HMC987LP5E Datasheet, PDF (1/24 Pages) Hittite Microwave Corporation – LOW NOISE 1:9 FANOUT BUFFER DC - 8 GHz

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HMC987LP5E
LOW NOISE 1:9 FANOUT BUFFER
DC - 8 GHz
Typical Applications
Features
The HMC987LP5E is suitable for:
Ultra Low Noise Floor: -166 dBc/Hz @ 2 GHz
• SONET, Fibre Channel, GigE Clock Distribution
• ADC/DAC Clock Distribution
• Low Skew and Jitter Clock or Data Fanout
• Wireless/Wired Communications
• Level Translation
• High Performance Instrumentation
• Medical Imaging
• Single-Ended to Differential Conversion
Wideband: DC - 8 GHz Operating Frequency
Flexible Input Interface:
LVPECL, LVDS, CML, CMOS Compatible
AC or DC Coupling
On-Chip Termination 50 or 150 Ω (100/300 Ω Diff.)
Multiple Output Drivers:
Up to 8 Differential or 16 Single-Ended LVPECL
Outputs:
800 mVpp into 50 Ω Single-Ended (+3 dBm Fo)
One Adjustable Power CML/RF Output:
3
-9 to 3 dBm Single-Ended
Serial or Parallel Control, Hardware Chip-Enable
Power-Down Current < 1 uA
32 Lead 5x5 mm SMT Package 25 mm²
Functional Diagram
General Description
The HMC987LP5E 1-to-9 fanout buffer is designed
for low noise clock distribution. It is intended to
generate relatively square wave outputs with rise/
fall times < 100 ps. The low skew and jitter outputs
of the HMC987LP5E, combined with its fast rise/
fall times, leads to controllable low-noise switching
of downstream circuits such as mixers, ADCs/DACs
or SERDES devices. The noise floor is particularly
important in these applications, when the clock-
network bandwidth is wide enough to allow square-
wave switching. Driven at 2 GHz, outputs of the
HMC987LP5E have a noise floor of -166 dBc/Hz,
corresponding to a jitter density of 0.6 asec/rtHz - or
50 fs over an 8 GHz bandwidth.
The input stage can be driven single-ended or
differentially, in a variety of signal formats (CML,
LVDS, LVPECL or CMOS), AC or DC coupled. The
input stage also features adjustable input impedance.
It has 8 LVPECL outputs, and 1 CML output with
adjustable swing/power-level in 3 dB steps.
Individual output stages may be enabled or disabled
for power-savings when not required using either
hardware control pins, or under control of a serial-port
interface.
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For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
978-250-3343 tel • 978-250-3373 fax • Order On-line at www.hittite.com
Application Support: [e-mail]