Clock Recovery Unit

Product Specifications

Technical details and manufacturing context for Clock Recovery Unit

Definition

The Clock Recovery Unit is a critical component within the PHY (Physical Layer) Interface that synchronizes the receiver's internal clock with the transmitter's clock by analyzing the incoming data signal's transitions. It ensures accurate data sampling and recovery by compensating for timing variations, jitter, and phase differences between transmitted and received signals. This unit is typically implemented using a phase-locked loop (PLL) or delay-locked loop (DLL) architecture. It detects transitions in the incoming data stream, compares the phase difference with a local oscillator, and generates a synchronized clock signal that aligns with the data's timing characteristics for precise sampling. The unit supports input data rates from 1 to 40 Gbps and provides an output clock frequency matching the data rate. It offers jitter tolerance of 0.6 to 1.0 UI and jitter generation of ≤0.1 UI peak-to-peak at a bit error rate of 10^12. Supply voltage options range from 1.8 to 3.3 V, with power consumption between 0.5 and 2.5 W depending on data rate and features. The operating temperature range is -40 to 85 °C for industrial grade. Input sensitivity is 10 to 100 mV minimum differential swing. Lock time from power-on to stable clock is ≤10 ms. The unit is available in surface-mount packages QFN-32 to QFN-48, RoHS compliant. ESD rating is ≥2 kV (HBM model) per IEC 61000-4-2. Materials include silicon semiconductor substrate, copper interconnects, and dielectric insulation. These specifications are directory reference ranges; verify model-specific values with the manufacturer.

Working Principle

The Clock Recovery Unit operates by first detecting transitions in the incoming data stream. It then compares the phase of these transitions with a local oscillator using a phase-locked loop (PLL) or delay-locked loop (DLL). The loop adjusts the oscillator's frequency and phase to align with the data's timing, generating a recovered clock signal. This clock is used to sample the data accurately, compensating for jitter and phase differences. The unit locks within 10 ms and maintains synchronization across the specified data rate range.

Common Materials

Silicon (semiconductor substrate), Copper (interconnects), Dielectric materials (insulation)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Input Data Rate	1–40 Gbps	Supports common serial data rates
Output Clock Frequency	1–40 GHz	Matches data rate for retiming
Jitter Tolerance	0.6–1.0 UI	Compliant with telecom masks
Jitter Generation	≤0.1 UI	Peak-to-peak at 10^12 BER
Supply Voltage	1.8–3.3 V	Single or dual supply options
Power Consumption	0.5–2.5 W	Depends on data rate and features
Operating Temperature	-40–85 °C	Industrial grade
Input Sensitivity	10–100 mV	Minimum differential input swing
Lock Time	≤10 ms	From power-on to stable clock
Package Type	QFN-32–QFN-48	Surface mount, RoHS compliant
ESD Rating	≥2 kV	HBM modelIEC 61000-4-2

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Phase Detector
Compares the phase difference between the incoming data signal and the local oscillator output

Material: Semiconductor (CMOS/BiCMOS)
Voltage-Controlled Oscillator
Generates the clock signal with frequency controlled by the phase detector output

Material: Semiconductor with LC tank or ring oscillator structure
Loop Filter
Filters and stabilizes the control voltage to the VCO, determining the PLL's dynamic response

Material: Passive components (resistors, capacitors) integrated on silicon

Applied To / Applications

This component is essential for the following industrial systems and equipment:

PHY Interface

View system integration details

Manufacturers of Clock Recovery Unit

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Semight Instruments

Jiangsu, CN

Also makes: Oscilloscope

Listed on the company's own website · profile compiled by CNFX from public sources

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Frequently Asked Questions

What is the typical input data rate range for this Clock Recovery Unit?

The directory lists a reference range of 1 to 40 Gbps. Actual supported rates depend on the specific model and configuration; always confirm with the manufacturer.

What is the jitter tolerance specification?

The jitter tolerance is listed as 0.6 to 1.0 UI, compliant with telecom masks. This indicates the unit's ability to handle input jitter without losing lock. Verify the exact value for your application.

What package options are available?

The unit is offered in surface-mount packages ranging from QFN-32 to QFN-48, RoHS compliant. The specific package depends on the model and feature set.

What is the ESD rating?

The ESD rating is ≥2 kV (HBM model) per IEC 61000-4-2. This is a reference value; confirm the rating for the specific part number.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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voltage:	3.3V ±10%
temperature:	-40°C to +85°C
frequency range:	1 MHz to 10 GHz
jitter tolerance:	±100 ppm

Product Specifications

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