Datasheet

Ultrafast, SiGe, Open-Collector
HVDS Clock/Data Buffer
ADCLK914
Rev. A
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.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] ©2008 Analog Devices, Inc. All rights reserved.
FEATURES FEATURES
7.5 GHz operating frequency 7.5 GHz operating frequency
160 ps propagation delay 160 ps propagation delay
100 ps output rise/fall 100 ps output rise/fall
110 fs random jitter 110 fs random jitter
On-chip input terminations On-chip input terminations
Extended industrial temperature range: −40°C to +125°C Extended industrial temperature range: −40°C to +125°C
3.3 V power supply (V
CC
− V
EE
) 3.3 V power supply (V
CC
− V
EE
)
APPLICATIONS APPLICATIONS
Clock and data signal restoration Clock and data signal restoration
High speed converter clocking High speed converter clocking
Broadband communications Broadband communications
Cellular infrastructure Cellular infrastructure
High speed line receivers High speed line receivers
ATE and high performance instrumentation ATE and high performance instrumentation
Level shifting Level shifting
Threshold detection Threshold detection
FUNCTIONAL BLOCK DIAGRAM FUNCTIONAL BLOCK DIAGRAM
D
D
Q
V
CC
V
EE
V
T
Q
D
D
Q
V
CC
V
EE
V
T
Q
V
REF
06561-001
50Ω 50Ω
50Ω 50Ω
ADCLK914
Figure 1.
GENERAL DESCRIPTION
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 ADCLK914 buffer operates up to 7.5 GHz with a 160 ps
propagation delay and adds only 110 fs random jitter (RJ).
The input has a center tapped, 100 Ω, on-chip termination
resistor and accepts LVPECL, CML, CMOS, LVTTL, or LVDS
(ac-coupled only). A V
REF
pin is available for biasing ac-coupled
inputs.
The HVDS output stage is designed to directly drive 1.9 V each
side into 50 Ω terminated to V
CC
for a total differential output
swing of 3.8 V.
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.