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HSP45106
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16-Bit Numerically Controlled Oscillator
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DATASHEET
FN2809
Rev 8.00
October 16, 2008
The Intersil HSP45106 is a high performance 16-bit
quadrature Numerically Controlled Oscillator (NCO16). The
NCO16 simplifies applications requiring frequency and
phase agility such as frequency-hopped modems, PSK
modems, spread spectrum communications, and precision
signal generators. As shown in the block diagram, the
HSP45106 is divided into a Phase/Frequency Control
Section (PFCS) and a Sine/Cosine Section.
Features
The inputs to the Phase/Frequency Control Section consist
of a microprocessor interface and individual control lines.
The frequency resolution is 32 bits, which provides for
resolution of better than 0.008Hz at 33MHz. User
programmable center frequency and offset frequency
registers give the user the capability to perform phase
coherent switching between two sinusoids of different
frequencies. Further, a programmable phase control register
allows for phase control of better than 0.006°. In applications
requiring up to 8-level PSK, three discrete inputs are
provided to simplify implementation.
• Output in Two’s Complement or Offset Binary
The output of the PFCS is a 28-bit phase which is input to
the Sine/Cosine Section for conversion into sinusoidal
amplitude. The outputs of the Sine/Cosine Section are two
16-bit quadrature signals. The spurious free dynamic range
of this complex vector is greater than 90dBc.
For added flexibility when using the NCO16 in conjunction
with DACs, a choice of either parallel or serial outputs with
either two’s complement or offset binary encoding is
provided. In addition, a synchronization signal is available
which indicates serial word boundaries.
• 25.6MHz, 33MHz Versions
• 32-Bit Center and Offset Frequency Control
• 16-Bit Phase Control
• 8-Level PSK Supported Through Three Pin Interface
• Simultaneous 16-Bit Sine and Cosine Outputs
•
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