ADCLK944 Datasheet, PDF (1/12 Pages) Analog Devices – 2.5 V/3.3 V, Four LVPECL Outputs, SiGe Clock Fanout Buffer

FEATURES
Operating frequency: 7.0 GHz
Broadband random jitter: 50 fs rms
On-chip input terminations
Power supply (VCC − VEE): 2.5 V to 3.3 V
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
2.5 V/3.3 V, Four LVPECL Outputs,
SiGe Clock Fanout Buffer
ADCLK944
FUNCTIONAL BLOCK DIAGRAM
ADCLK944
V_REF
REFERENCE
V_T
CLK
CLK
LVPECL
Q0
Q0
Q1
Q1
Q2
Q2
Q3
Q3
Figure 1.
GENERAL DESCRIPTION
The ADCLK944 is an ultrafast clock fanout buffer fabricated on
the Analog Devices, Inc., proprietary XFCB3 silicon germanium
(SiGe) bipolar process. This device is designed for high speed
applications requiring low jitter.
The device has a differential input equipped with center-tapped,
differential, 100 Ω on-chip termination resistors. The input can
accept dc-coupled LVPECL, CML, 3.3 V CMOS (single-ended),
and ac-coupled 1.8 V CMOS, LVDS, and LVPECL inputs. A VREF
pin is available for biasing ac-coupled inputs.
The ADCLK944 features four 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 ECL output stages are designed to directly drive 800 mV
each side into 50 Ω terminated to VCC − 2 V for a total differen-
tial output swing of 1.6 V.
The ADCLK944 is available in a 16-lead LFCSP and is specified
for operation over the standard industrial temperature range of
−40°C to +85°C.
Rev. 0
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