Vendor: Analog Bits Inc. Category: PLL

Low Power Frac-N on TSMC CLN22ULL

A programmable on-the-fly Fractional-N PLL is required to lock to an incoming clock source and produce an output clock.

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TSMC 22nm ULL View all specifications

Overview

A programmable on-the-fly Fractional-N PLL is required to lock to an incoming clock source and produce an output clock. The generated clock needs to be locked to the input source but maintain a high-degree of precision, hence an on-the-fly programmable fractional feedback divider is required (“on the fly” meaning the frequency transition and re-obtaining lock process for small frequency adjustment isglitch free and contains limited frequency over/undershoot).

The Fractional-N PLL macro is implemented in Analog Bits’ proprietary architecture that uses core and IO devices. The PLL resides inside the IO ring that includes two analog power supply pads, occupying no core area. 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 power. The Fractional-N PLL macro fits into any standard IO pad pitch and can be implemented in staggered and in-line IO configurations.

PLL Operational Range Description Symbol Min Typ Max Units Input Frequency FREF 10 300 MHz Post-Divide Reference frequency FPFD 5 7.5 MHz VCO Frequency FVCO 4000 MHz Output Frequency FOUT 20 2000 MHz Output Duty Cycle tDO 48 52 % Total area of macro (excluding bond pad area) A 0.013 sq. mm May vary depending on size of IO slots Chip core area requirement CA 0 sq. mm Total Power IDD 6 mA Operational Voltage (Digital) VDIG 0.81 0.9 0.99 V Operational Voltage (Analog) VANA 1.62 1.8 1.98 V Operational Temperature TOP -40C 25 125 C Table 1: PLL Operational Range

Key features

  • Electrically Programmable PLL for multiple applications
  • 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)
  • Implemented with Analog Bits’ proprietary architecture
  • Fully integrated inside industry standard or other customized IO ring
  • Occupies zero core area
  • Low power consumption
  • Spread Spectrum tracking capability
  • Requires no additional on-chip components or band-gaps, minimizing power consumption

Silicon Options

Foundry Node Process Maturity
TSMC 22nm ULL —

Specifications

Identity

Part Number
Low Power Frac-N on TSMC CLN22ULL
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

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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 Low Power Frac-N on TSMC CLN22ULL?

Low Power Frac-N on TSMC CLN22ULL is a PLL IP core from Analog Bits Inc. listed on Semi IP Hub. It is listed with support for tsmc.

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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