Ultrafast, SiGe, Open-Collector
HVDS Clock/Data Buffer
ADCLK914
FUNCTIONAL BLOCK DIAGRAM
FEATURES
7.5 GHz operating frequency
160 ps propagation delay
V
V
CC
REF
100 ps output rise/fall
110 fs random jitter
On-chip input terminations
Extended industrial temperature range: −40°C to +125°C
3.3 V power supply (VCC − VEE
ADCLK914
V
T
50Ω
50Ω
50Ω 50Ω
Q
Q
D
D
)
APPLICATIONS
Clock and data signal restoration
High speed converter clocking
Broadband communications
Cellular infrastructure
V
EE
Figure 1.
High speed line receivers
ATE and high performance instrumentation
Level shifting
Threshold detection
GENERAL DESCRIPTION
The input has a center tapped, 100 Ω, on-chip termination
resistor and accepts LVPECL, CML, CMOS, LVTTL, or LVDS
(ac-coupled only). A VREF pin is available for biasing ac-coupled
inputs.
The ADCLK914 is an ultrafast clock/data buffer fabricated on
the Analog Devices, Inc., proprietary, complementary bipolar
(XFCB-3) silicon-germanium (SiGe) process. The ADCLK914
features high voltage differential signaling (HVDS) outputs
suitable for driving the latest Analog Devices high speed digital-
to-analog converters (DACs). The ADCLK914 has a single,
differential open-collector output.
The HVDS output stage is designed to directly drive 1.9 V each
side into 50 Ω terminated to VCC for a total differential output
swing of 3.8 V.
The ADCLK914 buffer operates up to 7.5 GHz with a 160 ps
propagation delay and adds only 110 fs random jitter (RJ).
The ADCLK914 is available in a 16-lead LFCSP. It is specified
for operation over the extended industrial temperature range of
−40°C to +125°C.
Rev. A
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