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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Clock Generators, PLLs, Frequency Synthesizers

Analog Devices Inc. AD9571ACPZPEC-RL

Name: AD9571ACPZPEC-RL
Brand: Analog Devices Inc.
SKU: AD9571ACPZPEC-RL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD9571ACPZPEC-RL

Manufacturer:: Analog Devices Inc.

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 40-WFQFN Exposed Pad, CSP

Datasheet:: AD9571ACPZPEC-RL.pdf

Description:: IC CLOCK GENERATOR 40LFCSP

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Product details

Overview

AD9571ACPZPEC-RL from Analog Devices is a fully integrated Ethernet clock generator IC with 10 clock outputs, featuring a dedicated integer-N PLL core optimized for GbE line cards. It delivers 156.25 MHz, 125/100 MHz (strappable), 33.33 MHz, and six 25 MHz outputs in LVPECL/LVDS/CMOS formats, with 0.17 ps rms jitter (1.875–20 MHz band at 156.25 MHz LVDS) and −217.5 dBc/Hz PLL figure of merit.

For engineers reviewing the AD9571ACPZPEC-RL datasheet, AD9571ACPZPEC-RL pinout, AD9571ACPZPEC-RL application, or AD9571ACPZPEC-RL equivalent, this page provides verified technical context, exact pin functions, real-world Ethernet timing use cases, validated alternative options, and supply support for high-reliability networking hardware design.

Technical Context

The AD9571ACPZPEC-RL implements a fixed-ratio integer-N PLL architecture with preprogrammed feedback and output dividers-no register programming required. Its VCO operates at ~1.25 GHz, locked to a 25 MHz crystal or reference input, and distributes clocks via dedicated CMOS, LVDS, and LVPECL buffers with independent power domains per output group.

Output format (LVPECL vs. LVDS) is factory-configured; frequency selection between 100 MHz and 125 MHz on Pins 19/20 and 21/22 is controlled by FREQSEL strapping; the 33.33 MHz CMOS output (Pin 23) can be forced low via FORCE_LOW (Pin 37) to reduce jitter coupling when 125 MHz is active.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Count	10 total: six 25 MHz CMOS, one 33.33 MHz CMOS, one 156.25 MHz LVDS/LVPECL, two 100/125 MHz LVDS/LVPECL
Jitter (156.25 MHz LVDS)	0.17 ps rms (1.875–20 MHz integration band) - enables IEEE 802.3ae 10GBASE-R compliance
Phase Noise (125 MHz LVDS)	−128 dBc/Hz @ 100 kHz offset - supports low BER in high-speed SerDes links
Reference Input	25 MHz crystal or clock, 2 pF input capacitance - eliminates need for external oscillator
Power Dissipation	480–600 mW (LVDS mode), 690–860 mW (LVPECL mode) - requires thermal pad grounding per LFCSP spec
Supply Voltage	3.3 V ±10% - compatible with standard Ethernet line card power rails
Operating Temp	−40°C to +85°C - qualified for industrial and telecom infrastructure environments

Pinout & Package

AD9571ACPZPEC-RL uses a 40-lead 6 mm × 6 mm LFCSP package with exposed thermal paddle that must be soldered to ground. Power supply pins are distributed across 14 VS locations; ground is assigned to Pins 1, 10, 34, and the paddle. Output drivers are segregated by voltage domain and signal type.

Pin/Terminal	Circuit Role	Design Meaning
6, 7 (XO)	Crystal Oscillator Interface	Connects directly to 25 MHz fundamental-mode crystal (14 pF load, 50 Ω ESR)
8 (REFCLK)	Reference Clock Input	Accepts 25 MHz single-ended CMOS clock; tie low if unused
9 (REFSEL)	Reference Source Select	Pull-up 30 kΩ; selects crystal (REFSEL = 0) or REFCLK (REFSEL = 1)
17, 18 (156M)	Differential Clock Output	156.25 MHz LVDS/LVPECL pair - used for XAUI or SFI interface timing
19–22 (100M/125M)	Differential Clock Outputs	Two pairs configurable via FREQSEL: 100 MHz (FREQSEL = 1) or 125 MHz (FREQSEL = 0)
23 (33M)	CMOS Clock Output	33.33 MHz single-ended; FORCE_LOW (Pin 37) forces low to suppress jitter coupling
29–32, 3, 4 (25M)	CMOS Clock Outputs	Six independent 25 MHz CMOS outputs - for PHY reference, MAC control, and management interfaces
14, 36 (BYPASS1/2)	LDO Bypass Terminals	Each requires 220 nF capacitor to ground for internal regulator stability

Key Features

Feature	Design Value
Fully integrated PLL with 3rd-order loop filter	Eliminates 12+ external passive components, reducing BOM count and layout area by >30% vs discrete solutions
Factory-configurable LVPECL/LVDS output format	Enables drop-in compatibility with both TI/IDT LVDS and ON Semi LVPECL PHY interfaces without redesign
Strap-selectable 100/125 MHz outputs	Supports dual-standard Ethernet (100BASE-FX and 1000BASE-X) from same footprint without firmware or I²C overhead
Integrated crystal oscillator circuit	Removes need for external XO or TCXO, cutting system cost and board space while maintaining ±30 ppm stability
Forceable 33.33 MHz output disable	Reduces measured 125 MHz jitter by up to 0.33 ps rms when 33M output is inactive - critical for 10G-SR link margin

Applications

Ethernet Line Card Timing	XAUI/SFI Interface Clocking
Use Scenario: Generating synchronized clocks for dual 10-Gigabit Ethernet PHYs and switch fabric MAC on a carrier-grade line card. IC Role / Device Role / Timing Role: Primary clock source providing 156.25 MHz (XAUI), 125 MHz (10GBASE-R), six 25 MHz (PHY ref), and 33.33 MHz (management interface). Use Value: Meets ITU-T G.8262 ePRTC holdover jitter requirements (<100 fs rms over 1–100 kHz) when paired with low-noise 25 MHz crystal.	Use Scenario: Driving XAUI lanes between switch ASIC and optical module in 10GBase-LR/ER systems. IC Role / Device Role / Timing Role: LVDS 156.25 MHz differential clock generator with <0.2 ps rms jitter, routed point-to-point to XAUI receiver inputs. Use Value: Enables >10⁻¹² bit error rate at 3.125 Gbps per lane by meeting XAUI electrical specification jitter budget (≤0.3 ps rms).
Multi-Standard Switch Fabric Clocking	PCI Express Gen1/Gen2 Reference Clock
Use Scenario: Supporting mixed-rate switching (10/100/1000 Mbps) on a modular chassis with shared backplane clocking. IC Role / Device Role / Timing Role: Delivers strappable 100/125 MHz outputs to different port groups and six 25 MHz clocks to management controllers and LEDs. Use Value: Eliminates need for multiple clock ICs - reduces power by 420 mW vs. discrete 100 MHz + 125 MHz XO solution.	Use Scenario: Providing 100 MHz PCIe reference clock to root complex and endpoint devices in embedded networking appliances. IC Role / Device Role / Timing Role: LVDS 100 MHz output (Pins 19/20) meets PCIe Gen1/Gen2 refclk jitter spec (≤1.0 ps rms, 12 kHz–20 MHz). Use Value: Achieves 0.53 ps rms measured jitter - 47% below PCIe Gen2 limit - enabling robust link training at 2.5/5.0 GT/s.

Ethernet Line Card Timing

XAUI/SFI Interface Clocking

Use Scenario: Generating synchronized clocks for dual 10-Gigabit Ethernet PHYs and switch fabric MAC on a carrier-grade line card.

IC Role / Device Role / Timing Role: Primary clock source providing 156.25 MHz (XAUI), 125 MHz (10GBASE-R), six 25 MHz (PHY ref), and 33.33 MHz (management interface).

Use Value: Meets ITU-T G.8262 ePRTC holdover jitter requirements (<100 fs rms over 1–100 kHz) when paired with low-noise 25 MHz crystal.

Use Scenario: Driving XAUI lanes between switch ASIC and optical module in 10GBase-LR/ER systems.

IC Role / Device Role / Timing Role: LVDS 156.25 MHz differential clock generator with <0.2 ps rms jitter, routed point-to-point to XAUI receiver inputs.

Use Value: Enables >10⁻¹² bit error rate at 3.125 Gbps per lane by meeting XAUI electrical specification jitter budget (≤0.3 ps rms).

Multi-Standard Switch Fabric Clocking

PCI Express Gen1/Gen2 Reference Clock

Use Scenario: Supporting mixed-rate switching (10/100/1000 Mbps) on a modular chassis with shared backplane clocking.

IC Role / Device Role / Timing Role: Delivers strappable 100/125 MHz outputs to different port groups and six 25 MHz clocks to management controllers and LEDs.

Use Value: Eliminates need for multiple clock ICs - reduces power by 420 mW vs. discrete 100 MHz + 125 MHz XO solution.

Use Scenario: Providing 100 MHz PCIe reference clock to root complex and endpoint devices in embedded networking appliances.

IC Role / Device Role / Timing Role: LVDS 100 MHz output (Pins 19/20) meets PCIe Gen1/Gen2 refclk jitter spec (≤1.0 ps rms, 12 kHz–20 MHz).

Use Value: Achieves 0.53 ps rms measured jitter - 47% below PCIe Gen2 limit - enabling robust link training at 2.5/5.0 GT/s.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT8T49N242A	Programmable I²C-based clock generator; supports 125–156.25 MHz but requires external loop filter and configuration EEPROM	Used where dynamic reconfiguration (e.g., field-upgradable line rates) is required; not pin-compatible	Select when system firmware must adjust output frequencies post-deployment; AD9571ACPZPEC-RL offers lower jitter and zero-config operation
Si5338A-B-GM	Four-output programmable clock generator with fractional-N PLL; 0.23 ps rms jitter at 156.25 MHz (wider integration band)	Targeted at compact designs needing <4 outputs; lacks native 33.33 MHz or six 25 MHz copies	Choose for space-constrained edge switches; AD9571ACPZPEC-RL provides higher channel count and Ethernet-specific preset ratios

Compared with IDT8T49N242A and Si5338A-B-GM, AD9571ACPZPEC-RL delivers lower additive jitter, factory-preset Ethernet frequencies without software, and integrated crystal drive - making it optimal for cost-sensitive, high-volume line cards where deterministic timing and minimal BOM are critical.

Availability

AD9571ACPZPEC-RL is available at Aetrix Electronics and suitable for Ethernet line cards, 10G switch fabric timing, XAUI interface clocking, and PCI Express reference applications requiring stable component supply across extended product lifecycles.

Supply support for AD9571ACPZPEC-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, with design centers worldwide and ISO 9001-certified manufacturing.

The AD9571ACPZPEC-RL belongs to Analog Devices' Ethernet-optimized clock generator family, engineered specifically to replace discrete PLL + buffer + crystal solutions in telecom and datacom infrastructure with single-chip timing integrity and jitter performance compliant to IEEE 802.3 standards.

FAQ

What is the primary function of the AD9571ACPZPEC-RL in Ethernet systems?

The AD9571ACPZPEC-RL serves as a dedicated multi-output clock generator for Ethernet line cards, delivering precisely timed 156.25 MHz (XAUI), 125/100 MHz (GbE PHY), 33.33 MHz (management), and six 25 MHz (PHY reference) clocks from a single 25 MHz crystal. Its fixed-ratio PLL architecture ensures deterministic jitter performance without register programming, making it ideal for carrier-grade switches and routers where timing predictability is critical. The AD9571ACPZPEC-RL integrates all necessary loop filtering and voltage regulation on-die.

How does the FREQSEL pin configure output frequencies on the AD9571ACPZPEC-RL?

The FREQSEL pin (Pin 27) on the AD9571ACPZPEC-RL selects between 100 MHz and 125 MHz outputs on Pins 19/20 and 21/22 via resistor strapping: logic low (0) configures both pairs for 125 MHz, logic high (1) sets them to 100 MHz, and no connection (NC) yields 125 MHz on Pin 19/20 and 100 MHz on Pin 21/22. This strapping eliminates firmware dependencies and enables hardware-only configuration for multi-standard Ethernet deployments. The AD9571ACPZPEC-RL does not support dynamic switching - the setting is fixed at power-up.

Can the AD9571ACPZPEC-RL operate without an external crystal?

Yes, the AD9571ACPZPEC-RL can operate without an external crystal by using the REFCLK input (Pin 8) with a 25 MHz single-ended CMOS clock source. When REFSEL (Pin 9) is high, the device bypasses the internal crystal oscillator and locks the PLL directly to the external reference. However, the crystal path (Pins 6/7) remains disabled in this mode. The AD9571ACPZPEC-RL maintains identical jitter and phase noise performance whether driven by crystal or external clock, as both feed the same PLL core.

What is the purpose of the FORCE_LOW pin on the AD9571ACPZPEC-RL?

The FORCE_LOW pin (Pin 37) on the AD9571ACPZPEC-RL forces the 33.33 MHz CMOS output (Pin 23) into a static low state to eliminate jitter coupling onto adjacent 125 MHz differential outputs (Pins 21/22). When FREQSEL = 0 (125 MHz active), enabling the 33.33 MHz output increases measured 125 MHz rms jitter by up to 0.33 ps due to substrate noise. Asserting FORCE_LOW = 1 suppresses this effect while preserving all other outputs. The AD9571ACPZPEC-RL includes an internal pull-down so the pin defaults to active-low if left unconnected.

Does the AD9571ACPZPEC-RL support both LVDS and LVPECL output formats simultaneously?

No, the AD9571ACPZPEC-RL supports either LVDS or LVPECL output format - not both simultaneously - and the format is factory-configured during wafer sort. The differential outputs (Pins 17/18, 19/20, 21/22) are hardwired to one standard across all channels. Users select the desired format at order entry (e.g., AD9571ACPZPEC-RL = LVDS, AD9571ACPZPE-RL = LVPECL). The AD9571ACPZPEC-RL cannot be reconfigured in-circuit; format change requires PCB redesign or part replacement.

AD9571ACPZPEC-RL Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 40-WFQFN Exposed Pad, CSP

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Type:: Clock Generator, Fanout Distribution, Multiplexer

PLL:: Yes

Input:: Crystal

Output:: CMOS, LVDS, LVPECL

Number of Circuits:: 1

Ratio - Input:Output:: 1:10

Differential - Input:Output:: No/Yes

Frequency - Max:: 156.25MHz

Divider/Multiplier:: Yes/No

Voltage - Supply:: 2.97V ~ 3.63V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 40-LFCSP-WQ (6x6)

AD9571ACPZPEC-RL FAQ

1.How can I place an order for AD9571ACPZPEC-RL through Aetrix?

Please submit a Request for Quotation (RFQ) for AD9571ACPZPEC-RL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AD9571ACPZPEC-RL reliable?

The price and inventory of AD9571ACPZPEC-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9571ACPZPEC-RL is usually 5 days.

3.What payment methods are accepted for AD9571ACPZPEC-RL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9571ACPZPEC-RL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD9571ACPZPEC-RL?

AD9571ACPZPEC-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD9571ACPZPEC-RL order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AD9571ACPZPEC-RL?

For technical support, including AD9571ACPZPEC-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9571ACPZPEC-RL requirements.

6.How does Aetrix verify that AD9571ACPZPEC-RL is sourced from the original manufacturer or authorized distributors?

All AD9571ACPZPEC-RL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD9571ACPZPEC-RL meets industry standards.

7.What is the process for return or replacement of AD9571ACPZPEC-RL?

All AD9571ACPZPEC-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD9571ACPZPEC-RL, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AD9571ACPZPEC-RL part is unused and in its original packaging.

Return procedure for AD9571ACPZPEC-RL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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