PL560-37 Datasheet, PDF (2/15 Pages) Micrel Semiconductor – Analog Frequency Multiplier

Analog Frequency Multiplier
PL56X-XX VCXO Family
VCON
L2X
XIN
XOUT
Oscillator
Amplifier
Only required in x4 designs
Frequency
X2
Frequency
X4
L4X
Figure 2: Block Diagram of VCXO AFM
OE
QBAR
Q
Figure 3 shows the period jitter histogram of the 2x Analog Frequency Multiplier at 311.04 MHz, while Figure 4
shows the very low rejection levels of sub-harmonics that correspond to the exceptionally low jitter performance.
Figure 3: Period Jitter Histogram at 311.04 MHz
Analog Frequency Multiplier (2x)
with 155.52MHz crystal
Figure 4: Spectrum Analysis at 311.04 MHz
Analog Frequency Multiplier (2x)
with sub-harmonics below –72 dBc
OE LOGIC SELECTION
OUTPUT
OESEL
OE
LVPECL
0 (Default)
1
0 (Default)
1
0
1 (Default)
LVDS or LVCMOS
0 (Default)
1
0
1 (Default)
0 (Default)
1
OESEL and OE: Connect to VDD or leave floating to set to “1”, connect to GND to set to “0”.
Internally set to default through pull-down / -up.
Output State
Enabled
Tri-state
Tri-state
Enabled
Tri-state
Enabled
Enabled
Tri-state
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax [phone] • www.micrel.com Rev 11/04/11 Page 2