal enhancement."