Vendor: Analog Bits Inc. Category: PLL

FracN/SSCG PLL on GLOBALFOUNDRIES 12LP+

The low power Fractional-N / SSCG PLL addresses power sensitive designs required for IOT, mobile and other low power applications…

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GlobalFoundries 12nm LP View all specifications

Overview

The low power Fractional-N / SSCG PLL addresses power sensitive designs required for IOT, mobile and other low power applications needing non-integer clock multiplication, programmable clock synthesis, clock tracking or fine tuning on-the-fly, and Spread Spectrum clock generation. The PLL is designed for digital logic processes and use robust design techniques to work in noisy SoC environments, such as high speed communication to low power consumer to memory interfaces.

The programmable Fractional-N divider allows the PLL to lock to an incoming clock source and produce an output clock with a non-integer multiplication factor. The generated clock can be locked to the input source yet adjusted to a fine-degree of precision, and may be adjusted on-the-fly to maintain a relatively drifting local clock need. The updatable programmable fractional feedback divider is provided for this purpose. “On the fly” capability means the frequency transition and re-obtaining lock process for small frequency adjustment is glitch free and contains limited frequency over/undershoot.

Furthermore, itis a requirement by the FCC and equivalent international bodies that electronic devices including game-consoles, PCs, and high speed compute servers, limit Electromagnetic Interference (EMI) when they operate. The Spread Spectrum function of the PLL is capable of generating precise clock spreads (using a triangular modulation profile) that help reduce EMI. Programmable options allow the user to control the degree of spread in fine steps of modulation frequency and depth.

The PLL macro is implemented in Analog Bits’ proprietary architecture that uses core and 1.8V IO devices. In order to minimize noise coupling and maximize ease of use, the PLL incorporates a proprietary ESD structure, which is proven in several generations of processes. Eliminating band-gaps and integrating all on-chip components such as capacitors and ESD structures, helps the jitter performance significantly and reduces stand-by and operational power.

PLL Operational Range Description Symbol Min Typ Max Units Input Frequency FREF 10 300 MHz Post-Divide Reference Frequency (Integer mode) FPFD 10 200 MHz Post-Divide Reference Frequency (Fractional mode) FPFD 5 7.5 MHz VCO Frequency FVCO 1200 6000 MHz Output Frequency FOUT 20 3000 MHz Output Duty Cycle tDO 48 52 % Modulation Frequency Range 6.11 234 kHz Modulation Depth Range (down-spread) -4 0 % Modulation Depth Range (center-spread) -2 2 % Modulation Depth Control (step size) 0.25 1.18 % Area A 0.024 sq. mm Total Power IDD 6 mA Operational Voltage (Digital) VDIG 0.72 0.8 0.88 V Operational Voltage (Analog) VANA 1.62 1.8 1.98 V Operational Temperature TOP -40 25 125 C

Key features

  • Electrically Programmable PLL with Fractional-N divider and Spread Spectrum Clock Generation
  • Wide Ranges of Input and Output Frequency for diverse clocking needs
  • Ability to generate precise system clocks synchronized to track remote sources
  • Very fine precision: near 1 part per billion resolution
  • Fully integrated 32-bit datapath (8-bit integer plus 24-bit fractional)
  • Low power consumption
  • Small area footprint
  • Spread Spectrum tracking capability
  • Requires no additional on-chip components or band-gaps, minimizing power consumption

Block Diagram

FracN/SSCG PLL on GLOBALFOUNDRIES 12LP+ block diagram

Silicon Options

Foundry Node Process Maturity
GlobalFoundries 12nm LP —

Specifications

Identity

Part Number
FracN/SSCG PLL on GLOBALFOUNDRIES 12LP+
Vendor
Analog Bits Inc.
Type
Silicon IP

Files

Product Sheet Download

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Provider

Contact Analog Bits Inc.

Learn more about PLL IP core

Creating a Frequency Plan for a System using a PLL

How do you ensure that every part of a system receives the clock it needs—without wasting power or sacrificing performance? The answer lies in creating a well-structured frequency plan built around a PLL.

Specifying a PLL Part 3: Jitter Budgeting for Synthesis

This white paper is aimed at system architects and physical implementation leaders working on the design of SoCs. It can be confusing to understand the impact of different jitter sources and how to calculate a jitter budget when specifying a digital system. This white paper explains how jitter changes the period of a clock and how to ensure that jitter has correctly been accounted for in the calculations for timing closure.

Specifying a PLL Part 2: Jitter Basics

This article explains a some of the key terminology and parameters commonly used to describe jitter. It will also help clarify the most important parameters for a some PLL applications, allowing the designer to better understand what is required from a PLL.

Specifying a PLL Part 1: Calculating PLL Clock Spur Requirements from ADC or DAC SFDR

In high end RF systems, such as 5G radios, the requirements are so stringent that the source of this strongest unwanted tone can be the PLL. This article outlines how spurs in the input clock to the ADC or DAC may limit the SFDR. This in turn will set the requirements for the spurs for the input clock (from a PLL), in order to achieve a specific SFDR.

Achieving Groundbreaking Performance with a Digital PLL

This article compares analog, first-generation digital, and second-generation digital PLLs. It evaluates which type of PLL may be best in which situation. It further discloses a roadmap into other application areas, including general purpose / logic clocking, and regular low-jitter PLLs.

Frequently asked questions about PLL IP cores

What is FracN/SSCG PLL on GLOBALFOUNDRIES 12LP+?

FracN/SSCG PLL on GLOBALFOUNDRIES 12LP+ is a PLL IP core from Analog Bits Inc. listed on Semi IP Hub. It is listed with support for globalfoundries.

How should engineers evaluate this PLL?

Engineers should review the overview, key features, supported foundries and nodes, maturity, deliverables, and provider information before shortlisting this PLL IP.

Can this semiconductor IP be compared with similar products?

Yes. Buyers can compare this product with similar semiconductor IP cores or IP families based on category, provider, process options, and structured technical specifications.

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