1633966 Datasheet, PDF (1/20 Pages) Texas Instruments – 2:4 Low Additive Jitter LVDS Buffer

CDCLVD1204
www.ti.com
SCAS898A – MAY 2010 – REVISED JUNE 2010
2:4 Low Additive Jitter LVDS Buffer
Check for Samples: CDCLVD1204
FEATURES
1
• 2:4 Differential Buffer
• Low Additive Jitter: <300 fs RMS in 10-kHz to
20-MHz
• Low Output Skew of 20 ps (Max)
• Universal Inputs Accept LVDS, LVPECL, and
LVCMOS
• Selectable Clock Inputs through Control Pin
• 4 LVDS Outputs, ANSI EAI/TIA-644A Standard
Compatible
• Clock Frequency up to 800 MHz
• 2.375 V–2.625 V Device Power Supply
• LVDS Reference Voltage, V_{AC_REF}, Available for
Capacitive Coupled Inputs
• Industrial Temperature Range: –40°C to 85°C
• Packaged in 3 mm × 3 mm 16-Pin QFN (RGT)
• ESD Protection Exceeds 3 kV HBM, 1 kV CDM
APPLICATIONS
• Telecommunications/Networking
• Medical Imaging
• Test and Measurement Equipment
• Wireless Communications
• General Purpose Clocking
DESCRIPTION
The CDCLVD1204 clock buffer distributes one of two
selectable clock inputs, (IN0, IN1), to 4 pairs of
differential LVDS clock outputs (OUT0, OUT3) with
minimum skew for clock distribution. The
CDCLVD1204 can accept two clock sources into an
input multiplexer. The inputs can either be LVDS,
LVPECL, or LVCMOS.
The CDCLVD1204 is specifically designed for driving
50 Ω transmission lines. In case of driving the inputs
in single ended mode, the appropriate bias voltage
(V_{AC_REF}) should be applied to the unused negative
input pin.
The IN_SEL pin selects the input which is routed to
the outputs. If this pin is left open it disables the
outputs (static). The part supports a fail safe function.
The device incorporates an input hysteresis which
prevents random oscillation of the outputs in the
absence of an input signal.
The device operates in 2.5V supply environment and
is characterized from –40°C to 85°C (ambient
temperature). The CDCLVD1204 is packaged in
small 16-pin, 3-mm × 3-mm QFN package.
156.25 MHz
Oscillator
(156.25
MHz)
IN_SEL
CDCLVD 1204
LVDS Buffer
ASIC
PHY1
PHY2
FPGA
Figure 1. Application Example
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010, Texas Instruments Incorporated