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PL565-37 Datasheet Preview

PL565-37 Datasheet

Analog Frequency Multiplier

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(Preliminary) Analog Frequency Multiplier
PL565-37/38 VCXO Family
PRODUCT DESCRIPTION
The Analog Frequency Multiplier (AFM) is the
industry’s first ‘Balanced Oscillator’ utilizing analog
multiplication of the fundamental frequency (at
double or quadruple frequency), combined with an
attenuation of the fundamental of the reference
crystal, without the use of a phase-locked loop
(PLL), in CMOS technology.
The PL565-37/38 products can achieve up to 250
MHz output frequency with little jitter or phase noise
deterioration. In addition, the low frequency input
crystal requirement makes the AFMs the most
affordable high-performance timing-source in the
market.
Product Selector
Part Number
PL565-38
PL565-37
Output Type
PECL Output
CMOS Output
FEATURES
Non-PLL frequency multiplication
Input frequency from 30-62.5 MHz
Output frequency from 120-250 MHz
Low phase noise and jitter (equivalent to fundamental
crystal at the output frequency)
Ultra-low jitter
o RMS phase jitter < 0.25 ps (12kHz-20MHz)
o RMS period jitter < 25 ps
Low phase noise
o -147 dBc/Hz @100kHz offset from 155.52 MHz
o -157 dBc/Hz @10MHz offset from 155.52 MHz
High linearity pull range (typ. 5%)
+/- 120 PPM pullability VCXO
Low input frequency eliminates the need for expensive
crystals
Differential output levels PECL or single-ended CMOS
Single 3.3V, ±10% power supply
Optional industrial temperature range (-40C to +85C)
Figure 1: 4X AFM Phase Noise at 155.52MHz
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1(408) 944-0800 • fax +1(408) 474-1000 • www.micrel.com Rev 11/18/11 Page 1




Micrel

PL565-37 Datasheet Preview

PL565-37 Datasheet

Analog Frequency Multiplier

No Preview Available !

(Preliminary) Analog Frequency Multiplier
PL565-37/38 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 4X 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 155.52 MHz
Analog Frequency Multiplier (4x)
with 38.88MHz crystal
Figure 4: Spectrum Analysis at 155.52 MHz
Analog Frequency Multiplier (4x)
with sub-harmonics below 39 dBc
OE LOGIC SELECTION
OUTPUT
OESEL
OE
LVPECL
0 (Default)
1
0 (Default)
1
0
1 (Default)
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 +1(408) 944-0800 • fax +1(408) 474-1000 • www.micrel.com Rev 11/18/11 Page 2


Part Number PL565-37
Description Analog Frequency Multiplier
Maker Micrel
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