LVPECL

12

12

Reference

Generator

GND

GND

OUTP[11...0]

OUTN[11...0]

V

CC

V

AC_REF

V

CC

V

CC

V

CC

V

CC

V

CC

INP0

INN0

INP1

INN1

IN_SEL

CDCLVP1212

www.ti.com

SCAS886A – AUGUST 2009 – REVISED MAY 2010

12 LVPECL Output, High-Performance Clock Buffer

Check for Samples: CDCLVP1212

1

FEATURES

DESCRIPTION

2

•

2:12 Differential Buffer

The CDCLVP1212 is a highly versatile, low additive

jitter buffer that can generate 12 copies of LVPECL

•

Selectable Clock Inputs Through Control Pin

clock outputs from one of two selectable LVPECL,

•

Universal Inputs Accept LVPECL, LVDS, and

LVDS,

or

LVCMOS

inputs

for

a

variety

of

LVCMOS/LVTTL

communication applications. It has a maximum clock

•

12 LVPECL Outputs

frequency up to 2 GHz. The CDCLVP1212 features

an on-chip multiplexer (MUX) for selecting one of two

•

Maximum Clock Frequency: 2 GHz

inputs that can be easily configured solely through a

•

Maximum Core Current Consumption: 88 mA

control pin. The overall additive jitter performance is

•

Very Low Additive Jitter: <100 fs,rms in 10-kHz

less than 0.1 ps, RMS from 10 kHz to 20 MHz, and

to 20-MHz Offset Range

overall output skew is as low as 25 ps, making the

device a perfect choice for use in demanding

•

2.375-V to 3.6-V Device Power Supply

applications.

•

Maximum Propagation Delay: 550 ps

The CDCLVP1212 clock buffer distributes one of two

•

Maximum Output Skew: 25 ps

selectable clock inputs (IN0, IN1) to 12 pairs of

•

differential LVPECL clock outputs (OUT0, OUT11)

for Capacitive-Coupled Inputs

with

minimum

skew

for

clock

distribution.

The

•

Industrial Temperature Range: –40°C to +85°C

CDCLVP1212 can accept two clock sources into an

input multiplexer. The inputs can be LVPECL, LVDS,

•

ESD Protection Exceeds 2 kV (HBM)

or LVCMOS/LVTTL.

•

Available in 6-mm × 6-mm QFN-40 (RHA)

The CDCLVP1212 is specifically designed for driving

Package

50-

Ω transmission lines. When driving the inputs in

single-ended

mode,

the

LVPECL

bias

voltage

APPLICATIONS

•

Wireless Communications

input pin. However, for high-speed performance up to

•

Telecommunications/Networking

2 GHz, differential mode is strongly recommended.

•

Medical Imaging

The CDCLVP1212 is packaged in a small 40-pin,

•

Test and Measurement Equipment

6-mm x 6-mm QFN package and is characterized for

operation from –40°C to +85°C.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009–2010, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.