Features
• Output frequency range: 1.925 GHz to 16 GHz
– RF out 1 (VCO, VCO÷2): 1.925-8.0 GHz
– RF out 2 (VCO x 2): 7.7-16.0 GHz
• Very low noise
– Normalized phase noise floor: -227 dBc/Hz
– VCO phase noise (6.0 GHz): -131 dBc/Hz
@ 1 MHz offset
– Noise floor (6.0 GHz): -158 dBc/Hz
– Phase noise (12 GHz): -125 dBc/Hz
@ 1 MHz offset
– Noise floor (12 GHz): -154 dBc/Hz
• Integrated VCOs with fast automatic center
frequency calibration
• External VCO option with 5 V charge pump
• Fundamental VCO rejection at doubler output
higher than 20 dB
• Internally broadband matched RF outputs
delivering +6 dBm @6 GHz and +4 dBm
@12 GHz single-ended
• Integrated low noise LDOs
• Maximum phase detector frequency: 100 MHz
• Exact frequency mode
• Differential reference clock input (LVDS and
LVECPL compliant) supporting up to 800 MHz
• Integrated reference crystal oscillator core
• R/W SPI interface
• Logic compatibility/tolerance 1.8 V/3.3 V
• Supply voltage: 3.0 V to 5.4 V
• Small size exposed pad VFQFPN36 package
6x6x1.0 mm
• Process: BICMOS 0.25 μm SiGe

Applications
• Infrastructure equipment
• Satellite communications for terrestrial
applications
• Other wireless communication systems

Description
The STuW81300 includes a dual architecture
frequency synthesizer (Fractional-N and Integer-
N), four low phase noise VCOs with a fast
automatic center frequency calibration providing a
very wide frequency range, from 1.925 GHz to
16 GHz, with a single device.
The STuW81300 optimizes size and cost of the
final application by the integration of low noise
LDO voltage regulators and internally matched
broadband RF outputs.
Additional features include a crystal oscillator
core, external VCO mode, output mute function
and low power mode to trade current
consumption with phase noise performance
and/or output level.