SI515 Datasheet, PDF (1/22 Pages) Silicon Laboratories – VOLTAGE-CONTROLLED CRYSTAL OSCILLATOR

Si515
VOLTAGE-CONTROLLED CRYSTAL OSCILLATOR (VCXO)
100 kHZ TO 250 MHZ
Features
 Supports any frequency from  Optional integrated 1:2 CMOS
100 kHz to 250 MHz
fanout buffer
 Low-jitter operation
 3.3 and 2.5 V supply options
 Short lead times: <2 weeks
 Industry-standard 3.2 x 5.0 mm
 AT-cut fundamental mode crystal and 5 x 7 mm package/pinouts
ensures high reliability/low aging  Pb-free/RoHS-compliant
 High power supply noise rejection  Selectable Kv (60, 90, 120,
 1% control voltage linearity
150 ppm/V)
 Available CMOS, LVPECL, LVDS,
and HCSL outputs
Applications
 SONET/SDH/OTN
 PON
 Low Jitter PLLs
 xDSL
Description
 Broadcast video
 Telecom
 Switches/routers
 FPGA/ASIC clock generation
The Si515 VCXO utilizes Silicon Laboratories' advanced PLL technology to
provide any frequency from 100 kHz to 250 MHz. Unlike a traditional VCXO where
a different crystal is required for each output frequency, the Si515 uses one fixed
crystal and Silicon Labs’ proprietary synthesizer to generate any frequency across
this range. This IC-based approach allows the crystal resonator to provide
enhanced reliability, improved mechanical robustness, and excellent stability. In
addition, this solution provides superior control voltage linearity and supply noise
rejection, improving PLL stability and simplifying low jitter PLL design in noisy
environments. The Si515 is factory-configurable for a wide variety of user
specifications, including frequency, supply voltage, output format, tuning slope and
stability. Specific configurations are factory-programmed at time of shipment,
eliminating long lead times and non-recurring engineering charges associated with
custom frequency oscillators.
Functional Block Diagram
V_DD
Si5602
Ordering Information:
See page 14.
Pin Assignments:
See page 12.
Vc ¹
OE ²
GND 3
6 VDD
5 NC
4 CLK
CMOS VCXO
Vc ¹
6 VDD
OE ²
5 CLK–
GND 3
4 CLK+
LVPECL/LVDS/HCSL/
Dual CMOS VCXO
OE
Vc
Fixed
Frequency
Oscillator
Power Supply Filtering
Any-Frequency
0.1 to 250 MHz
Clock Synthesis
ADC
CLK+
CLK–
Rev. 1.0 6/12
GND
Copyright © 2012 by Silicon Laboratories
Si515