Analog Devices Inc. AD9574BCPZ-REEL7

Overview

AD9574BCPZ-REEL7 from Analog Devices is a low-jitter Ethernet/Gigabit Ethernet clock generator IC featuring an integrated integer-N PLL, VCO, and seven configurable differential/CMOS clock outputs (OUT0–OUT6). It supports 19.44 MHz or 25 MHz reference inputs, delivers sub-0.25 ps rms jitter at 156.25 MHz (10 kHz–10 MHz), and operates from a single 3.3 V supply in a 7 mm × 7 mm 48-lead LFCSP package for line card timing applications.

For engineers reviewing the AD9574BCPZ-REEL7 datasheet, AD9574BCPZ-REEL7 pinout, AD9574BCPZ-REEL7 application, or AD9574BCPZ-REEL7 equivalent, key selection criteria include reference switchover capability, output format flexibility (HSTL/LVDS/HCSL/CMOS), integrated loop filter (single external capacitor), PPRx pin-strapped configuration, and −40°C to +85°C industrial temperature operation.

Technical Context

The AD9574BCPZ-REEL7 implements a dedicated integer-N PLL architecture with low-noise PFD, precision charge pump, partially integrated loop filter (LF pin requires one external capacitor), and low-phase-noise VCO. Its frequency translation logic is fully controlled by seven strapping pins (PPR0–PPR6), enabling preset output frequencies without serial programming.

It features dual redundant reference inputs (REF0/REF1) with automatic switchover, reference monitoring via MCLK input (8 kHz–38.88 MHz), and independent output drivers per channel-supporting HSTL (OUT0–OUT5), LVDS (OUT4–OUT6), HCSL (OUT4–OUT5), and 1.8 V/3.3 V CMOS (OUT0/OUT1/OUT6)-with static and dynamic specifications validated across −40°C to +85°C.

Key Specifications

Pinout & Package

AD9574BCPZ-REEL7 is housed in a 48-lead, 7 mm × 7 mm lead-frame chip-scale package (LFCSP) with exposed thermal pad. Pin functions are defined by strapping (PPRx) and status/control roles, with all power domains (VDD_REF0, VDD_PLL, VDD_OUTx, etc.) separately decoupled per datasheet layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-A-GM and ICS85310AGI-01LFT, the AD9574BCPZ-REEL7 uniquely combines pin-strapped preset frequencies, dual-reference switchover, and ultra-low jitter in a single 3.3 V supply - making it optimal for cost-sensitive, high-reliability Ethernet line cards where firmware-free operation is critical.

Availability

AD9574BCPZ-REEL7 is available at Aetrix Electronics and suitable for Ethernet line cards, SATA/PCIe timing subsystems, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD9574BCPZ-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, serving industrial, automotive, communications, and healthcare markets.

The AD9574BCPZ-REEL7 belongs to Analog Devices' precision clock generation product line, engineered specifically for Ethernet, telecom, and data center timing applications demanding ultra-low jitter, reference redundancy, and simplified system-level clock tree design.

FAQ

What reference frequencies does the AD9574BCPZ-REEL7 support?

The AD9574BCPZ-REEL7 supports two primary reference inputs: 19.44 MHz (SONET/SDH compliant) and 25 MHz (Ethernet/PCIe compliant), both accepted in differential (LVDS/HCSL) or single-ended CMOS formats. The device uses these references to generate 19 preset output frequencies - including 156.25 MHz, 312.5 MHz, and 125 MHz - via internal divider settings controlled by PPRx strapping pins. No external frequency synthesis is required.

How does the AD9574BCPZ-REEL7 handle reference clock failure?

The AD9574BCPZ-REEL7 implements automatic reference switchover between REF0 and REF1 inputs upon loss-of-signal or frequency deviation beyond threshold. Switchover causes ≤220 ps instantaneous phase disturbance and ≤500 ppm peak frequency disturbance on PLL outputs, preserving system timing integrity. The REF_ACT pin indicates the active source, while REF_SW pulses during transition. Manual override is possible via the REF_SEL pin.

Can the AD9574BCPZ-REEL7 generate 312.5 MHz output?

Yes, the AD9574BCPZ-REEL7 can generate 312.5 MHz output - specifically on OUT4 or OUT5 channels - when configured with a 25 MHz reference input and PPR1 strapping set to enable the ×2 PLL input multiplier. This output is supported in HSTL, HCSL, and LVDS formats, with measured jitter as low as 0.072 ps rms (1.875 MHz–20 MHz integration band) in HCSL mode, meeting IEEE 802.3ba CAUI requirements.

What output voltage formats does the AD9574BCPZ-REEL7 support?

The AD9574BCPZ-REEL7 supports five output drive formats across its seven channels: HSTL (OUT0–OUT5), LVDS (OUT4–OUT6), HCSL (OUT4–OUT5), 1.8 V CMOS (OUT6), and 3.3 V CMOS (OUT0, OUT1, OUT6). Each format has validated static and dynamic specifications - e.g., HSTL delivers 745–1235 mV differential swing, while 3.3 V CMOS provides VOH ≥ VDD − 0.5 V at 10 mA load - ensuring direct interface to FPGAs, ASICs, and PHYs without level-shifting.

Is an external loop filter required for the AD9574BCPZ-REEL7?

No, the AD9574BCPZ-REEL7 integrates the majority of the PLL loop filter circuitry internally. Only a single external capacitor connected to the LF pin is required to complete the loop filter - eliminating the need for discrete resistors, capacitors, or op-amps. This simplifies PCB layout, reduces component count, and avoids tuning complexity associated with traditional passive loop filters, while maintaining optimal jitter performance and stability across temperature and voltage.