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Analog Devices - SiGe Clock Fanout Buffer

Numéro de référence ADCLK954
Description SiGe Clock Fanout Buffer
Fabricant Analog Devices 
Logo Analog Devices 





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Two Selectable Inputs, 12 LVPECL Outputs,
SiGe Clock Fanout Buffer
ADCLK954
FEATURES
2 selectable differential inputs
4.8 GHz operating frequency
75 fs rms broadband random jitter
On-chip input terminations
3.3 V power supply
APPLICATIONS
Low jitter clock distribution
Clock and data signal restoration
Level translation
Wireless communications
Wired communications
Medical and industrial imaging
ATE and high performance instrumentation
GENERAL DESCRIPTION
The ADCLK954 is an ultrafast clock fanout buffer fabricated on
the Analog Devices, Inc., proprietary XFCB3 silicon germa-
nium (SiGe) bipolar process. This device is designed for high
speed applications requiring low jitter.
The device has two selectable differential inputs via the IN_SEL
control pin. Both inputs are equipped with center tapped,
differential, 100 Ω on-chip termination resistors. The inputs
accept dc-coupled LVPECL, CML, 3.3 V CMOS (single-ended),
and ac-coupled 1.8 V CMOS, LVDS, and LVPECL inputs. A
VREFx pin is available for biasing ac-coupled inputs.
The ADCLK954 features 12 full-swing emitter coupled logic
(ECL) output drivers. For LVPECL (positive ECL) operation,
bias VCC to the positive supply and VEE to ground. For ECL
operation, bias VCC to ground and VEE to the negative supply.
The output stages are designed to directly drive 800 mV each
side into 50 Ω terminated to VCC − 2 V for a total differential
output swing of 1.6 V.
The ADCLK954 is available in a 40-lead LFCSP and specified
for operation over the standard industrial temperature range of
−40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
ADCLK954
LVPECL
Q0
Q0
Q1
Q1
Q2
Q2
VREF0
REFERENCE
Q3
Q3
VT0
CLK0
CLK0
VT1
CLK1
CLK1
Q4
Q4
Q5
Q5
Q6
Q6
IN_SEL
Q7
Q7
VREF1
REFERENCE
Q8
Q8
Q9
Q9
Q10
Q10
Q11
Q11
Figure 1.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2009 Analog Devices, Inc. All rights reserved.

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