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L2340QC20 Datasheet

  • L2340QC20

  • Digital Synthesizer

  • 270.10KB

  • 11頁(yè)

  • LOGIC

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L2340
DEVICES INCORPORATED
Digital Synthesizer
L2340
DEVICES INCORPORATED
Digital Synthesizer
DESCRIPTION
The
L2340
is a digital synthesizer that
performs waveform synthesis, modu-
lation, and demodulation.
The L2340 automatically generates
quadrature matched pairs of 16-bit
sine and cosine waves in DAC-
compatible 16-bit offset binary format
with15-bit amplitude and 32-bit phase
inputs.
Output waveforms can be phase or
frequency modulated. Digital output
frequencies are restricted to the
Nyquist limit.
Functional Description
The L2340 converts Polar (Phase and
Magnitude) data into Rectangular
(Cartesian) coordinates. The user
selects the numeric format. A valid
transformed result is seen at the
output after 22 clock cycles and will
continue upon every clock cycle
thereafter.
15-bit amplitude and 32-bit phase data
are input into the L2340 to produce an
output of 16-bit rectangular data. The
user may select the data format to
either 16-bit offset binary or 15-bit
unsigned magnitude format. High
accuracy phase increment values with
minimal accumulation error is accom-
plished by use of a 32-bit phase
accumulator.
The phase accumulator structure
supports frequency or phase modula-
tion and is selected by ENP
1-0
and
accumulator controls FM and PM.
FEATURES
u
Digital Waveform Synthesis at
50 MHz
u
24-Bit Polar Phase Angle Accuracy
u
User-selectable Waveform Synthesis,
Frequency Modulation, or Phase
Modulation.
u
Amplitude Input for Amplitude
Modulation and Gain Adjustment.
u
Replaces TRW/Raytheon/Fairchild
TMC2340A
u
120-pin PQFP
L2340 B
LOCK
D
IAGRAM
ENA
AM
14-0
ENP
1-0
PH
31-0
15
2
32
16
OEI
Digital
Synthesizer
16
I
15-0
FM
PM
OBIQ
OEQ
Q
15-0
CLK
Special Arithmetic Functions
1
08/16/2000鈥揕DS.2340-E

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