Analog Devices Inc. AD9578BCPZ-REEL7

Overview

AD9578BCPZ-REEL7 from Analog Devices is a dual PLL precision clock synthesizer for jitter attenuation and asynchronous clocking in high-performance telecom, networking, and SERDES systems. It delivers four independently programmable outputs (up to 919 MHz), <410 fs rms jitter (12 kHz–20 MHz), 0.1 ppb frequency resolution, and supports LVPECL/LVDS/HCSL/LVCMOS output formats using 20–60 MHz reference inputs.

For engineers reviewing the AD9578BCPZ-REEL7 datasheet, AD9578BCPZ-REEL7 pinout, AD9578BCPZ-REEL7 application, or AD9578BCPZ-REEL7 equivalent, key selection considerations include dual-PLL architecture with integer/fractional synthesis modes, on-the-fly SPI reconfiguration (up to 50 MHz), ultralow jitter performance across multiple output standards, and factory-programmed power-on defaults enabling rapid integration into FPGA-based timing subsystems.

Technical Context

The AD9578BCPZ-REEL7 integrates two independent fractional-N PLLs-each with configurable VCO, charge pump, and dual output dividers-enabling simultaneous generation of four distinct output frequencies from one or two reference sources. Its architecture supports both integer and fractional synthesis, with NCO-based dynamic frequency pulling for digital PLL implementations.

Reference inputs accept LVPECL, LVDS, 1.8 V LVCMOS, or fundamental-mode AT-cut crystals (22–54 MHz); output buffers are individually configurable per channel with dedicated VDDOx supplies and selectable logic families (LVPECL/LVDS/HCSL/LVCMOS), ensuring interoperability across mixed-signal system interfaces.

Key Specifications

Pinout & Package

The AD9578BCPZ-REEL7 is housed in a 48-lead, 7 mm × 7 mm LFCSP package with exposed thermal pad. Pin assignments support dual reference inputs (XO1–XO4), four differential/single-ended clock outputs (OUT1–OUT4), dedicated output supply pins (VDDO1–VDDO4), analog supply (VDDA), SPI interface (CS, SCK, SDI, SDO/LOL), and control logic (PD1, OEREF, OE1–OE4).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-PLL clock synthesizer applications.

Compared with LMK04832RHAR and Si5341-B-GM, the AD9578BCPZ-REEL7 offers the lowest published rms jitter (<300 fs integer mode) in its class, smallest 7 mm × 7 mm footprint, and direct FPGA-compatible NCO control-making it optimal for space-constrained, jitter-critical telecom and broadcast platforms.

Availability

AD9578BCPZ-REEL7 is available at Aetrix Electronics and suitable for optical transport (OTN), broadcast video (3G-SDI), wireless infrastructure (CPRI), industrial timing (IEEE 1588), and high-speed SERDES applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AD9578BCPZ-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, headquartered in Wilmington, MA.

The AD9578BCPZ-REEL7 belongs to Analog Devices' precision clock synthesis product line, engineered specifically for jitter-critical infrastructure applications including telecom synchronization, broadcast video timing, and IEEE 1588 boundary clocks.

FAQ

What is the minimum output frequency supported by the AD9578BCPZ-REEL7?

The AD9578BCPZ-REEL7 supports output frequencies as low as 11.8 MHz across all output formats (LVPECL, LVDS, HCSL, LVCMOS). This lower bound applies regardless of reference input source or synthesis mode (integer or fractional), enabling use in legacy telecom interfaces and low-frequency control clocking scenarios.

Does the AD9578BCPZ-REEL7 support both integer and fractional-N PLL modes?

Yes, the AD9578BCPZ-REEL7 supports both integer and fractional-N synthesis modes. Integer mode achieves <300 fs rms jitter (12 kHz–20 MHz) with 25 MHz reference; fractional mode provides greater frequency flexibility at <405 fs typical jitter-both modes are configurable per PLL via SPI registers.

Can the AD9578BCPZ-REEL7 generate four different output frequencies simultaneously?

Yes, the AD9578BCPZ-REEL7 can generate four independent output frequencies simultaneously-one pair from PLL1 (OUT1/OUT2) and one pair from PLL2 (OUT3/OUT4). Each output has its own divider, format, and VDDO supply, enabling true multirate operation such as 622.08 MHz (OTN) + 156.25 MHz (Ethernet) + 74.25 MHz (SDI) + 10 MHz (reference).

What reference input types does the AD9578BCPZ-REEL7 accept?

The AD9578BCPZ-REEL7 accepts four reference input types: fundamental-mode AT-cut crystals (22–54 MHz), LVPECL, LVDS, and 1.8 V LVCMOS clock signals (20–60 MHz). XO1/XO3 are optimized for crystals; XO2/XO4 accept differential or single-ended LVCMOS-no external termination components required.

Is the AD9578BCPZ-REEL7 pin-compatible with other devices in the AD957x family?

No, the AD9578BCPZ-REEL7 is not pin-compatible with earlier AD957x variants (e.g., AD9577, AD9576). Its 48-lead LFCSP pinout is unique to the AD9578, with dedicated VDDOx supplies and expanded SPI functionality. Migration requires PCB redesign and firmware adaptation.