L2340
DEVICES INCORPORATED
Digital Synthesizer
L2340
Digital Synthesizer
DEVICES INCORPORATED
FEATURES
DESCRIPTION
The L2340 is a digital synthesizer that selects the numeric format. A valid
❑ Digital Waveform Synthesis at
50 MHz
performs waveform synthesis, modu-
lation, and demodulation.
transformed result is seen at the
output after 22 clock cycles and will
continue upon every clock cycle
thereafter.
❑ 24-Bit Polar Phase Angle Accuracy
❑ User-selectableWaveformSynthesis,
Frequency Modulation, or Phase
Modulation.
The L2340 automatically generates
quadrature matched pairs of 16-bit
sine and cosine waves in DAC-
15-bit amplitude and 32-bit phase data
❑ Amplitude Input for Amplitude
compatible 16-bit offset binary format are input into the L2340 to produce an
with15-bit amplitude and 32-bit phase output of 16-bit rectangular data. The
Modulation and Gain Adjustment.
inputs.
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.
❑ Replaces TRW/Raytheon/Fairchild
TMC2340A
Output waveforms can be phase or
frequency modulated. Digital output
frequencies are restricted to the
Nyquist limit.
❑ 120-pin PQFP (RoHS compliant)
Functional Description
The phase accumulator structure
supports frequency or phase modula-
tion and is selected by ENP1-0 and
accumulator controls FM and PM.
The L2340 converts Polar (Phase and
Magnitude) data into Rectangular
(Cartesian) coordinates. The user
L2340 BLOCK DIAGRAM
ENA
15
AM14-0
OEI
2
ENP1-0
16
16
32
I
15-0
PH31-0
Digital
Synthesizer
OEQ
FM
PM
Q
15-0
OBIQ
CLK
Special Arithmetic Functions
08/16/2000–LDS.2340-E
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