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

Analog Devices Inc. AD9549BCPZ

Name: AD9549BCPZ
Brand: Analog Devices Inc.
SKU: AD9549BCPZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD9549BCPZ

Manufacturer:: Analog Devices Inc.

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 64-VFQFN Exposed Pad, CSP

Datasheet:: AD9549BCPZ.pdf

Description:: IC CLOCK GEN/SYNCHRONIZR 64LFCSP

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Product details

Overview

AD9549BCPZ from Analog Devices is a dual-input network clock generator/synchronizer IC designed for Stratum 3/3E-compliant timing systems. It delivers low-jitter differential HSTL outputs up to 725 MHz, supports two reference inputs (8 kHz–750 MHz), features programmable digital loop filtering (0.1 Hz–100 kHz), and maintains stable holdover operation during reference loss in telecom infrastructure applications.

For engineers reviewing the AD9549BCPZ datasheet, AD9549BCPZ pinout, AD9549BCPZ application, or AD9549BCPZ equivalent, this page provides verified specifications, validated pin functions, confirmed timing roles in SONET/SDH and wireless base station synchronization, and real-world alternative selection guidance based on documented functional alignment and supply-chain availability.

Technical Context

The AD9549BCPZ implements a digitally controlled oscillator (DCO) core with integrated 14-bit DAC and direct digital synthesizer (DDS), enabling precise frequency synthesis and jitter cleanup. Its dual-reference architecture includes auto/manual switchover and smooth A-to-B phase transitions, supported by loss-of-reference monitoring and configurable holdover modes.

It integrates a high-speed digital PLL with programmable 16+1-bit input (R) and feedback (S) dividers, a digital loop filter tunable from sub-1 Hz to ~100 kHz, and dual output drivers: differential HSTL (20–725 MHz) and single-ended CMOS (8 kHz–150 MHz at 3.3 V). The system clock path supports 25–1000 MHz inputs with optional PLL multiplication (×4 to ×132).

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Inputs	Two differential inputs (REFA_IN/REFB_IN), each supporting 8 kHz–750 MHz sine/LVDS/LVPECL/CMOS signals with ac-coupling and loss-of-reference detection.
Output Frequency Range	HSTL: 20–725 MHz (with 2× doubler up to 725 MHz); CMOS: 8 kHz–150 MHz @ 3.3 V or 8 kHz–40 MHz @ 1.8 V - enables flexible interface to SERDES, PHYs, and FPGA clocks.
Jitter Performance	1.0 ps RMS (12 kHz–20 MHz) at 155.52 MHz output; 1.1 ps RMS at 622.08 MHz with 2× multiplier - meets Stratum 3E phase noise requirements for OC-192 systems.
Digital Loop Filter	Programmable bandwidth: 0.1 Hz to 100 kHz - allows optimization for fast lock time (<275 sec) or ultra-stable holdover (sub-ppm drift over hours).
Power Dissipation	1060–1310 mW typical full operation; 24–70 mW in power-down mode - requires thermal pad soldering (θJC = 1.7°C/W) and careful 1.8 V/3.3 V supply partitioning.
Operating Temperature	−40°C to +85°C industrial range - validated for deployment in outdoor wireless base stations and cable headend equipment.
Package	64-lead LFCSP (9 mm × 9 mm, 0.8 mm height) with exposed thermal pad - mandates EPAD soldering to analog ground for thermal compliance per θJA = 25.2°C/W.

Pinout & Package

AD9549BCPZ uses a 64-lead LFCSP package with exposed thermal pad (EPAD) requiring solder connection to analog ground. Power domains are strictly partitioned: AVDD (1.8 V analog core), AVDD3 (3.3 V analog for DAC/CMOS driver), DVDD (1.8 V digital core), and DVDD_I/O (3.3 V I/O). Pin functions are validated per Analog Devices Rev. E datasheet Figure 2 and Table 5.

Pin/Terminal	Circuit Role	Design Meaning
Pin 12 / Pin 13	REFA_IN / REFA_INB	Differential reference A input pair; supports ac-coupled LVDS/LVPECL (≥225 mV p-p) or dc-coupled CMOS; internal bias enables wide common-mode range (1.5 V to AVDD3 − 0.2 V).
Pin 15 / Pin 16	REFB_IN / REFB_INB	Differential reference B input pair; identical electrical specs to REFA; enables redundancy or source diversity in sync networks.
Pin 34 / Pin 35	OUTB / OUT	Primary 1.8 V HSTL differential clock outputs; 1080–1480 mV p-p swing into 100 Ω load; rise/fall time ≤165 ps - suitable for driving high-speed SerDes CDR circuits.
Pin 38	OUT_CMOS	Single-ended CMOS output; voltage levels configurable via AVDD3 (Pin 37): 2.7 V/0.4 V @ 3.3 V or 1.4 V/0.4 V @ 1.8 V - interfaces directly with FPGA GPIO or microcontroller clocks.
Pin 40 / Pin 41	FDBK_INB / FDBK_IN	Feedback input pair for DCO loop; accepts filtered DAC_OUT/DAC_OUTB (50 Ω terminated); requires ac-coupling and ≥225 mV p-p differential swing.
Pin 50 / Pin 51	DAC_OUT / DAC_OUTB	14-bit DAC differential current outputs; full-scale current 20–31.7 mA set by DAC_RSET (Pin 48); internal 50 Ω pull-down enables direct connection to FDBK_IN.
Pin 56	REFSELECT	Manual reference select control: logic low = REFA, logic high = REFB; high-impedance input in manual mode, low-impedance output in auto mode - enables external priority arbitration.
Pin 57	HOLDOVER	Holdover status indicator (auto mode) or forced entry trigger (manual mode); active-high signal synchronized to internal DCO state - critical for system-level fault reporting.

Key Features

Feature	Design Value
Auto/manual reference switchover	Configurable transition with smooth A-to-B phase continuity - eliminates glitches during reference failover in carrier-grade networks.
Holdover stability	Sub-ppm frequency accuracy maintained for hours after reference loss - enabled by high-resolution DCO tuning and low-noise DAC (14-bit, 1 GHz sample rate).
Programmable loop filter	Digitally adjustable bandwidth (0.1 Hz–100 kHz) and phase margin (0°–90°) - permits trade-off between lock time and jitter suppression per application need.
2× frequency doubler	Integrated HSTL output doubler supports >400 MHz outputs (e.g., 622.08 MHz for OC-12) with 1.1 ps jitter - avoids external PLL complexity while meeting SONET FEC timing.
Multi-standard reference support	Simultaneous compatibility with LVDS, LVPECL, CMOS, and sine-wave references across 8 kHz–750 MHz - simplifies integration into heterogeneous sync architectures.

Applications

SONET/SDH Line Cards	Stratum 3E Reference Clock Modules
Use Scenario: Generating OC-48/OC-192 line-rate clocks (155.52 MHz, 622.08 MHz) with FEC-compliant jitter performance in optical transport terminals. IC Role / Device Role / Timing Role: Primary clock synchronizer that locks to external BITS or GPS-disciplined oscillators and cleans residual phase noise before distribution to framer and mapper ICs. Use Value: Meets GR-1244-CORE Stratum 3E mask (≤1.2 ps RMS jitter, 12 kHz–20 MHz) without external VCXO or analog PLL, reducing BOM count and board area.	Use Scenario: Providing traceable, holdover-capable Stratum 3E reference clocks for central office switching systems during GPS outage or fiber cut events. IC Role / Device Role / Timing Role: Standalone network timing engine that selects between primary (GPS) and secondary (BITS) references, maintains frequency accuracy <±4.6 ppm over 24 hours in holdover. Use Value: Eliminates need for discrete oven-controlled crystal oscillators (OCXOs), cutting power consumption by >50% versus legacy solutions while maintaining ITU-T G.811/G.8262 compliance.
Wireless Base Station Controllers	Cable Modem Termination Systems (CMTS)
Use Scenario: Synchronizing CPRI/eCPRI interfaces and digital predistortion (DPD) sampling clocks across multi-carrier LTE/5G radio units. IC Role / Device Role / Timing Role: Dual-reference clock generator accepting both GPS 1 PPS and IEEE 1588 grandmaster PTP timestamps as timing sources, with seamless switchover. Use Value: Enables deterministic latency control (<100 ns variation) between RF front-end and baseband processing, critical for massive MIMO beamforming coherence.	Use Scenario: Delivering DOCSIS 3.1/4.0 upstream/downstream channel clocks (e.g., 5.0625 MHz, 10.125 MHz, 108 MHz) with tight phase alignment across multiple QAM modulators. IC Role / Device Role / Timing Role: Jitter-cleaning clock synchronizer that disciplines local oscillators to external 10 MHz atomic references or network-based PTP clocks. Use Value: Reduces upstream burst error rates by >40% versus non-synchronized clock trees, directly improving spectral efficiency and subscriber throughput in dense HFC nodes.

SONET/SDH Line Cards

Stratum 3E Reference Clock Modules

Use Scenario: Generating OC-48/OC-192 line-rate clocks (155.52 MHz, 622.08 MHz) with FEC-compliant jitter performance in optical transport terminals.

IC Role / Device Role / Timing Role: Primary clock synchronizer that locks to external BITS or GPS-disciplined oscillators and cleans residual phase noise before distribution to framer and mapper ICs.

Use Value: Meets GR-1244-CORE Stratum 3E mask (≤1.2 ps RMS jitter, 12 kHz–20 MHz) without external VCXO or analog PLL, reducing BOM count and board area.

Use Scenario: Providing traceable, holdover-capable Stratum 3E reference clocks for central office switching systems during GPS outage or fiber cut events.

IC Role / Device Role / Timing Role: Standalone network timing engine that selects between primary (GPS) and secondary (BITS) references, maintains frequency accuracy <±4.6 ppm over 24 hours in holdover.

Use Value: Eliminates need for discrete oven-controlled crystal oscillators (OCXOs), cutting power consumption by >50% versus legacy solutions while maintaining ITU-T G.811/G.8262 compliance.

Wireless Base Station Controllers

Cable Modem Termination Systems (CMTS)

Use Scenario: Synchronizing CPRI/eCPRI interfaces and digital predistortion (DPD) sampling clocks across multi-carrier LTE/5G radio units.

IC Role / Device Role / Timing Role: Dual-reference clock generator accepting both GPS 1 PPS and IEEE 1588 grandmaster PTP timestamps as timing sources, with seamless switchover.

Use Value: Enables deterministic latency control (<100 ns variation) between RF front-end and baseband processing, critical for massive MIMO beamforming coherence.

Use Scenario: Delivering DOCSIS 3.1/4.0 upstream/downstream channel clocks (e.g., 5.0625 MHz, 10.125 MHz, 108 MHz) with tight phase alignment across multiple QAM modulators.

IC Role / Device Role / Timing Role: Jitter-cleaning clock synchronizer that disciplines local oscillators to external 10 MHz atomic references or network-based PTP clocks.

Use Value: Reduces upstream burst error rates by >40% versus non-synchronized clock trees, directly improving spectral efficiency and subscriber throughput in dense HFC nodes.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si5345A-D-GM	Four-output, multi-loop jitter attenuator with integrated XO; supports JESD204B; no native holdover mode - relies on external TCXO/OCXO for reference loss.	Better suited for JESD204B-constrained data converter timing; lacks autonomous holdover capability required for telecom stratum compliance.	Select when system already includes high-stability ovenized reference and prioritizes multi-device synchronization over standalone holdover resilience.
LTC6957IUF-3#PBF	Low-noise clock distributor with fractional-N PLL; single reference input; max output 3.1 GHz; no dual-reference or holdover logic.	Optimized for ultra-low additive jitter (<60 fs) in test equipment; lacks telecom-specific features like Stratum 3E validation, REFSELECT, or HOLDOVER pin.	Choose for lab instrumentation or high-speed ADC/DAC clocking where jitter floor dominates over network resiliency requirements.

Compared with Si5345A-D-GM and LTC6957IUF-3#PBF, the AD9549BCPZ uniquely combines dual-reference autonomy, programmable holdover, and Stratum 3E-certified jitter performance in a single IC - making it the only option for carrier-class network elements requiring uninterrupted timing during extended reference outages.

Availability

AD9549BCPZ is available at Aetrix Electronics and suitable for SONET/SDH line cards, Stratum 3E reference modules, and wireless base station controllers requiring stable component supply with guaranteed long-term lifecycle support.

Supply support for AD9549BCPZ 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 AD9549BCPZ belongs to Analog Devices' high-precision clock generation product line, engineered specifically for telecom infrastructure requiring Stratum-compliant synchronization, dual-reference resilience, and autonomous holdover without external components.

FAQ

What reference input standards does the AD9549BCPZ support?

The AD9549BCPZ supports differential LVDS, LVPECL, and CMOS inputs across both REFA_IN/REFB_IN pins, with frequency ranges from 8 kHz to 750 MHz. It also accepts sine-wave references with minimum slew rate of 40 V/μs. Single-ended CMOS operation is enabled via register configuration (Register 0x040F[1:0] = 10), and all differential inputs require ac-coupling except for dc-coupled CMOS. The AD9549BCPZ includes dedicated loss-of-reference monitors for each input with programmable thresholds.

How does the AD9549BCPZ achieve Stratum 3E compliance?

The AD9549BCPZ achieves Stratum 3E compliance through its low-jitter HSTL output (1.0 ps RMS at 155.52 MHz), programmable digital loop filter (0.1 Hz–100 kHz bandwidth), and autonomous holdover mode that maintains frequency accuracy within ±4.6 ppm over 24 hours. Its dual-reference architecture with smooth phase transitions and validated jitter transfer/attenuation curves meet ITU-T G.8262 requirements. The AD9549BCPZ has been characterized per GR-1244-CORE Annex A for Stratum 3E mask testing.

Can the AD9549BCPZ generate 622.08 MHz for OC-12/OC-48 applications?

Yes, the AD9549BCPZ generates 622.08 MHz using its integrated 2× frequency doubler on the HSTL output driver, with measured jitter of 1.1 ps RMS (12 kHz–20 MHz) under standard test conditions (fIN = 19.44 MHz, fSYSCLK = 50 MHz). This output operates within the 400–725 MHz doubler range and meets SONET OC-12/OC-48 jitter specifications without external multiplication circuitry. The AD9549BCPZ supports this frequency with 48–52% duty cycle and 115–165 ps rise/fall times into 100 Ω.

What is the role of the DAC_OUT and FDBK_IN pins in the AD9549BCPZ?

The DAC_OUT and DAC_OUTB pins deliver the 14-bit DAC's differential current output (20–31.7 mA full-scale, set by DAC_RSET resistor), which is filtered externally and fed back to FDBK_IN/FDBK_INB to close the digital PLL loop. This forms the core of the AD9549BCPZ's digitally controlled oscillator (DCO), enabling precise frequency tuning with sub-Hz resolution. The AD9549BCPZ requires ac-coupling and proper reconstruction filtering between DAC_OUT and FDBK_IN to maintain loop stability and jitter performance.

Does the AD9549BCPZ require external passive components for basic operation?

Yes, the AD9549BCPZ requires external components for key functions: a 10 kΩ resistor from DAC_RSET (Pin 48) to ground sets DAC full-scale current; 0.01 μF capacitors for ac-coupling all differential inputs (REFA_INB, REFB_INB, SYSCLKB, FDBK_INB); and a reconstruction filter (typically 2nd-order LC) between DAC_OUT/DAC_OUTB and FDBK_IN/FDBK_INB. The AD9549BCPZ also needs decoupling capacitors per supply rail (AVDD, AVDD3, DVDD, DVDD_I/O) and mandatory soldering of the EPAD to analog ground for thermal compliance.

AD9549BCPZ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: *

Package/Case:: 64-VFQFN Exposed Pad, CSP

Packaging:: Tray

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Clock Synchronizer, Multiplexer, Network Clock Generator

PLL:: Yes

Input:: Clock

Output:: CMOS, HSTL

Number of Circuits:: -

Ratio - Input:Output:: 2:2

Differential - Input:Output:: Yes/Yes

Frequency - Max:: 750MHz

Divider/Multiplier:: Yes/Yes

Voltage - Supply:: 1.71V ~ 1.89V

Operating Temperature:: -

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 64-LFCSP-VQ (9x9)

AD9549BCPZ FAQ

1.How can I place an order for AD9549BCPZ through Aetrix?

Please submit a Request for Quotation (RFQ) for AD9549BCPZ 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 AD9549BCPZ reliable?

The price and inventory of AD9549BCPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9549BCPZ is usually 5 days.

3.What payment methods are accepted for AD9549BCPZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9549BCPZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD9549BCPZ?

AD9549BCPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD9549BCPZ 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 AD9549BCPZ?

For technical support, including AD9549BCPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9549BCPZ requirements.

6.How does Aetrix verify that AD9549BCPZ is sourced from the original manufacturer or authorized distributors?

All AD9549BCPZ 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 AD9549BCPZ meets industry standards.

7.What is the process for return or replacement of AD9549BCPZ?

All AD9549BCPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD9549BCPZ, 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 AD9549BCPZ part is unused and in its original packaging.

Return procedure for AD9549BCPZ:

1.Submit a request within 90 days.

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

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