HMC987LP5E_12 Datasheet, PDF (1/24 Pages) Hittite Microwave Corporation – LOW NOISE 1:9 FANOUT BUFFER

v01.0512
Typical Applications
The is suitable for:
• 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
Functional Diagram
HMC987LP5E
LOW NOISE 1:9 FANOUT BUFFER
DC - 8 GHz
Features
Ultra Low Noise Floor: -166 dBc/Hz @ 2 GHz
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:
-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
General Description
The 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, 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 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.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
1
Phone: [phone] Fax: [phone] Order On-line at www.hittite.com
Application Support: Phone: [phone] or [e-mail]