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L2330 Datasheet(PDF) 3 Page - LOGIC Devices Incorporated

Part # L2330
Description  Coordinate Transformer
PDF  14 Pages
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Manufacturer  LODEV [LOGIC Devices Incorporated]
Direct Link  http://www.logicdevices.com
Logo LODEV - LOGIC Devices Incorporated

L2330 Datasheet(HTML) 3 Page - LOGIC Devices Incorporated

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DEVICES INCORPORATED
Special Arithmetic Functions
3
L2330
Coordinate Transformer
09/27/2001–LDS.2330-E
FIGURE 1A.INPUT FORMATS
15 14 13
2
1
0
2
15 214 213
2
2
2
1
2
0
31 30 29
2
1
0
*±2
0 2–1 2–2
2
–29 2–30 2–31
15 14 13
2
1
0
NS 2
14 213
2
2
2
1
2
0
31 30 29
18 17 16
NS 2
14 213
2
2
2
1
2
0
Integer Signed Magnitude (RTP = 1, TCXY = 0)
15 14 13
2
1
0
–2
15 214 213
2
2
2
1
2
0
31 30 29
18 17 16
–2
15 214 213
2
2
2
1
2
0
Integer Two's Complement (RTP = 1, TCXY = 1)
XRIN
YPIN
15 14 13
2
1
0
2
0
2
–1 2–2
2
–13 2–14 2–15
31 30 29
2
1
0
*±2
0 2–1 2–2
2
–29 2–30 2–31
Fract. Unsigned Mag./Two's Comp.
15 14 13
2
1
0
NS 2
–1 2–2
2
–13 2–14 2–15
31 30 29
18 17 16
NS 2
–1 2–2
2
–13 2–14 2–15
Fractional Signed Magnitude (RTP = 1, TCXY = 0)
15 14 13
2
1
0
–2
0 2–1 2–2
2
–13 2–14 2–15
31 30 29
18 17 16
–2
0 2–1 2–2
2
–13 2–14 2–15
Fractional Two's Complement (RTP = 1, TCXY = 1)
*±2
0 denotes two's complement sign or highest magnitude bit. Since phase angles are modulo 2π
and phase accumulator is modulo 2
32, this bit may be regarded as ±π.
NS denotes negative sign. (i.e. '1' negates the number)
Fractional Unsigned Magnitude
(RTP = 0)
Fract. Unsigned Mag./Two's Comp.
Integer Unsigned Magnitude
(RTP = 0)
Table 1. ‘M’ is the Modulation
Register and ‘C’ is the Carrier Register
as shown in the Functional Block
Diagram.
RTP — Rectangular-to-Polar
When RTP is HIGH, Rectangular-to-
Polar conversion mode is selected.
When RTP is LOW, Polar-to-Rectan-
gular conversion mode is selected.
ACC1-0 — Accumulator Control
ACC1-0 is the 2-bit accumulator
control that determines four modes as
shown in Table 2. Changing of the
internal phase Accumulator structure
is very useful when RTP is LOW
allowing for waveform synthesis and
modulation. ACC1-0 set to ‘00’ is most
commonly used when RTP is HIGH
unless performing backward mapping
from Cartesian to Polar coordinates.
TCXY — Data Input/Output Format
Select
When TCXY is HIGH, two’s comple-
ment format is selected. When TCXY
is LOW, sign-and-magnitude format is
selected.



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