CLC016

Data Retiming PLL with Automatic Rate Selection

General Description

National’s Comlinear CLC016 is a low-cost, monolithic, data

retiming phase-locked loop (PLL) designed for high-speed

serial clock and data recovery. The CLC016 simplifies high-

speed data recovery in multi-rate systems by incorporating

auto-rate select (ARS) circuitry on chip. This function allows

the user to configure the CLC016 to recognize up to four dif-

ferent data rates and automatically adjust to provide accu-

rate, low-jitter clock and data recovery. A single resistor is

used to set each data rate anywhere between 40 Mbps and

400 Mbps. No potentiometers, crystals, or other external ICs

are required to set the rate.

The CLC016 has output jitter of only 130 ps

data rate and 0.25% fractional loop bandwidth. Low phase

detector output offset and low VCO injection combine to en-

sure that the CLC016 does not generate bit errors or large

phase transients in response to extreme fluctuations in data

transition density. The result is improved performance when

handling the pathological patterns inherent in the SMPTE

259M video industry standard.

The carrier detect and output mute functions may be used

together to automatically latch the outputs when no data is

present, preventing random transitions. The external loop fil-

ter allows the user to tailor the loop response to the specific

application needs. The CLC016 will operate with either +5V

or −5.2V power supplies. The serial data inputs and outputs,

as well as the recovered clock outputs, allow single- or

differential-ECL interfacing. The logic control inputs are TTL-

compatible.

Applications

n SMPTE 259M serial digital interfaces: NTSC/PAL, 4:2:2

component, 360 Mbps wide screen

n Serial digital video routing and distribution

n Clock and data recovery for high-speed data

transmission

n Re-synchronization of serial data for SONET/SDH, ATM,

CAD networks, medical and industrial imaging

Features

n Retimed data output

n Recovered clock output

n Auto and manual rate select modes

n Four user-configurable data rates

n No potentiometers required

n External loop bandwidth control

n Frequency detector for lock acquisition

n Carrier detect output

n Output MUTE function

n Single supply operation: +5V or −5.2V

n Low cost

Key Specifications

bandwidth (0.675 MHz)

n High data rates: 40 Mbps − 400 Mbps

n Low supply current: 100 mA, including output biasing

n Flexible fractional loop bandwidth: from 0.05% to 0.5%

Order Number

Temperature

Package

CLC016ACQ

0˚C to +70˚C

PLCC V28A

CLC016AJQ

–40˚C to +85˚C

PLCC V28A

DS100087-1

July 1998

© 1998 National Semiconductor Corporation

DS100087

www.national.com