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L2340 데이터시트 PDF




LOGIC Devices Incorporated에서 제조한 전자 부품 L2340은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 L2340 자료 제공

부품번호 L2340 기능
기능 Digital Synthesizer
제조업체 LOGIC Devices Incorporated
로고 LOGIC Devices Incorporated 로고


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L2340 데이터시트, 핀배열, 회로
DEVICES INCORPORATED
DEVICES INCORPORATED
L2340
Digital LSy2nt3he4si0zer
Digital Synthesizer
FEATURES
DESCRIPTION
u Digital Waveform Synthesis at
50 MHz
u 24-Bit Polar Phase Angle Accuracy
u User-selectableWaveformSynthesis,
Frequency Modulation, or Phase
Modulation.
u Amplitude Input for Amplitude
Modulation and Gain Adjustment.
u Replaces TRW/Raytheon/Fairchild
TMC2340A
u 120-pin PQFP
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 ENP1-0 and
accumulator controls FM and PM.
L2340 BLOCK DIAGRAM
ENA
15
AM14-0
2
ENP1-0
32
PH31-0
FM
PM
OBIQ
CLK
Digital
Synthesizer
OEI
16
I15-0
OEQ
16
Q15-0
Special Arithmetic Functions
1 08/16/2000–LDS.2340-E




L2340 pdf, 반도체, 판매, 대치품
DEVICES INCORPORATED
L2340
Digital Synthesizer
Circle Test
When performing a coordinate
transformation, inaccuracies are
introduced by a combination of
quantization and approximation
errors. The accuracy of a coordinate
transformer is dependent on the
word length used for the input
variables, the word length used for
internal calculations, as well as the
number of iterations or steps per-
formed. Truncation errors are due
to the finite word length and ap-
proximation errors are due to the
finite number of iterations. For
example, in the case of performing a
polar-to-rectangular transformation,
the accuracy of the rotation will be
determined by how closely the input
rotation angle was approximated by
the summation of sub-rotation
angles.
In this study, we compare how
accurately a coordinate transformer
with a 16-bit internal processor
versus a 24-bit internal processor
can calculate all the coordinates of a
circle. By setting the radius to
7FFFH, θ is incremented using the
accumulator of the L2340 in steps of
0000 4000H until all the points of a
full circle are calculated into rectan-
gular coordinates.
error will introduce noise when
performing waveform sythesis,
modulation, and demodulation.
Data values for Figure 2 and Figure
3 are shown in Table 3. By looking
at these values, we observe the step
resolution on a 16-bit internal
processor is not 1 unit in the x and
y. In most cases, the minimum step
resolution is 2 units in the x and y.
On the other hand, step resolution
on a 24-bit internal processor is 1
unit in the x and y thus resulting in
greater accuracy.
The minimum theoretical angle
resolution that could be produced is
0.00175° when x = 7FFFH and y = 1H.
A 16-bit internal processor can
produce a minimum angle resolu-
tion of only 0.00549° and will not be
able to properly calculate the
theoretical minimum angle resolu-
tion. On the other hand, a 24-bit
internal processor can produce a
minimum angle resolution of
0.00002° and could therefore prop-
erly calculate the theoretical mini-
mum angle resolution.
FIGURE 2. CIRCLE TEST RESULT NEAR 45° (16-BIT INTERNAL PROCES-
SOR)
23200
23190
23180
Y 23170
23160
23150
23140
23140 23150 23160 23170 23180 23190 23200
X
The resulting rectangular coordi-
nates were plotted and graphed. A
graphical representation of the
resulting vectors for both 16-bit and
24-bit internal processors are com-
pared at 45°. Theoretically, a
perfect circle is the desired output
but when the resulting vectors from
a coordinate transformer with 16-bit
internal processor are graphed and
displayed as shown in Figure 2, we
see significant errors due to the
inherent properties of a digital
synthesizer. In comparison, the 24-
bit internal processor proves to be
significantly more accurate than a
16-bit internal processor due to
minimization of truncation errors.
In many applications, this margin of
FIGURE 3.
SOR)
CIRCLE TEST RESULT NEAR 45° (24-BIT INTERNAL PROCES-
23200
23190
23180
Y 23170
23160
23150
23140
23140 23150 23160 23170 23180 23190 23200
X
Special Arithmetic Functions
4 08/16/2000–LDS.2340-E

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L2340 전자부품, 판매, 대치품
DEVICES INCORPORATED
L2340
Digital Synthesizer
SWITCHING CHARACTERISTICS
COMMERCIAL OPERATING RANGE (0°C to +70°C) Notes 9, 10 (ns)
Symbol Parameter
tCYC Cycle Time
tPWL Clock Pulse Width Low
tPWH Clock Pulse Width High
tS Input Setup Time
tH Input Hold Time
tD Output Delay
tENA Three-State Output Enable Delay (Note 11)
tDIS Three-State Output Disable Delay (Note 11)
111111111111111111111111111111112222222222222222222222222222222233333333333333333333333333333333M15144444444444444444444444444444444i8100255555555555555555555555555555555n6666666666666666666666666666666677777777777777777777777777777777588888888888888888888888888888888099999999999999999999999999999999*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*55555555555555555555555555555555066666666666666666666666666666666M11177777777777777777777777777777777a83388888888888888888888888888888888x999999999999999999999999999999990000000000000000000000000000000011111111111111111111111111111111
20
Min Max
20
7
6
6
1
16
13
13
MILITARY OPERATING RANGE (–55°C to +125°C) Notes 9, 10 (ns)
Symbol Parameter
tCYC Cycle Time
tPWL Clock Pulse Width Low
tPWH Clock Pulse Width High
tS Input Setup Time
tH Input Hold Time
tD Output Delay
tENA Three-State Output Enable Delay (Note 11)
tDIS Three-State Output Disable Delay (Note 11)
111111111111111111111111111111112222222222222222222222222222222233333333333333333333333333333333M15144444444444444444444444444444444i8210355555555555555555555555555555555n6666666666666666666666666666666677777777777777777777777777777777588888888888888888888888888888888099999999999999999999999999999999*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*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*8888888888888888888888888888888899999999999999999999999999999999M11100000000000000000000000000000000a83311111111111111111111111111111111x222222222222222222222222222222223333333333333333333333333333333344444444444444444444444444444444
1111*2222D3333I4444S5555C6666O7777N8888TI9999N0000U1111E2222D3333S4444P5555E6666E7777D888899990000111122223333
GRADE
Special Arithmetic Functions
7 08/16/2000–LDS.2340-E

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부품번호상세설명 및 기능제조사
L2340

Digital Synthesizer

LOGIC Devices Incorporated
LOGIC Devices Incorporated

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